[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Extract people, places, organizations, problems, actions, and outcomes as compact JSON.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Extract people, places, organizations, problems, actions, and outcomes as compact JSON.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Extract people, places, organizations, problems, actions, and outcomes as compact JSON.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Extract people, places, organizations, problems, actions, and outcomes as compact JSON.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Translate the passage into natural Spanish, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Translate the passage into natural Spanish, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Translate the passage into natural Spanish, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Translate the passage into natural Spanish, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Turn the passage into a short FAQ with four questions and direct answers.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Turn the passage into a short FAQ with four questions and direct answers.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Turn the passage into a short FAQ with four questions and direct answers.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Turn the passage into a short FAQ with four questions and direct answers.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Rewrite the passage as a formal memo while preserving every factual detail.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Rewrite the passage as a formal memo while preserving every factual detail.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Rewrite the passage as a formal memo while preserving every factual detail.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Rewrite the passage as a formal memo while preserving every factual detail.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Write a headline, a one-sentence deck, and five search keywords for the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Write a headline, a one-sentence deck, and five search keywords for the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Write a headline, a one-sentence deck, and five search keywords for the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Write a headline, a one-sentence deck, and five search keywords for the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Translate the passage into natural Italian, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Translate the passage into natural Italian, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Translate the passage into natural Italian, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Translate the passage into natural Italian, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Rewrite the passage in plain English for a careful twelve-year-old reader.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Rewrite the passage in plain English for a careful twelve-year-old reader.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Rewrite the passage in plain English for a careful twelve-year-old reader.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Rewrite the passage in plain English for a careful twelve-year-old reader.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Summarize the passage in three concise bullet points.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Summarize the passage in three concise bullet points.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Summarize the passage in three concise bullet points.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Summarize the passage in three concise bullet points.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Identify the tone, intended audience, and two implied assumptions in the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Identify the tone, intended audience, and two implied assumptions in the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Identify the tone, intended audience, and two implied assumptions in the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Identify the tone, intended audience, and two implied assumptions in the passage.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Translate the passage into Simplified Chinese, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Translate the passage into Simplified Chinese, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜></think>


[System] You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.

[User]
Translate the passage into Simplified Chinese, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.

<｜begin▁of▁sentence｜>You are a careful language assistant. Preserve meaning, names, numbers, and causal relationships. Do not invent facts not supported by the text.<｜User｜>Translate the passage into Simplified Chinese, preserving names and concrete details.

Passage:
The wetland boardwalk was raised by only twelve centimeters, but that was enough to keep spring water from covering the planks. Visitors noticed the new railings and benches, not the height. The maintenance crew noticed something else: fewer people stepped off the path, so seedlings returned near the edges. A small engineering change had become a habitat change.<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Read the long tool transcript. Produce a conclusion that distinguishes confirmed facts from inferences, and name the regression test that would make the issue findable in the future.

USER: Please test CUDA on the remote machine, then check whether Metal has the same bug.
ASSISTANT TOOL_CALL bash: ssh 0.180 'cd ds4.c && make clean && make cuda && ./tests/cuda_long_context_smoke'
TOOL_RESULT:
nvcc -O3 --use_fast_math -o ds4-server ...
long_context_smoke: PASS tokens=81920 prefill=412.5s gen=128

ASSISTANT TOOL_CALL read_file: ds4_cuda.c lines 500..680
TOOL_RESULT:
cuda kernel uses kv_row_kind to branch raw/compressed writes; host path checks ctx rows before launch.

USER: Do not assume. Compare with Metal and tell me whether the issue exists there too.
ASSISTANT TOOL_CALL read_file: ds4_metal.m lines 900..1120
TOOL_RESULT:
Metal path stores raw and compressed KV through distinct command encoders and asserts the row range before dispatch.

USER: Summarize the conclusion and what regression test would catch this later.

### ds4_metal.m chunk 2
tatic uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
static NSUInteger g_flash_attn_ring_bytes;
static NSUInteger g_flash_attn_kv_bytes;
static NSUInteger g_compressor_pool_kv_bytes;
static NSUInteger g_compressor_pool_score_bytes;
static NSUInteger g_compressor_pool_score_cont_bytes;
static NSUInteger g_compressor_pool_softmax_bytes;
static NSUInteger g_compressor_pool_product_bytes;
static NSUInteger g_compressor_store_ape_bytes;
static NSUInteger g_compressor_store_score_bytes;
static NSUInteger g_embed_rows_bytes;
static NSUInteger g_router_selection_bytes;
static NSUInteger g_router_weight_sum_bytes;
static NSUInteger g_indexer_head_scores_bytes;
static NSUInteger g_indexer_topk_bytes;
static NSUInteger g_indexed_topk_bytes;
static NSUInteger g_f16_round_scratch_bytes;
static NSUInteger g_raw_store_round_bytes;
static NSUInteger g_moe_gate_scratch_bytes;
static NSUInteger g_moe_down_scratch_bytes;
static NSUInteger g_moe_id_map_bytes;
static NSUInteger g_attn_out_group_ids_bytes;
static int g_initialized;
static int g_quality_mode;

static uint64_t ds4_gpu_system_memory_bytes(void) {
    uint64_t bytes = 0;
    size_t len = sizeof(bytes);
    if (sysctlbyname("hw.memsize", &bytes, &len, NULL, 0) != 0) return 0;
    return len == sizeof(bytes) ? bytes : 0;
}

static void ds4_gpu_print_device_summary(void) {
    const char *name = g_device.name ? [g_device.name UTF8String] : "unknown Metal device";
    uint64_t mem = ds4_gpu_system_memory_bytes();
    if (mem) {
        double gib = (double)mem / 1024.0 / 1024.0 / 1024.0;
        fprintf(stderr, "ds4: Metal device %s, %.2f GiB RAM\n", name, gib);
    } else {
        fprintf(stderr, "ds4: Metal device %s\n", name);
    }
}

#define DS4_METAL_MAX_MODEL_VIEWS 16
#define DS4_METAL_MODEL_MAX_TENSOR_BYTES 704643072ull

typedef struct {
    __strong id<MTLBuffer> buffer;
    const void *model_map;
    uint64_t model_size;
    uint64_t model_offset;
    uint64_t bytes;
} ds4_gpu_model_view;

static ds4_gpu_model_view g_model_views[DS4_METAL_MAX_MODEL_VIEWS];
static uint32_t g_model_view_count;

@interface DS4MetalTensor : NSObject
@property(nonatomic, strong) id<MTLBuffer> buffer;
@property(nonatomic, assign) uint64_t offset;
@property(nonatomic, assign) uint64_t bytes;
@property(nonatomic, assign) uint8_t owner;
@end

@implementation DS4MetalTensor
@end

static DS4MetalTensor *ds4_gpu_tensor_obj(ds4_gpu_tensor *tensor) {
    return (__bridge DS4MetalTensor *)tensor;
}

static const DS4MetalTensor *ds4_gpu_tensor_const_obj(const ds4_gpu_tensor *tensor) {
    return (__bridge const DS4MetalTensor *)tensor;
}

static id<MTLBuffer> ds4_gpu_tensor_buffer(const ds4_gpu_tensor *tensor) {
    if (!tensor) return nil;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return obj.buffer;
}

static NSUInteger ds4_gpu_tensor_offset(const ds4_gpu_tensor *tensor) {
    if (!tensor) return 0;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return (NSUInteger)obj.offset;
}

static id<MTLCommandBuffer> ds4_gpu_command_buffer(int *owned) {
    if (g_batch_cb) {
        *owned = 0;
        return g_batch_cb;
    }
    *owned = 1;
    return [g_queue commandBuffer];
}

### metal/dense.metal chunk 0
// DS4 Metal matvec kernels used by generation.

constant short FC_mul_mv_nsg   [[function_constant(FC_MUL_MV + 0)]];
constant short FC_mul_mv_nxpsg [[function_constant(FC_MUL_MV + 1)]];

struct ds4_metal_args_mul_mv {
    int ne00;
    int ne01;
    int ne02;
    ulong nb00;
    ulong nb01;
    ulong nb02;
    ulong nb03;
    int ne10;
    int ne11;
    int ne12;
    ulong nb10;
    ulong nb11;
    ulong nb12;
    ulong nb13;
    int ne0;
    int ne1;
    int nr0;
    short r2;
    short r3;
};

struct ds4_metal_args_mul_mm {
    int32_t ne00;
    int32_t ne02;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

struct ds4_metal_args_mul_mv_ext {
    int32_t ne00;
    int32_t ne01;
    int32_t ne02;
    uint64_t nb00;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne10;
    int32_t ne11;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

template<short NR0>
static inline void helper_mv_reduce_and_write(
        device float * dst_f32,
        float sumf[NR0],
        const int r0,
        const int ne01,
        ushort tiisg,
        ushort sgitg,
        threadgroup char * shmem) {
    constexpr short NW = N_SIMDWIDTH;

    threadgroup float * shmem_f32[NR0];

    for (short row = 0; row < NR0; ++row) {
        shmem_f32[row] = (threadgroup float *) shmem + NW*row;

        if (sgitg == 0) {
            shmem_f32[row][tiisg] = 0.0f;
        }

        sumf[row] = simd_sum(sumf[row]);
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0; ++row) {
        if (tiisg == 0) {
            shmem_f32[row][sgitg] = sumf[row];
        }
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0 && r0 + row < ne01; ++row) {
        float tot = simd_sum(shmem_f32[row][tiisg]);

        if (tiisg == 0 && sgitg == 0) {
            dst_f32[r0 + row] = tot;
        }
    }
}

template<short NR0, typename args_t>
void kernel_mul_mv_q8_0_f32_impl(
        args_t args,
        device const char * src0,
        device const char * src1,
        device       char * dst,
        threadgroup  char * shmem,
        uint3  tgpig,
        ushort tiisg,
        ushort sgitg) {
    const short NSG = FC_mul_mv_nsg;

    constexpr short NW = N_SIMDWIDTH;
    constexpr short NQ = 8;

    const int nb = args.ne00/QK8_0;

    const int r0 = tgpig.x*NR0;
    const int r1 = tgpig.y;
    const int im = tgpig.z;

    const uint i12 = im%args.ne12;
    const uint i13 = im/args.ne12;

    const uint64_t offset1 = r1*args.nb11 + (i12)*args.nb12 + (i13)*args.nb13;

    device const float * y = (device const float *) (src1 + offset1);

    device const block_q8_0 * ax[NR0];
    FOR_UNROLL (short row = 0; row < NR0; ++row) {
        const uint64_t offset0 = (r0 + row)*args.nb01 + (i12/args.r2)*args.nb02 + (i13/args.r3)*args.nb03;

        ax[row] = (device const block_q8_0 *) ((device char *) src0 + offset0);
    }

    float sumf[NR0] = { 0.f };

    const short ix = tiisg/(NW/NQ);
    const short il = tiisg%(NW/NQ);

    const int ib0 = sgitg*NQ + ix;

    float yl[NQ];

    device const float * yb = y + ib0*QK8_0 + il*NQ;

    for (int ib = ib0; ib < nb; ib += NSG*NQ) {
        for (short i = 0; i < NQ; ++i) {
            yl[i] = yb[i];
        }

        for (short row = 0; row < NR0; row++) {

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Read the long tool transcript. Produce a conclusion that distinguishes confirmed facts from inferences, and name the regression test that would make the issue findable in the future.

USER: Please test CUDA on the remote machine, then check whether Metal has the same bug.
ASSISTANT TOOL_CALL bash: ssh 0.180 'cd ds4.c && make clean && make cuda && ./tests/cuda_long_context_smoke'
TOOL_RESULT:
nvcc -O3 --use_fast_math -o ds4-server ...
long_context_smoke: PASS tokens=81920 prefill=412.5s gen=128

ASSISTANT TOOL_CALL read_file: ds4_cuda.c lines 500..680
TOOL_RESULT:
cuda kernel uses kv_row_kind to branch raw/compressed writes; host path checks ctx rows before launch.

USER: Do not assume. Compare with Metal and tell me whether the issue exists there too.
ASSISTANT TOOL_CALL read_file: ds4_metal.m lines 900..1120
TOOL_RESULT:
Metal path stores raw and compressed KV through distinct command encoders and asserts the row range before dispatch.

USER: Summarize the conclusion and what regression test would catch this later.

### ds4_metal.m chunk 2
tatic uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
static NSUInteger g_flash_attn_ring_bytes;
static NSUInteger g_flash_attn_kv_bytes;
static NSUInteger g_compressor_pool_kv_bytes;
static NSUInteger g_compressor_pool_score_bytes;
static NSUInteger g_compressor_pool_score_cont_bytes;
static NSUInteger g_compressor_pool_softmax_bytes;
static NSUInteger g_compressor_pool_product_bytes;
static NSUInteger g_compressor_store_ape_bytes;
static NSUInteger g_compressor_store_score_bytes;
static NSUInteger g_embed_rows_bytes;
static NSUInteger g_router_selection_bytes;
static NSUInteger g_router_weight_sum_bytes;
static NSUInteger g_indexer_head_scores_bytes;
static NSUInteger g_indexer_topk_bytes;
static NSUInteger g_indexed_topk_bytes;
static NSUInteger g_f16_round_scratch_bytes;
static NSUInteger g_raw_store_round_bytes;
static NSUInteger g_moe_gate_scratch_bytes;
static NSUInteger g_moe_down_scratch_bytes;
static NSUInteger g_moe_id_map_bytes;
static NSUInteger g_attn_out_group_ids_bytes;
static int g_initialized;
static int g_quality_mode;

static uint64_t ds4_gpu_system_memory_bytes(void) {
    uint64_t bytes = 0;
    size_t len = sizeof(bytes);
    if (sysctlbyname("hw.memsize", &bytes, &len, NULL, 0) != 0) return 0;
    return len == sizeof(bytes) ? bytes : 0;
}

static void ds4_gpu_print_device_summary(void) {
    const char *name = g_device.name ? [g_device.name UTF8String] : "unknown Metal device";
    uint64_t mem = ds4_gpu_system_memory_bytes();
    if (mem) {
        double gib = (double)mem / 1024.0 / 1024.0 / 1024.0;
        fprintf(stderr, "ds4: Metal device %s, %.2f GiB RAM\n", name, gib);
    } else {
        fprintf(stderr, "ds4: Metal device %s\n", name);
    }
}

#define DS4_METAL_MAX_MODEL_VIEWS 16
#define DS4_METAL_MODEL_MAX_TENSOR_BYTES 704643072ull

typedef struct {
    __strong id<MTLBuffer> buffer;
    const void *model_map;
    uint64_t model_size;
    uint64_t model_offset;
    uint64_t bytes;
} ds4_gpu_model_view;

static ds4_gpu_model_view g_model_views[DS4_METAL_MAX_MODEL_VIEWS];
static uint32_t g_model_view_count;

@interface DS4MetalTensor : NSObject
@property(nonatomic, strong) id<MTLBuffer> buffer;
@property(nonatomic, assign) uint64_t offset;
@property(nonatomic, assign) uint64_t bytes;
@property(nonatomic, assign) uint8_t owner;
@end

@implementation DS4MetalTensor
@end

static DS4MetalTensor *ds4_gpu_tensor_obj(ds4_gpu_tensor *tensor) {
    return (__bridge DS4MetalTensor *)tensor;
}

static const DS4MetalTensor *ds4_gpu_tensor_const_obj(const ds4_gpu_tensor *tensor) {
    return (__bridge const DS4MetalTensor *)tensor;
}

static id<MTLBuffer> ds4_gpu_tensor_buffer(const ds4_gpu_tensor *tensor) {
    if (!tensor) return nil;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return obj.buffer;
}

static NSUInteger ds4_gpu_tensor_offset(const ds4_gpu_tensor *tensor) {
    if (!tensor) return 0;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return (NSUInteger)obj.offset;
}

static id<MTLCommandBuffer> ds4_gpu_command_buffer(int *owned) {
    if (g_batch_cb) {
        *owned = 0;
        return g_batch_cb;
    }
    *owned = 1;
    return [g_queue commandBuffer];
}

### metal/dense.metal chunk 0
// DS4 Metal matvec kernels used by generation.

constant short FC_mul_mv_nsg   [[function_constant(FC_MUL_MV + 0)]];
constant short FC_mul_mv_nxpsg [[function_constant(FC_MUL_MV + 1)]];

struct ds4_metal_args_mul_mv {
    int ne00;
    int ne01;
    int ne02;
    ulong nb00;
    ulong nb01;
    ulong nb02;
    ulong nb03;
    int ne10;
    int ne11;
    int ne12;
    ulong nb10;
    ulong nb11;
    ulong nb12;
    ulong nb13;
    int ne0;
    int ne1;
    int nr0;
    short r2;
    short r3;
};

struct ds4_metal_args_mul_mm {
    int32_t ne00;
    int32_t ne02;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

struct ds4_metal_args_mul_mv_ext {
    int32_t ne00;
    int32_t ne01;
    int32_t ne02;
    uint64_t nb00;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne10;
    int32_t ne11;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

template<short NR0>
static inline void helper_mv_reduce_and_write(
        device float * dst_f32,
        float sumf[NR0],
        const int r0,
        const int ne01,
        ushort tiisg,
        ushort sgitg,
        threadgroup char * shmem) {
    constexpr short NW = N_SIMDWIDTH;

    threadgroup float * shmem_f32[NR0];

    for (short row = 0; row < NR0; ++row) {
        shmem_f32[row] = (threadgroup float *) shmem + NW*row;

        if (sgitg == 0) {
            shmem_f32[row][tiisg] = 0.0f;
        }

        sumf[row] = simd_sum(sumf[row]);
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0; ++row) {
        if (tiisg == 0) {
            shmem_f32[row][sgitg] = sumf[row];
        }
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0 && r0 + row < ne01; ++row) {
        float tot = simd_sum(shmem_f32[row][tiisg]);

        if (tiisg == 0 && sgitg == 0) {
            dst_f32[r0 + row] = tot;
        }
    }
}

template<short NR0, typename args_t>
void kernel_mul_mv_q8_0_f32_impl(
        args_t args,
        device const char * src0,
        device const char * src1,
        device       char * dst,
        threadgroup  char * shmem,
        uint3  tgpig,
        ushort tiisg,
        ushort sgitg) {
    const short NSG = FC_mul_mv_nsg;

    constexpr short NW = N_SIMDWIDTH;
    constexpr short NQ = 8;

    const int nb = args.ne00/QK8_0;

    const int r0 = tgpig.x*NR0;
    const int r1 = tgpig.y;
    const int im = tgpig.z;

    const uint i12 = im%args.ne12;
    const uint i13 = im/args.ne12;

    const uint64_t offset1 = r1*args.nb11 + (i12)*args.nb12 + (i13)*args.nb13;

    device const float * y = (device const float *) (src1 + offset1);

    device const block_q8_0 * ax[NR0];
    FOR_UNROLL (short row = 0; row < NR0; ++row) {
        const uint64_t offset0 = (r0 + row)*args.nb01 + (i12/args.r2)*args.nb02 + (i13/args.r3)*args.nb03;

        ax[row] = (device const block_q8_0 *) ((device char *) src0 + offset0);
    }

    float sumf[NR0] = { 0.f };

    const short ix = tiisg/(NW/NQ);
    const short il = tiisg%(NW/NQ);

    const int ib0 = sgitg*NQ + ix;

    float yl[NQ];

    device const float * yb = y + ib0*QK8_0 + il*NQ;

    for (int ib = ib0; ib < nb; ib += NSG*NQ) {
        for (short i = 0; i < NQ; ++i) {
            yl[i] = yb[i];
        }

        for (short row = 0; row < NR0; row++) {<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Read the long tool transcript. Produce a conclusion that distinguishes confirmed facts from inferences, and name the regression test that would make the issue findable in the future.

USER: Please test CUDA on the remote machine, then check whether Metal has the same bug.
ASSISTANT TOOL_CALL bash: ssh 0.180 'cd ds4.c && make clean && make cuda && ./tests/cuda_long_context_smoke'
TOOL_RESULT:
nvcc -O3 --use_fast_math -o ds4-server ...
long_context_smoke: PASS tokens=81920 prefill=412.5s gen=128

ASSISTANT TOOL_CALL read_file: ds4_cuda.c lines 500..680
TOOL_RESULT:
cuda kernel uses kv_row_kind to branch raw/compressed writes; host path checks ctx rows before launch.

USER: Do not assume. Compare with Metal and tell me whether the issue exists there too.
ASSISTANT TOOL_CALL read_file: ds4_metal.m lines 900..1120
TOOL_RESULT:
Metal path stores raw and compressed KV through distinct command encoders and asserts the row range before dispatch.

USER: Summarize the conclusion and what regression test would catch this later.

### ds4_metal.m chunk 2
tatic uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
static NSUInteger g_flash_attn_ring_bytes;
static NSUInteger g_flash_attn_kv_bytes;
static NSUInteger g_compressor_pool_kv_bytes;
static NSUInteger g_compressor_pool_score_bytes;
static NSUInteger g_compressor_pool_score_cont_bytes;
static NSUInteger g_compressor_pool_softmax_bytes;
static NSUInteger g_compressor_pool_product_bytes;
static NSUInteger g_compressor_store_ape_bytes;
static NSUInteger g_compressor_store_score_bytes;
static NSUInteger g_embed_rows_bytes;
static NSUInteger g_router_selection_bytes;
static NSUInteger g_router_weight_sum_bytes;
static NSUInteger g_indexer_head_scores_bytes;
static NSUInteger g_indexer_topk_bytes;
static NSUInteger g_indexed_topk_bytes;
static NSUInteger g_f16_round_scratch_bytes;
static NSUInteger g_raw_store_round_bytes;
static NSUInteger g_moe_gate_scratch_bytes;
static NSUInteger g_moe_down_scratch_bytes;
static NSUInteger g_moe_id_map_bytes;
static NSUInteger g_attn_out_group_ids_bytes;
static int g_initialized;
static int g_quality_mode;

static uint64_t ds4_gpu_system_memory_bytes(void) {
    uint64_t bytes = 0;
    size_t len = sizeof(bytes);
    if (sysctlbyname("hw.memsize", &bytes, &len, NULL, 0) != 0) return 0;
    return len == sizeof(bytes) ? bytes : 0;
}

static void ds4_gpu_print_device_summary(void) {
    const char *name = g_device.name ? [g_device.name UTF8String] : "unknown Metal device";
    uint64_t mem = ds4_gpu_system_memory_bytes();
    if (mem) {
        double gib = (double)mem / 1024.0 / 1024.0 / 1024.0;
        fprintf(stderr, "ds4: Metal device %s, %.2f GiB RAM\n", name, gib);
    } else {
        fprintf(stderr, "ds4: Metal device %s\n", name);
    }
}

#define DS4_METAL_MAX_MODEL_VIEWS 16
#define DS4_METAL_MODEL_MAX_TENSOR_BYTES 704643072ull

typedef struct {
    __strong id<MTLBuffer> buffer;
    const void *model_map;
    uint64_t model_size;
    uint64_t model_offset;
    uint64_t bytes;
} ds4_gpu_model_view;

static ds4_gpu_model_view g_model_views[DS4_METAL_MAX_MODEL_VIEWS];
static uint32_t g_model_view_count;

@interface DS4MetalTensor : NSObject
@property(nonatomic, strong) id<MTLBuffer> buffer;
@property(nonatomic, assign) uint64_t offset;
@property(nonatomic, assign) uint64_t bytes;
@property(nonatomic, assign) uint8_t owner;
@end

@implementation DS4MetalTensor
@end

static DS4MetalTensor *ds4_gpu_tensor_obj(ds4_gpu_tensor *tensor) {
    return (__bridge DS4MetalTensor *)tensor;
}

static const DS4MetalTensor *ds4_gpu_tensor_const_obj(const ds4_gpu_tensor *tensor) {
    return (__bridge const DS4MetalTensor *)tensor;
}

static id<MTLBuffer> ds4_gpu_tensor_buffer(const ds4_gpu_tensor *tensor) {
    if (!tensor) return nil;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return obj.buffer;
}

static NSUInteger ds4_gpu_tensor_offset(const ds4_gpu_tensor *tensor) {
    if (!tensor) return 0;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return (NSUInteger)obj.offset;
}

static id<MTLCommandBuffer> ds4_gpu_command_buffer(int *owned) {
    if (g_batch_cb) {
        *owned = 0;
        return g_batch_cb;
    }
    *owned = 1;
    return [g_queue commandBuffer];
}

### metal/dense.metal chunk 0
// DS4 Metal matvec kernels used by generation.

constant short FC_mul_mv_nsg   [[function_constant(FC_MUL_MV + 0)]];
constant short FC_mul_mv_nxpsg [[function_constant(FC_MUL_MV + 1)]];

struct ds4_metal_args_mul_mv {
    int ne00;
    int ne01;
    int ne02;
    ulong nb00;
    ulong nb01;
    ulong nb02;
    ulong nb03;
    int ne10;
    int ne11;
    int ne12;
    ulong nb10;
    ulong nb11;
    ulong nb12;
    ulong nb13;
    int ne0;
    int ne1;
    int nr0;
    short r2;
    short r3;
};

struct ds4_metal_args_mul_mm {
    int32_t ne00;
    int32_t ne02;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

struct ds4_metal_args_mul_mv_ext {
    int32_t ne00;
    int32_t ne01;
    int32_t ne02;
    uint64_t nb00;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne10;
    int32_t ne11;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

template<short NR0>
static inline void helper_mv_reduce_and_write(
        device float * dst_f32,
        float sumf[NR0],
        const int r0,
        const int ne01,
        ushort tiisg,
        ushort sgitg,
        threadgroup char * shmem) {
    constexpr short NW = N_SIMDWIDTH;

    threadgroup float * shmem_f32[NR0];

    for (short row = 0; row < NR0; ++row) {
        shmem_f32[row] = (threadgroup float *) shmem + NW*row;

        if (sgitg == 0) {
            shmem_f32[row][tiisg] = 0.0f;
        }

        sumf[row] = simd_sum(sumf[row]);
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0; ++row) {
        if (tiisg == 0) {
            shmem_f32[row][sgitg] = sumf[row];
        }
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0 && r0 + row < ne01; ++row) {
        float tot = simd_sum(shmem_f32[row][tiisg]);

        if (tiisg == 0 && sgitg == 0) {
            dst_f32[r0 + row] = tot;
        }
    }
}

template<short NR0, typename args_t>
void kernel_mul_mv_q8_0_f32_impl(
        args_t args,
        device const char * src0,
        device const char * src1,
        device       char * dst,
        threadgroup  char * shmem,
        uint3  tgpig,
        ushort tiisg,
        ushort sgitg) {
    const short NSG = FC_mul_mv_nsg;

    constexpr short NW = N_SIMDWIDTH;
    constexpr short NQ = 8;

    const int nb = args.ne00/QK8_0;

    const int r0 = tgpig.x*NR0;
    const int r1 = tgpig.y;
    const int im = tgpig.z;

    const uint i12 = im%args.ne12;
    const uint i13 = im/args.ne12;

    const uint64_t offset1 = r1*args.nb11 + (i12)*args.nb12 + (i13)*args.nb13;

    device const float * y = (device const float *) (src1 + offset1);

    device const block_q8_0 * ax[NR0];
    FOR_UNROLL (short row = 0; row < NR0; ++row) {
        const uint64_t offset0 = (r0 + row)*args.nb01 + (i12/args.r2)*args.nb02 + (i13/args.r3)*args.nb03;

        ax[row] = (device const block_q8_0 *) ((device char *) src0 + offset0);
    }

    float sumf[NR0] = { 0.f };

    const short ix = tiisg/(NW/NQ);
    const short il = tiisg%(NW/NQ);

    const int ib0 = sgitg*NQ + ix;

    float yl[NQ];

    device const float * yb = y + ib0*QK8_0 + il*NQ;

    for (int ib = ib0; ib < nb; ib += NSG*NQ) {
        for (short i = 0; i < NQ; ++i) {
            yl[i] = yb[i];
        }

        for (short row = 0; row < NR0; row++) {

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Read the long tool transcript. Produce a conclusion that distinguishes confirmed facts from inferences, and name the regression test that would make the issue findable in the future.

USER: Please test CUDA on the remote machine, then check whether Metal has the same bug.
ASSISTANT TOOL_CALL bash: ssh 0.180 'cd ds4.c && make clean && make cuda && ./tests/cuda_long_context_smoke'
TOOL_RESULT:
nvcc -O3 --use_fast_math -o ds4-server ...
long_context_smoke: PASS tokens=81920 prefill=412.5s gen=128

ASSISTANT TOOL_CALL read_file: ds4_cuda.c lines 500..680
TOOL_RESULT:
cuda kernel uses kv_row_kind to branch raw/compressed writes; host path checks ctx rows before launch.

USER: Do not assume. Compare with Metal and tell me whether the issue exists there too.
ASSISTANT TOOL_CALL read_file: ds4_metal.m lines 900..1120
TOOL_RESULT:
Metal path stores raw and compressed KV through distinct command encoders and asserts the row range before dispatch.

USER: Summarize the conclusion and what regression test would catch this later.

### ds4_metal.m chunk 2
tatic uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
static NSUInteger g_flash_attn_ring_bytes;
static NSUInteger g_flash_attn_kv_bytes;
static NSUInteger g_compressor_pool_kv_bytes;
static NSUInteger g_compressor_pool_score_bytes;
static NSUInteger g_compressor_pool_score_cont_bytes;
static NSUInteger g_compressor_pool_softmax_bytes;
static NSUInteger g_compressor_pool_product_bytes;
static NSUInteger g_compressor_store_ape_bytes;
static NSUInteger g_compressor_store_score_bytes;
static NSUInteger g_embed_rows_bytes;
static NSUInteger g_router_selection_bytes;
static NSUInteger g_router_weight_sum_bytes;
static NSUInteger g_indexer_head_scores_bytes;
static NSUInteger g_indexer_topk_bytes;
static NSUInteger g_indexed_topk_bytes;
static NSUInteger g_f16_round_scratch_bytes;
static NSUInteger g_raw_store_round_bytes;
static NSUInteger g_moe_gate_scratch_bytes;
static NSUInteger g_moe_down_scratch_bytes;
static NSUInteger g_moe_id_map_bytes;
static NSUInteger g_attn_out_group_ids_bytes;
static int g_initialized;
static int g_quality_mode;

static uint64_t ds4_gpu_system_memory_bytes(void) {
    uint64_t bytes = 0;
    size_t len = sizeof(bytes);
    if (sysctlbyname("hw.memsize", &bytes, &len, NULL, 0) != 0) return 0;
    return len == sizeof(bytes) ? bytes : 0;
}

static void ds4_gpu_print_device_summary(void) {
    const char *name = g_device.name ? [g_device.name UTF8String] : "unknown Metal device";
    uint64_t mem = ds4_gpu_system_memory_bytes();
    if (mem) {
        double gib = (double)mem / 1024.0 / 1024.0 / 1024.0;
        fprintf(stderr, "ds4: Metal device %s, %.2f GiB RAM\n", name, gib);
    } else {
        fprintf(stderr, "ds4: Metal device %s\n", name);
    }
}

#define DS4_METAL_MAX_MODEL_VIEWS 16
#define DS4_METAL_MODEL_MAX_TENSOR_BYTES 704643072ull

typedef struct {
    __strong id<MTLBuffer> buffer;
    const void *model_map;
    uint64_t model_size;
    uint64_t model_offset;
    uint64_t bytes;
} ds4_gpu_model_view;

static ds4_gpu_model_view g_model_views[DS4_METAL_MAX_MODEL_VIEWS];
static uint32_t g_model_view_count;

@interface DS4MetalTensor : NSObject
@property(nonatomic, strong) id<MTLBuffer> buffer;
@property(nonatomic, assign) uint64_t offset;
@property(nonatomic, assign) uint64_t bytes;
@property(nonatomic, assign) uint8_t owner;
@end

@implementation DS4MetalTensor
@end

static DS4MetalTensor *ds4_gpu_tensor_obj(ds4_gpu_tensor *tensor) {
    return (__bridge DS4MetalTensor *)tensor;
}

static const DS4MetalTensor *ds4_gpu_tensor_const_obj(const ds4_gpu_tensor *tensor) {
    return (__bridge const DS4MetalTensor *)tensor;
}

static id<MTLBuffer> ds4_gpu_tensor_buffer(const ds4_gpu_tensor *tensor) {
    if (!tensor) return nil;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return obj.buffer;
}

static NSUInteger ds4_gpu_tensor_offset(const ds4_gpu_tensor *tensor) {
    if (!tensor) return 0;
    const DS4MetalTensor *obj = ds4_gpu_tensor_const_obj(tensor);
    return (NSUInteger)obj.offset;
}

static id<MTLCommandBuffer> ds4_gpu_command_buffer(int *owned) {
    if (g_batch_cb) {
        *owned = 0;
        return g_batch_cb;
    }
    *owned = 1;
    return [g_queue commandBuffer];
}

### metal/dense.metal chunk 0
// DS4 Metal matvec kernels used by generation.

constant short FC_mul_mv_nsg   [[function_constant(FC_MUL_MV + 0)]];
constant short FC_mul_mv_nxpsg [[function_constant(FC_MUL_MV + 1)]];

struct ds4_metal_args_mul_mv {
    int ne00;
    int ne01;
    int ne02;
    ulong nb00;
    ulong nb01;
    ulong nb02;
    ulong nb03;
    int ne10;
    int ne11;
    int ne12;
    ulong nb10;
    ulong nb11;
    ulong nb12;
    ulong nb13;
    int ne0;
    int ne1;
    int nr0;
    short r2;
    short r3;
};

struct ds4_metal_args_mul_mm {
    int32_t ne00;
    int32_t ne02;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

struct ds4_metal_args_mul_mv_ext {
    int32_t ne00;
    int32_t ne01;
    int32_t ne02;
    uint64_t nb00;
    uint64_t nb01;
    uint64_t nb02;
    uint64_t nb03;
    int32_t ne10;
    int32_t ne11;
    int32_t ne12;
    uint64_t nb10;
    uint64_t nb11;
    uint64_t nb12;
    uint64_t nb13;
    int32_t ne0;
    int32_t ne1;
    int16_t r2;
    int16_t r3;
};

template<short NR0>
static inline void helper_mv_reduce_and_write(
        device float * dst_f32,
        float sumf[NR0],
        const int r0,
        const int ne01,
        ushort tiisg,
        ushort sgitg,
        threadgroup char * shmem) {
    constexpr short NW = N_SIMDWIDTH;

    threadgroup float * shmem_f32[NR0];

    for (short row = 0; row < NR0; ++row) {
        shmem_f32[row] = (threadgroup float *) shmem + NW*row;

        if (sgitg == 0) {
            shmem_f32[row][tiisg] = 0.0f;
        }

        sumf[row] = simd_sum(sumf[row]);
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0; ++row) {
        if (tiisg == 0) {
            shmem_f32[row][sgitg] = sumf[row];
        }
    }

    threadgroup_barrier(mem_flags::mem_threadgroup);

    for (short row = 0; row < NR0 && r0 + row < ne01; ++row) {
        float tot = simd_sum(shmem_f32[row][tiisg]);

        if (tiisg == 0 && sgitg == 0) {
            dst_f32[r0 + row] = tot;
        }
    }
}

template<short NR0, typename args_t>
void kernel_mul_mv_q8_0_f32_impl(
        args_t args,
        device const char * src0,
        device const char * src1,
        device       char * dst,
        threadgroup  char * shmem,
        uint3  tgpig,
        ushort tiisg,
        ushort sgitg) {
    const short NSG = FC_mul_mv_nsg;

    constexpr short NW = N_SIMDWIDTH;
    constexpr short NQ = 8;

    const int nb = args.ne00/QK8_0;

    const int r0 = tgpig.x*NR0;
    const int r1 = tgpig.y;
    const int im = tgpig.z;

    const uint i12 = im%args.ne12;
    const uint i13 = im/args.ne12;

    const uint64_t offset1 = r1*args.nb11 + (i12)*args.nb12 + (i13)*args.nb13;

    device const float * y = (device const float *) (src1 + offset1);

    device const block_q8_0 * ax[NR0];
    FOR_UNROLL (short row = 0; row < NR0; ++row) {
        const uint64_t offset0 = (r0 + row)*args.nb01 + (i12/args.r2)*args.nb02 + (i13/args.r3)*args.nb03;

        ax[row] = (device const block_q8_0 *) ((device char *) src0 + offset0);
    }

    float sumf[NR0] = { 0.f };

    const short ix = tiisg/(NW/NQ);
    const short il = tiisg%(NW/NQ);

    const int ib0 = sgitg*NQ + ix;

    float yl[NQ];

    device const float * yb = y + ib0*QK8_0 + il*NQ;

    for (int ib = ib0; ib < nb; ib += NSG*NQ) {
        for (short i = 0; i < NQ; ++i) {
            yl[i] = yb[i];
        }

        for (short row = 0; row < NR0; row++) {<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Read the long agent transcript and trace. Diagnose the likely source of the wasted work and propose the next file/function to inspect first.

USER: The server resumed an old coding session and got slower after a tool call.
ASSISTANT TOOL_CALL bash: rg -n "canonicalization|responses replay|kv cache hit" ds4_server.c
TOOL_RESULT:
ds4_server.c:1646:static void append_tools_prompt_text(buf *b, const char *tool_schemas) {
ds4_server.c:1922:        append_tools_prompt_text(&system, tool_schemas);

ASSISTANT: The first grep hit points to the renderer; I need logs next.
USER: Here is the trace excerpt. Do not change protocol semantics, only avoid useless rebuilds.
TRACE:
0514 00:30:14 ds4-server: chat ctx=12288..13000:712 RESPPROTO TOOLS prefill chunk 0/712 (0.0%) chunk=151.0 t/s avg=149.0 t/s
0514 00:31:14 ds4-server: chat ctx=12545..13257:712 RESPPROTO TOOLS prefill chunk 128/712 (18.0%) chunk=151.1 t/s avg=149.1 t/s
0514 00:32:14 ds4-server: chat ctx=12802..13514:712 RESPPROTO TOOLS prefill chunk 256/712 (36.0%) chunk=151.2 t/s avg=149.2 t/s
0514 00:33:14 ds4-server: chat ctx=13059..13771:712 RESPPROTO TOOLS prefill chunk 384/712 (54.0%) chunk=151.3 t/s avg=149.3 t/s
0514 00:34:14 ds4-server: chat ctx=13316..14028:712 RESPPROTO TOOLS prefill chunk 512/712 (72.0%) chunk=151.4 t/s avg=149.4 t/s
0514 00:35:14 ds4-server: chat ctx=13573..14285:712 RESPPROTO TOOLS prefill chunk 640/712 (90.0%) chunk=151.5 t/s avg=149.5 t/s
0514 00:36:37 ds4-server: tool checkpoint canonicalized ctx=13257..16846:3589 common=16846 live=16994 canonical=16937 via=rebuild
USER: What minimal next patch would you inspect first?

### ds4_server.c chunk 2
_lit(p, "true")) {
        *out = true;
        return true;
    }
    if (json_lit(p, "false")) {
        *out = false;
        return true;
    }
    return false;
}

/* The request parser only understands the API fields we use and skips the
 * rest.  Skipping is recursive because JSON values nest, so keep an explicit
 * ceiling: without it, a useless ignored field like {"x":[[[...]]]} can spend
 * the whole C stack before the request is rejected. */
#define JSON_MAX_NESTING 256

static bool json_skip_value_depth(const char **p, int depth);

static bool json_skip_array_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '[') return false;
    (*p)++;
    json_ws(p);
    if (**p == ']') {
        (*p)++;
        return true;
    }
    for (;;) {
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == ']') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_object_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '{') return false;
    (*p)++;
    json_ws(p);
    if (**p == '}') {
        (*p)++;
        return true;
    }
    for (;;) {
        char *key = NULL;
        if (!json_string(p, &key)) return false;
        free(key);
        json_ws(p);
        if (**p != ':') return false;
        (*p)++;
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == '}') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_value_depth(const char **p, int depth) {
    json_ws(p);
    if (**p == '"') {
        char *s = NULL;
        bool ok = json_string(p, &s);
        free(s);
        return ok;
    }
    if (**p == '{') return json_skip_object_depth(p, depth);
    if (**p == '[') return json_skip_array_depth(p, depth);
    if (json_lit(p, "true") || json_lit(p, "false") || json_lit(p, "null")) return true;
    double v = 0.0;
    return json_number(p, &v);
}

static bool json_skip_value(const char **p) {
    return json_skip_value_depth(p, 0);
}

static bool json_raw_value(const char **p, char **out) {
    json_ws(p);
    const char *start = *p;
    if (!json_skip_value(p)) return false;
    size_t n = (size_t)(*p - start);
    char *s = xmalloc(n + 1);
    memcpy(s, start, n);
    s[n] = '\0';
    *out = s;
    return true;
}

static char *json_minify_raw_value(const char *json) {
    const char *p = json ? json : "null";
    json_ws(&p);
    const char *start = p;
    if (!json_skip_value(&p)) return xstrdup(json ? json : "null");
    const char *end = p;

    buf b = {0};
    bool in_string = false;
    bool escape = false;
    for (const char *s = start; s < end; s++) {
        unsigned char c = (unsigned char)*s;
        if (in_string) {
            buf_putc(&b, (char)c);
            if (escape) escape = false;
            else if (c == '\\') escape = true;
            else if (c == '"') in_string = false;
        } else if (c == '"') {
            in_string = true;
            buf_putc(&b, (char)c);
        } else if (!isspace(c)) {
            buf_putc(&b, (char)c);
        }
    }
    return buf_take(&b);
}

static bool json_content(const char **p, char **out) {
    json_ws(p);
    if (**p == '"') return json_string(p, out);
    if (json_lit(p, "null")) {
        *out = xstrdup("");
        return true;
    }
    if (**p != '[') {

### ds4_server.c chunk 5
calls->v = xrealloc(calls->v, (size_t)calls->cap * sizeof(calls->v[0]));
    }
    calls->v[calls->len++] = tc;
}

static void chat_msg_add_tool_call_id(chat_msg *m, const char *id) {
    if (!m || !id || !id[0]) return;
    if (!m->tool_call_id) m->tool_call_id = xstrdup(id);
    for (int i = 0; i < m->tool_call_ids_len; i++) {
        if (m->tool_call_ids[i] && !strcmp(m->tool_call_ids[i], id)) return;
    }
    if (m->tool_call_ids_len == m->tool_call_ids_cap) {
        m->tool_call_ids_cap = m->tool_call_ids_cap ? m->tool_call_ids_cap * 2 : 2;
        m->tool_call_ids = xrealloc(m->tool_call_ids,
            (size_t)m->tool_call_ids_cap * sizeof(m->tool_call_ids[0]));
    }
    m->tool_call_ids[m->tool_call_ids_len++] = xstrdup(id);
}

static void chat_msg_free(chat_msg *m) {
    free(m->role);
    free(m->content);
    free(m->reasoning);
    free(m->tool_call_id);
    for (int i = 0; i < m->tool_call_ids_len; i++) free(m->tool_call_ids[i]);
    free(m->tool_call_ids);
    tool_calls_free(&m->calls);
    memset(m, 0, sizeof(*m));
}

static void chat_msgs_free(chat_msgs *msgs) {
    for (int i = 0; i < msgs->len; i++) chat_msg_free(&msgs->v[i]);
    free(msgs->v);
    memset(msgs, 0, sizeof(*msgs));
}

static void chat_msgs_push(chat_msgs *msgs, chat_msg msg) {
    if (msgs->len == msgs->cap) {
        msgs->cap = msgs->cap ? msgs->cap * 2 : 8;
        msgs->v = xrealloc(msgs->v, (size_t)msgs->cap * sizeof(msgs->v[0]));
    }
    msgs->v[msgs->len++] = msg;
}

static void tool_schema_order_free(tool_schema_order *o) {
    free(o->name);
    free(o->wire_name);
    free(o->namespace);
    for (int i = 0; i < o->len; i++) free(o->prop[i]);
    free(o->prop);
    memset(o, 0, sizeof(*o));
}

static void tool_schema_orders_free(tool_schema_orders *orders) {
    for (int i = 0; i < orders->len; i++) tool_schema_order_free(&orders->v[i]);
    free(orders->v);
    memset(orders, 0, sizeof(*orders));
}

static void tool_schema_order_prop_push(tool_schema_order *o, char *prop) {
    if (o->len == o->cap) {
        o->cap = o->cap ? o->cap * 2 : 8;
        o->prop = xrealloc(o->prop, (size_t)o->cap * sizeof(o->prop[0]));
    }
    o->prop[o->len++] = prop;
}

static int tool_schema_orders_find_index(const tool_schema_orders *orders, const char *name) {
    if (!orders || !name) return -1;
    for (int i = 0; i < orders->len; i++) {
        if (orders->v[i].name && !strcmp(orders->v[i].name, name)) return i;
    }
    return -1;
}

static void tool_schema_orders_push(tool_schema_orders *orders, tool_schema_order order) {
    int idx = tool_schema_orders_find_index(orders, order.name);
    if (idx >= 0) {
        tool_schema_order_free(&orders->v[idx]);
        orders->v[idx] = order;
        return;
    }
    if (orders->len == orders->cap) {
        orders->cap = orders->cap ? orders->cap * 2 : 8;
        orders->v = xrealloc(orders->v, (size_t)orders->cap * sizeof(orders->v[0]));
    }
    orders->v[orders->len++] = order;
}

static const tool_schema_order *tool_schema_orders_find(const tool_schema_orders *orders, const char *name) {
    int idx = tool_schema_orders_find_index(orders, name);
    return idx >= 0 ? &orders->v[idx] : NULL;
}

static void request_init(request *r, req_kind kind, int max_tokens) {
    memset(r, 0, sizeof(*r));
    r->kind = kind;
    r->api = API_OPENAI;
    r->model = xstrdup("deepseek-v4-flash");
    r->max_tokens = max_tokens;
    r->top_k = 0;
    r->temperature = 1.0f;
    r->top_p = 1.0f;
    r->min_p = 0.0f;
    r->think_mode = DS4_THINK_HIGH;
}

static void request_free(request *r) {

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Read the long agent transcript and trace. Diagnose the likely source of the wasted work and propose the next file/function to inspect first.

USER: The server resumed an old coding session and got slower after a tool call.
ASSISTANT TOOL_CALL bash: rg -n "canonicalization|responses replay|kv cache hit" ds4_server.c
TOOL_RESULT:
ds4_server.c:1646:static void append_tools_prompt_text(buf *b, const char *tool_schemas) {
ds4_server.c:1922:        append_tools_prompt_text(&system, tool_schemas);

ASSISTANT: The first grep hit points to the renderer; I need logs next.
USER: Here is the trace excerpt. Do not change protocol semantics, only avoid useless rebuilds.
TRACE:
0514 00:30:14 ds4-server: chat ctx=12288..13000:712 RESPPROTO TOOLS prefill chunk 0/712 (0.0%) chunk=151.0 t/s avg=149.0 t/s
0514 00:31:14 ds4-server: chat ctx=12545..13257:712 RESPPROTO TOOLS prefill chunk 128/712 (18.0%) chunk=151.1 t/s avg=149.1 t/s
0514 00:32:14 ds4-server: chat ctx=12802..13514:712 RESPPROTO TOOLS prefill chunk 256/712 (36.0%) chunk=151.2 t/s avg=149.2 t/s
0514 00:33:14 ds4-server: chat ctx=13059..13771:712 RESPPROTO TOOLS prefill chunk 384/712 (54.0%) chunk=151.3 t/s avg=149.3 t/s
0514 00:34:14 ds4-server: chat ctx=13316..14028:712 RESPPROTO TOOLS prefill chunk 512/712 (72.0%) chunk=151.4 t/s avg=149.4 t/s
0514 00:35:14 ds4-server: chat ctx=13573..14285:712 RESPPROTO TOOLS prefill chunk 640/712 (90.0%) chunk=151.5 t/s avg=149.5 t/s
0514 00:36:37 ds4-server: tool checkpoint canonicalized ctx=13257..16846:3589 common=16846 live=16994 canonical=16937 via=rebuild
USER: What minimal next patch would you inspect first?

### ds4_server.c chunk 2
_lit(p, "true")) {
        *out = true;
        return true;
    }
    if (json_lit(p, "false")) {
        *out = false;
        return true;
    }
    return false;
}

/* The request parser only understands the API fields we use and skips the
 * rest.  Skipping is recursive because JSON values nest, so keep an explicit
 * ceiling: without it, a useless ignored field like {"x":[[[...]]]} can spend
 * the whole C stack before the request is rejected. */
#define JSON_MAX_NESTING 256

static bool json_skip_value_depth(const char **p, int depth);

static bool json_skip_array_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '[') return false;
    (*p)++;
    json_ws(p);
    if (**p == ']') {
        (*p)++;
        return true;
    }
    for (;;) {
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == ']') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_object_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '{') return false;
    (*p)++;
    json_ws(p);
    if (**p == '}') {
        (*p)++;
        return true;
    }
    for (;;) {
        char *key = NULL;
        if (!json_string(p, &key)) return false;
        free(key);
        json_ws(p);
        if (**p != ':') return false;
        (*p)++;
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == '}') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_value_depth(const char **p, int depth) {
    json_ws(p);
    if (**p == '"') {
        char *s = NULL;
        bool ok = json_string(p, &s);
        free(s);
        return ok;
    }
    if (**p == '{') return json_skip_object_depth(p, depth);
    if (**p == '[') return json_skip_array_depth(p, depth);
    if (json_lit(p, "true") || json_lit(p, "false") || json_lit(p, "null")) return true;
    double v = 0.0;
    return json_number(p, &v);
}

static bool json_skip_value(const char **p) {
    return json_skip_value_depth(p, 0);
}

static bool json_raw_value(const char **p, char **out) {
    json_ws(p);
    const char *start = *p;
    if (!json_skip_value(p)) return false;
    size_t n = (size_t)(*p - start);
    char *s = xmalloc(n + 1);
    memcpy(s, start, n);
    s[n] = '\0';
    *out = s;
    return true;
}

static char *json_minify_raw_value(const char *json) {
    const char *p = json ? json : "null";
    json_ws(&p);
    const char *start = p;
    if (!json_skip_value(&p)) return xstrdup(json ? json : "null");
    const char *end = p;

    buf b = {0};
    bool in_string = false;
    bool escape = false;
    for (const char *s = start; s < end; s++) {
        unsigned char c = (unsigned char)*s;
        if (in_string) {
            buf_putc(&b, (char)c);
            if (escape) escape = false;
            else if (c == '\\') escape = true;
            else if (c == '"') in_string = false;
        } else if (c == '"') {
            in_string = true;
            buf_putc(&b, (char)c);
        } else if (!isspace(c)) {
            buf_putc(&b, (char)c);
        }
    }
    return buf_take(&b);
}

static bool json_content(const char **p, char **out) {
    json_ws(p);
    if (**p == '"') return json_string(p, out);
    if (json_lit(p, "null")) {
        *out = xstrdup("");
        return true;
    }
    if (**p != '[') {

### ds4_server.c chunk 5
calls->v = xrealloc(calls->v, (size_t)calls->cap * sizeof(calls->v[0]));
    }
    calls->v[calls->len++] = tc;
}

static void chat_msg_add_tool_call_id(chat_msg *m, const char *id) {
    if (!m || !id || !id[0]) return;
    if (!m->tool_call_id) m->tool_call_id = xstrdup(id);
    for (int i = 0; i < m->tool_call_ids_len; i++) {
        if (m->tool_call_ids[i] && !strcmp(m->tool_call_ids[i], id)) return;
    }
    if (m->tool_call_ids_len == m->tool_call_ids_cap) {
        m->tool_call_ids_cap = m->tool_call_ids_cap ? m->tool_call_ids_cap * 2 : 2;
        m->tool_call_ids = xrealloc(m->tool_call_ids,
            (size_t)m->tool_call_ids_cap * sizeof(m->tool_call_ids[0]));
    }
    m->tool_call_ids[m->tool_call_ids_len++] = xstrdup(id);
}

static void chat_msg_free(chat_msg *m) {
    free(m->role);
    free(m->content);
    free(m->reasoning);
    free(m->tool_call_id);
    for (int i = 0; i < m->tool_call_ids_len; i++) free(m->tool_call_ids[i]);
    free(m->tool_call_ids);
    tool_calls_free(&m->calls);
    memset(m, 0, sizeof(*m));
}

static void chat_msgs_free(chat_msgs *msgs) {
    for (int i = 0; i < msgs->len; i++) chat_msg_free(&msgs->v[i]);
    free(msgs->v);
    memset(msgs, 0, sizeof(*msgs));
}

static void chat_msgs_push(chat_msgs *msgs, chat_msg msg) {
    if (msgs->len == msgs->cap) {
        msgs->cap = msgs->cap ? msgs->cap * 2 : 8;
        msgs->v = xrealloc(msgs->v, (size_t)msgs->cap * sizeof(msgs->v[0]));
    }
    msgs->v[msgs->len++] = msg;
}

static void tool_schema_order_free(tool_schema_order *o) {
    free(o->name);
    free(o->wire_name);
    free(o->namespace);
    for (int i = 0; i < o->len; i++) free(o->prop[i]);
    free(o->prop);
    memset(o, 0, sizeof(*o));
}

static void tool_schema_orders_free(tool_schema_orders *orders) {
    for (int i = 0; i < orders->len; i++) tool_schema_order_free(&orders->v[i]);
    free(orders->v);
    memset(orders, 0, sizeof(*orders));
}

static void tool_schema_order_prop_push(tool_schema_order *o, char *prop) {
    if (o->len == o->cap) {
        o->cap = o->cap ? o->cap * 2 : 8;
        o->prop = xrealloc(o->prop, (size_t)o->cap * sizeof(o->prop[0]));
    }
    o->prop[o->len++] = prop;
}

static int tool_schema_orders_find_index(const tool_schema_orders *orders, const char *name) {
    if (!orders || !name) return -1;
    for (int i = 0; i < orders->len; i++) {
        if (orders->v[i].name && !strcmp(orders->v[i].name, name)) return i;
    }
    return -1;
}

static void tool_schema_orders_push(tool_schema_orders *orders, tool_schema_order order) {
    int idx = tool_schema_orders_find_index(orders, order.name);
    if (idx >= 0) {
        tool_schema_order_free(&orders->v[idx]);
        orders->v[idx] = order;
        return;
    }
    if (orders->len == orders->cap) {
        orders->cap = orders->cap ? orders->cap * 2 : 8;
        orders->v = xrealloc(orders->v, (size_t)orders->cap * sizeof(orders->v[0]));
    }
    orders->v[orders->len++] = order;
}

static const tool_schema_order *tool_schema_orders_find(const tool_schema_orders *orders, const char *name) {
    int idx = tool_schema_orders_find_index(orders, name);
    return idx >= 0 ? &orders->v[idx] : NULL;
}

static void request_init(request *r, req_kind kind, int max_tokens) {
    memset(r, 0, sizeof(*r));
    r->kind = kind;
    r->api = API_OPENAI;
    r->model = xstrdup("deepseek-v4-flash");
    r->max_tokens = max_tokens;
    r->top_k = 0;
    r->temperature = 1.0f;
    r->top_p = 1.0f;
    r->min_p = 0.0f;
    r->think_mode = DS4_THINK_HIGH;
}

static void request_free(request *r) {<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Read the long agent transcript and trace. Diagnose the likely source of the wasted work and propose the next file/function to inspect first.

USER: The server resumed an old coding session and got slower after a tool call.
ASSISTANT TOOL_CALL bash: rg -n "canonicalization|responses replay|kv cache hit" ds4_server.c
TOOL_RESULT:
ds4_server.c:1646:static void append_tools_prompt_text(buf *b, const char *tool_schemas) {
ds4_server.c:1922:        append_tools_prompt_text(&system, tool_schemas);

ASSISTANT: The first grep hit points to the renderer; I need logs next.
USER: Here is the trace excerpt. Do not change protocol semantics, only avoid useless rebuilds.
TRACE:
0514 00:30:14 ds4-server: chat ctx=12288..13000:712 RESPPROTO TOOLS prefill chunk 0/712 (0.0%) chunk=151.0 t/s avg=149.0 t/s
0514 00:31:14 ds4-server: chat ctx=12545..13257:712 RESPPROTO TOOLS prefill chunk 128/712 (18.0%) chunk=151.1 t/s avg=149.1 t/s
0514 00:32:14 ds4-server: chat ctx=12802..13514:712 RESPPROTO TOOLS prefill chunk 256/712 (36.0%) chunk=151.2 t/s avg=149.2 t/s
0514 00:33:14 ds4-server: chat ctx=13059..13771:712 RESPPROTO TOOLS prefill chunk 384/712 (54.0%) chunk=151.3 t/s avg=149.3 t/s
0514 00:34:14 ds4-server: chat ctx=13316..14028:712 RESPPROTO TOOLS prefill chunk 512/712 (72.0%) chunk=151.4 t/s avg=149.4 t/s
0514 00:35:14 ds4-server: chat ctx=13573..14285:712 RESPPROTO TOOLS prefill chunk 640/712 (90.0%) chunk=151.5 t/s avg=149.5 t/s
0514 00:36:37 ds4-server: tool checkpoint canonicalized ctx=13257..16846:3589 common=16846 live=16994 canonical=16937 via=rebuild
USER: What minimal next patch would you inspect first?

### ds4_server.c chunk 2
_lit(p, "true")) {
        *out = true;
        return true;
    }
    if (json_lit(p, "false")) {
        *out = false;
        return true;
    }
    return false;
}

/* The request parser only understands the API fields we use and skips the
 * rest.  Skipping is recursive because JSON values nest, so keep an explicit
 * ceiling: without it, a useless ignored field like {"x":[[[...]]]} can spend
 * the whole C stack before the request is rejected. */
#define JSON_MAX_NESTING 256

static bool json_skip_value_depth(const char **p, int depth);

static bool json_skip_array_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '[') return false;
    (*p)++;
    json_ws(p);
    if (**p == ']') {
        (*p)++;
        return true;
    }
    for (;;) {
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == ']') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_object_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '{') return false;
    (*p)++;
    json_ws(p);
    if (**p == '}') {
        (*p)++;
        return true;
    }
    for (;;) {
        char *key = NULL;
        if (!json_string(p, &key)) return false;
        free(key);
        json_ws(p);
        if (**p != ':') return false;
        (*p)++;
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == '}') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_value_depth(const char **p, int depth) {
    json_ws(p);
    if (**p == '"') {
        char *s = NULL;
        bool ok = json_string(p, &s);
        free(s);
        return ok;
    }
    if (**p == '{') return json_skip_object_depth(p, depth);
    if (**p == '[') return json_skip_array_depth(p, depth);
    if (json_lit(p, "true") || json_lit(p, "false") || json_lit(p, "null")) return true;
    double v = 0.0;
    return json_number(p, &v);
}

static bool json_skip_value(const char **p) {
    return json_skip_value_depth(p, 0);
}

static bool json_raw_value(const char **p, char **out) {
    json_ws(p);
    const char *start = *p;
    if (!json_skip_value(p)) return false;
    size_t n = (size_t)(*p - start);
    char *s = xmalloc(n + 1);
    memcpy(s, start, n);
    s[n] = '\0';
    *out = s;
    return true;
}

static char *json_minify_raw_value(const char *json) {
    const char *p = json ? json : "null";
    json_ws(&p);
    const char *start = p;
    if (!json_skip_value(&p)) return xstrdup(json ? json : "null");
    const char *end = p;

    buf b = {0};
    bool in_string = false;
    bool escape = false;
    for (const char *s = start; s < end; s++) {
        unsigned char c = (unsigned char)*s;
        if (in_string) {
            buf_putc(&b, (char)c);
            if (escape) escape = false;
            else if (c == '\\') escape = true;
            else if (c == '"') in_string = false;
        } else if (c == '"') {
            in_string = true;
            buf_putc(&b, (char)c);
        } else if (!isspace(c)) {
            buf_putc(&b, (char)c);
        }
    }
    return buf_take(&b);
}

static bool json_content(const char **p, char **out) {
    json_ws(p);
    if (**p == '"') return json_string(p, out);
    if (json_lit(p, "null")) {
        *out = xstrdup("");
        return true;
    }
    if (**p != '[') {

### ds4_server.c chunk 5
calls->v = xrealloc(calls->v, (size_t)calls->cap * sizeof(calls->v[0]));
    }
    calls->v[calls->len++] = tc;
}

static void chat_msg_add_tool_call_id(chat_msg *m, const char *id) {
    if (!m || !id || !id[0]) return;
    if (!m->tool_call_id) m->tool_call_id = xstrdup(id);
    for (int i = 0; i < m->tool_call_ids_len; i++) {
        if (m->tool_call_ids[i] && !strcmp(m->tool_call_ids[i], id)) return;
    }
    if (m->tool_call_ids_len == m->tool_call_ids_cap) {
        m->tool_call_ids_cap = m->tool_call_ids_cap ? m->tool_call_ids_cap * 2 : 2;
        m->tool_call_ids = xrealloc(m->tool_call_ids,
            (size_t)m->tool_call_ids_cap * sizeof(m->tool_call_ids[0]));
    }
    m->tool_call_ids[m->tool_call_ids_len++] = xstrdup(id);
}

static void chat_msg_free(chat_msg *m) {
    free(m->role);
    free(m->content);
    free(m->reasoning);
    free(m->tool_call_id);
    for (int i = 0; i < m->tool_call_ids_len; i++) free(m->tool_call_ids[i]);
    free(m->tool_call_ids);
    tool_calls_free(&m->calls);
    memset(m, 0, sizeof(*m));
}

static void chat_msgs_free(chat_msgs *msgs) {
    for (int i = 0; i < msgs->len; i++) chat_msg_free(&msgs->v[i]);
    free(msgs->v);
    memset(msgs, 0, sizeof(*msgs));
}

static void chat_msgs_push(chat_msgs *msgs, chat_msg msg) {
    if (msgs->len == msgs->cap) {
        msgs->cap = msgs->cap ? msgs->cap * 2 : 8;
        msgs->v = xrealloc(msgs->v, (size_t)msgs->cap * sizeof(msgs->v[0]));
    }
    msgs->v[msgs->len++] = msg;
}

static void tool_schema_order_free(tool_schema_order *o) {
    free(o->name);
    free(o->wire_name);
    free(o->namespace);
    for (int i = 0; i < o->len; i++) free(o->prop[i]);
    free(o->prop);
    memset(o, 0, sizeof(*o));
}

static void tool_schema_orders_free(tool_schema_orders *orders) {
    for (int i = 0; i < orders->len; i++) tool_schema_order_free(&orders->v[i]);
    free(orders->v);
    memset(orders, 0, sizeof(*orders));
}

static void tool_schema_order_prop_push(tool_schema_order *o, char *prop) {
    if (o->len == o->cap) {
        o->cap = o->cap ? o->cap * 2 : 8;
        o->prop = xrealloc(o->prop, (size_t)o->cap * sizeof(o->prop[0]));
    }
    o->prop[o->len++] = prop;
}

static int tool_schema_orders_find_index(const tool_schema_orders *orders, const char *name) {
    if (!orders || !name) return -1;
    for (int i = 0; i < orders->len; i++) {
        if (orders->v[i].name && !strcmp(orders->v[i].name, name)) return i;
    }
    return -1;
}

static void tool_schema_orders_push(tool_schema_orders *orders, tool_schema_order order) {
    int idx = tool_schema_orders_find_index(orders, order.name);
    if (idx >= 0) {
        tool_schema_order_free(&orders->v[idx]);
        orders->v[idx] = order;
        return;
    }
    if (orders->len == orders->cap) {
        orders->cap = orders->cap ? orders->cap * 2 : 8;
        orders->v = xrealloc(orders->v, (size_t)orders->cap * sizeof(orders->v[0]));
    }
    orders->v[orders->len++] = order;
}

static const tool_schema_order *tool_schema_orders_find(const tool_schema_orders *orders, const char *name) {
    int idx = tool_schema_orders_find_index(orders, name);
    return idx >= 0 ? &orders->v[idx] : NULL;
}

static void request_init(request *r, req_kind kind, int max_tokens) {
    memset(r, 0, sizeof(*r));
    r->kind = kind;
    r->api = API_OPENAI;
    r->model = xstrdup("deepseek-v4-flash");
    r->max_tokens = max_tokens;
    r->top_k = 0;
    r->temperature = 1.0f;
    r->top_p = 1.0f;
    r->min_p = 0.0f;
    r->think_mode = DS4_THINK_HIGH;
}

static void request_free(request *r) {

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Read the long agent transcript and trace. Diagnose the likely source of the wasted work and propose the next file/function to inspect first.

USER: The server resumed an old coding session and got slower after a tool call.
ASSISTANT TOOL_CALL bash: rg -n "canonicalization|responses replay|kv cache hit" ds4_server.c
TOOL_RESULT:
ds4_server.c:1646:static void append_tools_prompt_text(buf *b, const char *tool_schemas) {
ds4_server.c:1922:        append_tools_prompt_text(&system, tool_schemas);

ASSISTANT: The first grep hit points to the renderer; I need logs next.
USER: Here is the trace excerpt. Do not change protocol semantics, only avoid useless rebuilds.
TRACE:
0514 00:30:14 ds4-server: chat ctx=12288..13000:712 RESPPROTO TOOLS prefill chunk 0/712 (0.0%) chunk=151.0 t/s avg=149.0 t/s
0514 00:31:14 ds4-server: chat ctx=12545..13257:712 RESPPROTO TOOLS prefill chunk 128/712 (18.0%) chunk=151.1 t/s avg=149.1 t/s
0514 00:32:14 ds4-server: chat ctx=12802..13514:712 RESPPROTO TOOLS prefill chunk 256/712 (36.0%) chunk=151.2 t/s avg=149.2 t/s
0514 00:33:14 ds4-server: chat ctx=13059..13771:712 RESPPROTO TOOLS prefill chunk 384/712 (54.0%) chunk=151.3 t/s avg=149.3 t/s
0514 00:34:14 ds4-server: chat ctx=13316..14028:712 RESPPROTO TOOLS prefill chunk 512/712 (72.0%) chunk=151.4 t/s avg=149.4 t/s
0514 00:35:14 ds4-server: chat ctx=13573..14285:712 RESPPROTO TOOLS prefill chunk 640/712 (90.0%) chunk=151.5 t/s avg=149.5 t/s
0514 00:36:37 ds4-server: tool checkpoint canonicalized ctx=13257..16846:3589 common=16846 live=16994 canonical=16937 via=rebuild
USER: What minimal next patch would you inspect first?

### ds4_server.c chunk 2
_lit(p, "true")) {
        *out = true;
        return true;
    }
    if (json_lit(p, "false")) {
        *out = false;
        return true;
    }
    return false;
}

/* The request parser only understands the API fields we use and skips the
 * rest.  Skipping is recursive because JSON values nest, so keep an explicit
 * ceiling: without it, a useless ignored field like {"x":[[[...]]]} can spend
 * the whole C stack before the request is rejected. */
#define JSON_MAX_NESTING 256

static bool json_skip_value_depth(const char **p, int depth);

static bool json_skip_array_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '[') return false;
    (*p)++;
    json_ws(p);
    if (**p == ']') {
        (*p)++;
        return true;
    }
    for (;;) {
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == ']') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_object_depth(const char **p, int depth) {
    if (depth >= JSON_MAX_NESTING) return false;
    json_ws(p);
    if (**p != '{') return false;
    (*p)++;
    json_ws(p);
    if (**p == '}') {
        (*p)++;
        return true;
    }
    for (;;) {
        char *key = NULL;
        if (!json_string(p, &key)) return false;
        free(key);
        json_ws(p);
        if (**p != ':') return false;
        (*p)++;
        if (!json_skip_value_depth(p, depth + 1)) return false;
        json_ws(p);
        if (**p == '}') {
            (*p)++;
            return true;
        }
        if (**p != ',') return false;
        (*p)++;
    }
}

static bool json_skip_value_depth(const char **p, int depth) {
    json_ws(p);
    if (**p == '"') {
        char *s = NULL;
        bool ok = json_string(p, &s);
        free(s);
        return ok;
    }
    if (**p == '{') return json_skip_object_depth(p, depth);
    if (**p == '[') return json_skip_array_depth(p, depth);
    if (json_lit(p, "true") || json_lit(p, "false") || json_lit(p, "null")) return true;
    double v = 0.0;
    return json_number(p, &v);
}

static bool json_skip_value(const char **p) {
    return json_skip_value_depth(p, 0);
}

static bool json_raw_value(const char **p, char **out) {
    json_ws(p);
    const char *start = *p;
    if (!json_skip_value(p)) return false;
    size_t n = (size_t)(*p - start);
    char *s = xmalloc(n + 1);
    memcpy(s, start, n);
    s[n] = '\0';
    *out = s;
    return true;
}

static char *json_minify_raw_value(const char *json) {
    const char *p = json ? json : "null";
    json_ws(&p);
    const char *start = p;
    if (!json_skip_value(&p)) return xstrdup(json ? json : "null");
    const char *end = p;

    buf b = {0};
    bool in_string = false;
    bool escape = false;
    for (const char *s = start; s < end; s++) {
        unsigned char c = (unsigned char)*s;
        if (in_string) {
            buf_putc(&b, (char)c);
            if (escape) escape = false;
            else if (c == '\\') escape = true;
            else if (c == '"') in_string = false;
        } else if (c == '"') {
            in_string = true;
            buf_putc(&b, (char)c);
        } else if (!isspace(c)) {
            buf_putc(&b, (char)c);
        }
    }
    return buf_take(&b);
}

static bool json_content(const char **p, char **out) {
    json_ws(p);
    if (**p == '"') return json_string(p, out);
    if (json_lit(p, "null")) {
        *out = xstrdup("");
        return true;
    }
    if (**p != '[') {

### ds4_server.c chunk 5
calls->v = xrealloc(calls->v, (size_t)calls->cap * sizeof(calls->v[0]));
    }
    calls->v[calls->len++] = tc;
}

static void chat_msg_add_tool_call_id(chat_msg *m, const char *id) {
    if (!m || !id || !id[0]) return;
    if (!m->tool_call_id) m->tool_call_id = xstrdup(id);
    for (int i = 0; i < m->tool_call_ids_len; i++) {
        if (m->tool_call_ids[i] && !strcmp(m->tool_call_ids[i], id)) return;
    }
    if (m->tool_call_ids_len == m->tool_call_ids_cap) {
        m->tool_call_ids_cap = m->tool_call_ids_cap ? m->tool_call_ids_cap * 2 : 2;
        m->tool_call_ids = xrealloc(m->tool_call_ids,
            (size_t)m->tool_call_ids_cap * sizeof(m->tool_call_ids[0]));
    }
    m->tool_call_ids[m->tool_call_ids_len++] = xstrdup(id);
}

static void chat_msg_free(chat_msg *m) {
    free(m->role);
    free(m->content);
    free(m->reasoning);
    free(m->tool_call_id);
    for (int i = 0; i < m->tool_call_ids_len; i++) free(m->tool_call_ids[i]);
    free(m->tool_call_ids);
    tool_calls_free(&m->calls);
    memset(m, 0, sizeof(*m));
}

static void chat_msgs_free(chat_msgs *msgs) {
    for (int i = 0; i < msgs->len; i++) chat_msg_free(&msgs->v[i]);
    free(msgs->v);
    memset(msgs, 0, sizeof(*msgs));
}

static void chat_msgs_push(chat_msgs *msgs, chat_msg msg) {
    if (msgs->len == msgs->cap) {
        msgs->cap = msgs->cap ? msgs->cap * 2 : 8;
        msgs->v = xrealloc(msgs->v, (size_t)msgs->cap * sizeof(msgs->v[0]));
    }
    msgs->v[msgs->len++] = msg;
}

static void tool_schema_order_free(tool_schema_order *o) {
    free(o->name);
    free(o->wire_name);
    free(o->namespace);
    for (int i = 0; i < o->len; i++) free(o->prop[i]);
    free(o->prop);
    memset(o, 0, sizeof(*o));
}

static void tool_schema_orders_free(tool_schema_orders *orders) {
    for (int i = 0; i < orders->len; i++) tool_schema_order_free(&orders->v[i]);
    free(orders->v);
    memset(orders, 0, sizeof(*orders));
}

static void tool_schema_order_prop_push(tool_schema_order *o, char *prop) {
    if (o->len == o->cap) {
        o->cap = o->cap ? o->cap * 2 : 8;
        o->prop = xrealloc(o->prop, (size_t)o->cap * sizeof(o->prop[0]));
    }
    o->prop[o->len++] = prop;
}

static int tool_schema_orders_find_index(const tool_schema_orders *orders, const char *name) {
    if (!orders || !name) return -1;
    for (int i = 0; i < orders->len; i++) {
        if (orders->v[i].name && !strcmp(orders->v[i].name, name)) return i;
    }
    return -1;
}

static void tool_schema_orders_push(tool_schema_orders *orders, tool_schema_order order) {
    int idx = tool_schema_orders_find_index(orders, order.name);
    if (idx >= 0) {
        tool_schema_order_free(&orders->v[idx]);
        orders->v[idx] = order;
        return;
    }
    if (orders->len == orders->cap) {
        orders->cap = orders->cap ? orders->cap * 2 : 8;
        orders->v = xrealloc(orders->v, (size_t)orders->cap * sizeof(orders->v[0]));
    }
    orders->v[orders->len++] = order;
}

static const tool_schema_order *tool_schema_orders_find(const tool_schema_orders *orders, const char *name) {
    int idx = tool_schema_orders_find_index(orders, name);
    return idx >= 0 ? &orders->v[idx] : NULL;
}

static void request_init(request *r, req_kind kind, int max_tokens) {
    memset(r, 0, sizeof(*r));
    r->kind = kind;
    r->api = API_OPENAI;
    r->model = xstrdup("deepseek-v4-flash");
    r->max_tokens = max_tokens;
    r->top_k = 0;
    r->temperature = 1.0f;
    r->top_p = 1.0f;
    r->min_p = 0.0f;
    r->think_mode = DS4_THINK_HIGH;
}

static void request_free(request *r) {<｜Assistant｜><think>