# crabmate_tool 信封金样：每行 `描述<TAB>期望 JSON 单行`（与 normalize 层 round-trip 一致）
# 运行 `cargo test tool_result_envelope_golden` 校验。
v1 最小成功 {"crabmate_tool":{"v":1,"name":"read_file","summary":"读：a.rs","ok":true,"output":"content"}}
v1 压缩元数据 {"crabmate_tool":{"v":1,"name":"run_command","summary":"grep","ok":true,"output":"x","output_truncated":true,"output_original_chars":9999,"output_kept_head_chars":40,"output_kept_tail_chars":40}}
v1 失败可重试 {"crabmate_tool":{"v":1,"name":"run_command","summary":"s","ok":false,"output":"错误：超时\n","error_code":"timeout","failure_category":"timeout","retryable":true}}
v1 并行批 {"crabmate_tool":{"v":1,"name":"read_file","summary":"s","ok":true,"output":"退出码：0\n","exit_code":0,"tool_call_id":"c1","execution_mode":"parallel_readonly_batch","parallel_batch_id":"pb-2"}}