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6.1 KiB
Agent Note: dsh-hook-protocol——Claude Code / Codex 钩子协议格式共享核心库
Status: implemented
English | 中文
问题
钩子子系统提供两个桥接插件:一个运行用户既有的 Claude Code(CC)钩子,另一个运行 Codex 钩子。研究参考实现(~/repos/refs/claude-code、~/repos/refs/codex)后发现一个决定性事实:Codex 有意重新实现了 CC 钩子协议的一个子集。 它的引擎读取相同的 hooks.json,使用相同的 matcher-group 形状、相同的 exit-code/structured-stdout 输出契约,以及相同的命令钩子执行模型。Codex 的源码甚至以 Claude 的引擎命名,并在注释中标注了「有意偏离」之处。因此,如果不做抽取,两个桥接插件将大量重复协议逻辑。
本 Agent Note 引入 @deepseek-ai/dsh-hook-protocol,一个库(不是插件——它不注册也不注入任何东西),持有两个桥接插件共同依赖的真正相同的原语。共享与方言专属之间的分界是本设计的重心。
决策
在 packages/hooks/ 分组下新建 hook-protocol 作为纯库。它负责四类原语和 hook/* 会话事件;每个桥接插件(dsh-hooks-claude、dsh-hooks-codex)拥有真正不同的部分。
共享(本库):
- Matcher —
matcherDiagnostic(pattern, mode)与matchesMatcher(pattern, query, mode)。两种方言的唯一差异收敛到mode参数:claude将纯[A-Za-z0-9_|]+pattern 视为字面量(管道符表示多个精确匹配备选项),其他 pattern 视为正则;codex始终使用未锚定正则。缺省/''/'*'匹配一切。每个桥接插件会在解析 group 前忽略不支持的事件,丢弃受支持但没有 matcher 匹配对象的事件所带字段,校验其余可运行 group;其中任何无效正则都会导致整份配置加载失败,并给出包含方言/pattern/事件的稳定诊断,不会注册任何钩子监听器。运行时匹配仍会将无效正则隔离为不匹配,因此直接调用本库绝不向 agent loop(智能体循环)抛异常。 - 执行 —
runHook(bash, hook, options)。通过ctx.bashseam 而非自建spawn运行命令钩子:执行器已提供清洗但可覆盖的 env、进程组 kill 和超时,正是协议所需的能力;dsh-bash的stdin/env字段(正是为此添加的)是进程内桥接插件被允许使用的受信插件接口。它将桥接插件构建的 payload 序列化到 stdin(仅 CC 时追加尾部换行),遵守钩子的timeoutSec(否则使用DEFAULT_HOOK_TIMEOUT_MS,即两种方言共享的 10 分钟参考默认值),且从不抛异常(执行器拒绝变为 non-blocking-error 的HookOutput)。 - 解码 —
parseHookOutput(exit, stdout, stderr),exit-code + structured-stdout 编解码器,产出方言无关的HookOutput。Exit0→ 宽松 JSON 解析 stdout;exit2→ blocking error,stderr为原因(以decision: 'block'呈现,调用方无需单独处理 exit-code 分支);其他 → non-blocking error。解析 CC structured-stdout 中在某条路径上有消费方的字段(continue/stopReason/decision/hookSpecificOutput.{permissionDecision,additionalContext,updatedInput}/systemMessage);桥接插件只采纳对其方言有意义的子集。在任何路径上都没有消费方的字段不予解析(CC 的suppressOutput——钩子 stdout 在此处从不进入 transcript(文本记录),因此无需抑制;见 收紧钩子协议契约 Agent Note)。 - 合并 —
mergeHookOutputs(outputs),将多个匹配钩子的输出折叠为一个最严格的MergedHookOutcome:权限优先级 deny > ask > allow,halt 在首个continue:false时粘滞,阻止原因以\n\n拼接,context/system-messages 按序累积。 hook/*会话事件 —hook/invoked/hook/result,通过声明合并进入SessionEventMap(仅日志,如compact/*——不是SurfaceEventType),配有appendHookInvoked/appendHookResult辅助函数,确保 invoked/result 配对与由所有者定义的执行关系在各桥接插件间保持一致。appendHookResult还负责定义持久化记录的语义:decision 字符串(钩子解析出的 decision,否则continue:false时为'stop',否则为'pass')和 500 字符的stderrSummary截断均从本库的HookOutput派生,而非各桥接插件各自实现。
方言专属(桥接插件): 构建每个事件的 stdin payload(CC 的 base+per-event 字段集 vs Codex 的 snake_case 加 turn_id/model 额外字段)、方言的 env 与 ${CLAUDE_PLUGIN_ROOT} 替换(CC)vs 无替换(Codex),以及将方言无关的 HookOutput/MergedHookOutcome 映射为 harness seam 专属的类型化 Decision(PreToolDecision、PreStepDecision、ContinuationDecision、PostToolDecision)。
曾考虑的替代方案
单一参数化引擎。 否决,因为 payload 构建与 decision 映射在方言间确实不同。Matcher、编解码器、执行、合并规则和事件保持共享;每个桥接插件保留自己的 payload 和映射,使其协议格式行为在代码中可就地阅读。
后果
每个桥接插件以原子方式解析配置、构建方言 payload、调用共享的 runner 与合并逻辑、映射 decision、追加 hook/*。协议测试覆盖每种 matcher 模式与诊断、exit-code 与编解码器字段、runner 接线、合并优先级和审计辅助函数,逐文件 100% 覆盖率;桥接插件测试验证库的加载路径并锁定精确警告。无密钥 ACP 快照通过真实 Loader/app 路径启动两个桥接插件,在非法 matcher 之前放置一个合法的拦截 group,然后证明请求仍到达 replay 模型且没有持久化任何 hook/* 行,从而避免手工挂载 Context 掩盖部分注册。updatedInput 已解析但仅记录日志并发出警告,直到 input-rewrite 提案落地。