Function hook

packages/opencode-atomic-hooks/src/index.ts:87–114

(
    sessionID: string,
    verb: string,
    extra: Record<string, unknown> = {},
  )

  };

  const hook = async (
    sessionID: string,
    verb: string,
    extra: Record<string, unknown> = {},
  ) => {
    const payload = JSON.stringify({
      session_id: sessionID,
      cwd: directory,
      timestamp: new Date().toISOString(),
      ...extra,
    });
    try {
      const result =
        await $`echo ${payload} | ${ATOMIC} agent hooks opencode ${verb}`
          .cwd(directory)
          .quiet()
          .nothrow();
      const ok = result.exitCode === 0;
      const stderr = result.stderr.toString().trim();
      log(
        `${verb} session=${sessionID} exit=${result.exitCode}${stderr ? " stderr=" + stderr : ""}`,
      );
      return ok;
    } catch (err) {
      log(`${verb} session=${sessionID} error=${err}`);
      return false;
    }
  };

  // Per-session state within this process lifetime
  const sessions = new Map<