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docs: record prompt missing-text JSON stderr routing gap (#823)

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YeonGyu-Kim 2026-05-29 11:31:28 +09:00
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@ -7856,3 +7856,9 @@ Original filing (2026-04-18): the session emitted `SessionStart hook (completed)
**Required fix shape.** Before falling through to the REPL/prompt path, check whether the first positional arg matches any known subcommand. If not, return a typed error: `{"error_kind":"command_not_found","message":"unknown command: foobar","hint":"Run `claw --help` for available commands.","status":"error"}` on stdout (JSON mode, rc=1) or stderr (text mode). This mirrors the behavior of `--bogus-flag` (which correctly returns `cli_parse`) but for unknown positional commands. **Required fix shape.** Before falling through to the REPL/prompt path, check whether the first positional arg matches any known subcommand. If not, return a typed error: `{"error_kind":"command_not_found","message":"unknown command: foobar","hint":"Run `claw --help` for available commands.","status":"error"}` on stdout (JSON mode, rc=1) or stderr (text mode). This mirrors the behavior of `--bogus-flag` (which correctly returns `cli_parse`) but for unknown positional commands.
**Acceptance.** `claw --output-format json foobar` exits 1, stdout contains JSON with `error_kind:"command_not_found"`, stderr empty. Text mode prints the error to stderr. No provider startup attempted. [SCOPE: claw-code] **Acceptance.** `claw --output-format json foobar` exits 1, stdout contains JSON with `error_kind:"command_not_found"`, stderr empty. Text mode prints the error to stderr. No provider startup attempted. [SCOPE: claw-code]
823. **`claw --output-format json prompt` with missing/empty prompt text routes JSON error to stderr (stdout empty)** — dogfooded 2026-05-29 11:30 on `main` `3a76c4f4`. `claw --output-format json prompt` (no text) and `claw --output-format json prompt ""` (empty string) both exit rc=1, stdout empty, and write `{"error_kind":"missing_prompt","action":"abort",...}` to stderr. The envelope is well-formed but channel-inconsistent: JSON mode machine consumers reading stdout for command results get empty stdout and must check stderr to detect the error. This is the same class as #819 (export session-not-found) and #820 (interactive_only / session subcommands), and the same root cause: the top-level abort handler writes to stderr regardless of output-format mode.
**Required fix shape.** In JSON mode, route `missing_prompt` abort errors to stdout (rc=1) and keep stderr empty. This is the same fix pattern as #817/#819/#820: detect JSON output mode in the abort handler and redirect the structured envelope to stdout. Add regression coverage for `claw --output-format json prompt` (no arg) and `claw --output-format json prompt ""` asserting rc=1, stdout parseable JSON with `error_kind:"missing_prompt"`, stderr empty.
**Acceptance.** Both invocations exit 1 with JSON envelope on stdout and empty stderr. Text mode still prints to stderr. [SCOPE: claw-code]