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84466bbb6c
Cycle #34 dogfood follow-through on Jobdori cycle #33 pinpoint (#247 filed at fbcbe9d). Closes the two typed-error contract drifts surfaced in that pinpoint against the Rust `claw` binary. ## What was wrong 1. `classify_error_kind()` (main.rs:~251) used substring matching but did NOT match two common prompt-related parse errors: - "prompt subcommand requires a prompt string" - "empty prompt: provide a subcommand..." Both fell through to `"unknown"`. §4.44 typed-error contract specifies `parse | usage | unknown` as distinct classes, so claws dispatching on `error.kind == "cli_parse"` missed those paths entirely. 2. JSON mode dropped the `Run `claw --help` for usage.` hint. Text mode appends it at stderr-print time (main.rs:~234) AFTER split_error_hint() has already serialized the envelope, so JSON consumers never saw it. Text-mode humans got an actionable pointer; machine consumers did not. ## Fix Two small, targeted edits: 1. `classify_error_kind()`: add explicit branches for "prompt subcommand requires" and "empty prompt:" (the latter anchored with `starts_with` so it never hijacks unrelated error messages containing the word). Both route to `cli_parse`. 2. JSON error render path in `main()`: after calling split_error_hint(), if the message carried no embedded hint AND kind is `cli_parse` AND the short-reason does not already embed a `claw --help` pointer, synthesize the same `Run `claw --help` for usage.` trailer that text-mode stderr appends. The embedded-pointer check prevents duplication on the `empty prompt: ... (run `claw --help`)` message which already carries inline guidance. ## Verification Direct repro on the compiled binary: $ claw --output-format json prompt {"error":"prompt subcommand requires a prompt string", "hint":"Run `claw --help` for usage.", "kind":"cli_parse","type":"error"} $ claw --output-format json "" {"error":"empty prompt: provide a subcommand (run `claw --help`) or a non-empty prompt string", "hint":null,"kind":"cli_parse","type":"error"} $ claw --output-format json doctor --foo # regression guard {"error":"unrecognized argument `--foo` for subcommand `doctor`", "hint":"Run `claw --help` for usage.", "kind":"cli_parse","type":"error"} Text mode unchanged in shape; `[error-kind: ...]` prefix now reads `cli_parse` for the two previously-misclassified paths. ## Regression coverage - Unit test `classify_error_kind_covers_prompt_parse_errors_247`: locks both patterns route to `cli_parse` AND that generic "prompt"-containing messages still fall through to `unknown`. - Integration tests in `tests/output_format_contract.rs`: * prompt_subcommand_without_arg_emits_cli_parse_envelope_with_hint_247 * empty_positional_arg_emits_cli_parse_envelope_247 * whitespace_only_positional_arg_emits_cli_parse_envelope_247 * unrecognized_argument_still_classifies_as_cli_parse_247_regression_guard - Full rusty-claude-cli test suite: 218 tests pass (180 bin unit + 15 output_format_contract + 12 resume_slash + 7 compact + 3 mock + 1 cli). ## Family / related Joins §4.44 typed-envelope contract gap family closure: #130, #179, #181, and now **#247**. All four quartet items now have real fixes landed on the canonical binary surface rather than only the Python harness. ROADMAP.md: #247 marked CLOSED with before/after evidence preserved.