mirror of https://github.com/garrytan/gstack.git
fcbc217fdc
Codex CLI 0.130.0 made [PROMPT] and --base <BRANCH> mutually exclusive at argv level. Step 2A of codex/SKILL.md.tmpl had always passed both (the filesystem boundary prefix as the prompt argument + the base branch), so every /codex review call died with: error: the argument '[PROMPT]' cannot be used with '--base <BRANCH>' Fix: split Step 2A into two paths. Default (no custom user instructions): bare 'codex review --base <base>'. Codex's review prompt is internally diff-scoped, so the model focuses on the changes against base. The filesystem boundary prefix is dropped here because Codex 0.130 has no documented system-prompt config key (probed -c 'system_prompt="..."' against 0.130 — the flag is silently accepted but the value isn't applied). Skill files under .claude/ and agents/ are public, so this is a token-efficiency concern, not a safety one. Custom instructions (/codex review <focus>): route through codex exec with the diff written to a tempfile, inlined into the prompt between explicit DIFF_START / DIFF_END markers. The boundary is preserved here because codex exec isn't auto-scoped to the diff. The DIFF_START/END delimiters tell the model where data ends and instructions resume, which materially reduces prompt-injection hijack rates when the diff contains adversarial content. Note on bash semantics: codex's earlier review flagged the exec route as "command injection via $_DIFF interpolation." That framing is wrong — bash parameter expansion does not re-evaluate $(...) or backticks inside the expanded value, so a diff containing $(rm -rf /) is plain string data to codex exec. The real risk is prompt injection (model-side, not shell-side), which the DIFF_START/END pattern mitigates. Regression tests in test/codex-hardening.test.ts assert across BOTH codex/SKILL.md.tmpl AND the generated codex/SKILL.md: 1. No 'codex review' invocation line combines a quoted-string OR variable positional argument with --base. 2. Step 2A still contains either bare 'codex review --base' OR 'codex exec' (guards against accidental deletion of both fix paths). Fixes #1428. Reported by Stashub. |
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| SKILL.md | ||
| SKILL.md.tmpl | ||