fix: observe complete guidance JSON and literal field words - #473
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📝 WalkthroughWalkthroughThe Go observer adds a bounded stdin mode that normalizes adjacent literal shell fragments without evaluating them. The guard uses the observer for field extraction and checks JSON for incomplete input and duplicate decoded keys. Regression tests cover duplicate keys and shell-field quoting. Priority: ⬇️ Low Severity of issue fixed: Low Merge Risk: 🟡 Moderate · up to The new shell-field handling can still miss a prohibited field written with a backslash escape inside the word. It can also accept an unclosed quote at the end of a field list. Either case can let invalid guidance pass the guard, so these boundaries should be fixed before merge. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change tightens guidance validation without executing inspected content. No introduced or worsened security issue was established, but the check does not understand arbitrary shell behavior, and compatibility across all calling environments remains unverified. Retained concerns Security review detailsSecurity Blast Radius
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Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (2 errors)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation [ Resolution Update Full details: Docstring CoverageExplanation Docstring coverage is 71.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 3 files. (1 skipped: 1 unsupported.)
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Inline comments:
Review comments at @scripts/gh-json-go/main.go:
- Around line 225-230: Update the closing <code>closing < 0</code> branch to
distinguish a surrounding prose quote from an unmatched quote within the JSON
field word; return an error for an incomplete field quote, including at the end
of the input, instead of accepting it and allowing extraction to report a clean
scan.
- Around line 221-223: Update the shell-token normalizer at the character check
that stops scanning on backslashes and backticks: decode literal escapes that
continue a field word, or return UNKNOWN when shell syntax such as unquoted
command substitution prevents reliable extraction. Ensure the later field
extraction cannot treat a partial field list as a clean scan.
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AGENTS.mdscripts/gh-json-go/main.goscripts/guard-gh-json-fields.shscripts/guard-gh-json-fields.test.sh
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Source excerpt: The consuming repository's canonical `AGENTS.md` must define five named sections.
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AGENTS.md
Exact-head validation and user-path evaluationValidated The user path is the published guard itself: it now refuses incomplete shell syntax without evaluating inspected content, while valid Markdown fences and all current plugin guidance remain accepted. Both review threads are resolved on this exact head; hosted CI remains mandatory before promotion. |
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[P2] A substitution at the start of a JSON field still produces a false clean scan at e34e7ca. The word.Len()==0 branch in scripts/gh-json-go/main.go:225 treats a leading backtick as a Markdown boundary. The copied actual guard and decoder return exit 0/CLEAN for both plain guidance and a fenced Bash block containing:
gh pr view --json `printf merged`The scanned command was never executed. Valid inline/fenced state,mergedAt controls remain clean, and the previous in-word substitution fixes work. The successor e34e7ca changes only the run function comment; this failing branch is unchanged from the independently evaluated 9924b5c.
The leading substitution must return UNKNOWN. Please include a leading-substitution negative alongside the existing in-word cases before merging. I have preserved a local repair separately and am not pushing over the active writer's branch.
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Self-review (fallback — CodeRabbit, Codex and Cursor Bugbot unavailable)
Reviewed commit: e34e7ca
- CodeRabbit: the exact-head refresh was requested after resolving both findings; the account-wide rate-limit refusal was observed at 2026-10-04T17:13:45Z on #473 (comment) and resets in 28 minutes.
- Codex: the account-wide usage-limit refusal was observed at 2026-10-04T02:11:02Z on devantler-tech/ksail#7433 (comment) and requires account credits or settings recovery.
- Cursor Bugbot: the user/team usage-limit refusal was observed at 2026-10-04T12:21:20Z on devantler-tech/ksail#7481 (comment) and requires usage or spend recovery.
- Direct current-PR review objects, comments, threads, and Bugbot checks were read before this fallback; the two CodeRabbit findings were reproduced, repaired with four end-to-end regressions, replied to, and resolved. No provider finding is being discarded.
- The complete diff was reviewed for fail-closed shell/JSON observation, bounded input, non-execution of inspected content, valid Markdown boundaries, test coverage, and documentation consistency. The final comment-only commit restores the displaced
runcontract and changes no behavior.
Verdict: no P0/P1 findings
The new current-head P2 finding remains unresolved at e34e7ca. It is a separate leading-substitution case beyond the two repaired CodeRabbit threads. A later fallback's “no P0/P1” verdict does not clear this P2: the actual guard still reports CLEAN for a JSON field supplied entirely by backticks. Please keep this PR draft until the leading-substitution negative returns UNKNOWN and the resulting head is validated and reviewed. |
The exact-head review finding is repaired at RED reproduced the gap: the end-to-end guard suite reported 102 passed / 1 failed because a leading backtick substitution after GREEN evidence:
Current-head hosted CI and review remain required before promotion. |
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[P2] The leading-substitution repair is incomplete at ca8aee9. The normalizer is unchanged by the merge from the independently evaluated 50cef23. The single-backtick case is now UNKNOWN, but scripts/gh-json-go/main.go:225 treats every leading triple backtick as a Markdown boundary. The copied actual guard and decoder still return exit 0/CLEAN for this field word, both plain and inside a fenced Bash example:
gh pr view --json ```printf merged```
That word can contain shell substitutions; it is not a standalone Markdown closing fence. The scanned text was never executed. A real standalone closing fence after gh status --json, as well as valid inline/fenced state,mergedAt controls, stays clean.
Restrict the exception to a standalone fence line and add the triple-backtick field-word negative. This is the remaining case in the previously reported substitution finding; please resolve it before promotion. The original local repair remains preserved separately, and I am not writing over the active branch.
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Self-review (fallback — CodeRabbit, Codex and Cursor Bugbot unavailable)
Reviewed commit: 50cef23
- CodeRabbit: the exact-head refresh before this fix was refused by the account-wide included-review limit at 2026-10-04T17:13:45Z on #473 (comment) and remains inside its stated 28-minute reset window.
- Codex: the account-wide usage-limit refusal was observed at 2026-10-04T02:11:02Z on devantler-tech/ksail#7433 (comment) and requires account credits or settings recovery.
- Cursor Bugbot: the user/team usage-limit refusal was observed at 2026-10-04T12:21:20Z on devantler-tech/ksail#7481 (comment) and requires usage or spend recovery.
- Direct current-PR reviews, comments, threads, and checks were read before this fallback. The exact-head P2 from the preceding review was reproduced RED and repaired; the earlier two CodeRabbit threads remain resolved, and no provider finding is being discarded.
- The complete diff was reviewed for fail-closed shell/JSON observation, bounded input, non-execution of inspected content, Markdown delimiter handling, test coverage, and documentation consistency.
- Exact-head validation passed 104 end-to-end cases, the real shipped-tree scan over 33 JSON lists and 162 surfaces, Go decoder tests, ShellCheck, and diff-check. The paired regression preserves a closing triple-backtick fence while rejecting a leading single-backtick substitution.
Verdict: no P0/P1 findings
The current-head triple-backtick finding is repaired at RED reproduced the remaining false clean: 104 cases passed and the inline triple-backtick field substitution failed because it returned CLEAN. The Markdown exception now requires a real line break and whitespace-only separator before the triple-backtick fence; inline single or triple backticks fail closed as unresolved shell substitution. GREEN evidence:
Current-head hosted CI remains required before promotion. |
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Self-review (fallback — CodeRabbit, Codex and Cursor Bugbot unavailable)
Reviewed commit: d655b47
- CodeRabbit: the exact-head refresh was refused by the account-wide included-review limit at 2026-10-04T17:13:45Z on #473 (comment), inside its stated 28-minute reset window when this review began.
- Codex: the account-wide usage-limit refusal was observed at 2026-10-04T02:11:02Z on devantler-tech/ksail#7433 (comment) and requires account credits or settings recovery.
- Cursor Bugbot: the user/team usage-limit refusal was observed at 2026-10-04T12:21:20Z on devantler-tech/ksail#7481 (comment) and requires usage or spend recovery.
- Direct current-PR reviews, comments, threads, and checks were read before this fallback. Both exact-head P2 reports were reproduced RED and repaired; the two CodeRabbit threads remain resolved, and no provider finding is being discarded.
- The complete diff was reviewed for fail-closed shell/JSON observation, bounded input, non-execution of inspected content, inline versus line-bounded Markdown delimiter handling, test coverage, and documentation consistency.
- Exact-head validation passed 105 end-to-end cases, the real shipped-tree scan over 33 JSON lists and 162 surfaces, Go decoder tests, ShellCheck, and diff-check.
Verdict: no P0/P1 findings
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[P2] Valid double-backtick Markdown guidance now returns UNKNOWN at d655b47. The previously reported single/triple substitution, escape and unmatched-quote negatives are repaired; all 105 guard cases and Go tests pass. However, counting individual backticks in scripts/gh-json-go/main.go:232 treats a two-character opening Markdown delimiter as outside Markdown. The actual guard rejects this valid control:
Use ``gh pr view --json state,mergedAt``.The baseline guard accepts the same fixture. Match delimiter runs for surrounding Markdown spans rather than using character parity, while preserving all substitution negatives. This is a compatibility regression for ordinary literal guidance, not a request to evaluate shell text. Evidence was produced with copied current-head guard/decoder source; inspected guidance was never executed.
Exact-head readiness at |
The double-backtick Markdown compatibility finding is tracked in #476 and repaired by draft #477. Its actual CLI regressions reproduced three failures before the repair and now pass all 111 cases. The follow-up retains UNKNOWN for unresolved shell expressions and mismatched delimiters; merge and main verification are still pending. |
The Markdown compatibility finding in review 5407400750 is resolved by merged PR #477, commit c440fb3, which closes #476. Fresh fetched |
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Why
Bundled guidance could pass validation after repeated JSON keys erased a prescription, or after adjacent shell quotes split the invalid
mergedfield. That could ship instructions whose GitHub reads fail when users confirm delivery.What
Observe one complete JSON value with unique decoded keys and join adjacent literal field fragments without evaluating the inspected text. Unresolved expansions remain UNKNOWN. Document the installed Go observer requirement and keep ordinary valid fields passing.
Validation: 98 guidance regressions, Go observer tests, the actual repository scan, full CI ShellCheck script inventory, manifests, desired-state digests and release gates pass. Inspected packages are never executed.
Fixes #463
Fixes #464