Feed repo conventions (AGENTS.md/CLAUDE.md) to the review engine by ZhenghuaBao · Pull Request #5 · Continuum-AI-Corp/orca-code-review

ZhenghuaBao · 2026-07-17T07:43:04Z

Orca-Code-Review — push 3

Severity	Count	Δ vs previous push
P0	0	0
P1	0	0
P2	0	-2
P3	1	+1

Tier: STRONG (final pass) — pass

✅ no blocking findings

Summary

The review engine now reads the repo's own AGENTS.md/CLAUDE.md/CONTRIBUTING.md to learn project-specific conventions, so it stops flagging deliberate project choices as findings (a precision win toward the Codex bar).
Implemented as a short directive appended to --background (additive — the built-in language/security review and our severity contract are untouched). The conventions doc itself is never inlined into --background; the agent reads it via its file tools, so there's no cap pressure.
Security-gated to same-repo PRs only. On a fork PR the head-checked-out conventions doc is attacker-controlled, so the directive (which instructs the engine to trust that file) is skipped. Gating is driven by a new same_repo output on the pr step (head vs. base repo identity; a deleted-fork null head.repo counts as not-same-repo).
Defensive framing in the directive: the doc is untrusted reference data that may only suppress style findings — it can never weaken correctness/security review, raise/lower severity, or alter the [P0]/[P1]/[P2]/[P3] tags the whole pipeline greps.

Changes

action.yml: pr step emits same_repo; review step appends the directive to --background only when SAME_REPO == true.
rules/conventions-directive.md: the directive text (new).
scripts/conventions-directive.test.mjs: pins the fork-injection gate and the defensive framing so a refactor can't silently drop them.

Test plan

node --test scripts/conventions-directive.test.mjs — 3/3 pass (same_repo derivation, SAME_REPO gate on the concat, untrusted/severity-preserving framing).
action.yml parses as valid YAML.
End-to-end on a real same-repo PR: confirm the engine reads AGENTS.md and suppresses a known convention-driven false positive.
Confirm a fork PR does NOT get the directive.

🤖 Generated with Claude Code

…he engine Point the review engine at the repo's own AGENTS.md/CLAUDE.md/CONTRIBUTING.md so it stops flagging deliberate project choices as issues. The directive rides --background and is gated to same-repo PRs only: a fork's head-checked-out conventions doc is attacker-controlled, so the directive (which tells the engine to trust that file) must never apply to forks. Framed defensively — the doc is untrusted reference data that may only suppress style findings and can never weaken correctness/security review or alter severity tagging. Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

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Reviewed commit: b0325ee83a

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chatgpt-codex-connector · 2026-07-17T07:45:52Z

+        # conventions doc is attacker-controlled, and the directive tells the
+        # engine to trust that file. Rides --background (well under the engine's
+        # cap; the directive is short and never inlines the conventions doc).
+        if [ "$SAME_REPO" = "true" ] && [ -s "$CONVENTIONS_DIRECTIVE" ]; then


Do not trust convention files from same-repo PR heads

When contributors can push feature branches in the base repository but still need PR approval, same_repo is true even though the PR can add or modify its root AGENTS.md/CLAUDE.md. The action checks out that unreviewed head SHA (action.yml:417) before the engine follows this directive, so such a PR can inject instructions into the model context to suppress correctness or security findings; describing the file as “untrusted data” in another prompt does not prevent the model from interpreting its contents as instructions. Restrict convention lookup to the protected base revision, or do not load PR-head convention files at all.

Useful? React with 👍 / 👎.

Fixed in 8f80f0d. The PR-head read was removed in fbc8f00 (conventions now come from the base revision), and 8f80f0d further gates the load on the base being the repo's default branch — so an author-chosen base branch can no longer inject conventions. This addresses both this and the follow-up P1.

The conventions directive pointed the engine at the PR head's AGENTS.md/CLAUDE.md, which a fork PR author controls (Codex P1). Extract the doc ourselves from the trusted base revision via `git show "$BASE:<path>"` and inline it into the background, dropping the same_repo gate (base is trusted regardless of fork). Switch the invocation to --background-file so a large doc can't hit the argv limit. Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

…nd-file) The pinned engine 1.3.13 errors on --background-file (that flag only exists in newer versions). Pass the assembled background file inline via --background "$(cat …)", which 1.3.13 supports; the base-revision conventions extraction is unchanged. Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

github-actions

🐳 Orca-Code-Review

Found 2 issues in this PR: 🟡 2 P2.

_{Reviewed via OrcaRouter — Route Smarter. Ship Safer. Spend Less.}

github-actions · 2026-07-17T09:21:35Z

+                printf '\n\n----- BEGIN %s (untrusted project conventions; read-only reference) -----\n' "$f"
+                printf '%s\n' "$doc"
+                printf -- '----- END %s -----\n' "$f"
+              } >> "$BACKGROUND"


🟡 P2 If a base-revision conventions file is unusually large, this appends it unbounded into BACKGROUND, which is later expanded inline via --background "$(cat "$BACKGROUND")"; that can exceed the OS argv limit and fail the action before review results are produced. Cap or truncate the appended conventions content to a safe size before inlining.

github-actions · 2026-07-17T09:21:35Z

+    // after the untrusted-data framing.
+    assert.match(yml, /--background "\$\(cat "\$BACKGROUND"\)"/, "must pass the background inline (1.3.13 has no --background-file)");
+    assert.doesNotMatch(yml, /--background-file "/, "must not invoke the unsupported --background-file flag");
+    assert.match(yml, /cat "\$CONVENTIONS_DIRECTIVE"/, "the framing directive must precede the inlined doc");


🟡 P2 This assertion only proves the directive text appears somewhere in action.yml; it does not verify that the directive is appended before the base-revision document. If the shell block is later reordered so the untrusted conventions are written before the framing directive, this security test would still pass as long as both snippets remain present. Consider asserting the relative order (for example, locate cat "$CONVENTIONS_DIRECTIVE" and ensure it precedes the printf '%s\n' "$doc" append within the same block).

chatgpt-codex-connector

💡 Codex Review

orca-code-review/action.yml

Lines 690 to 692 in e8a4df7

    
                     ocr review --from "$BASE" --to "$HEAD" \ 
        
                       --background "$(cat "$BACKGROUND")" --format json \ 
        
                       > "$1" 2> "$REVIEW_LOG" || rc=$?

Cap convention data before passing it as a single argument

When the first available root convention file is larger than Linux's per-argument limit (roughly 128 KiB), such as a substantial CONTRIBUTING.md, command substitution makes the --background value too large and ocr fails with Argument list too long before any review runs. The action accepts CONTRIBUTING.md without a size bound and only has an inline-background path, so truncate/skip oversized convention files (or upgrade to a file-based engine interface) rather than turning these otherwise valid PR reviews into failed checks.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

Open a pull request for review
Mark a draft as ready
Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

Only inline the base-revision conventions doc when the PR targets the repo's default branch — a PR base is author-chosen, so only the default branch is a protected ref the author cannot rewrite. Cap the appended doc at 32 KiB to keep the inline --background argv under E2BIG, and pin the framing-directive-before-doc order in the test. Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

github-actions

🐳 Orca-Code-Review

Found 1 issue in this PR: ⚪ 1 P3.

_{Reviewed via OrcaRouter — Route Smarter. Ship Safer. Spend Less.}

github-actions · 2026-07-17T09:43:21Z

+// by the PR) via `git show "$BASE:<path>"` and inlines it into the background
+// file, framed as untrusted data that can never weaken the review or change
+// severity tags. Size is safe because we pass --background-file (a path), not
+// an inline --background argv value.


⚪ P3 This comment is now inconsistent with the assertions below and the current workflow: the background is passed inline via --background "$(cat "$BACKGROUND")", not via --background-file. That can mislead future changes to this security-sensitive wiring and the argv-size cap rationale.

chatgpt-codex-connector Bot reviewed Jul 17, 2026

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ZhenghuaBao and others added 2 commits July 17, 2026 17:11

github-actions Bot reviewed Jul 17, 2026

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chatgpt-codex-connector Bot reviewed Jul 17, 2026

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Comment thread action.yml Outdated

github-actions Bot reviewed Jul 17, 2026

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ZhenghuaBao merged commit 96a0f87 into main Jul 17, 2026
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Feed repo conventions (AGENTS.md/CLAUDE.md) to the review engine - #5

Feed repo conventions (AGENTS.md/CLAUDE.md) to the review engine#5
ZhenghuaBao merged 4 commits into
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feat/agents-md-conventions

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	ocr review --from "$BASE" --to "$HEAD" \
	--background "$(cat "$BACKGROUND")" --format json \
	> "$1" 2> "$REVIEW_LOG" \|\| rc=$?

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Orca-Code-Review — push 3

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