PR GitHub operations

Superagent PR scans run in a sandbox with an authenticated gh CLI. You own GitHub side effects after handoff: inline finding comments, managed labels, and check-run completion.

Read pr-scan-context.json first. It contains owner, repo, prNumber, headSha, checkRunId, reviewedFindingPaths, and dismissedFingerprints.

Critical rule: inline comments, not thread comments

gh pr comment creates issue comments on the PR conversation thread. That is wrong for actionable findings.

For each finding with a changed file and diff line, post a pull request review comment anchored to that line in the Files changed view.

If you already posted findings with gh pr comment, delete those issue comments and repost inline before finishing the scan.

Inspect before posting

owner=OWNER
repo=REPO
pr=PR_NUMBER

# Existing inline review comments
gh api "repos/${owner}/${repo}/pulls/${pr}/comments" --paginate

# Existing general PR thread comments (avoid duplicating here)
gh api "repos/${owner}/${repo}/issues/${pr}/comments" --paginate

# PR diff files and patches (confirm path + line are in the diff)
gh api "repos/${owner}/${repo}/pulls/${pr}/files" --paginate

Skip findings when:

• file is in reviewedFindingPaths
• fingerprint already exists in an inline comment
• you already posted an inline finding on that file this run (one inline finding per file)

Finding comment body format

Every finding comment must include the Superagent marker and fingerprint.

<!-- brin-pr-finding -->
**P0:** Workflow uses pull_request_target trigger for untrusted fork PRs

Short evidence sentence here.

Short recommendation sentence here.

<!-- superagent-finding-fingerprint:HEX_SHA256 -->

Severity to priority: critical → P0, high → P1, medium → P2, low → P3.

Fingerprint: SHA-256 of the normalized comment body before appending the fingerprint line. Lowercase, collapse whitespace, remove the marker and any existing fingerprint comment.

body='<!-- brin-pr-finding -->
**P1:** Overly broad permissions: write-all in privileged workflow

Grants broad write access to GITHUB_TOKEN.

Replace with least-privilege job permissions.'

printf '%s' "$body" \
  | sed 's/<!-- brin-pr-finding -->//g' \
  | tr '[:upper:]' '[:lower:]' \
  | tr -s '[:space:]' ' ' \
  | sed 's/^ //;s/ $//' \
  | sha256sum \
  | awk '{print $1}'

Append the fingerprint as the last line of the comment body.

Use shortevidence and shortrecommendation in inline comments. Keep them terse.

Post inline review comments with gh api

line must be a line number on the RIGHT (added) side of the PR diff for path. Confirm with the PR files API or diff before posting.

Single inline comment

head_sha=HEAD_SHA_FROM_CONTEXT

gh api \
  "repos/${owner}/${repo}/pulls/${pr}/comments" \
  -X POST \
  -f commit_id="$head_sha" \
  -f path=".github/workflows/example.yml" \
  -f side=RIGHT \
  -F line=12 \
  -f body="$comment_body"

Use -F line=12 for numeric fields. Use -f for strings.

Batch inline comments (preferred for multiple findings)

Write review.json:

{
  "commit_id": "HEAD_SHA",
  "event": "COMMENT",
  "body": "<!-- brin-pr-finding -->\nSuperagent found 2 security concern(s).",
  "comments": [
    {
      "path": ".github/workflows/example.yml",
      "line": 4,
      "side": "RIGHT",
      "body": "<!-- brin-pr-finding -->\n**P0:** ...\n\n...\n\n<!-- superagent-finding-fingerprint:abc123... -->"
    },
    {
      "path": ".github/workflows/example.yml",
      "line": 8,
      "side": "RIGHT",
      "body": "<!-- brin-pr-finding -->\n**P1:** ...\n\n...\n\n<!-- superagent-finding-fingerprint:def456... -->"
    }
  ]
}

Post it:

gh api \
  "repos/${owner}/${repo}/pulls/${pr}/reviews" \
  -X POST \
  --input review.json

Post at most 50 inline comments per review. If you have more findings, split across multiple reviews.

Fallback when no diff line exists

Only when a finding has no valid file + line in the PR diff, post a single consolidated issue comment:

gh api \
  "repos/${owner}/${repo}/issues/${pr}/comments" \
  -X POST \
  -f body="$fallback_body"

Never post the same finding both inline and on the thread.

Delete stale or misplaced comments

# Delete inline review comment
gh api "repos/${owner}/${repo}/pulls/comments/COMMENT_ID" -X DELETE

# Delete general PR thread comment
gh api "repos/${owner}/${repo}/issues/comments/COMMENT_ID" -X DELETE

Delete stale Superagent finding comments whose fingerprints are no longer in the current findings set. Delete thread comments you replaced with inline comments.

Managed labels

Only touch Superagent managed labels. Preserve all unrelated labels.

gh pr edit "$pr" --repo "${owner}/${repo}" --add-label "pr:flagged"
gh pr edit "$pr" --repo "${owner}/${repo}" --remove-label "pr:verified"

Clean scan:

gh pr edit "$pr" --repo "${owner}/${repo}" --remove-label "pr:flagged" --add-label "pr:verified"

Complete the check run

Use checkRunId from context. Always set status=completed.

check_run_id=CHECK_RUN_ID_FROM_CONTEXT

gh api \
  "repos/${owner}/${repo}/check-runs/${check_run_id}" \
  -X PATCH \
  -f status=completed \
  -f conclusion=action_required \
  -f 'output[title]=PR requires security review' \
  -f 'output[summary]=2 security concern(s) detected.' \
  -f 'output[text]=Optional longer details.'

Conclusions:

• success — clean scan
• action_required — findings need review
• neutral — inconclusive scan

End-to-end workflow

1. Read pr-scan-context.json and PR input JSON.
2. Run security analysis (other skills) and produce findings with file, line, severity, title, shortevidence, shortrecommendation.
3. List existing inline and thread comments; compute fingerprints; skip dismissed/reviewed/duplicate findings.
4. Post findings as inline review comments with gh api (single comment or batch review). Do not use gh pr comment for findings.
5. Delete stale or misplaced Superagent finding comments.
6. Set managed PR labels.
7. Complete the check run.
8. Write the agent receipt JSON with githuboperationscompleted: true and postedcommentids when available.