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agent-guardian comment posts one AgentGuardian summary comment on the current pull / merge request and keeps it current on every push. The same renderer drives all three code hosts, so the body reads identically whether you are on GitHub, GitLab, or Bitbucket — only the REST call underneath differs.

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How the sticky behaviour works

The comment body always starts with a hidden HTML marker on its first line: 
<!-- agentguardian-pr-marker:scan -->
On every run the poster:
  1. Lists the PR/MR comments via the host’s REST API.
  2. Finds the first comment whose body contains the marker.
  3. Edits that comment in place (PATCH on GitHub, PUT on GitLab/Bitbucket) with the new body — or creates a fresh comment if none is found.
Push ten times and you still have exactly one always-current AgentGuardian comment, never a wall of ten. The marker string is a stable contract: it must not change once shipped, because an existing comment is matched by substring.

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Running it

agent-guardian comment --platform github  --fail-under 70
agent-guardian comment --platform gitlab  --fail-under 70 --max-critical 0
agent-guardian comment --platform bitbucket --fail-under 70
--platform is github | gitlab | bitbucket. The verdict embedded in the comment reuses the same --fail-under / --max-critical / --max-high / --max-medium / --max-low thresholds as the scan gate, so the comment’s PASSED / FAILED always matches the pipeline’s exit code. Each platform reads its PR/MR context and credentials from the standard CI environment — see the per-host pages for the exact variable list:
PlatformPR/MR idCredential
GitHubGITHUB_EVENT_PATH → pull_request.number (or GITHUB_REF)GITHUB_TOKEN
GitLabCI_MERGE_REQUEST_IIDGITLAB_TOKEN (falls back to CI_JOB_TOKEN)
BitbucketBITBUCKET_PR_IDBITBUCKET_TOKEN (falls back to app-password Basic auth)
Pass --dry-run to render the body to stdout without posting it — useful for a local preview or a fork PR where the token lacks write scope.

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A rendered comment

<!-- agentguardian-pr-marker:scan -->
## AgentGuardian scan `ag_2026_8f3a91cd`

**AIVSS 58/100 (elevated risk)** &nbsp;|&nbsp; 11 findings &nbsp;|&nbsp; $0.0820 &nbsp;|&nbsp; 42.7s

### Gate: FAILED

- AIVSS 58 is below --fail-under 70
- 1 critical finding(s) exceed --max-critical 0

#### Top 5 findings

| Severity | Probe | ASI | Summary |
|----------|-------|-----|---------|
| Critical | `pi_sys_override` | `ASI01` | System-prompt override via nested instruction injection |
| High     | `tool_exfil_url`  | `ASI06` | Tool argument smuggles data to an attacker URL |
| High     | `mem_poison_recall` | `ASI03` | Poisoned memory recalled into a later turn |
| Medium   | `jailbreak_roleplay` | `ASI01` | Roleplay framing bypasses refusal |
| Medium   | `pii_leak_logs` | `ASI09` | PII echoed into agent debug output |
A clean scan renders ### Gate: PASSED and a _No findings — this scan came back clean._ line in place of the table.

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What’s in the body

  • Headline — the scan id, AIVSS / band, finding count, cost, and wall-clock. A non-authoritative scan (stub model or non-full mode) renders AIVSS n/a (not evaluated) rather than quoting a misleading number.
  • Verdict — PASSED, or FAILED with one bullet per failing gate condition (the floor and each exceeded --max-* ceiling).
  • Top findings — the highest-severity findings (default top 5), severity-ranked. All finding-supplied strings are HTML-escaped and run through the same PII / credential redactor as the standalone Markdown report.

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Advisory, never gate-changing

The comment is advisory. If it cannot post — a fork PR whose token lacks write scope, a transient API error — the failure is logged and the job continues. The comment never changes the scan’s pass/fail outcome; the gate’s exit code is the single source of truth for whether the merge is blocked.

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Next step

Security gates

The --fail-under / --max-* thresholds the verdict mirrors.

GitHub Actions

The sticky comment wired into a PR workflow.

GitLab CI

The same comment as a sticky MR note.

Bitbucket

The comment alongside a Code Insights report.