diff --git a/docs/changelog.md b/docs/changelog.md
index 9e48953..f3e0144 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -11,6 +11,7 @@ below and to the page that documents the feature properly.
 
 | Version | What changed | Documented in |
 |---|---|---|
+| [2.20.1](#v2201) | `--ai-only` checks a pull request description against the AI rules; JSON reports `ai_tools`; Warp, Crush, credit trailers and agent run links recognised | [Checking a pull request description](guides/policies.md#checking-a-pull-request-description) · [CC013](rules.md#cc013) |
 | [2.20.0](#v2200) | A commit authored by an AI tool rejected (CC017); Continue, Mistral Vibe and Qwen Code recognised; subject length `0` turns the rule off; Python 3.10 dropped | [CC017](rules.md#cc017) · [CC013](rules.md#cc013) · [CC004](rules.md#cc004) |
 | [2.19.5](#v2195) | GitHub merge queue branches accepted by default; aider's default co-author trailer recognised; exit 2 when git cannot read the repository | [CC201](rules.md#cc201) · [CC013](rules.md#cc013) · [Exit codes](troubleshoot.md#exit-codes) |
 | [2.19.4](#v2194) | `agents/` branches accepted by default; Cursor's `Made-with: Cursor` trailer recognised | [CC201](rules.md#cc201) · [CC013](rules.md#cc013) |
@@ -37,6 +38,36 @@ below and to the page that documents the feature properly.
 | [2.5.0](#v250) | Organization-wide config with `inherit_from` | [Across an organization](guides/organization.md) |
 | [2.0.0](#v200) | Configuration moved from YAML to TOML — breaking | [Migrating from v1](migration.md) |
 
+## v2.20.1 (2026-11-08) { #v2201 }
+
+### Added
+
+* **`--ai-only` checks text that is not a commit message** — it runs only the
+  AI rules ([CC013](rules.md#cc013)–[CC016](rules.md#cc016)) on what you pipe
+  in, so a pull request description can be held to the same `ai_attribution`
+  policy as the commits without being judged as a Conventional Commit. See
+  [Checking a pull request description](guides/policies.md#checking-a-pull-request-description).
+  See PR [#673](https://github.com/commit-check/commit-check/pull/673).
+
+* **JSON output names the AI tools it found** — whenever a message is checked,
+  `--format json` adds `ai_tools`, the tools recognised in the message and, for
+  a commit, in its author. It is filled under every `ai_attribution` policy,
+  `ignore` included, so a workflow can label a pull request without failing
+  it. See [Reading the JSON](example.md#reading-the-json).
+  See PR [#673](https://github.com/commit-check/commit-check/pull/673).
+
+* **[CC013](rules.md#cc013)–[CC016](rules.md#cc016) recognise more AI marks** —
+  `Reviewed-by`, `Suggested-by`, `Helped-by`, `Tested-by` and `Reported-by`
+  naming a known tool; the Claude Code notice without the robot emoji, in
+  italics, or as a lone `https://claude.ai/code/session_...` line; Warp's
+  cloud agent `Warp <agent@warp.dev>`; Crush (`💘 Generated with Crush`,
+  `crush@charm.land`); and the run links agents leave in pull request
+  descriptions: Codex task, Devin session, Jules task and Cursor agent links.
+  A person named in a credit trailer, or a sentence that merely mentions a
+  tool, still passes.
+  See PRs [#672](https://github.com/commit-check/commit-check/pull/672) and
+  [#673](https://github.com/commit-check/commit-check/pull/673).
+
 ## v2.20.0 (2026-11-08) { #v2200 }
 
 ### Added
diff --git a/docs/compare/tools.md b/docs/compare/tools.md
index fd57038..5d0ae6f 100644
--- a/docs/compare/tools.md
+++ b/docs/compare/tools.md
@@ -65,7 +65,7 @@ Replace the hook:
 ```yaml title=".pre-commit-config.yaml"
 repos:
   - repo: https://github.com/commit-check/commit-check
-    rev: v2.20.0
+    rev: v2.20.1
     hooks:
       - id: check-message
 ```
diff --git a/docs/configuration.md b/docs/configuration.md
index 7370bbf..46e3d10 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -274,7 +274,7 @@ Used from a hook definition, with no config file anywhere in the repository:
 ```yaml title=".pre-commit-config.yaml"
 repos:
   - repo: https://github.com/commit-check/commit-check
-    rev: v2.20.0
+    rev: v2.20.1
     hooks:
       - id: check-message
         args:
diff --git a/docs/example.md b/docs/example.md
index db0ef23..7fa022f 100644
--- a/docs/example.md
+++ b/docs/example.md
@@ -162,7 +162,7 @@ pushed:
 ```yaml title=".pre-commit-config.yaml"
 repos:
   - repo: https://github.com/commit-check/commit-check
-    rev: v2.20.0
+    rev: v2.20.1
     hooks:
       - id: check-no-force-push
         stages: [pre-push]
@@ -372,5 +372,20 @@ $ commit-check -m -b --format json | jq '{status, warnings}'
 }
 ```
 
+When a message is checked, the JSON also carries `ai_tools`: the AI tools
+recognised by their known marks in the message and, for a commit, by its
+author. It is filled under every `ai_attribution` policy, the default
+`ignore` included, so a script can act on the attribution without failing
+the commit:
+
+```console
+$ commit-check -m --rev HEAD --format json | jq -c '.ai_tools'
+["Claude Code"]
+```
+
+It reports attribution, not authorship: a sentence that merely mentions a
+tool adds nothing, an empty list does not mean no AI was used, and a listed
+tool may only have assisted.
+
 From Python, [`commit_check.api`](guides/python-api.md) returns the same
 result as a `dict`, without a subprocess.
diff --git a/docs/guides/policies.md b/docs/guides/policies.md
index 8b3fc3f..fdc3516 100644
--- a/docs/guides/policies.md
+++ b/docs/guides/policies.md
@@ -141,11 +141,13 @@ Docs: https://commit-check.com/rules/#cc013
 
 Recognised signatures are co-author and sign-off lines naming Claude Code,
 GitHub Copilot, Codex, Gemini, Cursor, Devin, Aider, Windsurf, Tabby, Amp,
-OpenHands, Factory Droid, Jules, Continue, Mistral Vibe and Qwen Code, the
-disclosure trailers `Assisted-by:` and
+OpenHands, Factory Droid, Jules, Continue, Mistral Vibe, Qwen Code, Warp and
+Crush, credit trailers such as `Reviewed-by:` or `Suggested-by:` naming one of
+those tools, the disclosure trailers `Assisted-by:` and
 `Generated-by:`, vendor marks such as `🤖 Generated with Claude Code`, Amp's
 `Amp-Thread-ID:`, the Copilot coding agent's `Agent-Logs-Url:` and Cursor's
-`Made-with: Cursor`, and generic AI model names. This is the
+`Made-with: Cursor`, agent run links on their own line, and generic AI model
+names; [CC013](../rules.md#cc013) has the full list. This is the
 position [Kubernetes](https://www.kubernetes.dev/docs/guide/pull-requests/)
 takes — no AI trailers in the history, disclosure in the pull request
 instead.
@@ -201,6 +203,29 @@ bots write long ones: Renovate's `Update dependency
 com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer to
 v20261103` is 95 characters.
 
+### Checking a pull request description
+
+Agents leave their mark in the pull request description as often as in the
+commits: `🤖 Generated with Claude Code`, `Link to Devin run: https://app.devin.ai/sessions/...`,
+a Codex task or Cursor agent link. `--ai-only` holds any text to the AI rules
+alone, so the description is not judged as a Conventional Commit:
+
+```console
+$ set -o pipefail   # a failed `gh` must not pass as an empty description
+$ gh pr view 42 --json body -q .body | commit-check --ai-only
+```
+
+Under `ai_attribution = "forbid"` a description with an agent's mark fails
+[CC013](../rules.md#cc013); under `"disclose"` it has to disclose the tool,
+like a commit. Under the default `"ignore"` no rule runs and the check
+passes; `--format json` still lists what it found in `ai_tools`, which is
+enough to label the pull request:
+
+```console
+$ gh pr view 42 --json body -q .body | commit-check --ai-only --format json | jq -c '.ai_tools'
+["Devin"]
+```
+
 ### Asking for disclosure instead
 
 Most projects that allow AI assistance ask to be told about it.
diff --git a/docs/guides/pre-commit.md b/docs/guides/pre-commit.md
index 5960d6b..9141f42 100644
--- a/docs/guides/pre-commit.md
+++ b/docs/guides/pre-commit.md
@@ -8,7 +8,7 @@ Add Commit Check to `.pre-commit-config.yaml`:
 ```yaml title=".pre-commit-config.yaml"
 repos:
   - repo: https://github.com/commit-check/commit-check
-    rev: v2.20.0
+    rev: v2.20.1
     hooks:
       - id: check-message
       - id: check-branch
@@ -68,7 +68,7 @@ Options can be passed as hook arguments, which keeps everything in one file:
 ```yaml title=".pre-commit-config.yaml"
 repos:
   - repo: https://github.com/commit-check/commit-check
-    rev: v2.20.0
+    rev: v2.20.1
     hooks:
       - id: check-message
         args:
@@ -90,7 +90,7 @@ colon, and lets the commit through:
 ```yaml title=".pre-commit-config.yaml"
 repos:
   - repo: https://github.com/commit-check/commit-check
-    rev: v2.20.0
+    rev: v2.20.1
     hooks:
       - id: check-message
         args: [--fix]
diff --git a/docs/rules.md b/docs/rules.md
index 7692f68..39cb179 100644
--- a/docs/rules.md
+++ b/docs/rules.md
@@ -565,11 +565,15 @@ git commit --amend --signoff
 Rejects a commit whose message carries any AI attribution: a co-author or
 sign-off line naming Claude Code, Copilot, Codex, Gemini, Cursor, Devin,
 Aider, Windsurf, Tabby, Amp, OpenHands, Factory Droid, Jules, Continue,
-Mistral Vibe or Qwen Code, a disclosure
-trailer such as `Assisted-by:` or `Generated-by:`, a vendor's own mark such
-as `🤖 Generated with Claude Code`, Amp's `Amp-Thread-ID:` trailer, the
+Mistral Vibe, Qwen Code, Warp or Crush, a disclosure
+trailer such as `Assisted-by:` or `Generated-by:`, a credit trailer such as
+`Reviewed-by:` or `Suggested-by:` naming one of those tools, a vendor's own
+mark such as `🤖 Generated with Claude Code` (with or without the emoji),
+Amp's `Amp-Thread-ID:` trailer, the
 `Agent-Logs-Url:` trailer the Copilot coding agent adds or Cursor's
-`Made-with: Cursor`, and generic AI model names. Copilot is also recognised by its account's
+`Made-with: Cursor`, a run link an agent leaves on its own line (a Claude
+Code session, Codex task, Devin session, Jules task or Cursor agent link),
+and generic AI model names. Copilot is also recognised by its account's
 `N+Copilot@users.noreply.github.com` address, so the coding agent's
 `copilot-swe-agent[bot]` co-author line counts under any display name.