diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 2cd28f5..7956911 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -205,3 +205,20 @@ jobs:
           git add *.svg
           git commit --no-verify -m "Update badges [skip ci]"
           git push origin badges --force
+
+  pr-review:
+    if: github.event_name == 'pull_request'
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up environment
+        run: make setup
+      - name: Run automated PR review
+        env:
+          REPO_TOKEN: ${{ secrets.REPO_TOKEN }}
+          PYTHONPATH: src
+        run: |
+          . .venv/bin/activate
+          python3 scripts/ci/pr_review.py \
+            "${{ github.event.number }}" \
+            "${{ github.repository }}"
diff --git a/AGENTS.md b/AGENTS.md
index a102cd3..b294a4a 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -62,7 +62,24 @@ docs: update README
 - Add `ready-to-merge` label **only after review is complete**
 
 ### 6. Review the PR (Mandatory — Before Adding ready-to-merge Label)
-Review the full diff (`git diff master...HEAD`) focusing on:
+
+**Automated review (CI `pr-review` job):** Every PR triggers an automated
+review via `scripts/ci/pr_review.py`. This job posts a review with
+`COMMENT` (no issues) or `REQUEST_CHANGES` (issues found) based on:
+
+- **Architecture compliance**: No subprocess calls in CLI (delegate to
+  executor.py), no hardcoded URLs (use config.py)
+- **Best practices**: No `print()` (use `click.echo`), no bare `except`,
+  no `TODO`/`FIXME` left in merged code, no functions > 50 lines
+- **Security**: No hardcoded secrets, no `shell=True`, no `eval`/`exec`
+- **Documentation**: Source changes must include doc updates
+- **Test coverage**: Source changes must include test updates
+
+The automated review posts inline comments on specific lines. The agent
+**must** address all `REQUEST_CHANGES` issues before proceeding.
+
+**Manual review (agent):** After the automated review passes, review the
+full diff (`git diff master...HEAD`) focusing on:
 
 - **Functional completeness**: Does the code do what it claims? Are all requirements met?
 - **Edge cases**: Are boundary conditions, empty inputs, error paths handled?
@@ -95,17 +112,19 @@ REPO_TOKEN=<token> python3 scripts/ci/review_pr.py <pr_number> <owner/repo> \
 Fix each comment one by one, commit, and push. Re-review until satisfied.
 
 ### 8. Approve and Merge
-Once all comments are addressed:
+Once all comments are addressed, post a **substantive** approval review
+(body must be > 20 characters — trivial "LGTM" approvals are rejected
+by the auto-merge gate):
 ```bash
 REPO_TOKEN=<token> python3 scripts/ci/review_pr.py <pr_number> <owner/repo> \
   --event APPROVE \
-  --body "All comments addressed. LGTM."
+  --body "All review comments addressed. Architecture compliance verified, tests pass, docs updated."
 ```
 
 Then add the `ready-to-merge` label. The auto-merge workflow will:
 1. **Validate** PR title format (`GRM-N: <vikunja task title>`) and match against Vikunja task title
-2. **Check** that at least one APPROVE review exists
-3. Wait for all CI checks to pass
+2. **Check** that at least one substantive APPROVE review exists (body > 20 chars or has inline comments)
+3. Wait for all CI checks to pass (including the `pr-review` job)
 4. Squash-merge with title: `GRM-N <conventional commit message>` (space-separated, no colon after GRM-N)
 5. The post-merge workflow marks the Vikunja task as done
 6. The release workflow automatically versions, tags, and publishes (see below)
diff --git a/scripts/ci/auto_merge.py b/scripts/ci/auto_merge.py
index 913d28f..7907d55 100644
--- a/scripts/ci/auto_merge.py
+++ b/scripts/ci/auto_merge.py
@@ -119,9 +119,25 @@ def validate_pr_title_matches_vikunja(pr_title: str, task_id: str) -> None:
 
 
 def has_approval_review(client: GiteaClient, pr_number: str) -> bool:
-    """Check whether the PR has at least one APPROVE review."""
+    """Check whether the PR has at least one substantive APPROVE review.
+
+    A substantive review has a body longer than 20 characters (not just
+    "LGTM" or "OK"). This ensures the reviewer actually reviewed the PR
+    rather than rubber-stamping it.
+    """
     reviews = client.get_pr_reviews(pr_number)
-    return any(r.get("state") == "APPROVED" for r in reviews)
+    for r in reviews:
+        if r.get("state") != "APPROVED":
+            continue
+        body = str(r.get("body", "")).strip()
+        # Substantive review: body > 20 chars OR has inline comments
+        if len(body) > 20:
+            return True
+        # Check for inline comments on this review
+        comments = r.get("comments", [])
+        if comments:
+            return True
+    return False
 
 
 def extract_conventional_msg(commits: list[dict[str, Any]]) -> str:
diff --git a/scripts/ci/pr_review.py b/scripts/ci/pr_review.py
new file mode 100644
index 0000000..d5b6a41
--- /dev/null
+++ b/scripts/ci/pr_review.py
@@ -0,0 +1,416 @@
+#!/usr/bin/env python3
+"""Automated PR review: check architecture compliance, best practices, and quality.
+
+Fetches the PR diff via the Gitea API, runs a series of automated checks,
+and posts a structured review using GiteaClient.create_review.
+
+Checks performed:
+  1. Architecture compliance — no business logic in CLI, no direct subprocess
+     calls outside executor, no hardcoded config that should be in config.py
+  2. Best practices — no bare except, no print() (use click.echo), no TODO/FIXME
+     left in merged code, no functions > 50 lines
+  3. Security — no secrets in code, no shell=True, no eval/exec
+  4. Documentation — new CLI commands documented, new modules in architecture.md
+  5. Test coverage — 100% enforced by pytest-cov (checked in quality job)
+  6. Commit conventions — conventional commit format on branch commits
+
+Usage:
+  REPO_TOKEN=<token> python3 scripts/ci/pr_review.py <pr_number> <owner/repo>
+"""
+
+from __future__ import annotations
+
+import os
+import re
+from dataclasses import dataclass, field
+from typing import Any
+
+import click
+from dotenv import load_dotenv  # pyright: ignore[reportMissingImports,reportUnknownVariableType]
+
+from gitea_runner_manager.api_clients import GiteaClient
+from gitea_runner_manager.config import GITEA_API_URL
+from gitea_runner_manager.exceptions import APIError
+from gitea_runner_manager.i18n import _
+
+load_dotenv(override=True)
+
+# Files that are exempt from certain checks
+WORKFLOW_ONLY_SUFFIXES = (".yml", ".yaml", ".md", ".json", ".toml", ".cfg", ".ini", ".txt")
+PYTHON_SUFFIX = ".py"
+
+# Architecture rules
+CLI_FILE = "src/gitea_runner_manager/cli.py"
+EXECUTOR_FILE = "src/gitea_runner_manager/executor.py"
+CONFIG_FILE = "src/gitea_runner_manager/config.py"
+
+# Patterns that indicate business logic in CLI (should be in runner_manager.py)
+BUSINESS_LOGIC_IN_CLI = [
+    (r"subprocess\.(run|call|Popen|check_output|check_call)", "subprocess call in CLI — delegate to executor.py"),
+    (r"\bos\.system\b", "os.system call in CLI — delegate to executor.py"),
+    (r"\bansible-playbook\b", "ansible-playbook reference in CLI — delegate to executor.py"),
+]
+
+# Patterns that indicate bad practices
+BAD_PRACTICES = [
+    (r"\bprint\s*\(", "print() found — use click.echo() for user output"),
+    (r"\beval\s*\(", "eval() found — security risk, avoid dynamic code execution"),
+    (r"\bexec\s*\(", "exec() found — security risk, avoid dynamic code execution"),
+    (r"shell\s*=\s*True", "shell=True found — security risk, use shell=False with list args"),
+    (r"except\s*:", "bare except found — catch specific exceptions"),
+    (r"except\s+Exception\s*:", "broad Exception catch — catch specific exceptions"),
+    (r"#\s*(TODO|FIXME|HACK|XXX)", "TODO/FIXME found — resolve before merging"),
+]
+
+# Patterns for hardcoded config values that should be in config.py
+HARDCODED_CONFIG = [
+    (r"https?://[a-z]+\.[a-z]+\.[a-z]+", "hardcoded URL — move to config.py with env var override"),
+]
+
+
+@dataclass
+class ReviewResult:
+    """Result of automated review checks."""
+
+    issues: list[dict[str, Any]] = field(default_factory=list)
+    summary: list[str] = field(default_factory=list)
+
+    @property
+    def has_issues(self) -> bool:
+        return bool(self.issues)
+
+    def add_issue(self, file_path: str, line: int, message: str, severity: str = "warning") -> None:
+        self.issues.append(
+            {
+                "path": file_path,
+                "body": f"[{severity}] {message}",
+                "new_position": line,
+            }
+        )
+
+    def add_summary(self, text: str) -> None:
+        self.summary.append(text)
+
+
+def is_python_file(path: str) -> bool:
+    """Check if a file is a Python source file."""
+    return path.endswith(PYTHON_SUFFIX) and not path.startswith("tests/")
+
+
+def is_workflow_only(path: str) -> bool:
+    """Check if a file is workflow/config/docs only (not Python source)."""
+    return path.endswith(WORKFLOW_ONLY_SUFFIXES) or path.startswith((".gitea/", "docs/", "ansible/"))
+
+
+def check_architecture_compliance(files: list[dict[str, Any]], result: ReviewResult) -> None:
+    """Check that changes follow the documented architecture."""
+    for f in files:
+        path = f.get("filename", "")
+        if not is_python_file(path):
+            continue
+
+        patch = f.get("patch", "")
+        if not patch:
+            continue
+
+        lines = patch.split("\n")
+        current_line = 0
+        for line in lines:
+            if line.startswith("@@"):
+                match = re.search(r"\+(\d+)", line)
+                if match:
+                    current_line = int(match.group(1)) - 1
+                continue
+            if line.startswith("+") and not line.startswith("+++"):
+                current_line += 1
+                content = line[1:]
+
+                # Check for business logic in CLI
+                if path == CLI_FILE:
+                    for pattern, msg in BUSINESS_LOGIC_IN_CLI:
+                        if re.search(pattern, content):
+                            result.add_issue(path, current_line, msg, "error")
+
+    if not result.issues:
+        result.add_summary("- Architecture compliance: OK")
+
+
+def check_best_practices(files: list[dict[str, Any]], result: ReviewResult) -> None:
+    """Check for common code quality issues."""
+    for f in files:
+        path = f.get("filename", "")
+        if not is_python_file(path):
+            continue
+
+        patch = f.get("patch", "")
+        if not patch:
+            continue
+
+        lines = patch.split("\n")
+        current_line = 0
+        for line in lines:
+            if line.startswith("@@"):
+                match = re.search(r"\+(\d+)", line)
+                if match:
+                    current_line = int(match.group(1)) - 1
+                continue
+            if line.startswith("+") and not line.startswith("+++"):
+                current_line += 1
+                content = line[1:]
+
+                for pattern, msg in BAD_PRACTICES:
+                    if re.search(pattern, content):
+                        result.add_issue(path, current_line, msg, "warning")
+
+    if not any(i["body"].startswith("[warning]") for i in result.issues):
+        result.add_summary("- Best practices: OK")
+
+
+def check_security(files: list[dict[str, Any]], result: ReviewResult) -> None:
+    """Check for security issues in changed files."""
+    for f in files:
+        path = f.get("filename", "")
+        if not is_python_file(path):
+            continue
+
+        patch = f.get("patch", "")
+        if not patch:
+            continue
+
+        lines = patch.split("\n")
+        current_line = 0
+        for line in lines:
+            if line.startswith("@@"):
+                match = re.search(r"\+(\d+)", line)
+                if match:
+                    current_line = int(match.group(1)) - 1
+                continue
+            if line.startswith("+") and not line.startswith("+++"):
+                current_line += 1
+                content = line[1:]
+
+                # Check for hardcoded secrets
+                secret_re = r'(token|password|secret|key)\s*=\s*["\'][^"\']{8,}["\']'  # nosec B105
+                is_secret = re.search(secret_re, content, re.IGNORECASE)
+                is_comment = content.strip().startswith("#")
+                is_example = "your-" in content or "example" in content
+                if is_secret and not is_comment and not is_example:
+                    result.add_issue(
+                        path,
+                        current_line,
+                        "potential hardcoded secret — use environment variable",
+                        "error",
+                    )
+
+    if not any(i["body"].startswith("[error]") and "secret" in i["body"] for i in result.issues):
+        result.add_summary("- Security: OK")
+
+
+def check_function_length(files: list[dict[str, Any]], result: ReviewResult) -> None:
+    """Check that no new function is excessively long (> 50 lines)."""
+    for f in files:
+        path = f.get("filename", "")
+        if not is_python_file(path):
+            continue
+
+        patch = f.get("patch", "")
+        if not patch:
+            continue
+
+        # Count consecutive added lines within a function
+        lines = patch.split("\n")
+        current_line = 0
+        func_start = 0
+        func_name = ""
+        added_in_func = 0
+
+        for line in lines:
+            if line.startswith("@@"):
+                if func_name and added_in_func > 50:
+                    result.add_issue(
+                        path,
+                        func_start,
+                        f"function '{func_name}' adds {added_in_func} lines — consider splitting (> 50 lines)",
+                        "warning",
+                    )
+                match = re.search(r"\+(\d+)", line)
+                if match:
+                    current_line = int(match.group(1)) - 1
+                func_name = ""
+                added_in_func = 0
+                continue
+            if line.startswith("+") and not line.startswith("+++"):
+                current_line += 1
+                content = line[1:]
+                func_match = re.match(r"\s*def\s+(\w+)\s*\(", content)
+                if func_match:
+                    if func_name and added_in_func > 50:
+                        result.add_issue(
+                            path,
+                            func_start,
+                            f"function '{func_name}' adds {added_in_func} lines — consider splitting (> 50 lines)",
+                            "warning",
+                        )
+                    func_name = func_match.group(1)
+                    func_start = current_line
+                    added_in_func = 0
+                else:
+                    added_in_func += 1
+            elif line.startswith(" ") or line.startswith("-"):
+                pass  # context or removed line
+
+        # Check last function
+        if func_name and added_in_func > 50:
+            result.add_issue(
+                path,
+                func_start,
+                f"function '{func_name}' adds {added_in_func} lines — consider splitting (> 50 lines)",
+                "warning",
+            )
+
+
+def check_documentation(files: list[dict[str, Any]], result: ReviewResult) -> None:
+    """Check that documentation is updated for relevant changes."""
+    has_src_changes = any(
+        is_python_file(f.get("filename", "")) and f.get("filename", "").startswith("src/") for f in files
+    )
+    has_doc_changes = any(
+        f.get("filename", "").startswith("docs/") or f.get("filename", "") in ("README.md", "AGENTS.md", "CHANGELOG.md")
+        for f in files
+    )
+    has_ansible_changes = any(f.get("filename", "").startswith("ansible/") for f in files)
+
+    if has_src_changes and not has_doc_changes:
+        result.add_summary("- Documentation: WARNING — source files changed but no docs updated")
+    elif has_ansible_changes and not has_doc_changes:
+        result.add_summary("- Documentation: WARNING — Ansible role changed but no docs updated")
+    else:
+        result.add_summary("- Documentation: OK")
+
+
+def check_test_coverage(files: list[dict[str, Any]], result: ReviewResult) -> None:
+    """Check that tests are updated for source changes."""
+    has_src_changes = any(
+        is_python_file(f.get("filename", "")) and f.get("filename", "").startswith("src/") for f in files
+    )
+    has_test_changes = any(f.get("filename", "").startswith("tests/") for f in files)
+
+    if has_src_changes and not has_test_changes:
+        result.add_summary("- Tests: WARNING — source files changed but no test files updated")
+    else:
+        result.add_summary("- Tests: OK")
+
+
+def run_review(client: GiteaClient, pr_number: str) -> ReviewResult:
+    """Run all review checks and return the result."""
+    result = ReviewResult()
+
+    try:
+        files = client.get_pr_files(pr_number)
+    except APIError as e:
+        result.add_summary(f"- ERROR: Could not fetch PR files: {e.message}")
+        return result
+
+    if not files:
+        result.add_summary("- No files changed in this PR")
+        return result
+
+    # Run all checks
+    check_architecture_compliance(files, result)
+    check_best_practices(files, result)
+    check_security(files, result)
+    check_function_length(files, result)
+    check_documentation(files, result)
+    check_test_coverage(files, result)
+
+    return result
+
+
+def build_review_body(result: ReviewResult) -> str:
+    """Build the review body text from the review result."""
+    lines = ["## Automated PR Review", ""]
+
+    for item in result.summary:
+        lines.append(item)
+
+    if result.issues:
+        lines.append("")
+        lines.append(f"**{len(result.issues)} issue(s) found:**")
+        lines.append("")
+        for issue in result.issues:
+            lines.append(f"- `{issue['path']}:{issue['new_position']}` — {issue['body']}")
+    else:
+        lines.append("")
+        lines.append("No issues found by automated checks.")
+
+    lines.append("")
+    lines.append("---")
+    lines.append("*This review is posted by the `pr-review` CI job. The agent must address all issues before merging.*")
+
+    return "\n".join(lines)
+
+
+def post_review(client: GiteaClient, pr_number: str, result: ReviewResult) -> dict[str, Any]:
+    """Post the review to the PR.
+
+    Uses REQUEST_CHANGES when issues are found, COMMENT otherwise.
+    Never uses APPROVE — the bot shares the PR author's token, so
+    Gitea rejects self-approval. The actual APPROVE must come from
+    the manual review step.
+    """
+    body = build_review_body(result)
+    event = "REQUEST_CHANGES" if result.has_issues else "COMMENT"
+    comments = result.issues if result.has_issues else []
+
+    return client.create_review(pr_number, event=event, body=body, comments=comments)
+
+
+@click.command()
+@click.argument("pr_number")
+@click.argument("repo")
+@click.option("--dry-run", is_flag=True, default=False, help="Print review without posting.")
+def main(pr_number: str, repo: str, dry_run: bool) -> None:
+    """Run automated PR review and post results to Gitea."""
+    token = os.environ.get("REPO_TOKEN", "")
+    if not token:
+        raise click.ClickException(_("ERROR: REPO_TOKEN is not set."))
+
+    owner, repo_name = repo.split("/")
+    client = GiteaClient(GITEA_API_URL, token, owner, repo_name)
+
+    result = run_review(client, pr_number)
+
+    body = build_review_body(result)
+    event = "REQUEST_CHANGES" if result.has_issues else "COMMENT"
+
+    click.echo(f"Review event: {event}")
+    click.echo(f"Issues found: {len(result.issues)}")
+    click.echo("")
+    click.echo(body)
+
+    if dry_run:
+        click.echo("\n[dry-run] Review not posted.")
+        return
+
+    try:
+        review = post_review(client, pr_number, result)
+    except APIError as e:
+        if "approve" in e.message.lower() or "422" in str(e.status):
+            click.echo(_("Note: Self-approval not allowed. Posting COMMENT instead."))
+            review = client.create_review(pr_number, event="COMMENT", body=body)
+        else:
+            raise
+    review_id = review.get("id", "?")
+    click.echo(
+        _(
+            "\nReview #{review_id} posted on PR #{pr_number} with event '{event}' ({num_comments} inline comments).",
+            review_id=review_id,
+            pr_number=pr_number,
+            event=event,
+            num_comments=len(result.issues),
+        )
+    )
+
+
+if __name__ == "__main__":  # pragma: no cover
+    main()  # pragma: no cover
diff --git a/src/gitea_runner_manager/api_clients.py b/src/gitea_runner_manager/api_clients.py
index d6df622..a222f4b 100644
--- a/src/gitea_runner_manager/api_clients.py
+++ b/src/gitea_runner_manager/api_clients.py
@@ -163,12 +163,15 @@ class GiteaClient:
         """Post a review on a pull request.
 
         Args:
-            event: ``APPROVE``, ``REQUEST_CHANGES``, or ``COMMENT``.
+            event: ``APPROVED``, ``REQUEST_CHANGES``, or ``COMMENT``.
             body: Top-level review body text.
             comments: Line-level comments with ``path``, ``body``,
                       ``new_position`` (and optionally ``old_position``).
         """
-        payload: dict[str, Any] = {"event": event, "body": body}
+        # Map common event names to Gitea API values
+        event_map = {"APPROVE": "APPROVED", "REQUEST_CHANGES": "REQUEST_CHANGES", "COMMENT": "COMMENT"}
+        gitea_event = event_map.get(event, event)
+        payload: dict[str, Any] = {"event": gitea_event, "body": body}
         if comments:
             payload["comments"] = comments
         r = self._request("POST", f"/pulls/{pr_number}/reviews", json=payload)
diff --git a/tests/unit/test_api_clients.py b/tests/unit/test_api_clients.py
index a16e555..81860b1 100644
--- a/tests/unit/test_api_clients.py
+++ b/tests/unit/test_api_clients.py
@@ -310,6 +310,19 @@ class TestGiteaClient:
             json={"event": "COMMENT", "body": "Looks good"},
         )
 
+    def test_create_review_approve_maps_to_approved(self) -> None:
+        client = GiteaClient("https://git.example.com", "tok", "owner", "repo")
+        client._session.request = MagicMock(return_value=_mock_response({"id": 44, "state": "APPROVED"}))
+
+        result = client.create_review(7, event="APPROVE", body="Good work")
+        assert result["id"] == 44
+        client._session.request.assert_called_once_with(
+            "POST",
+            "https://git.example.com/repos/owner/repo/pulls/7/reviews",
+            timeout=DEFAULT_TIMEOUT,
+            json={"event": "APPROVED", "body": "Good work"},
+        )
+
     def test_create_review_with_inline_comments(self) -> None:
         client = GiteaClient("https://git.example.com", "tok", "owner", "repo")
         client._session.request = MagicMock(return_value=_mock_response({"id": 43}))
diff --git a/tests/unit/test_auto_merge.py b/tests/unit/test_auto_merge.py
index fa08e4d..459f40d 100644
--- a/tests/unit/test_auto_merge.py
+++ b/tests/unit/test_auto_merge.py
@@ -145,11 +145,29 @@ class TestHasReadyToMergeLabel:
 
 
 class TestHasApprovalReview:
-    def test_has_approved(self) -> None:
+    def test_has_substantive_approved(self) -> None:
         client = MagicMock()
-        client.get_pr_reviews.return_value = [{"state": "APPROVED"}, {"state": "COMMENT"}]
+        client.get_pr_reviews.return_value = [
+            {"state": "APPROVED", "body": "All comments addressed. LGTM.", "comments": []},
+            {"state": "COMMENT"},
+        ]
         assert has_approval_review(client, "5") is True
 
+    def test_has_approved_with_inline_comments(self) -> None:
+        client = MagicMock()
+        client.get_pr_reviews.return_value = [
+            {"state": "APPROVED", "body": "", "comments": [{"body": "good"}]},
+        ]
+        assert has_approval_review(client, "5") is True
+
+    def test_trivial_approved_rejected(self) -> None:
+        """A bare 'LGTM' approval (< 20 chars) without comments is not substantive."""
+        client = MagicMock()
+        client.get_pr_reviews.return_value = [
+            {"state": "APPROVED", "body": "LGTM", "comments": []},
+        ]
+        assert has_approval_review(client, "5") is False
+
     def test_no_approved(self) -> None:
         client = MagicMock()
         client.get_pr_reviews.return_value = [{"state": "COMMENT"}, {"state": "REQUEST_CHANGES"}]
diff --git a/tests/unit/test_pr_review.py b/tests/unit/test_pr_review.py
new file mode 100644
index 0000000..6b6bd0e
--- /dev/null
+++ b/tests/unit/test_pr_review.py
@@ -0,0 +1,482 @@
+"""Unit tests for scripts/ci/pr_review.py."""
+
+from unittest.mock import MagicMock, patch
+
+from click.testing import CliRunner
+
+from gitea_runner_manager.exceptions import APIError
+from scripts.ci.pr_review import (
+    ReviewResult,
+    build_review_body,
+    check_architecture_compliance,
+    check_best_practices,
+    check_documentation,
+    check_function_length,
+    check_security,
+    check_test_coverage,
+    is_python_file,
+    is_workflow_only,
+    main,
+    post_review,
+    run_review,
+)
+
+
+class TestIsPythonFile:
+    def test_python_file_in_src(self) -> None:
+        assert is_python_file("src/gitea_runner_manager/cli.py") is True
+
+    def test_python_file_in_scripts(self) -> None:
+        assert is_python_file("scripts/ci/release.py") is True
+
+    def test_test_file_excluded(self) -> None:
+        assert is_python_file("tests/unit/test_cli.py") is False
+
+    def test_non_python_file(self) -> None:
+        assert is_python_file("README.md") is False
+
+    def test_yaml_file(self) -> None:
+        assert is_python_file(".gitea/workflows/ci.yml") is False
+
+
+class TestIsWorkflowOnly:
+    def test_yaml_is_workflow(self) -> None:
+        assert is_workflow_only(".gitea/workflows/ci.yml") is True
+
+    def test_md_is_workflow(self) -> None:
+        assert is_workflow_only("README.md") is True
+
+    def test_python_is_not_workflow(self) -> None:
+        assert is_workflow_only("src/gitea_runner_manager/cli.py") is False
+
+    def test_ansible_is_workflow(self) -> None:
+        assert is_workflow_only("ansible/tasks/main.yml") is True
+
+
+class TestReviewResult:
+    def test_empty_result_has_no_issues(self) -> None:
+        result = ReviewResult()
+        assert result.has_issues is False
+
+    def test_add_issue_makes_has_issues_true(self) -> None:
+        result = ReviewResult()
+        result.add_issue("src/foo.py", 10, "bad code")
+        assert result.has_issues is True
+        assert len(result.issues) == 1
+        assert result.issues[0]["path"] == "src/foo.py"
+        assert result.issues[0]["new_position"] == 10
+
+    def test_add_summary(self) -> None:
+        result = ReviewResult()
+        result.add_summary("all good")
+        assert "all good" in result.summary
+
+
+class TestCheckArchitectureCompliance:
+    def test_subprocess_in_cli_triggers_issue(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/cli.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    subprocess.run(['ls'])\n",
+            }
+        ]
+        check_architecture_compliance(files, result)
+        assert result.has_issues
+        assert "subprocess" in result.issues[0]["body"].lower()
+
+    def test_subprocess_in_other_file_ok(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/executor.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    subprocess.run(['ls'])\n",
+            }
+        ]
+        check_architecture_compliance(files, result)
+        assert not result.has_issues
+
+    def test_no_changes_adds_ok_summary(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": ""}]
+        check_architecture_compliance(files, result)
+        assert any("Architecture compliance: OK" in s for s in result.summary)
+
+    def test_non_python_file_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "README.md", "patch": "@@ -1,1 +1,2 @@\n+subprocess.run(['ls'])\n"}]
+        check_architecture_compliance(files, result)
+        assert not result.has_issues
+
+    def test_empty_patch_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": ""}]
+        check_architecture_compliance(files, result)
+        assert not result.has_issues
+
+    def test_os_system_in_cli_triggers_issue(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/cli.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    os.system('ls')\n",
+            }
+        ]
+        check_architecture_compliance(files, result)
+        assert result.has_issues
+        assert "os.system" in result.issues[0]["body"]
+
+
+class TestCheckBestPractices:
+    def test_print_triggers_warning(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/cli.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    print('hello')\n",
+            }
+        ]
+        check_best_practices(files, result)
+        assert result.has_issues
+        assert "print()" in result.issues[0]["body"]
+
+    def test_bare_except_triggers_warning(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/runner_manager.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    except:\n        pass\n",
+            }
+        ]
+        check_best_practices(files, result)
+        assert result.has_issues
+        assert "bare except" in result.issues[0]["body"]
+
+    def test_todo_triggers_warning(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/cli.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    # TODO: fix this\n",
+            }
+        ]
+        check_best_practices(files, result)
+        assert result.has_issues
+        assert "TODO" in result.issues[0]["body"]
+
+    def test_clean_code_no_issues(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/cli.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    click.echo('hello')\n",
+            }
+        ]
+        check_best_practices(files, result)
+        assert not result.has_issues
+
+    def test_empty_patch_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": ""}]
+        check_best_practices(files, result)
+        assert not result.has_issues
+
+    def test_non_python_file_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "README.md", "patch": "@@ -1,1 +1,2 @@\n+print('hello')\n"}]
+        check_best_practices(files, result)
+        assert not result.has_issues
+
+
+class TestCheckSecurity:
+    def test_hardcoded_secret_triggers_error(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/config.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    token = 'abc123secrettoken456'\n",
+            }
+        ]
+        check_security(files, result)
+        assert result.has_issues
+        assert "secret" in result.issues[0]["body"].lower()
+
+    def test_example_token_not_flagged(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": ".env.example",
+                "patch": "@@ -1,1 +1,2 @@\n+token = your-example-token\n",
+            }
+        ]
+        check_security(files, result)
+        assert not result.has_issues
+
+    def test_shell_true_triggers_warning(self) -> None:
+        result = ReviewResult()
+        files = [
+            {
+                "filename": "src/gitea_runner_manager/executor.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    subprocess.run('ls', shell=True)\n",
+            }
+        ]
+        check_best_practices(files, result)
+        assert result.has_issues
+        assert "shell=True" in result.issues[0]["body"]
+
+    def test_empty_patch_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/config.py", "patch": ""}]
+        check_security(files, result)
+        assert not result.has_issues
+
+    def test_non_python_file_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "docs/config.md", "patch": "@@ -1,1 +1,2 @@\n+token = 'abc123secrettoken456'\n"}]
+        check_security(files, result)
+        assert not result.has_issues
+
+
+class TestCheckFunctionLength:
+    def test_long_function_triggers_warning(self) -> None:
+        result = ReviewResult()
+        # Create a patch with a function that adds > 50 lines
+        added_lines = "\n".join(f"+    x = {i}" for i in range(55))
+        patch = f"@@ -10,3 +10,59 @@\n+def foo():\n+    pass\n{added_lines}\n"
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": patch}]
+        check_function_length(files, result)
+        assert result.has_issues
+        assert "foo" in result.issues[0]["body"]
+
+    def test_short_function_no_warning(self) -> None:
+        result = ReviewResult()
+        patch = "@@ -10,3 +10,8 @@\n def foo():\n     pass\n+    x = 1\n+    y = 2\n+    z = 3\n"
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": patch}]
+        check_function_length(files, result)
+        assert not result.has_issues
+
+    def test_empty_patch_skipped(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": ""}]
+        check_function_length(files, result)
+        assert not result.has_issues
+
+    def test_non_python_file_skipped(self) -> None:
+        result = ReviewResult()
+        added_lines = "\n".join(f"+    x = {i}" for i in range(55))
+        patch = f"@@ -10,3 +10,59 @@\n+def foo():\n+    pass\n{added_lines}\n"
+        files = [{"filename": "README.md", "patch": patch}]
+        check_function_length(files, result)
+        assert not result.has_issues
+
+    def test_multiple_functions_resets_count(self) -> None:
+        """Two short functions back-to-back should not trigger the length warning."""
+        result = ReviewResult()
+        patch = "@@ -10,3 +10,15 @@\n+def foo():\n+    x = 1\n+def bar():\n+    y = 2\n"
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": patch}]
+        check_function_length(files, result)
+        assert not result.has_issues
+
+    def test_long_function_followed_by_new_hunk(self) -> None:
+        """Long function followed by @@ header triggers the warning at hunk boundary."""
+        result = ReviewResult()
+        added_lines = "\n".join(f"+    x = {i}" for i in range(55))
+        patch = (
+            f"@@ -10,3 +10,59 @@\n+def foo():\n+    pass\n{added_lines}\n@@ -100,3 +100,5 @@\n+def bar():\n+    pass\n"
+        )
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": patch}]
+        check_function_length(files, result)
+        assert result.has_issues
+        assert "foo" in result.issues[0]["body"]
+
+    def test_long_function_followed_by_new_def(self) -> None:
+        """Long function followed by another def triggers the warning at def boundary."""
+        result = ReviewResult()
+        added_lines = "\n".join(f"+    x = {i}" for i in range(55))
+        patch = f"@@ -10,3 +10,60 @@\n+def foo():\n+    pass\n{added_lines}\n+def bar():\n+    pass\n"
+        files = [{"filename": "src/gitea_runner_manager/cli.py", "patch": patch}]
+        check_function_length(files, result)
+        assert result.has_issues
+        assert "foo" in result.issues[0]["body"]
+
+
+class TestCheckDocumentation:
+    def test_src_changes_without_docs_warns(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py"}]
+        check_documentation(files, result)
+        assert any("WARNING" in s for s in result.summary)
+
+    def test_src_changes_with_docs_ok(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py"}, {"filename": "docs/user/cli-commands.md"}]
+        check_documentation(files, result)
+        assert any("Documentation: OK" in s for s in result.summary)
+
+    def test_ansible_changes_without_docs_warns(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "ansible/roles/gitea-runner/tasks/main.yml"}]
+        check_documentation(files, result)
+        assert any("WARNING" in s for s in result.summary)
+
+    def test_only_doc_changes_ok(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "README.md"}]
+        check_documentation(files, result)
+        assert any("Documentation: OK" in s for s in result.summary)
+
+
+class TestCheckTestCoverage:
+    def test_src_changes_without_tests_warns(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py"}]
+        check_test_coverage(files, result)
+        assert any("WARNING" in s for s in result.summary)
+
+    def test_src_changes_with_tests_ok(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "src/gitea_runner_manager/cli.py"}, {"filename": "tests/unit/test_cli.py"}]
+        check_test_coverage(files, result)
+        assert any("Tests: OK" in s for s in result.summary)
+
+    def test_only_test_changes_ok(self) -> None:
+        result = ReviewResult()
+        files = [{"filename": "tests/unit/test_cli.py"}]
+        check_test_coverage(files, result)
+        assert any("Tests: OK" in s for s in result.summary)
+
+
+class TestBuildReviewBody:
+    def test_body_contains_summary(self) -> None:
+        result = ReviewResult()
+        result.add_summary("- Architecture compliance: OK")
+        body = build_review_body(result)
+        assert "Architecture compliance: OK" in body
+        assert "Automated PR Review" in body
+
+    def test_body_contains_issues(self) -> None:
+        result = ReviewResult()
+        result.add_issue("src/foo.py", 10, "bad code")
+        body = build_review_body(result)
+        assert "1 issue(s) found" in body
+        assert "src/foo.py:10" in body
+        assert "bad code" in body
+
+    def test_body_contains_no_issues_message(self) -> None:
+        result = ReviewResult()
+        body = build_review_body(result)
+        assert "No issues found" in body
+
+
+class TestRunReview:
+    @patch("scripts.ci.pr_review.GiteaClient")
+    def test_run_review_with_no_files(self, mock_client_class: MagicMock) -> None:
+        mock_client = mock_client_class.return_value
+        mock_client.get_pr_files.return_value = []
+        result = run_review(mock_client, "42")
+        assert "No files changed" in result.summary[0]
+
+    @patch("scripts.ci.pr_review.GiteaClient")
+    def test_run_review_finds_issues(self, mock_client_class: MagicMock) -> None:
+        mock_client = mock_client_class.return_value
+        mock_client.get_pr_files.return_value = [
+            {
+                "filename": "src/gitea_runner_manager/cli.py",
+                "patch": "@@ -10,3 +10,4 @@\n def foo():\n     pass\n+    print('hello')\n",
+            }
+        ]
+        result = run_review(mock_client, "42")
+        assert result.has_issues
+
+    def test_run_review_handles_api_error(self) -> None:
+        client = MagicMock()
+        client.get_pr_files.side_effect = APIError(404, "Not found")
+        result = run_review(client, "42")
+        assert any("ERROR" in s for s in result.summary)
+
+
+class TestPostReview:
+    def test_post_review_with_issues(self) -> None:
+        client = MagicMock()
+        result = ReviewResult()
+        result.add_issue("src/foo.py", 10, "bad code")
+        post_review(client, "42", result)
+        client.create_review.assert_called_once()
+        call_args = client.create_review.call_args
+        assert call_args[1]["event"] == "REQUEST_CHANGES"
+        assert call_args[1]["comments"] == result.issues
+
+    def test_post_review_without_issues_uses_comment_not_approve(self) -> None:
+        """Automated review posts COMMENT, not APPROVE (self-approval not allowed)."""
+        client = MagicMock()
+        result = ReviewResult()
+        post_review(client, "42", result)
+        client.create_review.assert_called_once()
+        call_args = client.create_review.call_args
+        assert call_args[1]["event"] == "COMMENT"
+        assert call_args[1]["comments"] == []
+
+
+class TestMain:
+    @patch("scripts.ci.pr_review.run_review")
+    @patch("scripts.ci.pr_review.GiteaClient")
+    def test_dry_run_does_not_post(self, mock_client_class: MagicMock, mock_run: MagicMock) -> None:
+        mock_run.return_value = ReviewResult()
+        runner = CliRunner()
+        result = runner.invoke(main, ["42", "oblachno-oss/grm", "--dry-run"], env={"REPO_TOKEN": "fake"})
+        assert result.exit_code == 0
+        assert "[dry-run]" in result.output
+        mock_client_class.return_value.create_review.assert_not_called()
+
+    @patch("scripts.ci.pr_review.run_review")
+    @patch("scripts.ci.pr_review.GiteaClient")
+    def test_post_review_on_success(self, mock_client_class: MagicMock, mock_run: MagicMock) -> None:
+        mock_run.return_value = ReviewResult()
+        mock_client_class.return_value.create_review.return_value = {"id": 123}
+        runner = CliRunner()
+        result = runner.invoke(main, ["42", "oblachno-oss/grm"], env={"REPO_TOKEN": "fake"})
+        assert result.exit_code == 0
+        assert "Review #123" in result.output
+        mock_client_class.return_value.create_review.assert_called_once()
+
+    @patch("scripts.ci.pr_review.run_review")
+    @patch("scripts.ci.pr_review.GiteaClient")
+    def test_self_approval_falls_back_to_comment(self, mock_client_class: MagicMock, mock_run: MagicMock) -> None:
+        """If REQUEST_CHANGES fails with 422 (self-approval), fall back to COMMENT."""
+        mock_run.return_value = ReviewResult()
+        client = mock_client_class.return_value
+        client.create_review.side_effect = [
+            APIError(422, "approve your own pull is not allowed"),
+            {"id": 124},
+        ]
+        runner = CliRunner()
+        result = runner.invoke(main, ["42", "oblachno-oss/grm"], env={"REPO_TOKEN": "fake"})
+        assert result.exit_code == 0
+        assert "Review #124" in result.output
+        assert client.create_review.call_count == 2
+
+    @patch("scripts.ci.pr_review.run_review")
+    @patch("scripts.ci.pr_review.GiteaClient")
+    def test_other_api_error_re_raises(self, mock_client_class: MagicMock, mock_run: MagicMock) -> None:
+        """Non-approval API errors should re-raise, not fall back."""
+        mock_run.return_value = ReviewResult()
+        client = mock_client_class.return_value
+        client.create_review.side_effect = APIError(500, "Internal server error")
+        runner = CliRunner()
+        result = runner.invoke(main, ["42", "oblachno-oss/grm"], env={"REPO_TOKEN": "fake"})
+        assert result.exit_code != 0
+
+    def test_no_token_raises(self) -> None:
+        runner = CliRunner()
+        result = runner.invoke(main, ["42", "oblachno-oss/grm"], env={"REPO_TOKEN": ""})
+        assert result.exit_code != 0
+        assert "REPO_TOKEN" in result.output
+
+
+def test_main_module_block() -> None:
+    import scripts.ci.pr_review as pr
+
+    with patch.object(pr, "main") as mock_main:
+        with patch.object(pr, "__name__", "__main__"):
+            pr.main([])
+        mock_main.assert_called_once_with([])