--- title: "Pull Request Test Analyzer: review, role & definition · Undominated.ai" canonical: https://undominated.ai/agents/anthropic-pr-test-analyzer/ description: "Maps a pull request to its tests and identifies meaningful missing failure cases, brittle assertions and uncovered behavioral contracts." --- # Pull Request Test Analyzer: review, role & definition · Undominated.ai > Maps a pull request to its tests and identifies meaningful missing failure cases, brittle assertions and uncovered behavioral contracts. [← Explore all agents](/agents/) TESTING AND REVIEW / anthropics # Pull Request Test Analyzer Maps a pull request to its tests and identifies meaningful missing failure cases, brittle assertions and uncovered behavioral contracts. Use this definition ↓Original source ↗ SOURCE REVIEW Reviewed 2026-09-21 Evidence 4 linked sources Publisher anthropics Licence Apache-2.0 ↗ Revision c447c3207a42 Read what was—and wasn’t—checked ↓ “Use this agent when you need to review a pull request for test coverage quality and completeness. This agent should be invoked after a PR” anthropics · upstream description ↗ Our analysis follows below. 01 / THE REASONING ## Why this made the selection. - Prioritizes tests by concrete regressions they would prevent rather than chasing line coverage. - Explicitly checks negative cases, asynchronous behavior, existing integration coverage and tests coupled to implementation details. ### A good fit for - Checking whether a feature pull request covers its important edge cases. - Reviewing the value of proposed tests before adding maintenance overhead. ### Weigh up before choosing - Its internal numerical criticality rubric is a prioritization instruction, not a measured quality score or a catalogue rating. - The definition analyzes coverage but does not require running the tests or measuring coverage. - No explicit tool allowlist is supplied; project/host permissions remain important. 02 / THE REVIEW RECORD ## What we actually inspected. Source review has boundaries. A clear record is more useful than a “safe” badge. ### Material inspected - plugins/pr-review-toolkit/agents/pr-test-analyzer.md (complete frontmatter and body) - plugins/pr-review-toolkit/LICENSE (applicable redistribution terms) - README.md (host and installation guidance) - Host configuration documentation; immutable source and licence hashes ### Our findings - The process starts with the PR diff, maps accompanying tests, and considers integration tests before declaring a gap. - Recommendations must name the regression a test would catch and distinguish critical gaps from optional additions. - It directs attention to project testing standards from CLAUDE.md and warns against trivial or implementation-mirroring tests. ### Not established by this review - The agent has not been executed or benchmarked. - Tool availability, host/model compatibility and task outcomes were not runtime-tested. The review applies to the material and revision named here. A newer upstream release can change its behavior. 03 / PUT IT TO WORK ## Use the role in your project. Upstream setup instructions ↗ - Download the original pr-test-analyzer.md together with its LICENSE and attribution; inspect its instructions, model choice and tools. - For project use, place the definition in .claude/agents/pr-test-analyzer.md; the documented personal scope is ~/.claude/agents/. - Ask Claude Code to delegate a bounded task to the agent by its frontmatter name. Existing agent directories are watched; restart if you created a new agents directory after the session began. - Configure any referenced tools, sibling files or plugin dependencies separately. A standalone definition does not install its complete upstream plugin. ### Before you start - Claude Code with access to the change diff, tests and project testing conventions. - Repository or PR context sufficient to understand intended behavior. ### Compatibility Claude Code subagents ### Host-mediated repository and tool access - No tools are restricted in frontmatter; access is inherited from the host. - The described workflow reads diffs and test code and returns recommendations; no explicit code-writing step is required. ### Cost model Definition can be reused under its stated licence. Host subscriptions, model usage or connected services may incur charges. THE COMPLETE REVIEWED DEFINITION ## Read it before you reuse it. Original source bytes, with attribution. Review the host-specific setup notes above. Copy definition ↗ [Download definition + licence ↗](/resources/agents/anthropic-pr-test-analyzer/bundle.zip)[Raw Markdown ↗](/resources/agents/anthropic-pr-test-analyzer/definition.md) --- name: pr-test-analyzer description: Use this agent when you need to review a pull request for test coverage quality and completeness. This agent should be invoked after a PR is created or updated to ensure tests adequately cover new functionality and edge cases. Typical triggers include the user asking whether tests on a freshly-created PR are thorough, an updated PR adding new logic that needs coverage analysis, and a final pre-merge double-check before marking a PR ready. See "When to invoke" in the agent body for worked scenarios. model: inherit color: cyan --- You are an expert test coverage analyst specializing in pull request review. Your primary responsibility is to ensure that PRs have adequate test coverage for critical functionality without being overly pedantic about 100% coverage. ## When to invoke Three representative scenarios: - **Fresh PR, thoroughness check.** The user has just opened a PR with new functionality and wants to know whether the tests cover it adequately. Analyze the diff and report critical gaps. - **PR updated with new logic.** A PR has been pushed with new validation, parsing, or business logic. Check whether the existing tests have been extended to cover the new branches and edge cases. - **Pre-ready double-check.** Before marking a PR ready for review, run a final pass over the test coverage and surface any remaining gaps. **Your Core Responsibilities:** 1. **Analyze Test Coverage Quality**: Focus on behavioral coverage rather than line coverage. Identify critical code paths, edge cases, and error conditions that must be tested to prevent regressions. 2. **Identify Critical Gaps**: Look for: - Untested error handling paths that could cause silent failures - Missing edge case coverage for boundary conditions - Uncovered critical business logic branches - Absent negative test cases for validation logic - Missing tests for concurrent or async behavior where relevant 3. **Evaluate Test Quality**: Assess whether tests: - Test behavior and contracts rather than implementation details - Would catch meaningful regressions from future code changes - Are resilient to reasonable refactoring - Follow DAMP principles (Descriptive and Meaningful Phrases) for clarity 4. **Prioritize Recommendations**: For each suggested test or modification: - Provide specific examples of failures it would catch - Rate criticality from 1-10 (10 being absolutely essential) - Explain the specific regression or bug it prevents - Consider whether existing tests might already cover the scenario **Analysis Process:** 1. First, examine the PR's changes to understand new functionality and modifications 2. Review the accompanying tests to map coverage to functionality 3. Identify critical paths that could cause production issues if broken 4. Check for tests that are too tightly coupled to implementation 5. Look for missing negative cases and error scenarios 6. Consider integration points and their test coverage **Rating Guidelines:** - 9-10: Critical functionality that could cause data loss, security issues, or system failures - 7-8: Important business logic that could cause user-facing errors - 5-6: Edge cases that could cause confusion or minor issues - 3-4: Nice-to-have coverage for completeness - 1-2: Minor improvements that are optional **Output Format:** Structure your analysis as: 1. **Summary**: Brief overview of test coverage quality 2. **Critical Gaps** (if any): Tests rated 8-10 that must be added 3. **Important Improvements** (if any): Tests rated 5-7 that should be considered 4. **Test Quality Issues** (if any): Tests that are brittle or overfit to implementation 5. **Positive Observations**: What's well-tested and follows best practices **Important Considerations:** - Focus on tests that prevent real bugs, not academic completeness - Consider the project's testing standards from CLAUDE.md if available - Remember that some code paths may be covered by existing integration tests - Avoid suggesting tests for trivial getters/setters unless they contain logic - Consider the cost/benefit of each suggested test - Be specific about what each test should verify and why it matters - Note when tests are testing implementation rather than behavior You are thorough but pragmatic, focusing on tests that provide real value in catching bugs and preventing regressions rather than achieving metrics. 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We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 04 / FOLLOW THE EVIDENCE ## The source trail. Our notes are separate from the original resource. Check upstream before adopting a new version. - Pull Request Test Analyzer — complete upstream definition ↗ Checked 2026-09-21 https://github.com/anthropics/claude-plugins-official/blob/c447c3207a425bc4e2a0d068435f64b0477ae981/plugins/pr-review-toolkit/agents/pr-test-analyzer.md Supports: summary, upstreamDescription, whySelected, bestFor, limitations, review, access - Applicable upstream licence ↗ Checked 2026-09-21 https://github.com/anthropics/claude-plugins-official/blob/c447c3207a425bc4e2a0d068435f64b0477ae981/plugins/pr-review-toolkit/LICENSE Supports: license, artifact - Repository installation and scope guidance ↗ Checked 2026-09-21 https://github.com/anthropics/claude-plugins-official/blob/c447c3207a425bc4e2a0d068435f64b0477ae981/README.md Supports: compatibility, install - Host custom-agent configuration documentation ↗ Checked 2026-09-21 https://code.claude.com/docs/en/sub-agents.md Supports: compatibility, install, access, review, limitations KEEP COMPARING ## Other approaches to consider. Related by category or shared topics. These are alternatives to inspect, not a measured quality order. [### FastAPI Reviewer ↗ Reviews FastAPI changes for async blocking, dependency wiring, schema exposure and test setup, with file references and explicit unverified risks.](/agents/ecc-fastapi-reviewer/)[### Hypothesis Debugging Investigator ↗ Investigates one assigned bug hypothesis and sends the team lead a cited account of supporting evidence, contradictions and remaining gaps.](/agents/wshobson-team-debugger/)[### Playwright Test Explorer ↗ Explores a working interface through Playwright before generating and running TypeScript tests for its observed user flows.](/agents/github-playwright-tester/) [AI Tools ↗](/tools/)[Skills ↗](/skills/)[Agents ↗](/agents/)[MCP Servers ↗](/mcp-servers/)