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Grok Bot+18 agentsPR Change & Risk Writer
Turn a branch diff into a factual PR brief: changes, risks, test needs, unknowns, and rollback signals.
Free
PR Change & Risk Writer
Example session with this skill installed
Write a reviewer-ready PR brief from this diff summary:
src/api/users.ts:GET /users/:idnow returns 404 instead of{ user: null }src/client/user.ts: client now throwsUserNotFoundErroron 404tests/user-api.test.ts: new 404 test added- no UI tests changed
Do not invent intent or claim tests passed unless the evidence supports it.
- Read your context and instructions
- Compiled the pr change
- Generated the document
PR CHANGE & RISK BRIEF
Summary
This change makes "user not found" explicit at the API boundary. The API now returns HTTP 404, and the client converts that response into UserNotFoundError.
What changed
- Changed the not-found API contract from a successful response containing
user: nullto HTTP 404. - Updated the client wrapper to translate 404 into a typed error.
- Added API-level coverage for the new 404 behavior.
Why / intent
Supported: The code consistently moves not-found behavior to an explicit error path.
Inferred: The likely intent is to make absence easier to distinguish from successful empty data.
Unknown: Whether all callers are prepared for the new exception behavior.
Affected behavior
- API consumers expecting
200 + user: null. - Client callers that previously handled a nullable user.
- UI flows that may not catch
UserNotFoundError.
Risk map
| Risk | Evidence | What to verify |
|---|---|---|
| Unhandled client exception | Client now throws on 404 | Check all call sites for error handling |
| External API compatibility | Response contract changed | Confirm external consumers or versioning |
| UI regression | No UI tests changed | Exercise not-found user flows |
Test status
Visible in diff: API 404 case.
Still needed: Client caller/UI behavior for UserNotFoundError.
Not verified: External consumer compatibility.
Reviewer focus
- Search all client call sites for assumptions that user may be null.
- Verify whether the API is public or versioned.
- Confirm UI behavior for missing users.
Merge / rollback signals
Block merge if: Existing callers cannot handle UserNotFoundError.
Rollback / stop if: Not-found traffic begins producing uncaught client errors.
Suggested PR description
Changes user-not-found handling from 200 + null to an explicit 404 response and maps that response to UserNotFoundError in the client. Adds API-level coverage for the 404 case.
Before merge, verify downstream callers and UI flows that previously handled a nullable user.
What would change this assessment
- Evidence that the API is internal and all callers were updated elsewhere.
- Existing UI coverage for the new typed error path.
pr-change-risk-writer.pdf
PDF · document
Example file from a real run - the skill writes it into your workspace.
Connects securely to your tools. The creator never sees your data.
About this skill
Turn a code diff into a PR a reviewer can actually trust.
Most AI PR writers are good at making changes sound complete. That is also the problem: a diff can show what changed without proving why it changed, whether it is safe, whether tests passed, or whether downstream callers are ready.
PR Change & Risk Writer produces a factual review brief from the code that actually changed.
What it does
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Identifies the real center of the change instead of narrating every file equally.
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Separates observed code changes from inferred intent and unknown context.
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Maps changed behavior, public interfaces, data paths, configuration, dependencies, and operational surfaces.
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Highlights concrete risks only where the diff supports them.
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Shows reviewers where attention has the highest value.
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Separates tests visible in the diff from tests that are still needed or not verified.
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Flags claims such as “no breaking changes,” “fully tested,” or “safe migration” when the evidence does not support them.
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Defines merge blockers and rollback or stop signals when the change warrants them.
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Produces a clean, copy-ready PR description at the end.
Use it when
- a branch has grown too large to summarize manually
- a PR description needs to be factual instead of promotional
- reviewers need to know where the real risk is
- an API, schema, auth, dependency, migration, retry, or state path changed
- you need to distinguish actual test evidence from assumed coverage
- a generated PR description sounds polished but may be overstating what the diff proves
What you get
- Factual summary
- What changed
- Supported vs inferred intent
- Affected behavior
- Risk map
- Test status
- Reviewer focus
- Merge / rollback signals
- Copy-ready PR description
- What would change the assessment
Why it is different
A diff is evidence of change, not proof of intent or safety. This skill keeps those layers separate so reviewers spend less time checking claims the PR description should never have made.
Known limitations
The skill cannot prove production safety, backward compatibility, test success, or business intent from a diff alone. It explicitly marks those gaps when the supporting evidence is missing.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
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- 3
Ask your agent to use it
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