# pr-diff

Returns file-level diff statistics for a pull request. Use full=true for patch/hunk content, or nameOnly=true for just the changed file paths.

Agent View of the PolicyLayer registry record for `pr-diff`. HTML page: https://policylayer.com/tools/io-github-dave-london-pare-test/pr-diff

## Facts

- Tool: `pr-diff`
- Server: Test (`Dave-London/Pare`) — https://policylayer.com/tools/io-github-dave-london-pare-test.md
- Homepage: https://github.com/Dave-London/Pare
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "pr-diff",
    "arguments": {}
  }
}
```

## Why pr-diff is rated Low

This is a read-only operation that queries and retrieves pull request diff information. It has no side effects—it does not create, modify, delete, or execute anything. The tool simply presents existing version control data in different formats (statistics, patches, or file names) based on parameters. The blast radius of misuse is minimal since it only exposes already-committed or proposed changes.

From the tool's own definition: "Tool returns file-level diff statistics and optionally patch/hunk content or file paths for pull requests. Keywords: 'Returns', 'diff statistics', 'file paths' indicate data retrieval with no modification or execution."

## Use case

AI agents call pr-diff to retrieve information from Test without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Test:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "pr-diff": {}
  }
}
```

## Other tools on Test (201)

- `branch` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/branch.md
- `clean` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/clean.md
- `package-clean` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/package-clean.md
- `remove` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/remove.md
- `reset` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/reset.md
- `secret-delete` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/secret-delete.md
- `stash` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/stash.md
- `tag` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/tag.md
- `variable-delete` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/variable-delete.md
- `workspace` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/workspace.md
- `worktree` — Destructive — https://policylayer.com/tools/io-github-dave-london-pare-test/worktree.md
- `add` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/add.md
- `add-package` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/add-package.md
- `ansible-galaxy` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/ansible-galaxy.md
- `ansible-playbook` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/ansible-playbook.md
- `api` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/api.md
- `apply` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/apply.md
- `bazel` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/bazel.md
- `biome-check` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/biome-check.md
- `bisect` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/bisect.md
- `black` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/black.md
- `build` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/build.md
- `bundle-exec` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/bundle-exec.md
- `check` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/check.md
- `cherry-pick` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/cherry-pick.md
- `clippy` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/clippy.md
- `cmake` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/cmake.md
- `compose-build` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/compose-build.md
- `compose-down` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/compose-down.md
- `compose-up` — Execute — https://policylayer.com/tools/io-github-dave-london-pare-test/compose-up.md
- …and 171 more: https://policylayer.com/tools/io-github-dave-london-pare-test.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-dave-london-pare-test · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-dave-london-pare-test