# get_render_summary

Returns a summary of re-renders grouped by component name with counts. Use groupBy:

Agent View of the PolicyLayer registry record for `get_render_summary`. HTML page: https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/get-render-summary

## Facts

- Tool: `get_render_summary`
- Server: Why Did You Render (`0x1f320/why-did-you-render-mcp`) — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp.md
- Homepage: https://github.com/0x1f320/why-did-you-render-mcp
- 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": "get_render_summary",
    "arguments": {}
  }
}
```

## Why get_render_summary is rated Low

This tool retrieves and summarizes existing performance metrics about React component re-renders. It queries data to help diagnose performance issues but does not modify, delete, or execute any code. The use case is purely diagnostic and observational, with no capability to change system state or trigger external operations.

From the tool's own definition: "The tool 'Returns a summary of re-renders grouped by component name with counts' indicates data retrieval with no modification or side effects."

## Use case

AI agents call get_render_summary to retrieve information from Why Did You Render 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 Why Did You Render:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_render_summary": {}
  }
}
```

## Other tools on Why Did You Render (13)

- `clear_renders` — Destructive — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/clear-renders.md
- `delete_snapshot` — Destructive — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/delete-snapshot.md
- `pause_renders` — Execute — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/pause-renders.md
- `wait_for_renders` — Execute — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/wait-for-renders.md
- `compare_snapshots` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/compare-snapshots.md
- `get_commits` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/get-commits.md
- `get_projects` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/get-projects.md
- `get_renders` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/get-renders.md
- `get_renders_by_commit` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/get-renders-by-commit.md
- `get_tracked_components` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/get-tracked-components.md
- `list_snapshots` — Read — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/list-snapshots.md
- `resume_renders` — Write — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/resume-renders.md
- `save_snapshot` — Write — https://policylayer.com/tools/0x1f320-why-did-you-render-mcp/save-snapshot.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=0x1f320-why-did-you-render-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/0x1f320-why-did-you-render-mcp