# 429 Throttle MCP server

Agent View of the PolicyLayer registry record for 429 Throttle: identity, probed posture, risk grade, and all 5 tools classified. HTML page: https://policylayer.com/tools/429-throttle-mcp

## Facts

- Server id: `429-throttle-mcp`
- Install: `npx -y 429-throttle-mcp`
- Homepage: https://www.npmjs.com/package/429-throttle-mcp
- Registry record: grade B, identity unverified
- Lifecycle: active
- Rate-limited: no
- Tools: 5
- Tool categories present: Read, Write
- Tags: 429 throttle mcp
- Record last modified: 2026-10-10T09:09:03.585Z

## Tools (5)

| Tool | Category | Risk | Record |
| --- | --- | --- | --- |
| `begin_task` | Read | Low | https://policylayer.com/tools/429-throttle-mcp/begin-task.md |
| `call_api` | Read | Low | https://policylayer.com/tools/429-throttle-mcp/call-api.md |
| `end_task` | Read | Low | https://policylayer.com/tools/429-throttle-mcp/end-task.md |
| `get_rate_limit_status` | Read | Low | https://policylayer.com/tools/429-throttle-mcp/get-rate-limit-status.md |
| `set_rate_limit` | Write | Medium | https://policylayer.com/tools/429-throttle-mcp/set-rate-limit.md |

## Tool descriptions

- `begin_task` — 开始一个限流观测任务区间，返回 taskId。长任务开始前调用，结束后用 end_task 取复盘报告（用时/调用次数/原定用时/第几轮并发会超时）。
- `call_api` — 通过限流代理发送 HTTP 请求。所有外部 API 调用建议经此工具。 参数：url（必填）/ method（可选，默认 GET）/ body（可选，JSON 字符串或对象）/ headers（可选，JSON 字符串或对象）。 返回：API 响应内容 + 速率限制用量快照。被限流时返回 RATE_LIMIT_EXCEEDED 及建议等待秒数； 单次请求超过每分钟 token 总额时返回 REQUEST_EXCEEDS_WINDOW（等待无效，需减小请求体）。 仅允许 h…
- `end_task` — 结束 begin_task 开启的区间，返回本次任务复盘：实际用时、调用次数、被限流次数、原定串行用时、以及按给定并发度第几轮会触顶。
- `get_rate_limit_status` — 查询当前速率限制使用情况。返回已用/剩余调用次数和 Token 数、建议与统计。
- `set_rate_limit` — 动态调整速率限制参数（实时生效无需重启）。callsPerMinute / tokensPerMinute 可选。 注意：非正数会被拒绝；callsPerMinute > ${SAFE_CALLS_MAX} 或 tokensPerMinute > ${SAFE_TOKENS_MAX} 属于超大值， 可能触发上游平台真实限流，首次调用会返回 needsConfirmation，需带 confirm=true 再次调用确认。

## 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`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=429-throttle-mcp · API: https://policylayer.com/registry/api · Recommended policies for every tool: https://policylayer.com/policies/429-throttle-mcp