5 tools. 2 can modify or destroy data without limits.
2 write tools that can modify data. Rate limits recommended.
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Execute tools (ExecuteQuery, ExecuteRangeQuery) trigger processes with side effects. Builds, notifications, workflows — all fired without throttling.
GetAvailableWorkspaces:
rules:
- rate_limit: 60/minute Controls API costs and prevents retry loops from exhausting upstream rate limits.
The Prometheus MCP Server server is primarily read-only with 3 read tools. While it cannot modify data, an agent in a retry loop can make thousands of API calls per minute, exhausting rate limits and running up costs. Rate limiting is still recommended.
5 tools across 2 categories: Execute, Read. 3 are read-only. 2 can modify, create, or delete data.
One line change. Instead of running the Prometheus MCP Server server directly, prefix it with Intercept: intercept -c prometheus-mcp-server.yaml -- npx -y @awslabs.prometheus-mcp-server. Download a pre-built policy from policylayer.com/policies/prometheus-mcp-server and adjust the limits to match your use case.
Starter policies available for each. Same risk classification, same one-command setup.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.