12 tools. 1 can modify or destroy data without limits.
1 write tool that can modify data. Rate limits recommended.
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Execute tools (no_stop_departures) trigger processes with side effects. Builds, notifications, workflows — all fired without throttling.
Intercept sits between your agent and Public Transport. Every tool call checked against your policy before it executes — so your agent can do its job without breaking things.
npx -y @policylayer/intercept scan -- npx -y @mirodn/mcp-server-public-transport be_get_departures:
rules:
- rate_limit: 60/minute Controls API costs and prevents retry loops from exhausting upstream rate limits.
The Public Transport server is primarily read-only with 11 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.
12 tools across 2 categories: Execute, Read. 11 are read-only. 1 can modify, create, or delete data.
One line change. Instead of running the Public Transport server directly, prefix it with Intercept: intercept -c mirodn-mcp-server-public-transport.yaml -- npx -y @mirodn/mcp-server-public-transport. Download a pre-built policy from policylayer.com/policies/mirodn-mcp-server-public-transport and adjust the limits to match your use case.
Starter policies available for each. Same risk classification, same one-command setup.
Set budgets, approvals, and hard limits across MCP servers.
npx -y @policylayer/intercept init