Get the timetable/schedule for a specific Muni line. Args: - line_id: Route/line ID (e.g. 'N', '14', '38R') - operator_id: Optional (default 'SF')
Part of the BART Real-Time Transit server.
Free to start. No card required.
AI agents use muni_schedule to create or modify resources in BART Real-Time Transit. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call muni_schedule repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach BART Real-Time Transit.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"muni_schedule": {
"limits": [
{
"counter": "muni_schedule_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full BART Real-Time Transit policy for all 8 tools.
These attack patterns abuse exactly the kind of access muni_schedule gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Get the timetable/schedule for a specific Muni line. Args: - line_id: Route/line ID (e.g. 'N', '14', '38R') - operator_id: Optional (default 'SF'). It is categorised as a Write tool in the BART Real-Time Transit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the BART Real-Time Transit MCP server in PolicyLayer and add a rule for muni_schedule: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches BART Real-Time Transit. Nothing to install.
muni_schedule is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the muni_schedule rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for muni_schedule. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
muni_schedule is provided by the BART Real-Time Transit MCP server (https://muni-mcp.srivastsh.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 BART Real-Time Transit tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.