Live transit service alerts & line status from connected GTFS-RT transit feeds — answer "is my line/service disrupted right now?". Coverage varies by agency as feeds are wired in; lines or services with an active alert are listed first. Use only_issues=true to cut to active disruptions. Args: que...
Risk signalsAccepts freeform code/query input (query)
Part of the Dynamic Feed server.
Free to start. No card required.
AI agents call transit_status to retrieve information from Dynamic Feed without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though transit_status only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"transit_status": {}
}
}See the full Dynamic Feed policy for all 50 tools.
These attack patterns abuse exactly the kind of access transit_status gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Live transit service alerts & line status from connected GTFS-RT transit feeds — answer "is my line/service disrupted right now?". Coverage varies by agency as feeds are wired in; lines or services with an active alert are listed first. Use only_issues=true to cut to active disruptions. Args: query: match a line/system/description (e.g. "victoria", "detour"). system: filter by transit system/agency. city: filter by city. only_issues: only lines/services with an active alert. limit: max results.. It is categorised as a Read tool in the Dynamic Feed MCP Server, which means it retrieves data without modifying state.
Register the Dynamic Feed MCP server in PolicyLayer and add a rule for transit_status: 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 Dynamic Feed. Nothing to install.
transit_status is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the transit_status 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 transit_status. 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.
transit_status is provided by the Dynamic Feed MCP server (https://dynamicfeed.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 50 Dynamic Feed 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.