WATCHER: get a signed callback when a new US Federal Register document is published. Arm once, pay once. Optionally filter by type (RULE / PRORULE / NOTICE / PRESDOCU), agency (slug, e.g. environmental-protection-agency), and/or keyword in the title. Fires once per new document (deduped by docume...
AI agents use watchers.federal-register to create or update resources in Mcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp environment.
An AI agent can call watchers.federal-register faster than any human can review — one bad instruction and it creates or modifies resources in Mcp by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
WATCHER: get a signed callback when a new US Federal Register document is published. Arm once, pay once. Optionally filter by type (RULE / PRORULE / NOTICE / PRESDOCU), agency (slug, e.g. environmental-protection-agency), and/or keyword in the title. Fires once per new document (deduped by document number); bounded by maxFires/expiry. Existing docs at arm time are baselined. Free public-domain dat. It is categorised as a Write tool in the Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MCP server in PolicyLayer and add a rule for watchers.federal-register: 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 Mcp. Nothing to install.
watchers.federal-register 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 watchers.federal-register 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 watchers.federal-register. 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.
watchers.federal-register is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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