recall · Metis Public Health MCP: Risk & Policy

WHAT IT DOES

What recall does on Metis Public Health

AI agents call recall to retrieve information from Metis Public Health without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why recall needs a policy

The name 'recall' and the pattern of sibling write/storage tools strongly imply read-only retrieval of indexed or stored data without modification. The tool description is empty, lowering confidence slightly, but the semantic context (memory system, research companion, local data) clearly positions this as a Read operation. No destructive, executable, or financial operations are indicated.

From the tool's definition Tool name 'recall' paired with sibling tools like 'add_memory_entry', 'add_journal_entry', and 'add_glossary_term' suggests retrieval of stored information.

Attacks that exploit this kind of access

Questions about recall

What does the recall tool do? +

recall. It is categorised as a Read tool in the Metis Public Health MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on recall? +

Register the Metis Public Health MCP server in PolicyLayer and add a rule for recall: 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 Metis Public Health. Nothing to install.

What risk level is recall? +

recall is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit recall? +

Yes. Add a rate_limit block to the recall 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.

How do I block recall completely? +

Set action: deny in the PolicyLayer policy for recall. 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.

What MCP server provides recall? +

recall is provided by the Metis Public Health MCP server (sveritg/metis_ph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.