AI agents call fact_check to retrieve information from Proxima without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Fact-checking typically retrieves or validates information against data sources without creating, modifying, or deleting data. The sibling tools (academic_search, analyze_document, analyze_file, ask_*) are all read-only query operations, suggesting this server's tools are primarily for information retrieval. Empty description reduces confidence, but the name and context strongly suggest a Read classification.
From the tool's definition Tool name 'fact_check' indicates a querying/verification operation with no mutation capability. Description is empty, limiting confidence.
Documented attack patterns abuse exactly the kind of access fact_check gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proxima, and nothing reaches the server without passing your rules. This is the rule we recommend for fact_check:
{
"version": "1",
"default": "deny",
"tools": {
"fact_check": {}
}
}fact_check is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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fact_check. It is categorised as a Read tool in the Proxima MCP Server, which means it retrieves data without modifying state.
Register the Proxima MCP server in PolicyLayer and add a rule for fact_check: 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 Proxima. Nothing to install.
fact_check 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 fact_check 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 fact_check. 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.
fact_check is provided by the Proxima MCP server (zen4-bit/proxima). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 50 Proxima tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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50 Proxima tools catalogued and risk-classified — across an index of 42,500+ MCP servers.