brain_check_staleness
AI agents call brain_check_staleness to retrieve information from Mcp Brain without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name indicates a checking/inspection function with no apparent side effects. It appears to retrieve or validate staleness status of project data without modifying or executing anything. Empty description lowers confidence slightly, but the naming pattern and sibling tools strongly suggest a read-only query.
From the tool's definition Tool name 'brain_check_staleness' suggests a read-only operation checking state/validity. Description is empty. Sibling tools like 'brain_check_conflicts', 'brain_check_patch', and 'brain_get_*' are clearly read operations, indicating this server's pattern.
Documented attack patterns abuse exactly the kind of access brain_check_staleness gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Brain, and nothing reaches the server without passing your rules. This is the rule we recommend for brain_check_staleness:
{
"version": "1",
"default": "deny",
"tools": {
"brain_check_staleness": {}
}
}brain_check_staleness is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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brain_check_staleness. It is categorised as a Read tool in the Mcp Brain MCP Server, which means it retrieves data without modifying state.
Register the Mcp Brain MCP server in PolicyLayer and add a rule for brain_check_staleness: 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 Brain. Nothing to install.
brain_check_staleness 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 brain_check_staleness 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 brain_check_staleness. 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.
brain_check_staleness is provided by the Mcp Brain MCP server (pierfrancescolijoi/mcp-brain). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Brain, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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21 Mcp Brain tools catalogued and risk-classified — across an index of 43,000+ MCP servers.