AI agents call brain_check_patch 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 'check' verb combined with the pattern of sibling check/get tools indicates this likely reads or validates patch data without modification. However, confidence is moderate (0.6) due to absent description. If the tool actually modifies patches or executes patch application logic, this classification would shift to Execute or Write respectively.
From the tool's definition Tool name 'brain_check_patch' suggests a checking/validation operation. No description provided to assess actual behavior.
Documented attack patterns abuse exactly the kind of access brain_check_patch 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_patch:
{
"version": "1",
"default": "deny",
"tools": {
"brain_check_patch": {}
}
}brain_check_patch 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_patch. 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_patch: 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_patch 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_patch 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_patch. 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_patch 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.