AI agents call github_search to retrieve information from Brain without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Tool names ending in 'search' and the context of a cognitive-indexing server strongly suggest this retrieves/queries data without side effects. However, the empty description creates ambiguity—it could potentially search for and return GitHub data, or it could execute GitHub API calls. Lower confidence assigned due to missing descriptive text.
From the tool's definition Tool name contains 'search', and the parent server is described as indexing conversation history into 'searchable embeddings'. The sibling tool 'bob_search' further confirms this server provides search functionality.
Documented attack patterns abuse exactly the kind of access github_search gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Brain, and nothing reaches the server without passing your rules. This is the rule we recommend for github_search:
{
"version": "1",
"default": "deny",
"tools": {
"github_search": {}
}
}github_search is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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github_search. It is categorised as a Read tool in the Brain MCP Server, which means it retrieves data without modifying state.
Register the Brain MCP server in PolicyLayer and add a rule for github_search: 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 Brain. Nothing to install.
github_search 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 github_search 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 github_search. 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.
github_search is provided by the Brain MCP server (mordechaipotash/brain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from 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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34 Brain tools catalogued and risk-classified — across an index of 43,000+ MCP servers.