Get previously detected communities (file clusters). Run detect_communities first. Read-only. Returns JSON: { communities: [{ id, files, size }], total }.
AI agents call get_communities to retrieve information from Trace without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward data retrieval operation that queries cached results of community detection. It has no side effects, modifies no state, and poses minimal risk—a misused agent could at worst spam queries or retrieve information about code structure that should be visible to authorized users anyway.
From the tool's definition Tool description explicitly states 'Read-only' and 'Returns JSON' with community metadata. The operation retrieves previously detected data without modification, creation, or execution.
Documented attack patterns abuse exactly the kind of access get_communities gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Trace, and nothing reaches the server without passing your rules. This is the rule we recommend for get_communities:
{
"version": "1",
"default": "deny",
"tools": {
"get_communities": {}
}
}get_communities is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get previously detected communities (file clusters). Run detect_communities first. Read-only. Returns JSON: { communities: [{ id, files, size }], total }. It is categorised as a Read tool in the Trace MCP Server, which means it retrieves data without modifying state.
Register the Trace MCP server in PolicyLayer and add a rule for get_communities: 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 Trace. Nothing to install.
get_communities 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 get_communities 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 get_communities. 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.
get_communities is provided by the Trace MCP server (nikolai-vysotskyi/trace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 178 Trace tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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178 Trace tools catalogued and risk-classified — across an index of 42,500+ MCP servers.