brain_predict_files

THE RISK

Low Risk

Why brain_predict_files needs a policy

The naming pattern and context strongly suggest this tool retrieves or predicts file-related information without modifying state. The 'predict' verb typically indicates analysis or forecasting rather than side effects. However, the empty description prevents full confidence.

From the tool's definition Tool name 'brain_predict_files' suggests retrieval or querying of predictive file information. The tool is grouped with other 'brain_*' tools that are primarily read-oriented (brain_get_context, brain_get_decisions, brain_get_git_snapshot,…

Documented attack patterns abuse exactly the kind of access brain_predict_files gives an agent:

POLICY

How to control brain_predict_files

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_predict_files:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "brain_predict_files": {}
  }
}

brain_predict_files is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Brain — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about brain_predict_files

What does the brain_predict_files tool do? +

brain_predict_files. It is categorised as a Read tool in the Mcp Brain MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on brain_predict_files? +

Register the Mcp Brain MCP server in PolicyLayer and add a rule for brain_predict_files: 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.

What risk level is brain_predict_files? +

brain_predict_files is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit brain_predict_files? +

Yes. Add a rate_limit block to the brain_predict_files 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.

How do I block brain_predict_files completely? +

Set action: deny in the PolicyLayer policy for brain_predict_files. 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.

What MCP server provides brain_predict_files? +

brain_predict_files 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.

Enforce policy on every Mcp Brain tool call.

Start from Mcp Brain, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →