trw_code_index_update · Trw MCP: Risk & Policy

WHAT IT DOES

What trw_code_index_update does on Trw

AI agents use trw_code_index_update to create or update resources in Trw — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Trw environment.

WHY IT NEEDS A POLICY

Why trw_code_index_update needs a policy

The '_update' suffix indicates reversible modification (Write category) rather than deletion (Destructive) or irreversible operations. In the context of a persistent engineering memory system, updating an index would create or modify searchable metadata about the codebase.

From the tool's definition Tool name 'trw_code_index_update' indicates modification of a code index. The description is empty, limiting certainty, but 'update' strongly suggests non-destructive modification of indexed data structures used for engineering memory and development…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

trw_code_index_update Rate-limited

trw_code_index_update stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "trw_code_index_update": {
      "limits": [
        {
          "counter": "trw_code_index_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Trw, so you can run agents against it safely.

FAQ

Questions about trw_code_index_update

What does the trw_code_index_update tool do? +

trw_code_index_update. It is categorised as a Write tool in the Trw MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on trw_code_index_update? +

Register the Trw MCP server in PolicyLayer and add a rule for trw_code_index_update: 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 Trw. Nothing to install.

What risk level is trw_code_index_update? +

trw_code_index_update is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit trw_code_index_update? +

Yes. Add a rate_limit block to the trw_code_index_update 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 trw_code_index_update completely? +

Set action: deny in the PolicyLayer policy for trw_code_index_update. 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 trw_code_index_update? +

trw_code_index_update is provided by the Trw MCP server (wallter/trw-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.