moveSymbol · Ts MCP: Risk & Policy

WHAT IT DOES

What moveSymbol does on Ts

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

WHY IT NEEDS A POLICY

Why moveSymbol needs a policy

An AI agent can call moveSymbol faster than any human can review — one bad instruction and it creates or modifies resources in Ts by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

moveSymbol Rate-limited

moveSymbol 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": {
    "moveSymbol": {
      "limits": [
        {
          "counter": "movesymbol_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 Ts, so you can run agents against it safely.

FAQ

Questions about moveSymbol

What does the moveSymbol tool do? +

Move top-level declarations (functions, classes, types, constants) to another file. Automatically rewires all imports across the project. If the target file does not exist, tsserver creates it. It is categorised as a Write tool in the Ts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on moveSymbol? +

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

What risk level is moveSymbol? +

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

Can I rate-limit moveSymbol? +

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

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

moveSymbol is provided by the Ts MCP server (ts-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.