[ts-morph] Return the TypeChecker-inferred type at a specific position in a TypeScript/JavaScript file, plus the symbol and its declaration location. When to use - Quickly verifying
AI agents call get_type_at_position_by_tsmorph to retrieve information from MCP ts-morph Refactoring Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only inspection tool that queries TypeScript's type checker for information about a specific code location. It retrieves and returns type metadata without modifying code, executing external operations, or causing any side effects. Even if misused by an AI agent, the worst outcome is returning incorrect type information for analysis purposes, with no blast radius on the codebase or external systems.
From the tool's definition Tool 'get_type_at_position_by_tsmorph' returns type information at a specific code position. Description states it 'Return[s] the TypeChecker-inferred type' with 'symbol and its declaration location' — purely retrieval operations with no mutations or side…
Documented attack patterns abuse exactly the kind of access get_type_at_position_by_tsmorph gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP ts-morph Refactoring Tools, and nothing reaches the server without passing your rules. This is the rule we recommend for get_type_at_position_by_tsmorph:
{
"version": "1",
"default": "deny",
"tools": {
"get_type_at_position_by_tsmorph": {}
}
}get_type_at_position_by_tsmorph is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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[ts-morph] Return the TypeChecker-inferred type at a specific position in a TypeScript/JavaScript file, plus the symbol and its declaration location. When to use - Quickly verifying. It is categorised as a Read tool in the MCP ts-morph Refactoring Tools MCP Server, which means it retrieves data without modifying state.
Register the MCP ts-morph Refactoring Tools MCP server in PolicyLayer and add a rule for get_type_at_position_by_tsmorph: 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 ts-morph Refactoring Tools. Nothing to install.
get_type_at_position_by_tsmorph 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_type_at_position_by_tsmorph 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_type_at_position_by_tsmorph. 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_type_at_position_by_tsmorph is provided by the MCP ts-morph Refactoring Tools MCP server (sirosuzume/mcp-ts-morph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP ts-morph Refactoring Tools, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
8 MCP ts-morph Refactoring Tools tools catalogued and risk-classified — across an index of 43,000+ MCP servers.