Walk TypeScript class/interface hierarchy: ancestors (what it extends/implements) and descendants (what extends/implements it). Use to understand inheritance trees. For a flat list of implementations only use get_implementations instead. Read-only. Returns JSON: { name, ancestors: [...], descenda...
AI agents call get_type_hierarchy 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 tool retrieves and queries type hierarchy information from source code without creating, modifying, deleting, or executing anything. It is a pure data retrieval operation that generates no side effects. The explicit 'Read-only' designation confirms it belongs in the Read category with low severity risk.
From the tool's definition Tool description explicitly states 'Walk TypeScript class/interface hierarchy', 'understand inheritance trees', and 'Read-only'. Returns JSON data structure with hierarchical information. No side effects or modifications.
Documented attack patterns abuse exactly the kind of access get_type_hierarchy 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_type_hierarchy:
{
"version": "1",
"default": "deny",
"tools": {
"get_type_hierarchy": {}
}
}get_type_hierarchy is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Walk TypeScript class/interface hierarchy: ancestors (what it extends/implements) and descendants (what extends/implements it). Use to understand inheritance trees. For a flat list of implementations only use get_implementations instead. Read-only. Returns JSON: { name, ancestors: [...], descendants: [...] }. 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_type_hierarchy: 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_type_hierarchy 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_hierarchy 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_hierarchy. 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_hierarchy 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.