Detect mismatches between API spec and implementation: endpoints in spec but not in code, or in code but not in spec. Use to verify API contract accuracy. For reading the contract itself use get_api_contract instead. Read-only. Returns JSON: { service, missingInCode, missingInSpec, total }.
AI agents call get_contract_drift 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 analyzes contract drift information from existing API specifications and implementations. It is a diagnostic/query operation that detects discrepancies but does not create, modify, or delete any data. The explicit 'Read-only' designation confirms no write or destructive operations occur. Low severity because misuse would at worst generate incorrect analysis output without affecting systems.
From the tool's definition Tool description explicitly states 'Read-only' and performs detection/verification of API specification mismatches. Returns JSON data without modifying anything: { service, missingInCode, missingInSpec, total }. No side effects on code or configuration.
Documented attack patterns abuse exactly the kind of access get_contract_drift 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_contract_drift:
{
"version": "1",
"default": "deny",
"tools": {
"get_contract_drift": {}
}
}get_contract_drift is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Detect mismatches between API spec and implementation: endpoints in spec but not in code, or in code but not in spec. Use to verify API contract accuracy. For reading the contract itself use get_api_contract instead. Read-only. Returns JSON: { service, missingInCode, missingInSpec, total }. 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_contract_drift: 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_contract_drift 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_contract_drift 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_contract_drift. 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_contract_drift 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.