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EvalGate agent tool access

EvalGate provides a Tool API that is not a standards-conformant MCP server.
The existing /api/mcp/tools and /api/mcp/call routes are an authenticated, HTTP Tool API (legacy/internal) for direct integrations. Do not add them to Cursor, Claude Desktop, or another MCP client configuration. Use Authorization: Bearer YOUR_API_KEY to discover and call the read-only eval.quality.latest, eval.get, and eval.list tools. Write operations are disabled by default. Operator opt-in with EVALGATE_TOOL_API_WRITES=true and Required write scopes enables the internal mutation tools; keep the flag disabled for read-only integrations. The tier is limited to 100,000 requests per day. A future MCP integration will be documented only after its transport, authorization, approval, and compatibility contracts are available.