Single tool 'dynamic_openapi_tools' has critical definition gaps. Tool name is generic and does not follow verb_noun pattern (should be 'call_openapi_endpoint' or similar). Description is present but vague, does not explain WHEN to use it vs other tools, what prerequisites exist, or what the 'arguments' JSON format actually contains. Input schema exists but is severely underspecified: single 'arguments' string parameter with minimal guidance on structure. No output schema documented. No error handling guidance. Tool accepts arbitrary JSON, creating validation and injection risks.

• Rename tool to 'call_openapi_endpoint' or 'invoke_openapi_operation' to follow verb_noun pattern and signal action intent.
• Replace single 'arguments' string parameter with explicit typed parameters for each endpoint. Use JSON Schema with properties, required array, and type definitions. If dynamic, document the expected structure with examples and constraints.
• Document output schema in tool description: 'Returns {status_code: number, headers: object, body: any, elapsed_ms: number}' or equivalent. Specify pagination fields if applicable.
• Add input validation: check parameter names against OpenAPI spec, validate types, reject unknown parameters. Return actionable errors: 'Invalid parameter "user_id": expected integer, got string "abc"'.
• Implement error categorization: distinguish retryable (timeout, 429) from user-fixable (invalid param) from fatal (auth failure). Return recovery guidance: 'Invalid status code. Valid values: open, closed, pending.'