Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes far beyond annotations by disclosing that writes require workspace owner/admin, that invoke runs without installing the MCP, and that it returns connect/checkout links with a retry workflow. It also explains the permanent vs. one-off semantics of install. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a dense, single paragraph that is long but every sentence adds value. It could be improved with bullet points or section breaks for the different action groups (MCP discovery, invocation, prompt library), but it remains highly informative.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers the main flow, edge cases (auth, payment, permissions), the prompt library, and the distinction between invoke and install. Lacks explicit return-format details and leaves some actions like 'resume' unexplained, but given the tool's complexity and lack of output schema, it is remarkably complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description explains the central 'action' parameter and its values in detail, and adds meaning to tool_id, arguments, prompt_vars, etc. through the workflow narrative. However, with 23 parameters and 0% schema coverage, some parameters like limit, query, cancel_reason enums, and resume are not explicitly described.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly identifies this as the mcp.ai marketplace catalog and execution engine, with an explicit core flow (search → describe → invoke). It enumerates all sub-actions and distinguishes the tool from sibling Open Finance/auth tools by stating its specific role.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides explicit when-to-use guidance: prefer invoke for one-off runs, use install for permanent toolkit additions, and list_tools for currently callable tools. It also explains the core discovery flow and what to do when credentials or payment are needed.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.