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

Beyond the annotations (which state no fully read-only hint), description discloses that invoke can execute uninstalled MCPs temporarily, actions may require owner/admin for writes, and invoke may return connect or checkout links requiring user action. This is significant behavioral detail not otherwise known, and consistent 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 dense and front-loaded with the main flow, but it packs a lot into long sentences, making it challenging to parse. Though every part adds value, lack of structure (no bullets or clear sections) reduces scannability; still, it's not wasteful.

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?

Given the high complexity (14 actions, prompt library) and no output schema, the description covers each action's function, clarifies core flows, and addresses install vs. invoke. However, lacks specifics on return formats or how certain params like limit, immediate, or conversation are used, leaving some minor gaps for an agent.

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?

Although schema coverage is 0%, the description explains many parameters implicitly (action, mcp_id, tool_id, arguments, and prompt-related ones) by describing workflows of search, describe, invoke, and prompt operations. It does not detail every param like limit, immediate, or cancel_reason, but covers the core ones.

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?

Clearly identifies the tool as the marketplace for MCPs with multi- faceted functionality (search, describe, invoke, install). Distinguishes its role in the MCP ecosystem and differentiates from sibling tools by specifying its scope (in-platform catalog and execution).

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?

Explicitly explains core flow (search → describe → invoke) and distinguishes single-use invoke from permanent install, including when to use each. Directs to list_tools for current callable tools and mentions subscribe/cancel for billing, providing clear guidance against using alternatives.

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