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

Beyond the annotations, the description discloses important behaviors: invoke works even when the MCP is not installed, one-off installs do not bloat the toolkit, auth/payment failures return connect or checkout links that require retry, and writes require owner/admin. It also explains installed_in_toolkit vs installed_in_workspace flags and the prompt library's login-free share links, adding substantial non-obvious context.

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 lengthy, but this is largely justified by the tool's 14 distinct actions and complex invoke/install distinction. It is organized by core flow, key behavior, usage preference, auth, and prompt library, and almost every sentence adds needed information; a little repetition and the single long paragraph prevent a perfect score.

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 tool's high complexity, 23 parameters, and no output schema, the description covers the essential workflow, auth/ownership requirements, billing interactions, retry logic, and the prompt library sub-system. It does not fully specify return value shapes for search/list_tools or detail all parameter combinations, but it provides enough context for a capable agent to navigate the tool.

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?

With 0% schema coverage, the description carries significant burden and does clarify the meaning of action, mcp_id/tool_id, invoke behavior, and prompt-related parameters. However, many parameters remain unexplained—limit, immediate, tier_slug, cancel_reason, cancel_comment, conversation, request_details, prompt_targets, and several others—leaving gaps an agent would need to guess at.

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 the marketplace as the official MCP/tool catalog and execution runner, with a core search → describe → invoke flow plus prompt library functions. It distinguishes itself from siblings by naming the platform and explaining its unique multi-action role, though the purpose is spread across many actions rather than a single verb+resource.

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?

The description gives explicit guidance: prefer invoke for one-off use, use install only when permanent toolkit membership is desired, use request_mcp when nothing fits, and use list_tools to see what is callable now. It also states when writes require owner/admin and how credentials/payment link flows work, making alternatives and conditions clear.

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