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

Discloses key behaviors: invoke works without installation, returns connect/checkout links for auth/payment, and flags that install/uninstall/subscribe/cancel are writes requiring owner/admin. This exceeds the annotation readOnlyHint=false and destructiveHint=false by adding concrete side-effect details.

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 excessively long, repetitive, and poorly punctuated. It repeats phrases like 'the in-platform catalog of every MCP/tool' and 'AND the way to run them' and 'USE' structures redundantly. The lack of paragraphs or bullet points makes it hard to scan.

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?

While it covers the core flow and edge cases (auth, payment, ownership), it omits details on output formats, error handling, parameter combinations, and specific behaviors for less common actions like 'report_bug' or 'request_mcp'. It is adequate for an overview but not fully complete for a complex 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 23 parameters and zero schema descriptions, the description must compensate, but it only vaguely references actions (e.g., 'action', 'mcp_id') without mapping each parameter. It does not explain 'arguments', 'immediate', 'tier_slug', 'prompt_*' fields, or how they relate to the actions. The narrative flow does not provide per-parameter semantics.

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 states the tool's role as the official mcp.ai marketplace, covering both MCPs and prompts. It explicitly mentions the catalog, execution, and distinct actions (search, describe, invoke, install, etc.), making the purpose unambiguous.

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 guidance on when to use each action: invoke for one-off use, install for permanent, and describes the search→describe→invoke flow. Also explains prompt usage and distinguishes between MCPs and prompts, covering when to prefer invoke over install.

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