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

The description adds substantial behavioral detail beyond annotations: writes require workspace owner/admin, invoke runs one-off without bloating the toolkit, auth failures return a connect link, payment failures return a checkout link, and prompt links open without login. There is no contradiction with the provided 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 block of text, but nearly every sentence earns its place. The core flow is front-loaded and the key invoke/install distinction is highlighted, though bullet points or paragraph breaks would improve scannability.

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 23 parameters, no output schema, and minimal annotations, this description is unusually complete: it covers the main action flow, auth and payment edge cases, permanent vs one-off installs, and the prompt library. Minor gaps remain for actions like resume and params like immediate or tier_slug, preventing a perfect score.

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 description coverage, the description carries most of the parameter meaning: action=search/describe/invoke, mcp_id and tool_id in the flow, and prompt_vars/prompt_slug/publish behavior. It does not explain every parameter, but it adds strong semantic value for the core action-based parameters.

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.ai catalog and execution layer for MCPs, with a concrete search→describe→invoke flow and a separate prompt-library area. It distinguishes itself from sibling tools by positioning itself as the in-platform hub rather than a specific authentication, connection, or single-MCP tool.

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?

It gives explicit guidance on when to use invoke vs install: 'prefer invoke for a single/occasional use' and 'Use install only to make an MCP PERMANENT.' It also names fallbacks like list_tools for currently callable tools and request_mcp for when nothing fits, making the selection logic clear.

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