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

The description goes well beyond the annotations' readOnly/idempotent/destructive hints: it discloses that invoke executes a one-off run WITHOUT installing the MCP or bloating the tool list, that writes require workspace owner/admin, and that install/uninstall/subscribe/cancel are the profile-changing operations. The credential/pricing behavior (returns a connect link or checkout link, then retry) is context that predictions alone cannot provide.

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 but every sentence earns its place, and there is no filler or redundancy. It loses a point for being one continuous wall-of-text: the three distinct topic areas (core MCP flow, one-off execute/install trade-off, prompt library) would scannability, but it remains appropriately sized for a 23-action, 23-param tool.

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?

For a tool with 23 parameters, no output schema, and 14 enum actions, the description covers the most important behavior: the search→describe→install loop, the one-off execution contract (install persistence), permissions, billing, and message description. Lingering gaps: parameter-level details for query, limit, message, and immediate are not spelled out, and the output contract for a few actions is only implied.

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?

Schema description coverage is 0%, so the description must compensate. It does for the most by explaining action=search/describe/invoke semantics, the mcp_id + tool_id + arguments trio, the prompt_* parameter family, and the cancel flow. However, a full subset of unexplained params relevant to some actions still need mapping.

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 is explicit: 'the in-platform catalog of every MCP/tool, AND the way to run them', with the core flow search→describe→invoke and a separate prompt-library feature. This is a specific, resource-bound purpose statement that clearly distinguishes the marketplace from sibling tools like authenticate, show_version, and toolkit_info.

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 when/when-not guidance: 'Use install only to make an MCP PERMANENT... prefer invoke for a single/occasional use', 'list_tools lists what is callable right now', and request_mcp for building a NEW MCP when nothing fits. It also covers the credential and payment edge flows by telling the agent to relay connect/checkout links and retry after the user acts.

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