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

The description goes well beyond the sparse annotations. It discloses that invoke works even for uninstalled MCPs, returns connect/checkout links for auth/payment, and that writes require workspace owner/admin. It also explains the one-off install behind invoke and the behavior of search/describe regarding installed status.

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 long, dense paragraph that packs substantial information, but lacks structural breaks or lists. It is front-loaded with the main purpose, yet the run-on format makes it harder to scan. Every sentence contributes, but the structure could be improved with bullets or sections.

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?

Despite no output schema and high complexity, the description covers the main flows, authorization requirements, edge cases (connect/checkout links), and the prompt library. It does not thoroughly describe return formats for all actions, but the core behavior is well covered for a tool of this scale.

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 must compensate for parameter understanding. It explains the roles of key parameters like action, mcp_id, tool_id, and arguments through the action flow, but many parameters (e.g., immediate, tier_slug, prompt_vars, prompt_targets, cancel_reason) remain undocumented in both schema and description.

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 tool as the official mcp.ai marketplace, a catalog and execution engine for MCPs, and outlines the core search/describe/invoke flow. It distinguishes this from sibling tools by naming the prompt library and explicit workflow, 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?

Explicit guidance is given: prefer invoke for one-off use, use install for permanent toolkit additions, and list_tools shows what is callable now. It also clarifies when to use subscribe/cancel, report_bug, and request_mcp, providing clear decision-making criteria.

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