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

Beyond the minimal annotations, the description reveals critical behaviors: invoke runs tools one-off without installing, returns connect/checkout links when needed, and writes require owner/admin. It also discloses the tool's role in managing prompts. No contradiction with annotations found.

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 long but information-dense, covering many actions and edge cases. It follows a logical flow (core flow → key exceptions → permissions → prompt library), though it is a single block of text without formatting. Every sentence adds substantive guidance.

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 complex hub tool with 14 actions and 23 params, the description covers discovery, invocation, installation, billing, permissions, and prompt library behavior. It lacks explicit detail on some actions like resume and some parameters, but overall it provides enough context for an agent to effectively use the tool in most cases.

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 0% schema description coverage, the description compensates for the core parameters (action, query, mcp_id, tool_id, arguments) and prompt-related macros, but many fields like limit, immediate, tier_slug, and various request/prompt metadata are left unexplained. It provides meaning for the most important params but not the full surface.

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 central catalog and execution hub for MCPs and tools. It uses specific verbs (search, describe, invoke, install) and provides a concrete core flow, distinguishing it from siblings like authenticate or connect.

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 explicitly differentiates when to use invoke vs install: 'Use install only to make an MCP PERMANENT in the active toolkit... prefer invoke for a single/occasional use.' It also explains the retry flow for credential/payment links and notes that writes require workspace owner/admin, giving clear situational guidance.

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