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

The description goes beyond annotations by detailing side effects: invoke works even if MCP not installed, returns connect/checkout links for auth/payment, and writes require admin. This aligns with readOnlyHint=false and provides concrete behavioral expectations for a mutating tool.

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 lengthy, repetitive run-on paragraph with no clear structure. It reuses the same concepts multiple times (e.g., list_tools, subscribe, install) and mixes action guidance with security notes, making it hard to scan. This significantly reduces clarity despite the rich content.

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?

The description covers many scenarios: core flow, one-off vs permanent usage, auth/payment edge cases, admin permissions, and the prompt library. It provides substantial context for a complex tool, though it omits details on specific parameters and some action-specific behaviors, so it is not fully complete.

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 coverage, the description must compensate, but it only mentions a few action names without defining the specific parameters (e.g., cancel_reason, prompt_vars, arguments). The high-level narrative does not map to the actual parameter list, leaving most fields unexplained.

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 marketplace's dual purpose as a catalog of MCPs/tools and a way to run them, and it distinguishes between actions like search, describe, invoke, and install. It differentiates from sibling tools by focusing on discovery and execution, though the long, repetitive text somewhat buries the core purpose.

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 provides explicit guidance on when to use invoke vs install (prefer invoke for one-off, install for permanent), and when list_tools is relevant. It also mentions credential and payment handling, giving practical context. However, it does not compare directly to sibling auth/connect tools, and the guidance is scattered within a paragraph.

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