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

The description goes far beyond the annotations by disclosing side effects: invoke runs a tool without adding it to the toolkit, install makes it permanent, writes require workspace owner/admin, and payment/credential flows return connect/checkout links. The openWorldHint and readOnlyHint are consistent with the described behavior; no contradictions.

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 well-structured with a core flow and a KEY callout. Each sentence adds meaningful context about capabilities, usage, or side effects. Minor stylistic quirks (e.g., 'pontualmente') and emphasis capitalization slightly affect polish, but the density is justified given the tool's complexity.

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 hub tool with 14 actions, 23 parameters, and no output schema, the description is remarkably complete. It covers discovery, execution, installation, billing, permissions, and the prompt library. It omits only minor details (e.g., the exact semantics of action 'resume') and does not describe return structures, but it is far more complete than typical.

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 carries heavy responsibility. It explains the pivotal action enum, mcp_id, tool_id, arguments, and prompt-related parameters. However, several parameters like cancel_reason, immediate, report_context, and conversation are not explicitly described, though their names and enums provide some inference.

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 in-platform catalog of MCPs/tools and the way to run them. It enumerates the core actions (search, describe, invoke, install, prompt library) and distinguishes itself from sibling tools like authenticate, connect, and receita_pj_qsa_consultar by scope and function.

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?

Excellent usage guidance: it explicitly says when to use invoke vs install (prefer invoke for one-off, install for permanent), when to use search/describe, list_tools, subscribe/cancel, report_bug, and request_mcp. It also explains edge cases like credential/connect links and checkout flows, leaving little ambiguity about tool selection.

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