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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds non-annotation context that matters: it is free, exposes no customer data, and critically 'No call submits a job or spends funds,' which reassures an agent about financial side effects.

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?

Three compact sentences, front-loaded with the free-discovery scope. It is not padded, though the middle sentence ('separate processing authentication and activation limits') is slightly garbled and costs a little clarity.

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?

With no output schema, the description must convey returns, and it does: 'four paid prices in USDC, inspection networks, ... authentication and activation limits.' Combined with the no-funds/no-job guarantees and full annotation coverage, this is nearly complete for a zero-parameter discovery call.

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?

The tool takes zero parameters and schema coverage is 100%, so the baseline is 4. There are no arguments to describe, and the description correctly does not invent any.

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?

States a specific verb+resource: 'Free discovery of Skavio paid MCP tools, prices, and networks.' This distinguishes it from the sibling tools (audio_transcribe, pdf_merge, etc.), which are the paid tools being catalogued, so an agent can tell it is the discovery entry point rather than a worker.

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?

Usage is implied rather than stated: 'Free discovery' and 'No call submits a job or spends funds' hint that this should be called before committing to a paid tool, but there is no explicit 'use this when/not' or named alternative. The reader must infer the routing.

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