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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, covering the safety profile. The description adds that a default field set is returned, which usefully implies the output can be narrowed, but it says nothing about rate limits, auth, or error behavior for the crates.io API.

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?

Front-loaded with the registry and action, which is good, but the two field lists overlap heavily (description, keywords, categories appear in both sentences), creating redundancy. The trailing clify_run parenthetical is useful but tacked on.

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?

There is no output schema, so the description's enumeration of default return fields does real work. It is nearly complete for a read-only fetch, with the main gap being the undocumented limit parameter.

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?

Schema coverage is 67%: name and fields are documented in the schema, while limit is undocumented in both places. The description's list of default return fields indirectly explains what the fields parameter filters, but it adds no syntax for limit or the fields syntax beyond the schema's '"*" for all'.

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?

Specific verb and resource ("Get a crate's details") with the registry named up front ("crates.io"), which cleanly distinguishes it from the near-sibling pypi__get-package. It also enumerates the kind of data returned, so the agent knows the shape without opening a schema.

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 parenthetical "(Same as clify_run site=crates command=get-crate)" points at an equivalent access path but gives no condition for choosing this tool over clify_run or pypi__get-package. Usage is only implied, with no when/when-not guidance.

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