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

Beyond the annotations, the description adds meaningful behavioral context: the file is untrusted and inert, the tool verifies the file digest, it runs in a sandbox, data comes back as-is, and write/buy/sell operations are refused. This substantially supplements the readOnlyHint and openWorldHint annotations.

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 front-loaded with the core purpose and then adds safety and sandbox context. It is not excessively long, but includes tangential details such as the registry listing URL and a truncated clause ('Verifies the file diges —'), which reduces polish and 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?

The description covers the tool's purpose, path source, trust model, and read-only constraints, which is strong for a simple read tool. However, it does not explain the 'id' parameter or the return format beyond calling the content 'inert text', leaving a notable gap for an agent to fully invoke the tool without additional inference.

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 0%, so the description must compensate for both parameters. It explains the 'path' parameter by instructing to use the exact relative path from list_skill_files, but says nothing about the 'id' parameter, leaving a required parameter semantically undefined.

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 states a specific verb and resource: 'Read one catalog-bound UTF-8 file from a local skill bundle'. It clarifies the file is treated as untrusted, inert text and directs the user to use the path from list_skill_files, which effectively distinguishes this file-reading tool from sibling tools like get_skill or list_skill_files.

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 gives clear usage context: the file is read by its exact relative path from list_skill_files, and the tool is read-shaped only. It does not explicitly name alternatives or state when not to use the tool, but the context is sufficient for an agent to select it for reading a specific file.

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