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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds one useful piece of behavior, that the returned text is the author's manuscript, but says nothing about size limits, truncation, or errors for missing ids.

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?

Two short sentences, front-loaded with the verb and resource, with no filler. Every clause contributes something: what is returned, how the id is obtained, and what the text represents.

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 tool is simple (one required parameter), annotations cover safety, an output schema exists for return values, and the description notes the text is the full manuscript. Only the absence of sibling differentiation and edge-case behavior keeps it below a 5.

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 100%, so the baseline would be 3, but the description goes beyond the schema by stating the id must be one that search returned rather than an arbitrary identifier, which is real added meaning. It adds nothing else about format, since there is only one string parameter.

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?

Names a specific verb and resource ("Returns the full text of one file") and scopes the id to a search result, so it reads clearly as a retrieve-by-id tool. It does not differentiate itself from same-family siblings such as read_file, so an agent cannot tell those apart from the description alone.

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 phrase "by the id search returned" gives implied workflow guidance: run search first, then fetch. There is no explicit when-to-use/when-not, no statement about prerequisites, and no comparison to read_file, which is the closest alternative in the sibling list.

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