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

Annotations already establish the safety profile (readOnly, non-destructive, closed-world), so the bar is lower. The description adds value beyond that by disclosing what a caller gets back: each file's size, and flags identifying binary files and the main document, which is meaningful pre-call context given there is no output schema.

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?

One sentence, front-loaded with the verb and resource, with no redundant or filler phrasing. Every clause (size, binary marking, main document) conveys distinct information.

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 simple read-only listing tool with full annotation coverage, the description is nearly sufficient: it explains what a call returns, which matters because no output schema exists. It does not mention whether results are paginated or ordered, a minor remaining gap for a tool that claims to list "every file".

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?

There is a single parameter with 100% schema description coverage, and the schema already explains that project_id comes from list_projects. The description adds no further semantics for that parameter, so the baseline of 3 applies.

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 gives a specific verb and resource ("Lists every file in a project") plus the scope of what is returned (size, binary marking, main document), which separates it from list_projects and from search tools. It stops short of naming a sibling it is not, so it is clear but not maximally differentiated.

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 exhaustive wording "every file in a project" implies the intended use: getting a complete inventory rather than a filtered search or a single read. There is no explicit when-to-use/when-not guidance, no mention of alternatives like search or read_file, and no stated prerequisites beyond the id coming from list_projects.

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