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

No annotations are provided, so the description should carry the burden. It only says 'List' and 'Free,' which implies a read-only operation but does not disclose auth requirements, side effects, ordering, or error behavior. 'Free' is ambiguous and adds little behavioral context.

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 core sentence is short and clear. The stray 'Free.' is unnecessary and could be confusing, but it does not significantly detract from the overall concise structure.

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 list operation with one parameter and an output schema, the description is minimally viable. However, it lacks usage guidance, any behavioral context, and does not fully leverage the schema to clarify parameters, so it is complete enough only for a straightforward agent.

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 description coverage is 0%, so the description must compensate for parameter documentation. It does not mention project_guid at all, though the name is self-explanatory and the phrase 'in the project's backend' loosely implies the parameter's purpose. Still, formatting or validation details are missing.

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 clearly states a specific verb and resource: list files in the project's backend. It distinguishes itself from read_backend_file (content of a file) and write_backend_file, though it does not explicitly name these sibling alternatives.

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?

There is no guidance about when to use this tool versus alternatives like read_backend_file or list_projects. The description provides no context for selecting this over similar tools or exclusions for when not to use it.

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