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 genuinely new behavior information: that omitted project_id widens the scope to the entire server workspace and that returned paths are relative to the project — a non-obvious output nuance. It stops short of noting any listing limits or pagination.

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 sentences, zero waste, with the scoping rule front-loaded ahead of the optional-parameter explanation. Nothing is repeated or padded.

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?

With only two well-documented parameters, full annotation coverage, and an output schema handling return values, the description covers nearly everything an agent needs. A minor gap remains around whether the listing recurses into subdirectories or has any size/limit behavior.

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 both parameters are already documented, and the description's explanation of project_id largely restates the schema text. The one added nuance is the contrast between project-relative and whole-workspace listing, which is the baseline-plus credit for a fully covered schema.

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 uses a specific verb+resource ('List paths in the server's workspace') and immediately scopes the behavior via project_id, so an agent knows exactly what this returns. It does not explicitly name a sibling tool to differentiate from (e.g., list_projects or read_file), which keeps it just short of a 5.

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?

It gives a concrete conditional rule: pass project_id for one project's folder, omit it for the whole workspace. However, it offers no guidance on when to reach for this tool versus alternatives like list_projects, list_servers, or read_file — usage is implied rather than stated against the sibling set.

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