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

Annotations already cover readOnly, idempotent, non-destructive and closed-world, and the description adds what they cannot: it is a public catalog requiring no sign-in, and it discloses the return shape (actions[] with action_id, action_name, action_description, fields_for_action_details). Minor remaining gaps are pagination and whether the action list can be empty for an unknown serviceId.

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?

Front-loads the purpose, then the request body, then the return shape, then usage sequencing, then an auth note. It is dense with useful detail rather than padded, though the inline JSON body snippet is slightly noisy for a single documented parameter.

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 one-parameter read tool with no output schema, the description covers everything an agent needs: where the ID comes from, the exact body shape, the returned fields, why to call it, and that no authentication is required.

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% and there is only one parameter, so the baseline would be 3; the description adds real meaning by stating the value must come from search_apps and showing the camelCase body format, which the schema's thin "e.g. rowbu58rc" description does not convey.

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?

States a specific verb and resource ("List what an app can do for the user") and immediately makes it distinguishable from siblings by tying it to the search_apps → list_app_actions → run_app_action sequence. The concrete examples (Gmail "Send Email", Sheets "Add Row") make the resource granularity unambiguous.

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?

Explicit sequencing guidance: get serviceId from search_apps, call this to pick the matching action, then connect or run. It implicitly names the alternative (run_app_action) and prerequisite (search_apps) but states no explicit when-not or failure condition for skipping this step.

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