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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=true, so the mutation/safety profile is covered structurally. The description usefully adds the required auth scope, which the annotations do not convey. However, with destructiveHint=true on an update tool, the description should warn what can be destroyed or overwritten, and it does not.

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, zero filler, with the resource and ID framing front-loaded ahead of the prerequisite. Nothing wastes the agent's attention.

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 14-parameter mutation tool with no output schema, the description covers identity and auth but omits update semantics (partial vs full replacement, handling of unspecified fields) and any confirmation of what is returned. Annotations cover safety, so the gap is moderate rather than severe.

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 100% across all 14 parameters, so the schema already documents each field, including enum values and UUID formats. The description adds no parameter meaning beyond that, so the baseline 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?

States a specific verb and resource ('Update an existing project task') plus the key by-ID selector, which cleanly distinguishes it from create_project_task, delete_project_task, and get_project_task. It doesn't explicitly name a sibling alternative, but the CRUD-family naming makes the role 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?

The only guidance is the scope requirement ('Requires project_tasks:write scope'). There is no statement of when to use this versus bulk_update or the other project_task mutators, and no mention of partial-update expectations for callers who want to change just one field.

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