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

The description adds the required scope ('project_time_entries:write'), which is genuinely useful context beyond annotations. However, annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, so the agent knows it is a non-idempotent write; the description does not expand on side effects, validation failures, or duplicate handling.

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, purpose front-loaded followed by the scope precondition. No filler.

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 9-param create tool with no output schema, the description is minimal: it covers the operation and auth scope but omits creation semantics, required-field interactions, and default behavior for optional fields. It is adequate but leaves notable gaps.

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%, so baseline 3 applies. The description adds nothing about the 9 parameters, including the unusual relationship between optional time fields (start_time required, end_time optional vs. duration_minutes optional), which would have been helpful.

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+resource ('Create a new project time entry'), clearly distinguishing it from siblings like create_project_task or create_project_team_member. It does not name an alternative operation (e.g., bulk_create, update_project_time_entry), but the resource is 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?

No when-to-use or when-not-to-use guidance is given. With siblings like bulk_create, update_project_time_entry, and delete_project_time_entry present, the description leaves the agent to infer that this single-entry creation path is the right one.

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