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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds the precise qualifying condition (completed/closed but uninvoiced) and the projected fields, but says nothing about result limits, pagination, or date-format 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 sentences, front-loaded with the core filter and followed by the return payload. No filler or restatement of the tool name.

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 read-only query with no output schema, describing the returned fields is valuable and annotations cover safety. The remaining gap is the undocumented parameter formats and any row-limit behavior, which is a minor but real omission.

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% for all three parameters. The description partially compensates by tying the filters together ('for ONE technician in a date range'), but it never clarifies date formats, whether from_date/to_date are optional, or the required technician identifier shape.

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 (retrieve) and resource (completed/closed jobs without invoices), with the defining scope constraint 'for ONE technician in a date range' that separates it from the workspace-wide sibling unbilled_completed_jobs. It also enumerates the returned fields, so an agent knows exactly what it gets.

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 single-technician scope and date-range framing imply when the tool applies, but there is no explicit 'use this instead of X when Y' routing against unbilled_completed_jobs or technician_jobs. Usage is inferable from scope rather than stated.

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