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

Goes well beyond the annotations by disclosing external side effects the agent could not infer: completion may fan out 'job completed' notifications via email/SMS/webhook to managers, technicians or the customer depending on account configuration. It also warns about a partial-failure mode (provider refusing a call with only one timestamp) and the XOR identifier rule, which the schema does not encode.

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-loaded with the operation class and action, then ordered by importance: optional timestamp contract, notification side effects, identifier selection, endpoint. Every clause carries information an agent needs; nothing is padding.

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?

No output schema exists, yet the description still covers the effect of the call, the notification fallout, the identifier constraint, the timestamp pairing rule and the underlying endpoint — everything needed to invoke a 5-parameter write tool with only the identifiers being optional.

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 the baseline is 3, but the description adds semantics the schema omits: the mutually-exclusive identifier rule across id/my_id/num and the pairing requirement for actual_start/actual_end. The timestamp format itself is already in the schema, so no further credit there.

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 ('mark a job as completed') and prefixes it with the operation class ('WRITE:'), which immediately separates it from read-side siblings like get_job and from the adjacent lifecycle tools start_job/schedule_job. An agent can tell what this does without opening the schema.

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?

Gives concrete invocation conditions: identify the job by exactly one of id, my_id or num, and supply actual_start/actual_end together because Synchroteam may refuse a lone timestamp. It stops short of naming alternatives (e.g. start_job vs complete_job) or stating when completing is inappropriate, so it is clear context without explicit exclusions.

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