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

Goes well beyond the annotations: it discloses the batch ceiling of 100 per call, that the response partitions succeeded from failed postings, the idempotent no-op case, and that postings the monitor does not hold are echoed back and left untouched. The cost note (~20 tokens per posting) is a rare and genuinely useful operational disclosure for an agent planning batch sizes.

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?

Three labelled, front-loaded sentences (Purpose / When / Cost), each carrying distinct information with no repetition of the title or schema.

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?

An output schema exists and the description still usefully signals that it splits decided from failed results; combined with the batch, idempotency and cost notes, an agent has everything needed to size and interpret a call correctly.

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 enum meanings, the 1-100 bound and the monitorId source are already documented in structured fields. The description's 'up to 100 postings at once' and 'put postings back' restate the maxItems and the 'open' enum value rather than adding new semantics, so 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 ('Record what the user did with postings a monitor found, or put postings back') and scopes it to monitor postings, which cleanly separates it from monitor_create/update/list/get and the job_postings_* siblings. An agent can identify the operation 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?

The explicit 'When: After the user says what they did with a posting, or wants a decided posting back' gives a concrete trigger condition. It does not name an alternative tool or an exclusion case, so it stops short of a 5.

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