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

With no annotations, the description carries full burden. It discloses that partial failures are reported per-id rather than aborting, and implies a write operation. It could mention idempotency behavior or permissions but still adds meaningful behavioral context beyond the schema.

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 concise sentences: first states the main action, second lists required inputs with constraints, third explains failure handling. No unnecessary words, front-loaded with purpose.

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?

Given no output schema, the description covers the key behavioral detail (per-id results, partial failures). It could mention the return format or idempotency behavior for completeness, but it is adequate for a simple bulk update tool.

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 baseline is 3. The description repeats the purpose of 'ids' and 'text' but adds little beyond schema, such as the ownership constraint for ids. It does not elaborate on 'idempotency_key' behavior. No significant added value for parameters.

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?

Clearly states the action 'apply a common text description update to multiple of your own time entries'. The verb 'apply' and resource 'time entries' are specific. It distinguishes from siblings like 'update_time_report' (single) and 'bulk_create_time_reports' (create vs update) by highlighting the bulk update nature and ownership scope.

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 description provides clear context for when to use (batch updating own time entries with same description) and the required inputs. However, it does not explicitly state when not to use or suggest alternatives like single-update tools, which is acceptable given sibling names but not excellent.

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