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

With no annotations, the description carries the burden and does so well: it enumerates the exact checks, declares determinism ('caller supplies the reference date - fully deterministic, no LLM'), and states a policy stance ('never suggests inflating hours'). It does not explicitly state that the tool is side-effect-free/non-mutating, which would close the last gap.

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?

Single dense paragraph, front-loaded with purpose followed by enumerated checks and return shape — every clause earns its place. It is long, but the length is justified by the check inventory.

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 spells out the return contract (pass/warnings/blocked verdict, per-entry violations with fixes, hour totals by author and date). Determinism and entry cap (via schema) round it out; only the non-mutating guarantee is left implicit.

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 schema already documents today, policy overrides, and the entries shape in detail. The description adds only the default rounding increment (0.25h) and the semantics of a few checks, which is marginal value over the schema. 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 ('run a batch of worklog entries through configurable guardrails') plus the operational scope ('BEFORE posting to a time-tracking system'). No sibling tool covers worklog validation, so it is trivially distinguishable from the lint/validator family.

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?

Clearly conveys the usage moment — pre-posting validation of timesheet entries — which tells an agent when this belongs in a workflow. It stops short of naming an alternative or exclusion, so it is not a full 5.

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