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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint, so restating "read-only" adds nothing. The description discloses no pagination behavior, no return granularity, no auth/permission requirements despite openWorldHint, leaving real behavioral gaps for a multi-param read.

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 compact sentences with zero filler, and the core action is front-loaded ahead of the limitations note. Efficient and readable.

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 GET tool with annotations covering the safety profile and no output schema, this is minimally adequate, but it omits the timecard's contents/granularity and gives no routing against the several sibling timecard tools, which is the main thing an agent needs.

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 63% with 8 params and 0 required, and the description compensates only partially by flagging user_id/from/to as typically required — the three schemaless params (to, from, user_id) lack type/format detail. Baseline 3 is appropriate since the schema already documents the auth-related params.

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 ("Gets a user's timecard") and even names the backing endpoint GET /timecards. It is clear what the tool does, though it does not distinguish itself from close siblings like list_timecards or generate_timecard.

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?

"typically requires user_id, from and to" implies the calling context, which is useful, but there is no explicit when-to-use guidance and no mention of the obvious alternatives (list_timecards, get_timecards_count, export_timecards) that a selecting agent must choose between.

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