log_rest_day

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

The description conflicts with the annotation by declaring the operation idempotent while the annotation sets idempotentHint to false. This contradiction undermines transparency. Additionally, it does disclose side effects like suppressing workout-prompt nudges, but the contradiction is a major issue.

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?

The description is moderately long but well-structured with clear paragraphs and a bullet point for inference rules. There is minor repetition, but it remains concise and easy to parse.

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?

The description covers when to use, how to infer the date, the effect on workout nudges, idempotency, and the alternative cancellation tool. It provides all necessary context for the tool's functionality.

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?

The schema already documents the 'date' parameter with format and default, but the description adds crucial inference rules for parsing user references like 'today' and 'yesterday,' going beyond the schema.

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?

The description clearly states the tool's purpose with the verb 'Mark' and the resource 'date as an intentional rest day.' It also provides usage examples, making the action unambiguous.

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?

It explicitly specifies when to use the tool ('Use when the user says they took a rest day...') and directs users to the sibling tool 'cancel_rest_day' for removal, leaving no ambiguity about when to choose this tool.

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