tummy_times_update_tummy_time

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

With no annotations present, the description carries the behavioral disclosure burden. It does disclose a key behavior: only provided fields are changed, which prevents the agent from assuming unspecified fields are cleared or reset. It does not cover not-found behavior, permissions, or explicit null-value handling, but the core partial-update semantics are useful.

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 two short, purposeful sentences. The key partial-update behavior is front-loaded, and there is no filler or redundant restating of the tool name.

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 5-parameter update tool with full schema coverage and an output schema, the description conveys the essential semantics: update by ID and change only provided fields. It could mention not-found behavior or how null updates are interpreted, but these are secondary given the output schema and parameter descriptions.

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 description coverage is 100%, so the baseline is 3. The description adds value beyond the schema by clarifying that omitting optional fields leaves them unchanged rather than applying the schema's default of null, which is important for correct partial updates.

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 states a specific action ('Update') and a specific resource ('an existing tummy time record'), clearly distinguishing it from the create/list/delete tummy time siblings. 'Only provided fields are changed' further clarifies that this is a partial update rather than a replace-all operation.

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 phrase 'existing tummy time record' implies the tool is for modifying an already-created record and not for creating new ones. However, it never explicitly names alternatives like tummy_times_create_tummy_time or states conditions when the tool should not be used.

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