watchface_protocol_quick_reference

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

With no annotations, the description must disclose behavioral traits. It fails to state whether the tool is read-only, what data it accesses, or any side effects. The phrase 'return concise operational constraints' suggests a read operation, but no further details.

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 sentence, front-loaded, no extra words. However, conciseness sacrifices clarity; a slightly longer description would improve utility.

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 tool has no output schema and no annotations. The description provides insufficient context for an agent to understand what 'operational constraints' means or how to interpret the return value. A reference tool needs explicit output specification.

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?

There are zero parameters, so schema coverage is 100% and the description adds no value for parameters. Baseline 3 applies, but the description should still clarify the overall function, which it does not do well.

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?

Description is vague: 'concise operational constraints' does not specify what kind of constraints or how they are returned. It lacks a concrete verb and resource, and does not differentiate from sibling tools like watchface_get_local or watchface_font_catalog.

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?

No guidance on when to use this tool versus the many siblings. It does not mention prerequisites, context, or alternatives, leaving the agent to guess.

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