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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions 'optional duration' but does not explain side effects (e.g., status auto-clearing), permission requirements, or whether the status is persistent. The write nature is implied but not elaborated.

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 a single, front-loaded sentence that communicates the essential purpose without waste. Every word adds meaning, earning a perfect score for conciseness.

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 simple 3-parameter tool with no annotations or output schema, the description provides a minimum viable overview. It misses parameter semantics and behavioral details, but the core action is clear. It is adequate but falls short of being comprehensive.

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 0%, so the description must compensate. It references 'emoji' and 'optional duration' which map to status_emoji and duration_minutes, but it does not explain the format for the emoji (e.g., ':smile:') or the meaning of duration (e.g., minutes until expiration). status_text is not even explicitly mentioned, only implied by 'status'.

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 verb ('set') and resource ('Slack status'), clearly distinguishing it from sibling tools like send_slack_message or reply_slack. It also identifies key characteristics (emoji, optional duration) that define the tool's scope.

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 description does not explicitly mention when to use this tool versus alternatives, but the purpose is self-evident and distinct from messaging tools. The usage context is implied by the nature of setting a Slack status; however, no exclusions or alternative guidance are provided.

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