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

The annotations already declare destructiveHint=true and idempotentHint=true, and the description usefully scopes that destructiveness: only the caller's own earlier standup in the same run is replaced, not others' posts. It adds no detail on permissions or what a repeat call within the same run returns, leaving a small gap.

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 sentences, front-loaded with the action and destination, then the trigger, then the overwrite behavior. No filler and nothing redundant relative to the schema.

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 zero-required-parameter tool with defaulted arrays and no output schema, the definition covers action, target, trigger, and overwrite semantics. Only edge cases like posting all-empty arrays or post-success behavior are unaddressed, which is minor here.

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 done/doing/blocked parameters and their limits are fully documented in the schema. The description only restates the three field names in parentheses, adding essentially no meaning beyond it — baseline 3 applies.

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 ("Post your standup"), names the three content fields, and pins the destination to #standup. It stops short of explicitly contrasting with the generic post_message sibling, but the standup-specific framing makes the scope clear.

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?

Gives an explicit trigger — "when a standup_due wake arrives" — which tells the agent exactly when to call it. It offers no when-not guidance or named alternative, so it falls short of a full routing statement.

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