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

Annotations declare a non-idempotent, open-world mutation, and the description usefully adds the consequence ('the answer is a new message in the chat') plus the blocking behavior ('follows the reply up to ~50 s'). That is real context beyond the annotations, though permission or rate-limit context is absent.

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?

One dense paragraph that leads with the action, then the exclusivity rule, then the effect and wait semantics, and ends with the endpoint. Every clause carries information; no filler.

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 write tool with no output schema, the description covers the key unknowns: what gets created, whether the call blocks, and how long. It does not describe the format of the returned reply, which is a minor gap against the ~50 s follow behavior it promises.

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 schema already documents option index origin, the 5000-char text limit, wait default, and the option/text exclusivity. The description largely repeats this, adding little that the schema does not already state, so the 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: answers a quick-reply widget from the agent's message, with two ways to answer (option index or free text). The parenthetical '(kind option)' hints at widget kinds and thus differentiates from the approval sibling only implicitly, so it is clear but not fully disambiguated.

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?

Usage context is implied ('from the agent's message') and the option-vs-text choice is described, but there is no explicit when-not guidance and muse_chat is referenced only as a behavioral parallel for waiting, not as an alternative to choose between. The agent must infer when this tool applies.

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