say_in_chat

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

With no annotations provided, the description carries the full burden. It states the prerequisite but does not disclose behavior on failures (e.g., unpaired device, missing chat control) or side effects. The write nature is implied but not explicitly stated.

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 extremely concise: one sentence for purpose, one for prerequisite, then a bullet list of args. It is front-loaded with the core action and contains no unnecessary words.

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?

Given the output schema exists (return value info not needed) and tool simplicity, the description covers the prerequisite and parameter meanings. It could mention error handling or that it's a write operation, but it is adequate for selecting and invoking the tool.

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 coverage is 0%, so the description must compensate. It fully explains both parameters: 'text: The message to send' and 'sender_name: Display name to send as (default 'Claude')'. This adds meaning beyond the schema's type and default.

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 clearly states the action: 'Post a message into a layout's channel chat control as the LLM'. It specifies the verb 'post', the resource 'message into a layout's channel chat control', and the role 'as the LLM'. No sibling tool shares this purpose, so it is well-distinguished.

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 includes a clear prerequisite: 'Requires a paired device showing a chat control'. This guides when to use the tool. However, it does not explicitly mention when not to use it or compare to alternative tools like 'read_chat'.

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