React to an IRC message

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

Annotations already declare readOnlyHint=false and destructiveHint=false. The description adds the dual add/remove behavior and clarifies that the message is identified by msgid. However, it does not disclose edge cases such as reaction idempotency or permission requirements.

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 succinct sentence that front-loads the verb and resource. Every word adds value, and there is no unnecessary repetition.

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 tool with 5 parameters and no schema descriptions, this description is too brief. It fails to explain important parameters like target and account, and the output schema does not compensate for the missing parameter semantics. The description is insufficient for correct invocation in many contexts.

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?

With 0% schema description coverage, the description carries the burden of explaining parameters. It explains msgid's role and the add/remove action, but leaves target, account, and the remove flag semantics largely undefined. This incomplete guidance forces guesswork.

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 ('Add or remove'), the resource ('emoji reaction on a message'), and the identifier ('msgid'). This specific phrasing distinguishes it from sibling tools like send_message or send_raw.

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 provides clear context for reacting to a message, but it does not explicitly mention when to prefer this tool over alternatives like send_raw or send_message. No exclusions or alternative tool names are given.

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