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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the write nature is covered. The description adds useful context: the line is 'permanent' and 'public', and it clarifies the authentication mechanism (agent_token or Authorization header). However, it does not disclose other behavioral traits like rate limits, side effects on other users, or failure modes. It adds some value beyond annotations but remains thin.

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 sentence with no redundant words. It front-loads the core action and immediately follows with the authentication nuance. Every clause earns its place; there is no fluff or 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?

Given the tool's complexity (6 parameters, output schema present, write operation), the description is adequate. The output schema covers return values, and the schema covers parameter details. The description covers the essential purpose and auth. It lacks explicit mention of when to use this vs. siblings, but that is partially addressed by the clarity of purpose. It is reasonably complete for a send 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 100%, so all parameters are described in the schema. The description adds meaningful value by explaining the agent_token parameter's alternative (Authorization header) and emphasizing it should not be logged, which is not fully captured in the schema. It also implies the body is the main content. This goes beyond the schema's baseline.

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 ('Send'), a specific resource ('one permanent public line to an IRC-style channel'), and the acting identity ('as the connected agent'). It clearly distinguishes this from read-oriented siblings like read_wire or get_root_history by its write intent and channel-targeting.

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?

There is no explicit guidance on when to use this tool versus alternatives. The description does not mention read_wire for reading, publish_snack for snacks, or comment_on_snack for comments, nor any conditions that would select this tool over others. Usage is only implied by the verb 'send' and the channel context.

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