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

With no annotations, the description carries the behavioral disclosure burden. It usefully discloses that this endpoint is not a WebSocket and returns only the latest messages. It does not mention authentication requirements, pagination, rate limits, or the response envelope, though the read-only nature is strongly implied by 'history' and 'latest messages'.

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?

A single compact sentence that front-loads the resource and scope and adds the WebSocket qualifier without filler. Every word earns its place.

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 one-parameter read-only history tool, the description covers the core behavior and the non-WebSocket nature. However, with no output schema, it does not describe the shape of the returned messages or whether auth is required. This leaves moderate gaps for an agent 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?

The input schema already documents channel_id as 'ID do canal no iptv-org' with 100% coverage. The description adds no parameter-level detail, but none is required given the schema's clarity. Baseline 3 is appropriate.

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 the tool returns the latest messages of a channel's chat room, which is a specific resource and scope. It avoids tautology and the parenthetical '(sem WebSocket)' helps distinguish it from a real-time messaging path. However, it lacks an explicit verb like 'returns' and does not name a sibling alternative.

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 phrase '(sem WebSocket)' implies this is the non-WebSocket/polling way to fetch recent chat messages, giving some context on when to call it. It does not explicitly state when to prefer chat_send, clear_history, or a WebSocket connection, nor any exclusions. Usage guidance is therefore only implied.

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