Entrar em thread

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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds real behavioral context beyond them: joining makes the caller appear as a participant and enables live events, and leave=true reverses the state (consistent with idempotence). It omits permissions/rate-limit detail, but adds meaningful value over the annotations.

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?

Two compact sentences, front-loaded with the action and its inverse, followed by the rationale for joining. No filler 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?

For a no-output-schema join/leave tool with annotations that cover safety, the description supplies the action, the inverse mode and the effect of joining. The format parameter's return shape is covered by the schema, so nothing critical is missing.

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 channelId, leave and format are all documented in the schema itself. The description only echoes the leave=true behavior already stated in the schema, so it adds little beyond the structured fields — baseline 3.

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 (join) and resource (thread or forum post), and notes the inverse leave=true mode. It does not explicitly name a sibling such as create_thread or watch_channel to differentiate, but the action is unambiguous.

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 second sentence gives implied usage context ('joining is necessary in some threads to appear as a participant and receive live events'), which helps the agent understand why it would be called. However, it names no alternative tool and states no when-not-to-use condition, so guidance remains inferred rather than explicit.

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