join_channel

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

No annotations are provided, so the description carries the full burden of explaining side effects, permissions, idempotency, or state changes. The description only says 'Join a specific channel' and gives no indication of what happens when joining, whether it is reversible, whether authentication is required, or what observable effects occur.

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 clauses, making it concise and easy to parse. The phrase 'specific' is slightly filler-like, but overall the structure is clean and front-loaded with the action.

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 one optional parameter, no output schema, no annotations, and a tool that is disjoint from the many sibling node/manipulation tools, the description is too thin for an agent to understand when or how to call it. It does not explain what channels exist, where the channel name comes from, what a successful join looks like, or what conditions cause failure.

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% with a parameter description ('The name of the channel to join'), so the schema already handles the basic meaning. The tool description adds no extra information about channel format, naming rules, valid values, or how to discover available channels. Baseline 3 is appropriate since the schema does the heavy lifting.

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 concrete action ('Join a specific channel') and identifies the resource (a channel), but the purpose is vague: 'to communicate with Figma' does not explain what joining the channel accomplishes, what a channel is in this context, or how this relates to the other Figma tools. It is not a tautology, but it lacks enough specificity to be fully clear.

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 no guidance on when to use this tool, what problem it solves, or which situations warrant joining a channel. It does not mention any prerequisites, exclusions, or alternatives. An agent has no context to decide when this tool is the right choice.

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