join_channel

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals that the server auto-joins the default channel on startup and that this tool is only a fallback. This is valuable context, though it doesn't mention edge cases like invalid channel names or side effects on the current channel.

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, well-structured sentence. It leads with the purpose ('Optional: switch...'), then adds conditional usage context. Every word earns its place, with no redundancy or filler.

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 simple tool with one optional parameter and no output schema, the description provides complete context: what it does, why it exists, and when to use it. The auto-join behavior and recovery scenario fully explain the tool's niche, leaving no major gaps.

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 schema covers 100% of the parameter, so the baseline is 3. The description adds some context (default channel name and recovery use case) but does not add new parameter-specific semantics beyond what the schema already states ('The name of the channel to join').

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 ('switch') and resource ('Figma communication channel'), clearly distinguishing it from all sibling tools. It also clarifies the tool's role relative to the default channel, leaving no ambiguity about what it does.

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?

Explicit guidance is given: the tool is optional, only needed for non-default channels or recovery after connection issues. It also explains the auto-join behavior, so the agent knows when to invoke it and when to avoid it. No alternatives are mentioned, but no real alternatives exist among sibling tools.

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