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 explaining behavior. It only states the action and purpose but does not disclose side effects, prerequisites, idempotency, or what 'communicate' entails. This leaves significant behavioral ambiguity for a mutating/stateful operation.

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 concise sentence with no filler or redundant content. It is front-loaded with the verb and immediately states the resource and purpose, making it easy to parse.

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?

This is a very simple tool with one optional parameter and no output schema. The description covers the core purpose but omits context such as whether joining is required before using other Figma tools, whether the channel must exist, or what the result of joining is. For a minimal viable description it is adequate, but there are clear 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 fully documents the 'channel' parameter with a default value and description, achieving 100% coverage. The tool description adds no additional parameter meaning beyond restating 'a specific channel', so the baseline of 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 uses the specific verb 'join' with the resource 'a specific channel' and states the purpose 'to communicate with Figma'. This clearly distinguishes the tool from sibling design-operation tools, as no other sibling addresses channel communication.

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 implies the tool is used when one needs to communicate with Figma via a channel, but it does not explicitly state when to use it over alternatives or provide exclusions. Since no sibling tool has similar functionality, the context is somewhat clear, but the guidance remains implicit rather than explicit.

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