join_radio

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

With no annotations, the description carries the burden of explaining effects; it does state that registration makes the workspace visible to other participants, which is useful. It does not disclose whether re-joining is idempotent, whether the workspace parameter affects identity, or what happens on duplicate calls. This is acceptable but partial.

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 three short sentences with no filler, and the core action is front-loaded. The example values for agent_id are compact and immediately useful.

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 two-parameter join tool, it covers the main action and outcome, and no output schema exists that would document return values. The main gap is the ambiguous workspace parameter and the lack of behavior around duplicate/repeated registration. This makes it viable but not complete.

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 descriptions cover 0% of the parameters, so the description must compensate. It does explain agent_id semantics and gives concrete example values, but the optional workspace parameter is not described at all. This partial coverage justifies a middle score.

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 a specific verb ('Register') and a concrete resource ('this Cursor workspace' on the shared AgentRadio channel), so an agent immediately knows the tool's function. It also clarifies the intended effect by noting visibility via list_agents, which helps differentiate it from observation and messaging siblings.

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?

It implies when to use the tool — when a workspace needs to appear on the channel — and gives practical guidance on choosing a stable agent_id. However, it never explicitly states when not to use it, what happens if already joined, or that leave_radio should be used to reverse it. The usage context is clear but mostly implicit.

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