presence_add_channels

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

The description provides no behavioral details such as side effects, whether it modifies the directory, how it uses the api_key, or what it returns. The only extra note, 'Pro feature', is a licensing constraint, not a behavior. With no annotations provided, the description carries the full burden and fails to disclose anything about the tool's actual behavior.

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 brief phrase, which is concise and front-loaded. However, it is too terse to be helpful, lacking any structure that guides the agent. It is efficient in length but insufficient in content, so it earns a mid-range score.

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 the tool has two parameters, no output schema, and no annotations, the description is extremely incomplete. It does not explain what 'channel-based presence' means, what 'directory' is used for, or what 'api_key' is for. There is no mention of prerequisites, expected outcome, or any related context. An agent has almost no information to correctly invoke this tool.

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 description does not mention any parameters. The schema covers 50% of parameters (only 'directory' has a description). The description adds no meaning beyond the schema, so it does not compensate for the missing 'api_key' description. An agent cannot infer the purpose of 'api_key' from the description.

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 'Generate channel-based presence' which names a specific action and resource, but it does not clearly differentiate from sibling presence tools like presence_generate_server or presence_generate_client. The phrase 'channel-based' adds some specificity, yet overall it remains a brief, somewhat ambiguous declaration.

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?

No guidance is given on when to use this tool versus alternatives. There is no mention of prerequisites, context, or any distinguishing conditions that would help an agent decide between this and presence_generate_server/client or other tools. The description simply states the action without any usage context.

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