event_bus_bus_subscribe

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 only states 'Subscribe to a topic' without describing side effects, persistence, duplicate handling, or whether it creates a lasting subscription. The behavioral impact is unclear.

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 consists of two concise sentences with no extraneous information. The first sentence states the core purpose, and the second provides a valuable usage tip. Every part is essential and well-organized.

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 simplicity of the tool (2 parameters, simple subscribe action), the description covers the essential concept. However, it omits details about the return value (despite an existing output schema), subscription lifecycle, or error conditions. It is adequate but not fully 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?

The input schema has 0% description coverage, so the description must add meaning. It explains topic as a string and clarifies that '*' subscribes to all events. For subscriber, it defines it as 'a name string identifying who receives the events,' which adds important context beyond the schema's bare titles.

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 clearly states 'Subscribe to a topic,' specifying the exact action and resource. It distinguishes from sibling tools like 'event_bus_bus_publish' (sends events) and 'event_bus_bus_unsubscribe' (removes subscription) by focusing on subscription. The special case for topic '*' adds specificity.

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 gives a usage tip for '*' to receive all events, which provides some guidance. However, it does not explicitly mention when not to use this tool versus alternatives (e.g., 'unsubscribe' to remove), leaving the decision to the agent's understanding of context.

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