mixpanel_track_event

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

No annotations are provided, so the description carries the full burden of disclosing behavior. It only says 'track', which implies a write operation, but does not disclose authentication requirements, rate limits, idempotency, or success/failure handling. This is a critical gap for a tool that sends data.

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 very concise (6 words), but lacks structure or additional detail. While it is front-loaded, it does not use the available space to provide any further context. It is neither verbose nor well-structured.

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 that this is a write operation with 7 parameters and no output schema or annotations, the description is severely incomplete. It does not mention that it sends data, what the response looks like, or any side effects. The agent has insufficient context to use this tool safely.

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 100% parameter description coverage, so the schema already explains each parameter. The description adds no extra semantic context beyond restating the tool's purpose. Baseline 3 is appropriate as the description provides no additional meaning.

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 the tool's action ('Track a custom event') and resource ('in Mixpanel'). The verb+resource combination is specific, and the tool name itself reinforces the purpose. It distinguishes itself from sibling tools like mixpanel_get_events and mixpanel_export_data by focusing on tracking (sending) events rather than reading data.

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 provides no guidance on when to use this tool versus its siblings. There is no mention of prerequisites, alternatives, or scenarios where tracking is appropriate or not. An agent would have to infer from the name and parameters alone.

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