Identify Visitor

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

With no annotations, the description carries the full burden of behavioral disclosure. It only mentions the action 'Link/Associates' without addressing idempotency, overwrite behavior, permissions, or response. The phrase 'optional metadata' contradicts the schema (which has no such parameter), adding confusion rather than transparency.

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 concise at two sentences and front-loaded with the core purpose. However, the reference to 'optional metadata' is redundant or inaccurate relative to the schema, slightly reducing efficiency.

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's simplicity (2 params, full schema coverage, no output schema), the description provides adequate purpose and parameter info. However, it lacks behavioral details such as response format or side effects, and the metadata discrepancy undermines completeness for an agent needing to invoke it correctly.

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 coverage is 100%, so the baseline is 3. The description does not add meaning beyond the schema; it mentions 'optional metadata' not present in the schema, which could mislead. However, it does reinforce the association intent for the two required parameters.

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 function with a specific verb 'Link' and resource 'DataFast visitor to a user'. It distinguishes itself from siblings like get_visitor and track_goal by indicating an association operation rather than retrieval or event tracking.

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 usage by explaining the action, but it does not explicitly state when to use this tool vs alternatives, nor does it mention exclusions or prerequisites. For a linking operation, context is reasonably clear but guidance on alternative tools (e.g., get_visitor) is absent.

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