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

Beyond the annotations, the description adds valuable behavioral context: anyone with the link can read the trip without signing in, coordinates are withheld, and the address is stable across calls. It does not fully explain whether the first call creates the link or what happens when expires_in_days is set on an existing link, but the schema and idempotentHint cover part of that.

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 compact and front-loaded: the main action appears in the first sentence, followed by access semantics, stability, and lifecycle guidance. A little could be trimmed, but each sentence contributes useful information for invocation.

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 tool with no output schema, the description provides the key facts needed to call it correctly: what the returned link is, who can access it, that it is stable, and how to turn it off or change it. The main gap is not distinguishing this tool from revoke_share_link more explicitly.

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 description coverage is 100%, and both parameters (trip_id, expires_in_days) are already described in the input schema. The tool description adds no parameter-level meaning, so the baseline score of 3 applies.

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 a specific action and resource: 'Get this trip's public link', then describes the link's key properties (public read access, no sign-in, coordinates withheld, stable address). This clearly differentiates the tool from update_share_link and revoke_share_link, and the idempotent get-or-create behavior is strongly implied by 'calling again returns the same one'.

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 clear intended use case and explicitly routes lifecycle changes ('Turning it off or changing it') to update_share_link. However, it does not mention revoke_share_link, a sibling that likely also relates to disabling/invalidating the link, so the when-not guidance is slightly incomplete.

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