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

The annotations explicitly declare destructiveHint: true, and the description's 'Delete' is fully consistent with that, so there is no contradiction. However, beyond that alignment, the description discloses nothing additional — no mention of irreversibility, cascade effects on related journeys, or any confirmation behavior. Annotations already carry the safe-destructive profile, and the description adds no further behavioral color.

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, front-loaded sentence with zero filler — 'Delete a recorded visa.' Every word is purposeful and the statement is immediately scannable. The brevity is a genuine strength, and the structure could not reasonably be improved for this trivial delete operation.

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 minimally complex tool (one string parameter, no output schema, no enums), the description is close to sufficient — the destructiveness is covered by annotations and the purpose is clear. However, in the context of a travel-app domain (create_journey, list_visas, etc.), a note on whether deleting a visa cascades to journeys or whether it can be undone would materially improve completeness. The core use case is served, but edge-behavior questions remain unanswered.

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?

With 0% schema description coverage, the description carries the burden of explaining visa_id, but 'a recorded visa' is all it offers. It never explains that visa_id is an identifier, what format it follows, or where to obtain it (e.g., from list_visas). A single clarifying phrase like 'the ID returned by list_visas' would have turned this into a 4, but as-is the agent is left to infer the ID's provenance and type.

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 'Delete' as the verb and 'a recorded visa' as the resource, precisely matching the tool's name and unambiguously distinguishing it from the sibling delete_document, delete_flight, and delete_* tools targeting other entities. The word 'recorded' adds a small but meaningful scope qualifier, making the purpose crystal clear.

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?

There is zero guidance on when to use this tool versus alternatives. No exclusions are provided (e.g., 'use this instead of update_visa to remove a visa'), no prerequisites are mentioned, and there is no pointer to related tools like list_visas for finding the visa_id. The description offers no context for the decision of when to invoke this tool.

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