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

Annotations already flag destructiveHint=true and idempotentHint=false, and the description adds real value on top: it explains that re-sharing mints a new random token and silently invalidates the old link (accounting for non-idempotency) and that unsharing removes the link. It also discloses the privacy posture (name shown, owner never shown) and that prices are live rather than frozen. It stops short of stating authorization requirements or what happens to an already-shared comparison on repeated calls.

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?

Two compact clauses, each mapping a parameter value to its effect, front-loaded with the mutation and followed by the disclosure about link contents. No filler.

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 3-parameter destructive toggle with no output schema, the description covers the state transition, token rotation, and what the link exposes — enough to call it correctly. Ownership/authorization and the response shape are the remaining unknowns, but neither blocks a correct invocation.

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 67%, and the one undocumented parameter, `shared`, is exactly what the description explains in full — both boolean branches and their side effects. `locale` and `comparison_id` are already documented in the schema, so no meaningful gap remains, though nothing is said about locale affecting the shared page's language.

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 precisely what each value of `shared` does to the saved comparison's link, so the verb+resource is inferable (share/unshare a comparison). It does not name the sibling it differs from (e.g. delete_comparison, which removes the comparison itself rather than just the link), so it falls short of a 5.

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 no explicit guidance on when to call this versus alternatives such as delete_comparison or list_my_comparisons, and no mention of prerequisites like owning the comparison. Usage is only implied by the explanation of the two `shared` states.

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