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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds only the backing endpoint (GET /rental/{rental_pkey}); it says nothing about not-found behavior, error shape, or what the returned rental contains, which is the remaining useful context.

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 short fragments, front-loaded with the resource and scope, then the id provenance and endpoint. Nothing padding, nothing buried.

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 one-parameter read tool with full schema coverage and complete annotations, the definition covers what an agent needs to invoke it. The only gap is the absence of an output schema combined with no hint about the returned rental shape, but that is minor here.

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% and the schema already defines rental_id as the pkey Tokeet returns, so the baseline is 3. The description earns one extra point by naming the tool that issues that id, turning a bare parameter into a usable call chain.

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?

States a specific verb+resource+scope: fetch one rental property by id. It also names the sibling that produces the id (tokeet_list_rentals), so an agent can immediately place it against tokeet_list_rentals and the other tokeet_get_* tools.

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?

It makes the usage chain explicit by telling the agent the id is 'its pkey from tokeet_list_rentals', which answers where the required argument comes from. It stops short of stating when not to use it (e.g. batch lookups across rentals), so no exclusion guidance.

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