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

Annotations declare readOnlyHint=true, so the safety profile is already covered. The description still adds value by disclosing the payload contents (cron expression, timezone, active state), which matters because there is no output schema, and it maps the call to the underlying GET endpoint. It does not cover error behavior for a missing id, so not a 5.

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 sentences, front-loaded with the action and returned data before the endpoint reference. Nothing is padded, though the endpoint sentence is largely restatement for agents that don't map to REST paths.

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 readOnlyHint coverage and no output schema, the description supplies the essential missing piece — what the response contains — plus the API mapping. Only error/not-found behavior is absent, which is a minor gap.

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 single parameter is fully documented in the schema with its 'sched_...' format. The description only repeats the id via the endpoint path template, adding no new syntax or constraint information, so the baseline 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?

States a specific verb (Fetch) and resource (a single schedule) and enumerates the returned fields (cron expression, timezone, active state), so an agent knows exactly what it gets back. The word 'single' implicitly separates it from trigger_list_schedules, but no sibling is named explicitly, keeping it 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?

The description implies the use case by contrasting 'a single schedule' against the sibling list tool, but never states when to prefer this over trigger_list_schedules or that it requires a known schedule_id. Usage is inferable rather than spelled out.

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