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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered; the description adds value by enumerating the returned attributes (title, type, start/end, priority, completion, owners, related records) and the backing endpoint, which is useful because there is no output schema. It omits error behavior (e.g., not-found handling), so it stops short of 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 compact sentences with the purpose front-loaded and no wasted words. The trailing 'JobNimbus: GET /tasks/{jnid}' is mildly redundant developer metadata but not harmful.

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 single-parameter read tool with annotations covering safety and no output schema, the description supplies the missing return-field overview, making it largely self-sufficient. A note on lookup failure behavior would make it fully complete.

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 the schema already documents jnid as the JobNimbus record id. The description only restates 'by jnid' without adding format, validation, or example detail, so it sits at the baseline 3 where the schema does the work.

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 task/appointment) scoped by jnid, which implicitly separates it from the sibling list_tasks. The added parenthetical of returnable fields sharpens what 'task' means here. It doesn't explicitly name the alternative tool, keeping it just below 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?

Usage is implied by 'single task ... by jnid', which signals this is the by-id lookup versus a listing tool, but no when/when-not condition or named alternative (jobnimbus_list_tasks, jobnimbus_get_job) is given. The agent must infer the choice from context.

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