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

Annotations already declare idempotentHint=true, destructiveHint=false and readOnlyHint=false, so the safety profile is covered. The description adds genuinely new context beyond that: the claim is atomic, leases can expire, and a write scope is required. Lease renewal/expiry behavior after the claim succeeds is still unexplained.

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 tight sentences with the core action and its precondition front-loaded, and the authorization requirement last. No wasted words.

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 mutating, idempotent tool with annotations and no output schema, the definition covers purpose and scope but omits what a successful claim returns (lease expiry time?) and what error occurs when the task is already claimed — important for a lease-based tool.

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 only 25% — only idempotency_key is documented in the schema. The description never mentions lease_seconds (default 900, max 86400) or clarifies the semantics of task_id/workspace_id, so it fails to compensate for the coverage gap on a parameter that materially affects behavior.

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 and resource ('atomically claim an open task') plus the lease-expiry edge case, which clearly distinguishes it from siblings like create_task and complete_task. It stops short of naming any sibling explicitly, so it lands at 4 rather than 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?

Gives a clear precondition for use — the task must be open or have an expired lease — and states the required scope 'tasks:write'. It does not mention what to do if the claim fails or point to alternatives such as list_tasks, so no explicit exclusion guidance.

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