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

Annotations provide destructive/idempotent hints, and the description adds substantial non-obvious behavior: calls are FREE, past-lease completions are refused with lease_lost and ignored, fence-less calls on re-hand-out items are refused with fence_required, the result is opaque and never parsed, and it is surfaced later by work_status. It also documents auth via header or agent_key fallback. This is exactly the kind of context agents need beyond annotations and schema.

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?

The description is long but information-dense, front-loading the core purpose and zero-cost fact. Nearly every sentence adds a distinct behavioral or auth detail, though 'FREE' appears twice and the HTTP route is slightly secondary. Overall it earns its length without being bloated.

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?

Given the param count, the fence/lease complexity, and the absence of an output schema, the description covers the key invocation concerns: what to provide, what errors to expect, auth, cost, and side effects on result visibility. The only real gap is that it does not say what a successful call returns, which would be useful since no output schema exists.

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%, so the baseline is 3, but the description adds value beyond the schema: it explains the purpose of the fence token, the consequence of an expired lease, and that the optional result is returned by work_status for parent progress. It also clarifies agent_key as a header fallback. The params themselves are already well described in the schema, so extra credit is modest but real.

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 opens with a specific action and resource: 'Complete an item you hold.' It clearly identifies successful completion rather than failure, and its references to work_fail are limited to shared fence/lease error behavior, so the agent can distinguish this from the failure-reporting sibling. The title also reinforces the purpose.

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 right time to call: when the agent holds the item and has finished it. It explains when the call will be refused (lease_lost, fence_required), but it never explicitly contrasts this tool with work_fail or the sibling 'complete', nor states 'use this for success, use work_fail for failure.' That leaves usage selection somewhat implied rather than explicit.

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