Claim bounded project work

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

The description goes beyond the annotations (readOnlyHint: false, idempotentHint: true, destructiveHint: false) by revealing atomicity, a five-minute renewable lease, and an immutable budget snapshot. These are important behavioral traits that help the agent understand side effects and what to expect.

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 a single sentence that is front-loaded with 'Atomically claim' and contains no waste or redundant info. Every phrase adds value, making it highly concise and well-structured.

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?

With no output schema, the description should explain return values; it does hint at the lease and budget snapshot, but not their structure. It also omits parameter details and error scenarios, leaving gaps that make it minimally viable but not fully complete for an agent invoking the tool correctly.

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 0%, so the description must compensate for missing parameter explanations. It does not mention idempotency_key or input_refs at all, and assignment_id is only vaguely implied by 'claim one open assignment.' The description fails to provide the necessary parameter semantics.

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 'Atomically claim one open assignment and receive a five-minute renewable lease plus an immutable budget snapshot' clearly states the verb (claim), resource (open assignment), and outcome (lease and snapshot). It distinguishes from siblings like create_work_assignment (creation) and heartbeat_work_session (renewal) by focusing on the specific claim action.

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 usage when an assignment needs claiming, but it does not explicitly state when to use this tool versus alternatives, nor does it mention exclusions or related lifecycle steps. The context is adequate but lacks direct guidance such as 'use when you want to start work' or 'instead of heartbeat.'

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