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

The description adds valuable behavioral context beyond annotations: it clarifies that this is a pull/claim operation requiring authentication, and that results are strictly scoped to the caller's credential. It explains why readOnlyHint=false (claiming has side effects) and idempotentHint=false (claim may not be repeatable), without contradicting any annotations. The lack of detail about what happens after claiming is a minor gap.

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 three sentences, each serving a distinct purpose: core action, unique advantage, and a security constraint. It is front-loaded and free of filler, making it highly efficient and easy to scan.

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 simple one-parameter tool with a known output schema, the description conveys the essential purpose, the specific use case (no public endpoint), the authentication requirement, and the credential scoping. It provides enough context for an agent to correctly invoke it without further clarification.

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?

The schema already provides comprehensive documentation for the single 'limit' parameter (range, default, purpose). The description does not mention or enhance this parameter, so it adds no value beyond the schema. With 100% schema coverage, the baseline of 3 is appropriate.

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 clearly states the tool's function: 'Collect A2A work addressed to you.' It distinguishes from sibling tools by explaining the unique pull model for agents without a public endpoint, and specifically notes that only tasks addressed to the caller's credential are returned, making it unambiguous.

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?

Explicitly specifies when to use this tool: 'This is how an agent with no public endpoint participates.' It also describes the usage pattern (authenticate and pull) and warns that the responder is derived from the key and cannot be supplied, effectively saying this tool is for receiving your own tasks only. This provides clear guidance on when not to use alternative endpoints.

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