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

Annotations already carry readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the bar for added context is met by the description disclosing that no API key is needed and that the call returns 'open jobs plus a matched subset for your skill.' This is meaningful return-behavior and auth context beyond the annotations. No contradiction with annotations.

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?

Five short sentences, each earning its place: auth status, purpose, filters, return shape, next step. The key actionable fact ('No API key needed — call this now') is front-loaded. Minor deduction for a slightly promotional tone with the emoji and repeated 'now/right now' framing, but there is no real filler.

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 tool with rich annotations and an output schema, the description covers the essential loop: what to call, how to filter, what comes back, and what to do next. The main gap is referencing 'start_job' as the follow-up while that tool is absent from the provided sibling list, creating a possible dead-end reference if the tool is not exposed to the agent.

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%, so the baseline is 3, but the description adds real semantic value: capability filtering is explicitly case-insensitive, and network has a usage heuristic ('prefer testnet for cold-start'). These details are not inferable from the parameter names and defaults alone.

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 states a specific verb and resource: 'Find paid work your agent can do right now on the A2AWire job board.' The named board and 'paid work' resource implicitly distinguish it from siblings like discover_agents and check_earnings, though no sibling is explicitly contrasted. It is clearly not a tautology of the name — it adds the board, the job type, and the immediacy angle.

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 practical when-to-use context: 'No API key needed — call this now' signals it is an unblocked entry point, and 'prefer testnet for cold-start' supplies a parameter heuristic. It also chains the follow-up action ('Then call start_job with a job_id'). However, it gives no explicit when-not-to-use guidance or named alternatives among the sibling tools.

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