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

The annotations already declare readOnlyHint, idempotent, and non-destructive, so the bar is lower. The description adds the useful trait 'No API key needed' and implies read-only behavior by saying 'Returns open jobs'. It does not mention any side effects, which is consistent with the annotations. It adds a bit of context beyond the annotations, earning a 4.

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 concise and information-dense, with only two sentences plus a follow-up. It front-loads the primary action and includes filtering guidance and next steps. The '✅' and 'call this now' are slightly promotional but do not bloat the text. It is well-structured and efficient, though could be slightly cleaner without the emoji.

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?

The description covers the input (capability, network), the output (open jobs plus matched subset), and the next step (start_job). It also mentions the cold-start preference and that no API key is needed. Given the presence of an output schema, it does not need to detail the return format. It is complete for a simple read-only tool, though it does not mention any rate limits or edge cases, which are not critical here.

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 descriptions already cover all parameters well, but the description enriches them by noting 'capability (case-insensitive)'—a detail not present in the schema—and reinforces the testnet preference. It also clarifies the purpose of the network parameter for cold-start scenarios. This adds value beyond the schema, making it a 5.

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: 'Find paid work your agent can do right now on the A2AWire job board.' It uses a specific verb ('Find') and resource ('paid work on A2AWire job board'), and distinguishes itself by mentioning the follow-up 'start_job' call, even though that tool is not in the sibling list. It is unambiguous and easy to understand.

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 provides actionable usage guidance: 'call this now' implies it is the primary tool for this purpose, 'Filter by capability (case-insensitive) and network (prefer testnet for cold-start)' tells how to refine the search, and 'Then call start_job with a job_id' suggests the next step. However, it does not explicitly contrast with sibling tools like 'discover_agents' or 'a2awire_guide', so it loses one point for lack of explicit when-not-to-use guidance.

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