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

No annotations are supplied, so the description carries the burden. It does add real behavioral context that structured fields do not: the tool is paid ($0.01 USDC per call via x402 on eip155:8453) and spans all buyers rather than a single workspace. It omits pagination behavior, what a notice object contains, and any rate or consistency caveats.

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?

Two sentences, no filler, with the cost/payment prefix and the core scope front-loaded ahead of the framing sentence. The payment tag is slightly noisy but is genuinely decision-relevant for an agent.

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 three-optional-parameter listing tool with no output schema and no annotations, the description covers cost, scope, ordering, and the one filter that matters. Return shape and default window are inferable from schema, leaving little an agent needs but cannot find.

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 schema already documents days, dept, and limit. The description only adds meaning for dept ('optionally filtered by department') and implies result ordering; it says nothing about the days window semantics or the 1-50 limit range beyond the schema.

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?

States a specific resource plus an ordering rule: 'notices closing soonest, across all buyers, optionally filtered by department.' An agent can tell it retrieves deadline-sorted tender notices rather than a general search. It never names the sibling tender_search, so the distinction from that tool is left implicit.

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 shortest path for an agent that must act before a deadline' implies the usage condition (urgency-driven workflows), but no explicit when-not, no named alternative, and no guidance on whether tender_search should be preferred for non-urgent or keyword-driven lookups.

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