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

With no annotations, the description carries the full burden. It discloses the default window (14 days) and hints at a paid tier with 'PRO', but says nothing about return shape, ordering (presumably by deadline), result caps, pagination, or what authentication is required beyond what the access_token schema line states.

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?

One compact sentence that front-loads the resource and the key default. No waste, though the leading 'PRO.' token is unexplained and slightly opaque to 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-parameter tool with no annotations and no output schema, the definition is too thin: no statement of what a result looks like, whether results are ordered by closing date, or how authentication failure behaves. An agent can call it, but not confidently predict or interpret the response.

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 coverage is only 33%, so the description must compensate. It does add the crucial default of 14 for 'days' and marks 'keyword' as optional, which the bare schema does not. It still gives no guidance on keyword matching semantics or the unit/format expectations of 'days'.

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 and scope: open tenders closing within N days, with an optional keyword filter. The 'closing soon' window implicitly differentiates it from siblings like new_since (recently published) and tender_search, though it never names them explicitly.

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?

Usage is implied by the scope ('closing within N days'), so an agent can infer this is the deadline-driven query. However, no explicit when-to-use conditions, no mention of when to prefer tender_search or new_since instead, and no prerequisites beyond the cryptic 'PRO' prefix.

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