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

No annotations are supplied, so the description carries the full burden; it does disclose that results are 'source-backed' and that a 'pageCount' is returned, which is useful. It says nothing about matching behavior (title vs body), cost, rate limits, or whether results are stably ordered, leaving real gaps for a search tool.

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 tight sentences, front-loaded with the action and the filterable facets, and the return shape is stated up front. Nothing is padded, though the phrasing 'Search and page through' is slightly redundant.

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 seven-parameter search tool with no output schema and thin schema descriptions, the entry is adequate but incomplete: it never explains sort semantics, the default page size, or how keyword matching works. The stated return fields (results, pageCount) do cover the missing output schema reasonably.

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 only 29%, so the description should compensate. It names four of the seven parameters (keyword/query, category, tag, sort order), but says nothing about page, limit, or cursor semantics, and 'page through' only loosely implies paging.

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?

Specific verb (search/page through) plus a clearly named resource (the niubiagent archive) and the facets it supports (keyword, category, tag, sort order). It implicitly separates itself from get_latest_signals by scoping to the 'full archive', but never names or contrasts the sibling tools.

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?

There is no explicit when-to-use guidance or routing against the siblings get_latest_signals, get_signal, or get_daily_briefing. An agent must infer that this is the general search entry point rather than the recent-items or single-item tools.

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