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

readOnlyHint=true already declares this is a safe read. The description contributes only the word 最新, hinting at recency, but says nothing about result ordering (relevance vs date), whether it searches titles, URLs or comment bodies, or pagination. With annotations covering the safety profile only, the description leaves most behavior undisclosed.

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 short sentence with the resource front-loaded and the backing API noted in parentheses. Nothing is wasted, though there is also very little substance.

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 simple read-only search with fully described parameters and a readOnlyHint, the minimum is met. However with no output schema, an agent still cannot tell what a hit looks like (title? points? comment text? URL?), which would matter for chaining results into web_fetch.

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 all three parameters (query, tags, hitsPerPage) are already documented including examples and defaults. The description adds nothing parameter-specific, so the baseline 3 applies.

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?

Names a specific verb (搜索) and resource (Hacker News 最新科技资讯与讨论), and identifies the underlying source (Algolia HN Search). This is unambiguous on its own; sibling differentiation is moot since none of the other tools touch news/content search.

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?

No guidance on when to use this versus web_fetch, which is the only vaguely related sibling. No mention of what kinds of queries work well (stories vs comments), no prerequisites, no exclusions.

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