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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds behavioral context: combined keyword and semantic ranking, the 'best first call' role, default section behavior, and the fact that it returns 'basic information' only. It also discloses the sort behavior for queries without a topic. No contradiction with annotations.

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 front-loaded with purpose, then usage, then output/next-step guidance. Every sentence earns its place, though it could be tightened slightly by removing the final sentence about fetch, which is already implied by 'basic information.'

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?

An output schema exists, and the description covers the return type ('a list of search results with basic information') and points to fetch for full content. It also mentions the render step. For a search tool with a clear parameter set and safety annotations, this is complete enough. The only minor gap is no explicit mention of pagination, but the limit parameter covers that.

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 each parameter is already documented. The description adds little beyond the schema: it reinforces the 'combined keyword and semantic ranking' aspect (relevant to the source parameter) and the natural-language-query hint, but these are already in the schema descriptions. Baseline 3 is appropriate.

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 states a specific verb ('Search'), a clear resource ('all WindowsForum content'), and the scope (community threads, Windows news, tutorials). It explicitly positions itself as 'the best first call for any question or topic,' which differentiates it from the many sibling search tools without requiring the agent to compare schemas.

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?

Provides explicit guidance: keep section 'all' unless the user asks for one content type, and set sort='newest' for latest items. It also chains to render_search_results and fetch, telling the agent the next steps. It stops short of naming specific alternative tools or saying when NOT to use it, but the 'best first call' phrasing implies it is the default.

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