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

Annotations already mark the tool as read-only and non-destructive, covering the safety profile. The description adds meaningful behavioral context by specifying the search scope (individual post content, not titles) and the intended purpose. It does not disclose pagination or matching semantics, but the output schema covers return structure, so the additional context is sufficient.

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 sentence of about 29 words, front-loaded with the action ('Search individual WindowsForum posts') followed by a pragmatic use case. No filler, no repetition, and every clause earns its place.

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?

With a complete input schema, an output schema, and read-only annotations, the description only needs to convey purpose and selection context, which it does. It distinguishes from thread-title search but not from the other search siblings (search_elastic, search_mysql, search_semantic), leaving some ambiguity among the wider tool set.

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%, with the section parameter's enum values and usage guidance already fully explained in the schema. The description's phrase 'keyword or phrase' loosely maps to the query parameter but adds no new parameter-level information. Baseline 3 applies because the schema does the heavy lifting.

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 specific resource ('individual WindowsForum posts'), and explicitly contrasts with 'not just thread titles', distinguishing it from sibling search_threads. It also names the use case (answers, error messages, fixes buried in long threads), making the tool's purpose unambiguous.

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?

It gives an explicit when-to-use cue: 'use to find specific answers, error messages, or fixes buried inside long threads.' The phrase 'not just thread titles' implies a contrast with thread-title search, but it never names an alternative tool or states when not to use it, so it falls short of a full 5.

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