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

Annotations already declare readOnly, idempotent, non-destructive, so safety needs no restating. The description adds genuine context: facts carry sources and dates and are 'kept current', which tells the agent how to trust and cite the output. No mention of staleness windows or limits, keeping it below a 5.

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?

Front-loaded with purpose and followed by a long parenthetical topic inventory that is informative but bulky. The critical action semantics are pushed into a trailing sentence, and the sentence is dense enough to be hard to scan.

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?

No output schema exists, and the description compensates by describing what results look like (facts with source and date, change deltas). With a 6-parameter, 0-required tool, the only uncovered element is the `history` flag's effect.

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 83%, so baseline is 3, and the description earns above that by mapping parameters to actions ('search (q, optional topic), fact (id), changes (what changed since a day, optional q and topic)'). The `history` parameter is never explained, which is the remaining gap.

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 (Roblox platform knowledge from official docs, DevForum, roadmap, Help Center) with the topical scope enumerated and the three actions named. An agent knows this is a curated, sourced knowledge base rather than live game data. It does not distinguish itself from sibling tools like `roblox` or `search`, which is the only real gap.

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?

The action list (search / fact / changes) implies when each mode applies, and 'what changed since a day' is a clear use case. But it never says when to prefer this over the sibling `roblox` or `search` tools, nor any exclusions. Usage is inferable rather than stated.

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