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

The annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description contributes the authorization precondition ('Requires account research access'), which the annotations cannot express. It does not explain pagination behavior or what happens with an invalid/expired identifier — meaningful gaps for a paged read.

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 short sentences, zero filler, and the key dependency (identifier from options_question) is front-loaded alongside the action. Nothing to remove.

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 four-parameter read with no output schema, the definition covers what it is, where the identifier comes from, and the access requirement. The remaining gap is the semantics of limit/offset relative to path traversal, which an agent would need to guess.

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 only 25%: only 'path' is documented in the schema, and the description clarifies the required 'snapshot' parameter as an identifier produced by options_question, which is genuinely useful meaning beyond the bare string type. However, 'limit' and 'offset' are undocumented in both places, and their interaction with 'path' paging is left ambiguous.

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 verb and resource ('Read a retained options-history snapshot') and ties the input to a sibling's output ('using the identifier returned by options_question'), which separates it from the sibling that produces that identifier. It stops short of describing what the snapshot contains, so it is clear but not maximally distinguishing.

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?

Gives a clear precondition for use — you must already have an identifier from options_question — and names the access requirement. It does not state when not to use it or what to do if the snapshot is stale or expired, so there is no explicit exclusion guidance.

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