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

Far beyond the annotations: it discloses the USD 0.01 charge after explicit authorization, that unsupported results are free, that up to five excerpts are sent to an AI service, that no web search or external actions occur, that removed/replaced sources yield 'stale' rather than leaking the old answer, and the exact citation fields returned. Annotations only say read-only/idempotent; the description supplies the cost, privacy, and staleness semantics that actually govern correct invocation.

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?

Purpose and account scope are front-loaded, and nearly every sentence carries distinct information (cost, free-unsupported, citation fields, staleness, reuse). It is dense and slightly clipped in places ('No web search, tools or external actions.'), and the get_base cross-reference could be folded into the opening rather than trailing at the end.

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?

There is no output schema, so the description must carry return semantics — and it does: citation shape (document ID, version, content hash, exact excerpt), the 'stale' and 'unsupported' outcomes, and the reuse behavior. Combined with the billing and authorization notes, an agent has everything needed to call this correctly.

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 100%, so both parameters are already documented as 64-character IDs. The description adds only indirect meaning ('one base owned by the current personal account', 'the same question'), with no format, sourcing, or lookup guidance for question_id beyond the schema baseline.

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 opening pair of sentences states a specific verb and resource ('Read an answer and its source versions', 'Ask about one base owned by the current personal account'), which is exactly what an agent needs to distinguish this from the many get_base_* and read_base_* siblings. The scope qualifier 'personal account' implicitly separates it from team_get_base_answer.

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 concrete selection context ('owned by the current personal account') and points at the related retrieval path by noting 'get_base also returns the latest answer' and that a repeat question with the same source versions reuses the saved purchase. What's missing is an explicit contrast with ask_base_question (create a new answer) versus retrieving an existing one, which is the most likely sibling confusion.

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