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

Annotations already declare readOnlyHint=false, destructiveHint=true and idempotentHint=true. The description adds useful non-annotation context about auth ('connected Himalayas account; no extra sign-in needed'), which counts for something. It does not, however, warn that the existing answer text is overwritten and unrecoverable, which is the behavioral detail most relevant to a destructiveHint tool.

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 front-loaded clauses that state the action first and the operational context second, with no filler. Nearly optimal, though the account sentence could have been folded in a touch more tightly.

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 two-parameter mutation whose safety profile is fully covered by annotations and which has no output schema, the description supplies the essential extras: id provenance and auth requirement. The only meaningful gap is not flagging that the previous answer text is replaced.

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%, with both 'id' (source: list_saved_answers) and 'answer' (the full new answer) fully documented in the schema itself. The description restates the id provenance but adds no syntax or format detail beyond what the schema already provides, so baseline 3 applies.

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 (Change) and resource (the user's saved application answer) and scopes it to a single item by id. The reference to list_saved_answers as the id source distinguishes it cleanly from delete_saved_answer and list_saved_answers.

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 description implies the workflow by telling the agent where the id comes from (list_saved_answers) and that the connected account is used, which is genuine usage context. However it gives no when/when-not guidance or contrast with alternatives such as delete_saved_answer or update_document, so the guidance remains implied.

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