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

Annotations declare destructiveHint=true and idempotentHint=true, and the description adds real context beyond that: authentication requirement, no coin cost, the reset_to_default escape hatch, and the full defaults list so the agent knows what "default" means. It stops short of stating whether partial updates overwrite or preserve untouched fields, which is the key remaining behavioral question for a destructive, all-optional update.

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 the core action plus auth/reset notes, then a scannable Settings block with one line per parameter and a compact Defaults line. It is on the long side, but nearly every line is actionable reference material rather than filler.

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 seven-parameter, all-optional mutation tool with no output schema, the description covers auth, cost, per-field formats, defaults, and the reset path -- enough to call it correctly. The missing piece is the merge-vs-replace semantics for omitted fields, which matters given destructiveHint=true.

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 0%, so the description must carry all seven parameters, and it does: language, card_styles, image_theme, image_source, reset_to_default, and the cards_per_unit_min/max range are each explained with formats and examples. The gap is null semantics -- nothing says whether passing null leaves a setting unchanged or clears it.

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 ("Update your flashcard generation preferences") that clearly differs from the read-only sibling my_flashcard_settings and the content-editing sibling edit_flashcards. It never names those siblings explicitly, so an agent must infer the distinction, but the purpose itself is 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?

Usage is implied by the wording and reinforced with concrete instructions ("Set reset_to_default=true to restore all defaults"), and the authentication/free-cost notes help an agent decide it is safe to call. However, there is no explicit when-to-use/when-not guidance relative to my_flashcard_settings or edit_flashcards, nor any warning about whether omitted fields are preserved.

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