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

Annotations already declare idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds one real behavioral fact beyond that — the checklist/walkthrough is created if it doesn't exist — but says nothing about overwrite semantics for previously saved answers, permission requirements, or what the caller gets back.

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 action and side effect, then a compact per-field gloss. Dense but every clause about answer formats earns its place given the polymorphic answer type; only the «Describe the reality» phrasing is slightly site-specific noise.

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 mutation tool with no output schema, the description covers the hardest part (polymorphic answer values) but omits what happens to answers not included in the payload, whether repeated calls merge or replace, and what a successful response contains. Adequate to call correctly, incomplete for predicting effects.

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 33% and the `answer` property is an untyped empty schema, so the description carries real weight here: it enumerates the expected value shape per question type (yes/no string, 1-based option numbers or list, rating number, free text). `comment` is also explained with a concrete example. `by_ai` and `checklist_id` are left to the schema, which does document `by_ai` adequately.

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+resource ("Save answers to a checklist") and immediately discloses the side effect of starting the walkthrough. It does not distinguish itself from the sibling finish_checklist, so an agent must infer the boundary between saving answers and completing a checklist.

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 "starts the walkthrough if needed," which tells the agent this can be the first call in a flow. However, there is no explicit when-to-use/when-not guidance relative to siblings like checklist_questions or finish_checklist, and no statement about whether this can be called repeatedly as answers accumulate.

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