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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. Beyond that the description adds nothing: it does not say that variants are staged as noindex/non-live drafts, whether edits are applied to real files, how take_over or idempotency behave, or that wait_seconds causes a polling delay.

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 with no filler, and the core action is front-loaded. The brevity, however, comes at the cost of under-specification rather than being genuinely economical, and the trailing operational hint is ambiguous.

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 8 parameters, nested objects, no output schema, and 0% parameter documentation, the description is far too thin. An agent would not know what target selection means, what the variants cap of 3 implies, or what the response looks like after a successful prepare.

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% across 8 parameters including nested target and variants objects, so the description carries the full burden and largely fails. "Exact edits" loosely gestures at the find/replace changes array, but target, page_path, take_over, wait_seconds, and replaces_variant_set are left entirely unexplained.

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 description says "Prepare noindex challengers with exact edits," which has a verb and an object but the object ("noindex challengers") is internal jargon that an agent cannot reliably map to A/B test variants. It also does nothing to separate this from the sibling tool abtests_create, leaving the prepare-vs-create distinction to guesswork.

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?

"Publish before launch" is the only usage signal and it is ambiguous — it is unclear whether the agent must have published something first, or whether this tool itself triggers a publish. There is no statement of when to call this instead of abtests_create, abtests_update, or abtests_set_status.

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