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

Annotations declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true; the description earns credit by explaining that open-world behavior concretely ('Competitor validation may read fresh Amazon Catalog product relationships') and by clarifying that the persisted plan is immutable and non-applying. It stops short of stating auth/scope prerequisites (e.g. required capability for competitor tracking), which would push it higher.

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?

Four compact sentences, front-loaded with the core action and the immutability guarantee, followed by scope and non-goals. Minor redundancy between 'Does not apply tracking changes' and the review framing, but no wasted bulk.

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?

With an output schema, full schema coverage, and annotations present, the description supplies exactly the missing behavioral context: immutability of the plan, non-application, competitor Catalog reads, and routing for excluded cases. Nothing an agent needs to select or invoke it correctly is absent.

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 100% and nested, so the schema already carries parameter meaning (trackingScope, productType, asin vs parentAsin, keyword limits). The description only adds a light gloss on owned-vs-competitor tracking, so baseline 3 is appropriate.

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?

Names a specific verb and resource ('Prepares and persists an immutable keyword-rank tracking change plan') and immediately delineates scope: owned products vs independent competitors. It distinguishes itself from apply_keyword_rank_tracking_creation ('Does not apply tracking changes') and from prepare_keyword_rank_tracking_changes ('paused tracking must use the status changes tool').

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?

Gives explicit exclusions and routing: existing active tracking is untouched, paused tracking belongs to the status-changes tool, and this tool does not apply changes. It implies the prepare→review→apply flow via 'explicit customer review' but never names the execution sibling (apply_keyword_rank_tracking_creation) or the confirm step, which the agent must infer.

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