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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds value beyond that by naming the exact return shape {id,title,text,url,metadata}, which matters because there is no output schema. It stops short of noting error behavior for a missing or stale id.

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 compact clauses: the action and scope first, then the return shape. Every word carries information and nothing is buried or repeated.

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 single-param read tool with no output schema, the definition supplies the key missing piece — the response fields — and annotations carry the safety profile. The remaining gap is ambiguity against the get_product sibling and undefined failure behavior for an invalid id.

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?

With one parameter and 100% schema coverage, the schema already documents that id is the product handle returned by search. The description's '(the handle from search)' repeats that rather than adding format, validation, or fallback details, 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 and resource — fetch one Knobs.co product document by id — and names the return fields. However, it never distinguishes itself from the sibling get_product, which an agent could reasonably read as doing the same thing; only the '(the handle from search)' parenthetical hints at a distinct retrieval path.

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 parenthetical '(the handle from search)' implies the intended flow: get results from search, then fetch by id. There is no explicit when-to-use or when-not guidance, and no statement about which sibling to prefer (get_product vs fetch vs search_catalog), leaving the choice to inference.

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