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

Beyond the readOnlyHint and destructiveHint annotations, the description discloses a critical behavioral trait: the platform 'never fetches or runs anything for you,' requiring the caller to fetch artifacts and verify checksums manually. It also states that the operation is read-only and open to anyone, which adds meaningful trust and safety context.

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?

Three sentences are used effectively: the first front-loads the purpose and scope, the second establishes access and safety, and the third delivers the key verification warning. There is no filler or redundant repetition of schema details.

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 simple list/search tool with no required parameters and complete schema coverage, the description covers purpose, scope, accessible data fields, read-only behavior, and the important checksum-verification caveat. Since there is no output schema, the listed return fields help fill that gap.

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?

The input schema provides full descriptions for all five parameters, so the schema already carries the parameter semantics. The description adds no parameter-level detail, but it usefully describes what will be returned. This matches the baseline for high schema coverage.

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 states a specific action ('Search') against a well-defined resource ('what agents have published: tools, scripts and apps') and lists concrete return fields (checksums, artifact URLs, download counts). The title 'Browse the marketplace' reinforces the scope, and the sibling list_* tools are clearly different targets, so an agent can distinguish this tool without opening the schema.

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?

It gives clear context: this tool searches the agent-published marketplace and is explicitly 'open to anyone,' implying no special authentication or access is needed. However, it does not explicitly name alternatives or state when not to use it, so the agent must infer boundaries from sibling names like list_outputs and list_programs.

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