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

No annotations are provided, so the description carries the full burden. It does disclose a real behavioral constraint — only *public* tools are returned, plus the two fields in the response (descriptor, args_schema) — but it says nothing about auth requirements, behavior when the name is unknown or non-public, or error/empty results.

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?

A single front-loaded sentence with zero filler; the verb, resource, and lookup key are all in the first clause.

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 two-parameter read tool with a fully documented schema, the description covers the essentials and even compensates for the absent output schema by naming the returned fields. Only failure/not-found behavior and the public-only scope's implications are left unstated.

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 the description's restatement of the full_name format (<namespace>.<name>) merely duplicates the schema. The auth nuance for tenant_key lives in the schema, not the description, so no added meaning is contributed. 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 — 'Return one public tool's descriptor and args_schema by its full name' — so an agent knows exactly what it retrieves and in what key. It contrasts implicitly with the sibling host.catalog.search by emphasizing 'one ... by its full name', but it never names that sibling, so the differentiation is left to inference.

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 only implied: 'by its full name' signals this is the lookup you use when you already know the exact <namespace>.<name>, versus browsing via host.catalog.search. There is no explicit when-to-use, when-not-to-use, or named alternative, so the agent must infer the routing.

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