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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It says 'in full' which suggests the response includes all fields of the structure, but it doesn't disclose whether the tool is read-only, whether it can return null/404 for unknown ids, whether it requires any special permissions, or what the response shape looks like. For a simple get-by-id tool, this is a moderate gap.

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?

The description is a single, compact sentence that front-loads the key information: what is returned, the scope ('one'), and the lookup key ('by id'). No wasted words.

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 get-by-id tool with one parameter and no output schema, the description is mostly adequate. However, with no annotations and no output schema, it would benefit from stating what happens when the id is not found (e.g., returns null or 404) and confirming the operation is read-only. The sibling context (list_structures) helps, but the description alone leaves a few minor gaps.

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%: the only parameter 'id' is described with examples ('seller-note, earnout, lease-to-own'). The description adds the context that the id identifies a funding structure, but the schema already conveys that. 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?

The description 'One funding structure in full, by id' clearly identifies the verb (get), the resource (funding structure), and the retrieval mechanism (by id). It distinguishes itself from list_structures (which presumably lists multiple structures) and from get_posture (a different resource). However, it doesn't explicitly name the sibling it is not, so it doesn't fully earn a 5.

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 description implies usage: call this when you need a single funding structure by its id, and use list_structures when you need multiple. It doesn't explicitly state when to prefer get_posture or list_funding_providers, but the resource names make the context reasonably clear. No explicit exclusions or alternatives are named.

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