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

No annotations are provided, so the description must carry all behavioral disclosure. It only says 'Build the combined ... tx', which implies transaction construction but omits details such as whether it requires specific permissions, what happens if the proof is invalid, or whether it mutates state (though as a build step, likely not directly).

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 sentence with no wasted words. It front-loades the core purpose and the critical input constraint, making it highly efficient.

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 build tool with no output schema and no annotations, the description is too brief. It does not explain what the tool returns (e.g., a serialized transaction, a transaction hash), how to use the output, or how this build step relates to execution tools like solknife_ct_submit. This leaves gaps for an agent to correctly invoke the tool.

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%, so parameters are already documented. The description adds the specific '96 B base64' constraint for zeroCiphertextProof, which provides useful context beyond the schema's general '96-byte' note. This is a minor improvement, justifying a baseline of 3.

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 clearly states it builds a combined EmptyAccount + CloseAccount transaction, and specifies the key input (96 B base64 zero-ciphertext proof). However, it does not differentiate from sibling build tools like solknife_ct_deposit_build, though the name is already distinctive.

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 when constructing an empty-and-close operation, but lacks explicit guidance on when to use this tool versus alternatives (e.g., separate empty/close steps) or any prerequisites (e.g., need for a pre-existing account).

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