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

Annotations already cover the read/write, openness, idempotency, and destructive profile. The description adds useful behavioral detail beyond those annotations: it is free, requires no gas, relays through the same public gate as any HTTP client, and is signed by the user's own wallet or passkey without the house holding a key.

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 front-loaded and appropriately short, first explaining the completion action and then the signing/cost context. There is minor redundancy between 'Free, always' and 'Cost and signer: free, no gas', but it does not obscure the instruction.

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?

Given the 100% schema coverage and the presence of an output schema, the description supplies what the agent needs for correct invocation: the step-2 relationship to prepare_backing_withdraw, the unchanged body requirement, and the signing and cost model. No essential calling context appears to be missing.

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 the schema already documents all three parameters. The description reinforces the key constraint that bodyJson must be the exact BODY_JSON from prepare_backing_withdraw, but this largely repeats what the schema descriptions already state rather than adding new semantics.

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 verb and resource: completing the backing withdrawal as step 2. It explicitly references prepare_backing_withdraw, so an agent can distinguish this submit step from the prepare step and from other submit_* siblings.

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 makes the usage context clear by naming prepare_backing_withdraw and saying to pass its BODY_JSON unchanged with the signature. It implicitly tells the agent this is the post-preparation step, but it does not state exclusions or when not to use it.

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