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

Annotations already declare the mutation/safety profile (readOnly=false, idempotent, non-destructive, open-world). The description adds genuine value beyond that: it clarifies that no signing or broadcasting occurs and that the caller must be the authenticated solver. It still omits what "prepare" actually produces (a payload? a stored draft?) and what side effects the recheck has, which matters for an open-world mutating tool.

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 short sentences, no padding, with the effect statement front-loaded before the signing caveat. Efficient, though it spends words on the vague "recheck stored bytes" phrase that could have been used to describe behavior.

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?

No output schema, five undocumented required parameters including a nested object, and an open-world mutating operation. The description covers intent and the signing boundary but leaves the agent unable to construct a correct `evidence` payload or anticipate the result — a substantial gap for this complexity.

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?

All five parameters are required with zero schema description coverage, including a nested `evidence` object whose shape is entirely undocumented. The description supplies no parameter meaning at all; only faint inferences are available ("authenticated solver" gestures at `solver_wallet`, "existing-contract" at `bounty_contract`). This is far below what a 0%-coverage, nested-object schema demands.

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?

"Prepare an existing-contract submission for the authenticated solver" gives a specific verb and resource, but "recheck stored bytes" is unexplained jargon, and the description never distinguishes this from the sibling `confirm_artifact_submission` or `prepare_bounty_action`. An agent can guess what it does but cannot tell which of the prepare/confirm pair applies.

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 line "This does not sign or broadcast. Sign only on first-party wallet pages" is a real usage boundary and a useful guardrail. However, there is no positive statement of when to call this versus `confirm_artifact_submission`, no prerequisite on the artifact already being uploaded, and no ordering guidance.

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