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

With no annotations, the description carries the full burden, and it does disclose real behavior: byte-exact retrieval, checksum re-verification, and that unknown_artifact is a clean error. It omits offset/limit boundary behavior, pagination semantics, and any auth or rate-limit context, so it is helpful but incomplete.

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?

Two short sentences, front-loaded with the core action and followed by the integrity guarantee and error case. Nothing is padded, though the terseness borders on cryptic for jargon like 'spilled payload'.

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 3-parameter tool with no annotations and no output schema, the description covers the purpose, integrity guarantee, and one error case, but leaves limit/offset semantics and slice-size defaults unaddressed, so an agent could still mis-invoke it.

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 0% for three parameters. The description hints that the call produces a 'narrower slice' (mapping loosely to limit/offset) and references artifact_id via the unknown_artifact error, but gives no format, units, or boundary meaning for any of the three.

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+resource: re-fetching a narrower slice of your own spilled payload. The 'your own spilled payload' framing implicitly separates it from shape_result and verify_receipt, though it doesn't name them explicitly, so it falls just short of the top band.

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: 'narrower slice of your own spilled payload' tells the agent this follows a prior spill and narrows it, but there is no explicit when-to-use, when-not, or named alternative among the siblings. Adequate but leaves routing to inference.

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