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

With no annotations provided, the description carries the burden of disclosing behavior. It explicitly enumerates the verification steps (leaf hash re-derivation, Ed25519 signature check, audit path check) and mentions statelessness. It also clarifies acceptable input variants, which adds useful behavioral context beyond the schema. However, it does not describe potential failure responses or edge cases, so a 4 is appropriate.

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 concise, with a front-loaded 'Stateless verification' opening followed by three concrete steps and input format notes. Every sentence contributes useful information, and the entire description is brief yet informative. The final sentence about the proof envelope is slightly vague but does not waste space.

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 complexity of cryptographic verification and the absence of annotations and output schema, the description covers the core verification logic and input flexibility well. It lacks explicit mention of return values or error conditions, but the 'proof envelope' hint provides some indication. Considering the rich sibling context and the tool's focused purpose, it is reasonably complete.

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?

The schema provides no description for the single 'envelope' parameter (0% coverage). The description compensates by explaining that the parameter can be a full MCP envelope or a bare signed payload, and mentions the proof envelope wrapper. This adds meaningful semantic information about the parameter's accepted forms, though it remains slightly ambiguous.

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 identifies the tool as a verification operation with specific steps: re-deriving the leaf hash, checking the Ed25519 signature, and checking the audit path. It names the exact resource (snapshot signature) and distinguishes itself from the sibling get_* tools, which are all retrieval operations.

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 provides clear context by stating it is a stateless verification and noting it accepts two input formats. It implies usage after acquiring a signed snapshot, though it does not explicitly name alternatives or state when not to use it. This is clear context without exclusions, warranting a 4.

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