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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so the safety profile is covered. The description adds real value by disclosing the three concrete checks performed and that re-verification is repeatable ('re-checks'), but says nothing about failure modes, error behavior, or whether missing/expired timestamps cause an error.

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?

Front-loads the cost signal and then the verification checks in one dense sentence, with no wasted prose. The trailing 'MCP tool: `verify_snapshot`.' is pure redundancy that duplicates the name.

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 exists, so the description carries the burden of explaining what a verification returns; it describes the checks but not the result shape (per-check pass/fail, overall verdict, or what a signature mismatch yields). For a two-parameter, no-output-schema verification tool this is adequate but leaves a meaningful gap.

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?

With 50% schema coverage, the description must compensate. It restates the sha256 parameter's meaning (already documented in the schema) but never explains what 'id' identifies or its format, and offers no syntax detail beyond what is structured. Net added meaning over the schema is minimal.

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 (re-checks) and resource (a stored snapshot) and enumerates exactly what is verified: field hashes against the timestamped record, the timestamp authority's signature, and an optional supplied content hash. An agent can tell this is a verification tool rather than a creation or citation tool, though it never explicitly contrasts itself with verify_timestamp or verify_provenance.

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?

'Free' signals no cost barrier and the optional sha256 check hints at when to supply extra input, but there is no explicit guidance on when to use this versus verify_timestamp, verify_provenance, or snapshot_citation, which are the obvious adjacent choices. Usage is implied by the description of what is checked, not stated as a selection rule.

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