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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=false), and the description adds genuinely useful context beyond them: the operation is free, requires no key, and performs two distinct checks (signature/on-chain anchor vs. transcript integrity). It stops short of describing failure modes or what a failed verification looks like.

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 tightly packed sentences with zero filler; the primary purpose (seal check) is front-loaded and the optional-parameter behavior plus cost/auth note follow in order of importance.

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?

There is no output schema, so the description would ideally indicate what a verification result looks like (pass/fail, evidence fields), and it does not. For a low-risk read-only tool with full schema coverage this is an acceptable but incomplete definition.

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 both parameters are already documented (room_id format, messages array format), making the baseline 3. The description adds only marginal semantics by explaining that passing messages triggers a completeness/unaltered check, but it adds nothing about room_id or about how a partial/incorrect transcript is treated.

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 (verify) and a precise object of verification: a closed room's seal (signature, on-chain anchor) and transcript completeness/integrity. This is clearly distinguishable from room_close/room_open/room_transcript by intent, though the description itself never names a sibling to contrast with.

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?

'Check a closed room's seal' implies it is used after room_close, and the conditional clause explains what happens when the optional messages param is supplied. However, there is no explicit when-to-use/when-not guidance or comparison against siblings such as room_transcript, so usage must be inferred.

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