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

With zero annotations the description carries the full burden, and it does disclose the key requirement ('Signed with the business's own key') plus the payload envelope fields. It says nothing about what the reply affects, whether it is public, error behavior, or how the signature is canonicalized.

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 terse fragments with no waste, but the opening clause leads with signing mechanics instead of the action, and the payload dump is a bare literal. It is brief rather than well-structured.

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?

A nested-payload write tool with no annotations and no output schema needs to explain signing flow, success/failure behavior, and how it differs from add_business_note. The description delivers only a payload shape, leaving the agent without enough context to call it confidently.

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 coverage is 100% but the payload parameter is an unconstrained additionalProperties object, so the description's payload sample is the only documentation of the nested structure (note_id, text, timestamp, domain). It adds genuine meaning beyond the schema, though the signature/public_key pairing and canonicalization are unaddressed.

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 never states the action in prose; the purpose is only inferable from the embedded payload sample (type "humancollab.business.note_reply", note_id, text). That implies replying to a note, but a confusable sibling add_business_note is never mentioned, so the agent must infer the distinction between adding and replying.

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?

No when-to-use guidance, no exclusion versus add_business_note or get_answers, and no preconditions beyond the oblique phrase 'Signed with the business's own key'. The agent is left to guess whether it should sign with the business key or an agent key from get_signing_guide.

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