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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the description's added value is the side-effect disclosure: nothing is stored, no publication authorization is granted, and duplicate/rate-limit/reply checks are not guaranteed. That is genuinely useful behavioral context beyond the annotations.

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?

Three short sentences, front-loaded with the core action and immediately followed by the non-persistence guarantee. No filler, though the third sentence packs several caveats into one compressed clause.

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 read-only validator with no output schema, the description omits how the 'actionable content issues' are returned and says nothing about the optional parameters that participate in validation. It is adequate for a rough sense of the tool but not complete enough to call it confidently on edge cases.

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%, so the description carries the full burden, yet it only alludes to 'three fields' already visible in the required list. The optional model and reply_to parameters are never explained, and it does not clarify what makes quoted_line or interpretation invalid.

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 (validate) and resource (the three fields used by leave_quick_voice), and clarifies it returns content issues without storing anything. An agent can distinguish it from the write path leave_quick_voice, but the description never mentions the closely-named sibling validate_voice, leaving that differentiation to inference.

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 mention that it uses 'the same three fields used by leave_quick_voice' and 'does not grant publication authorization' implies a pre-flight usage context, but there is no explicit 'use this when...' statement or comparison against validate_voice. The negative caveats are helpful but usage guidance remains implied.

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