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

Annotations only cover the generic mutation profile (readOnlyHint=false, idempotentHint=false, destructiveHint=false). The description adds a genuinely important behavioral fact the annotations cannot convey: the plaintext is returned EXACTLY ONCE and must be captured immediately. It still omits auth/permission requirements and whether the token is scoped to anything beyond "stage-only".

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 sentences, zero waste, and the operation plus its one critical caveat are both front-loaded. Nothing redundant with the title or schema.

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?

An output schema exists, so return values need no explanation, and the one-shot plaintext behavior is the essential missing piece that the description supplies. Remaining gaps are minor: the optional `name` argument and any prerequisite/auth context for minting a deployment token.

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% and the single `name` parameter (optional, maxLength 80) is never mentioned in the description. "For a deployment" gestures vaguely at naming but gives no guidance on the identifier, so the description does not compensate for the coverage gap.

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 ("Mint"), a specific resource (fsync_ token), and a distinguishing scope constraint ("stage-only ... for a deployment"). An agent can separate this from fillo_list_sync_tokens and fillo_revoke_sync_token without opening any schema.

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?

Usage is only implied: the description tells the agent what to do with the token after creation (hand it to the user or CI secret store), which situates the tool in a CI/deployment workflow, but it never states when to mint one, what prerequisites exist, or why one would choose this over the revoke/list siblings.

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