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

Annotations already declare readOnlyHint=false, idempotentHint=false, openWorldHint=true, so the non-read, non-idempotent nature is known. The description goes beyond them by disclosing that caller approval is required and that the returned token is sensitive, which is meaningful operational context. It stops short of describing token lifetime or what happens to the challenge after verification.

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 tight sentences with no filler; the core action is front-loaded and the approval/sensitivity caveat follows immediately. Every clause earns its place.

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?

With no output schema and 0% parameter coverage, the description is the only documentation an agent gets, yet it omits all four parameter meanings and the sequencing relative to start_wallet_auth. For a token-minting, security-sensitive tool this leaves important gaps.

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% across all four required parameters (challenge_id, source_wallet, signature, terms_version), so the description carries the full explanatory burden. It only vaguely gestures at 'challenge message' and 'wallet signature' and never explains terms_version or the id/wallet fields, leaving the agent to infer formats and relationships.

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 states a specific verb and resource ('Verify a wallet signature... return a wallet-bound access token'), so an agent can tell it is the second step of a wallet auth flow. It does not, however, name or distinguish itself from the sibling assetfare_start_wallet_auth, which is the obvious alternative an agent must choose between.

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: 'over the exact challenge message' hints that a challenge must already exist (i.e. start_wallet_auth ran first), but the description never states when to call this versus the start/read/verify siblings or what prerequisites must hold. It adds a single useful note ('Requires caller approval') but no explicit when-to-use routing.

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