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

Annotations only provide readOnlyHint=false and destructiveHint=false. The description adds valuable behavioral detail: on success it returns a session_token JWT to be used as a bearer token, unlocks owner-scoped tools, and describes chain-specific signature formats. It doesn't mention failure modes or challenge expiry, but the main side effects are disclosed.

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?

The description is dense but well-structured, front-loading the core purpose and flow before adding necessary chain-specific details. Every sentence carries useful information with no filler.

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?

Given no output schema and minimal annotations, the description covers the main call-token-usage loop, what the JWT unlocks, and signature requirements. It omits where challenge_id comes from and possible error/expiry behavior, but for a multi-chain auth tool it is largely complete.

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 must compensate. It thoroughly explains the 'signature' parameter (Solana Ed25519 base58/comma-separated bytes, EVM EIP-191 hex), but 'challenge_id' and 'wallet_address' are left implicit, relying on the challenge context and tool name for inference.

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 action, 'submit the signed challenge,' and ties it to finishing wallet registration/login while returning a JWT. This distinguishes it from sibling auth tools like auth_wallet_challenge (step 1) and other auth operations.

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?

It explicitly positions itself as 'Step 2' in an auth flow, signaling use after the challenge step, and explains how to use the returned token on subsequent requests. It doesn't name the exact prerequisite tool or state when not to use it, but the step framing gives clear context.

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