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

Adds substantial behavior beyond the annotations (readOnlyHint=false, openWorldHint=true, destructiveHint=false): the server does not cache the JWT, the token is scoped to the signing walletAddress and mismatched use is rejected upstream, expiry is exposed via the response's expiresAt, and there are concrete rate limits (5/min, one per 12s). This is exactly the operational context annotations cannot carry.

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?

Front-loads the deprecation flag, then purpose, then the auth-flow contract; no sentence is filler. It runs long for a single call, but the length is driven by genuinely necessary multi-step auth and rate-limit detail rather than padding.

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, the description carries the burden of return values and does so (jwt, expiresAt decoded from the JWT exp claim), plus scope, reuse, and throttling. An agent has everything needed to call it correctly and to handle the result.

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%, so chain, signature, and walletAddress are already fully documented in the schema, including chain semantics for EOA vs smart-contract wallets. The description adds no parameter-level detail of its own, so the baseline 3 applies.

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 concrete verb and resource: 'Exchange a signed SIWE challenge message (from get_auth_challenge) for a JWT scoped to that wallet.' It also names the upstream source tool and the downstream consumers (submit_deposit/submit_withdrawal/submit_config), so it is distinguishable from every sibling without opening a schema. The [DEPRECATED] prefix makes the tool's standing explicit.

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?

Gives clear sequencing (obtain challenge via get_auth_challenge, use returned jwt in the submit_* calls) and explicitly instructs reuse rather than re-authentication. It does not, however, say when *not* to call it or name a replacement for the deprecated path, which is the one thing an agent most needs once it sees [DEPRECATED].

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