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

Annotations already cover the safety profile (write, non-idempotent, non-destructive, open-world), and the description adds real context: the endpoint path, the fact that it mints a bearer token, and what that token authorizes downstream. It does not mention token expiry/reuse semantics or failure modes, but with annotations present this is solid.

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?

One dense sentence that front-loads the when-to-use clause before the mechanics. No filler, though cramming payload, endpoint, return shape, and downstream uses into a single sentence makes it slightly harder to scan.

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 usefully enumerates the return fields ({token, wallet, expiresAt}) and names the endpoint. Error behavior and the ts/nonce semantics are the remaining gaps, but for a 4-parameter auth handshake this is nearly 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?

At 50% schema coverage only wallet and signature are documented (the latter as a personal_sign over the exact message); ts and nonce rely on the bare schema types. The description merely restates the payload keys in the same order as the schema, adding no meaning to the undocumented parameters.

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+resource (opens a session by POSTing signed credentials to /api/game/session) and enumerates both the payload and the return shape. It also distinguishes the step from its prerequisite sibling memeswap_session_message by saying to use it after signing the session message.

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 an explicit precondition ('after signing the session message') and states what the resulting token unlocks (social login, earn summary, reel posts). It does not name alternative tools or say when not to call it, so it falls just short of full routing guidance.

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