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

The description discloses that the tool exchanges a signature for a JWT and that signing is not performed by the tool, which is a key behavioral trait. However, it does not detail error handling (e.g., invalid signature) or state whether the JWT is returned directly or stored, which would help the agent anticipate behavior. Since no annotations are provided, the description carries full burden for transparency.

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 two sentences, front-loaded with the purpose and action, followed by a clarifying statement on client-side signing. Every sentence adds value, no redundancy.

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?

For a tool with 4 parameters, full schema coverage, no output schema, and a clear authentication procedure, the description sufficiently explains the overall process and output (JWT for Bearer auth). It also references a sibling tool to contextualize use, making it complete for the task.

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% with clear parameter descriptions already present. The description adds minimal context beyond the schema, mostly repeating that signing is client-side and that ownerAddress refers to the EOA owner. Baseline of 3 is appropriate given high schema coverage.

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 clearly states the tool's purpose: exchanging an EIP-191 signature for a JWT for Bearer authentication on Smart Wallet API calls. It explicitly mentions a use case (fuse_smart_wallet_get_actions) and distinguishes the tool from other smart wallet tools by focusing on authentication.

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?

The description explains that signing happens client-side and this tool only submits the signed payload, implying the user must already have a signature. However, it does not explicitly state when to use this tool versus alternatives, nor does it provide exclusions or prerequisites like needing a deployed smart wallet.

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