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

The description clearly discloses that the signer is not authorized by this call, that the wallet owner must approve in their own browser, and that approval is wallet-signature gated and never in-chat. This adds substantial behavioral context beyond the annotations and is consistent with readOnlyHint=false and idempotentHint=false.

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 compact and front-loaded with the core purpose, and every sentence adds useful framing or flow guidance. The incomplete parenthetical '(Lane 2 wallet -- )' and the long semicolon-heavy sentence file are minor readability issues that keep it from a perfect score.

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?

The description gives a complete high-level flow: when to call, what happens, who must approve, and what to do next. The output schema can cover confirmation-URL and device_code details, so the main residual gap is the unaddressed optional input parameters.

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%, yet the description does not explain any of the six input parameters. wallet_address and signer_pubkey are inferable from their names, but label, caller_id, expires_at, and capabilities have no added meaning, and even the mention of 'device_code' refers to a different tool's parameter rather than this tool's inputs.

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 opens with a specific action: 'Open the browser-confirmation handshake to authorize a session signer,' then narrows the exact scope by stating the tool does NOT authorize the signer and returns a confirmation URL. It also names sibling tools like authorize_session_signer and poll_session_signer_authorization, making the intended function unambiguous.

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 trigger condition is explicit: call this when authorize_session_signer refuses with BROWSER_CONFIRMATION_REQUIRED. It further instructs the agent to follow up with poll_session_signer_authorization(device_code), and clarifies that this tool is not the authorization step itself.

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