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

Annotations mark this as a non-read-only, non-destructive, open-world operation. The description adds real context beyond that: the code is short-lived and grants read-only access, and it enumerates concrete side effects that do NOT occur. It stops short of stating auth requirements or what success returns.

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?

Two sentences, front-loaded with the action and scope, then a compact exclusion list. Efficient, though the second sentence is somewhat negation-heavy rather than adding positive usage detail.

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 2-parameter tool with annotations and no output schema, the description covers what the tool does, its limits, and the non-effects an agent might otherwise assume. Missing only return-behavior and auth specifics, which is acceptable given annotation coverage.

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 both parameters (code, confirm_browser_sign_in) are fully documented in the schema. The description contributes only the 'short-lived, read-only' characterization of the code, 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 specific verb (sign/approve) and resource (Grynvault account handoff code) and clarifies the outcome (the browser tab receives its own dashboard). It also fences scope against siblings by ruling out invoice creation, event publishing, settlement changes, and wallet custody, though it does not name a specific alternative tool.

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?

Usage is only implied: the negative list (does not create invoice, publish event, etc.) steers away from some siblings, and the schema param hints at the 'user asked to sign the displayed code' trigger. There is no explicit when-to-use or named alternative in the description text itself.

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