managed_sign_in

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

Annotations already disclose the operation is not read-only, is open-world, and is non-destructive, so the safety profile is covered. The description adds only that the payload is encrypted, and omits any behavioral context such as what session state is established, whether prior payload construction is required, or how failures are surfaced.

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?

A single front-loaded sentence with no wasted words. It is tight, though this brevity is partly what leaves the usage and prerequisite gaps unaddressed.

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 sign-in entry point with no output schema, the description should indicate what a successful call yields (e.g., session/auth token) and that build_sign_in_payload likely precedes it; neither is covered. Annotations and the schema carry the rest, so this is adequate but with clear gaps.

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%, and the schema documents both computedData (AES-256-CBC encrypted payload) and chainId (with concrete chain values). The description's phrase 'encrypted computedData payload' simply restates the schema wording and adds no format, ordering, or value guidance beyond it.

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 in) and a named target (GDEX managed-custody system), which distinguishes it from generic siblings like auth_login, oauth_login and build_sign_in_payload. However, the description never explicitly contrasts itself with those sibling auth tools, so an agent must infer which sign-in path applies.

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?

No when-to-use guidance, no prerequisites, and no mention of the adjacent auth tools (auth_login, oauth_login, generate_session_keypair, build_sign_in_payload) that a caller would have to choose between. The agent gets no explicit cue for selecting this tool over alternatives.

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