Complete login

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

Annotations declare readOnlyHint=true, which conflicts with the description's claim that it 'persists a local session'—a side effect. While this is not a full write to a remote resource, it does modify local state. The description explicitly says 'never returns tokens,' which is useful, but the readOnly annotation is questionable. No other behavioral details like rate limits or idempotency are given.

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 short sentences, front-loaded with the purpose and the source of the challenge session, and the critical side-effect (persists session, never returns tokens) is clearly stated. No wasted words.

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?

There is an output schema (not provided in the input but flagged as having one), so the return value is likely documented. The description could mention whether login is idempotent or what happens if OTP is invalid, but for a login completion tool with clear parameters, it is adequate. The possible mismatch with readOnlyHint is a gap.

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 100%, so the schema already details each parameter. The description adds minimal value: it names the OTP and challenge_session but does not provide format or relationship details beyond the schema. Since the schema covers everything, baseline 3 is appropriate.

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 states a specific verb ('Complete Benepass login') with a clear resource lineage ('from start_login'), and distinguishes itself by noting it persists a session and never returns tokens. It clearly differentiates from sibling start_login and auth_status.

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?

It mentions the prerequisite 'challenge session from start_login' and implies the tool is the second step in a two-step login flow. It does not explicitly mention when not to use it (e.g., after login is complete, use auth_status instead), but the context is reasonably clear.

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