Request human handoff

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

Annotations give readOnlyHint=false (a mutating call) and openWorldHint=false. The description adds real context beyond that: it binds state to a caller-owned task, scopes the handoff to a generation, and requires an existing browser session. It does not say what state the session enters after the handoff, whether the caller must later call captcha_resume, or any timing/auth constraints. No contradiction with annotations.

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?

It is a single sentence with no padding, which is good. But it is dense with undefined internal jargon ('generation-scoped', 'caller-owned task') and places the binding clause before the primary action, so the reader must parse twice to find the point.

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?

This is a mutation tool with no output schema and only a readOnlyHint annotation, so the description carries the burden. It omits the handoff lifecycle an agent needs: what the session state becomes, how long the handoff is valid, and how to continue afterward (presumably via captcha_resume). Given the six-tool captcha family, that omission leaves the agent unable to call it correctly in context.

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% across both parameters, so task_id and session_id are already fully documented in the schema. The description mentions the task binding and the existing session but adds no format, validity, or lifecycle detail beyond the schema. 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 concrete action (create a human handoff) and the resource it affects (the current captcha challenge, bound to a caller-owned task in an existing browser session). That is more than a restatement of the title. However, it does not distinguish this tool from the five siblings (resume, analyze, wait, complete, inspect), so an agent cannot route between them from this text alone.

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?

There is no explicit when-to-use guidance, no when-not-to, and no mention of any sibling as an alternative. The phrase 'create a generation-scoped human handoff' hints at a workflow state but never tells the agent which conditions should trigger a handoff versus, say, captcha_resume or captcha_wait.

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