validation_chain

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

With no annotations provided, the description carries full burden. It discloses automatic error checking per step, immediate termination on error, alias support for type/action, and the 5-step requirement. However, it does not explicitly state that operations like click and type modify page state (destructive hint), though this is implied.

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 relatively concise, starting with the purpose and then detailing behavior. It could be slightly more streamlined but effectively communicates the key points without unnecessary 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?

Given the nested object (steps) and 6 parameters, the description provides adequate context for the input behavior but does not describe the output report format. Since there is no output schema, mentioning what the report contains (e.g., step results, errors, screenshots) would improve completeness.

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%, but the description adds meaning beyond the schema: it explains that step.type and step.action are aliases, clarifies the purpose of each step type, and notes the refusal behavior when required steps are missing. This helps the agent understand the step structure and constraints.

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 clearly states it's a 'complete functional chain closed-loop verification tool' that executes navigate/click/type/wait/validate steps in order, checks errors, and produces a report. It distinguishes itself from siblings like browser_chain and validation_flow by specifying the exact step types and error-checking behavior.

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 description implies usage for full 5-step chain validation and states it refuses execution if required steps are missing. However, it does not explicitly contrast with alternative tools like browser_step or validation_flow for simpler cases, or state when NOT to use it.

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