execute_action_chain

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

With no annotations, the description carries full weight and does an excellent job. It discloses sequential execution, single observation at the end, stop_on_error default and behavior, fallback attempt ordering, automatic role/css/list-item variant appending, and that error messages include number of attempted locators. This is rich behavioral detail beyond the schema.

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 dense and information-rich, with every sentence adding value. It is somewhat long but well-structured, proceeding from core function to failure handling to fallback advice. Slightly verbose but justified by the tool's complexity.

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 complex multi-action nature of the tool, minimal annotations, and non-descriptive schema, the description covers essential context: execution order, return value, error handling, and fallback behavior. It doesn't explain output schema details, but mentions observation return type, which is sufficient. Overall it's complete enough for an agent to decide and invoke correctly.

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 0%, but description compensates by enumerating fields within each action (action, by, selector, iframe_selector, value, click_type, input_method, clear_first, press_enter, key, description) and explaining stop_on_error and fallbacks. It doesn't describe every parameter exhaustively, but provides enough meaning for an AI agent to construct valid calls.

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?

Description clearly states it's a batch action chain executing click/fill/select_option/press sequentially in one call, which distinguishes it from individual action tools like click_interact and fill_input. It doesn't explicitly name sibling alternatives but conveys the batch-execution purpose and return 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 states '用于减少 Agent 往返' (to reduce agent round-trips), which indicates when to use it instead of multiple individual calls. It also explains fallback usage for ambiguous actions, giving practical guidance for when to configure fallbacks, though it doesn't explicitly say 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.