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Robot Actions — Remote Device Control

Automation session commands

automation_session_commands
Read-onlyIdempotent

Read the step-by-step command history of a run — every action it performed, in order, with duration and pass/fail per step. THIS IS THE DEBUGGING TOOL: to explain why a run failed, fetch it with failuresOnly=true to land directly on the failing step, then read the steps immediately before it for context. When a failed run has NO failed command — an assertion failure, where every WebDriver call succeeded and the test reported the verdict itself — failuresOnly returns no steps and a whyNoFailedSteps block naming what the run reported and which step carried it, so an empty list is never mistaken for "nothing went wrong" and you do not need to re-fetch the whole history to find out. Each entry carries the error message when the step failed, and every element-scoped step (click, sendKeys, getText…) carries the locator that found its element plus the index of the find it came from — so a click at step 24 reads as the button it clicked, not an opaque id. On a run that is still going this returns the steps completed so far, so it is also how you answer "where has it got to?". For browser runs, follow up with session_console_logs / session_network_logs using the SAME session id to see whether a JS error or a failed request explains it. Output is summarised and capped, so ask for a filtered view rather than everything — when a step needs explaining, take its index to automation_session_step for the request/response bodies and the locator behind an element id.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMax steps to return (default 200, which is also the ceiling). Returns the LAST n steps, not the first — a run that fell over did so at the end. On a long run that means the window can exclude the very failure `firstFailureIndex` points at, so use failuresOnly=true to land on it instead of raising this.
sessionIdYesThe run's session id.
failuresOnlyNoReturn only steps that failed. Use this FIRST when debugging — it is usually one or two rows out of hundreds.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / limit / description
      Previous value: -"Max steps to return (default 200, which is also the ceiling)."New value: +"Max steps to return (default 200, which is also the ceiling). Returns the LAST n steps, not the first — a run that fell over did so at the end. On a long run that means the window can exclude the very failure `firstFailureIndex` points at, so use failuresOnly=true to land on it instead of raising this."
  2. Added

TDQS

A4.7/5.0
Behavior5/5

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds substantial behavior beyond that: output is summarised and capped, limit returns the LAST n steps, failuresOnly can produce an empty list paired with a whyNoFailedSteps block on assertion failures, and each returned step carries error messages and locator provenance.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is front-loaded with the core verb and resource, then immediately identifies the tool as the debugging entry point. Despite being lengthy, each sentence carries actionable information about failure handling, step content, ongoing runs, follow-up tools, and output capping.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description fully explains the return shape: ordered steps with duration and pass/fail, error messages on failed steps, locator/index data on element-scoped steps, empty-list semantics via whyNoFailedSteps, and partial results for ongoing runs. It also names the correct follow-up tool for per-step request/response details.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and the schema already explains limit behavior, failuresOnly usage, and sessionId. The description reinforces the debugging use of failuresOnly and the filtered-view preference, but does not add parameter syntax or constraints beyond what the schema provides, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: 'Read the step-by-step command history of a run' with duration and pass/fail per step. It distinguishes itself from siblings by positioning itself as 'THE DEBUGGING TOOL' and pointing to automation_session_step, session_console_logs, and session_network_logs for follow-up.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives explicit when-to-use guidance ('to explain why a run failed'), alternatives ('use failuresOnly=true to land directly on the failing step'), and when-to-follow-up with sibling tools using the SAME session id. It also covers the ongoing-run case ('where has it got to?') and warns against re-fetching everything.

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

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