Skill Claude CodeCodex
Extracts raw trace data from Perfetto traces, runs arbitrary SQL queries for custom follow-up analysis, and applies expert cognitive principles (Tiered Flow Analysis, Semantic Mismatch, Redundancy) to identify performance bottlenecks, structural redundancies, and tracer gaps. Use when you need to analyze a trace under…
Skill Claude CodeCodex
Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium. Use this skill when optimizing Java instrumentation test runtimes, resolving test state leaks, or migrating tests to batched execution.
Skill Claude CodeCodex
Guide for writing and converting Chromium Android unit tests across host Robolectric (chromejunittests) and on-device (chromepublicunittestapk) suites.
Skill Claude CodeCodex
Automates applying a bug fix from a bug report containing a diff and CL description. Supports processing multiple bugs in parallel using subagents.
Skill Claude CodeCodex
Automated Tracing & Performance Telemetry in Chromium using Perfetto and Telemetry benchmarks. Use when you need to launch the browser binary, execute a specific scenario/story, and collect Perfetto traces. Don't use for trace analysis (use analyzing-sql-traces).
Skill Claude CodeCodex
Bisect regressions or broken builds in the Chromium repository using deterministic binary search, checking out midpoint commits, syncing dependencies with gclient sync, compiling the target with autoninja, and querying the user for test results until the culprit commit is isolated.
Skill Claude CodeCodex
Refactor Chrome desktop Browser-scoped logic, such as Browser and BrowserWindow methods and state, into encapsulated feature controllers owned by BrowserWindowFeatures.
Skill Claude CodeCodex
Autonomous multi-agent performance optimization loop for Chromium and V8. Supports profile-seeded mode (analyzing Speedometer 3 / JetStream profiles via pprof or Sagacity MCP) and pattern-driven discovery mode (fan-out exploration of Blink and V8 macro-patterns grounded in historical wins and past rejected CLs).…
Skill Claude CodeCodex
Queries Chrome commit, version, release, and milestone metadata. Use when finding the first landed Chrome version of a commit, checking channel releases across platforms, inspecting milestone schedules and branch refs, or checking version containment.
Skill Claude CodeCodex
Toggle ChromeVox screen reader on ChromeOS devices and send raw keyboard input events. Use when debugging accessibility features on an external ChromeOS device, needing to enable or disable ChromeVox, or sending specific keys to the system via SSH.
Skill Claude CodeCodex
Use this skill when you need to link to files or specific lines in the Chromium codebase within a document intended for external sharing (e.g., Google Docs, Buganizer). This skill ensures links use the stable source.chromium.org format with line numbers and commit hashes for accessibility, even if the user doesn't…
Skill Claude CodeCodex
Use this skill to get a link to a Gerrit Changelist (CL) from a given commit hash in the Chromium repository. Use when you need to find the review discussion, comments, or related issues for a specific commit. Don't use for linking to files or code lines.
Skill Claude CodeCodex
Guide for disabling Chromium tests (C++ or WebUI). Use this skill when you need to disable a failing or flaky test case.
Skill Claude CodeCodex
Checks if a Chromium test suite is barred by cionly = True configuration on coverage trybots, which prevents the test suite from running automatically on Gerrit CQ runs and can cause underreported code coverage.
Skill Claude CodeCodex
Inspects LUCI build details using the inspectcoveragebuild.py script to validate code coverage configurations, test execution, and target file coverage.
Skill Claude CodeCodex
Triggers LUCI try jobs to generate code coverage data. Supports Mode 1 (standard git cl try for source CLs) and Mode 2 (led for custom builds).
Skill Claude CodeCodex
Validates Chromium generated builder configurations (gn-args.json) for code coverage correctness based on language context.
Skill Claude CodeCodex
Executes the phased, multi-skill code coverage debugging playbook for triaging underreported code coverage in the Gerrit Commit Queue (CQ).
Skill Claude CodeCodex
Verifies and initializes the Chromium development environment and dependencies required for running code coverage tools and services.
Skill Claude CodeCodex
Runs code coverage locally via Universal Test Runner (UTR) or helper scripts, mimicking LUCI trybots. Activate when CQ tryjobs fail or underreport coverage, to test local GN/recipe repairs before uploading, or to debug hermetic crashes.
Skill Claude CodeCodex
Triages Chrome code coverage bugs, initializes the environment, and delegates to the appropriate debugging sub-agent (CQ or CI) using a shared state file.
Skill Claude CodeCodex
Validates code coverage Swarming execution logs, CAS input/output profile artifacts, and profile generation environments to isolate remote trybot code coverage failures.
Skill Claude CodeCodex
Prepares a Gerrit CL for code coverage verification try jobs. Adds dummy comments to trigger builds, optimizes builder configs by isolating test suites, and commits all changes.
Skill Claude CodeCodex
Retrieves and analyzes Chromium per-CL code coverage data from the Findit API. Records per-CL coverage metrics for all modified source files and extracts unexecuted code lines.