Fetch the CircleCI config for a project's latest pipeline (or a specific pipeline). Returns source YAML (as written) and compiled YAML (after orb expansion). Use this as the starting point for any config review.

Validate and compile a CircleCI config YAML string. Returns whether the config is valid, any errors, and the fully-expanded output YAML (with orbs resolved). Use this to verify a proposed config change before recommending it.

Identify the slowest and most credit-intensive jobs across all workflows in a project. Fetches Insights data for every workflow, then for every job within each workflow, and returns results sorted by total_credits_used. Use this to find resource_class over-provisioning, unnecessary serialisation, and credit hot-spots.

Return a combined health report for a specific workflow: duration/success/MTTR metrics, slowest and most-failed tests, and flaky tests. Use this to evaluate test splitting opportunities, flakiness, and overall reliability.

Return the job dependency graph (DAG) for a pipeline or workflow. Includes job requires/dependencies lists and (when include_resource_class is true) the actual resource_class that was assigned. Use this to identify unnecessary serialization, missing requires, and executor sizing.