List the workflows available in this server's workflow directory. Returns an object with count and workflows (one entry per workflow, each containing name (its declared name), description, path (the YAML file), and parameters (declared inputs with types and defaults)). Call this first to discover which workflows exist and what inputs each accepts before calling dry_run_workflow or run_workflow. Read-only: it only reads YAML files and never executes anything. Takes no arguments.

Validate a single workflow YAML file without running it. Give the file path; returns {valid, error_count, warning_count, issues[]}, where each issue has a level (error/warning/info), message, and optional line, step, and hint. Use this to check a workflow the agent authored or edited before running it, or to explain why a workflow is malformed. Read-only: no tasks run and nothing is written.

Preview what a workflow would do without executing any task. Give a workflow (a name from list_workflows or a file path) and optional params; returns {status, outputs, preview} where preview is a human-readable list of the steps that would run with their resolved inputs (the same information as the CLI's --dry-run). Use this to inspect side effects (shell commands, file writes, HTTP calls) before running for real. It does not execute any task — no shell or Python runs and none of the workflow's own side effects occur; only ephemeral logs are written to a temporary workspace.

Execute a workflow and return its results. Give a workflow (a name from list_workflows or a file path) and optional params; runs it to completion and returns {status, workflow, outputs} where outputs maps each step name to its result. DESTRUCTIVE: a workflow may run arbitrary shell commands and Python, write files, and make HTTP requests — call dry_run_workflow first if you need to preview side effects, and only run workflows you trust.