Liveness check for agent-mcp-hub — returns "pong". Read-only, no side effects.

List the wrapped coding-agent CLIs and whether each can actually run (edits nothing). Each entry reports installed (binary resolves on PATH with the exec bit) and usable (a probe succeeded), plus a reason when it cannot run; available mirrors usable. A CLI can be installed but unusable — codex exits 0 from --version even when its home is unwritable and no real run can succeed — so prefer usable. Read-only; call this first to choose an agent before delegating.

OpenAI Codex — a terminal coding agent (GPT/o-series) that autonomously reads and edits files to implement, refactor, and fix code. Runs the codex CLI non-interactively in cwd — it can read and edit files there and may take time or use the agent's own model quota — and returns its output. On common failures returns a classified, actionable error (not installed / not authenticated with the exact login command / not configured / timed out / busy / output-limit); other non-zero exits return a clipped stderr/stdout tail. Check availability with list_agents first.

Claude Code — Anthropic's coding agent for complex implementation, refactoring, and code review. Runs the claude CLI non-interactively in cwd — it can read and edit files there and may take time or use the agent's own model quota — and returns its output. On common failures returns a classified, actionable error (not installed / not authenticated with the exact login command / not configured / timed out / busy / output-limit); other non-zero exits return a clipped stderr/stdout tail. Check availability with list_agents first.

Fan the SAME prompt out to every enabled agent concurrently and return each agent's answer, labelled per agent — for comparing agents or cross-checking a result. Spawns every CLI (each can read/edit files in cwd) so it can be slow or use several agents' quotas; one confirmation covers the whole batch.

Run the runner agent in cwd (which edits files), capture the concrete git diff of the change, then have the reviewer agent judge it and return a PASS/WARN/FAIL verdict along with the runner output, the diff, and the review. Requires a git worktree. Newly-created (untracked) files are reviewed by their contents too (bounded per file), not just by name. The diff may include pre-existing changes if the worktree was already dirty.