---
plan: 03-03
phase: 03-ssh-execution
status: complete
completed: 2026-03-23
requirements-completed: [EXEC-02]
---

# 03-03 Summary: node_exec_all Parallel Fan-Out Tool

## What Was Built

`node_exec_all` MCP tool added to `vmcluster_mcp/exec/__init__.py` — fans out commands to all (or subset of) cluster nodes in parallel via `asyncio.gather`, returning aggregated `ExecAllResult` with per-node `ExecResult`, `all_succeeded`, and `failed_nodes`.

## Key Files

### Modified
- `vmcluster_mcp/exec/__init__.py` — `node_exec_all` appended (implemented in Wave 2 batch)

### Created
- `tests/test_node_exec_all.py` — 8 unit tests covering all require_all semantics, subset targeting, timeout handling, and asyncio.gather verification

## Decisions Made

- `failed_nodes` includes both non-zero exit_code AND timed_out nodes
- `require_all=True` (default): `success=False` + `PARTIAL_FAILURE` error with `recoverable=True`
- `require_all=False`: `success=True` even with partial failures — `failed_nodes` gives caller full info
- Empty `nodes=[]` treated same as `nodes=None` — targets all nodes
- `asyncio.gather` called once with all per-node coroutines for true parallelism

## Verification

- `pytest tests/test_node_exec_all.py -x` — 8/8 passed
- `pytest tests/ -x` — 147/147 passed (no regressions)
- `ruff check vmcluster_mcp/exec/__init__.py` — no errors
- `grep "asyncio.gather" vmcluster_mcp/exec/__init__.py` ✓
- `grep "PARTIAL_FAILURE" vmcluster_mcp/exec/__init__.py` ✓
- `grep "require_all" vmcluster_mcp/exec/__init__.py` ✓

## Self-Check: PASSED
