# Multi-Client E2E Matrix for Release Validation

- **Date**: 2026-02-23
- **Issue**: #69
- **Status**: `done`
- **Branch**: `feature/2026-02-23-issue-process-and-reco-benchmark`
- **Priority**: `high`

## Problem

Even with strong unit/integration coverage, release confidence would improve with real end-to-end
validation across supported MCP clients.

## Context

- Supported clients include Claude Code, Cursor, and Windsurf.
- Recent work added HTTP-native/per-client behavior and canonical matching.
- Compatibility regressions are expensive because they are discovered after release.

## Root Cause

No automated E2E client matrix exists for release-critical flows.

## Solution

Implemented release-focused E2E matrix tests covering supported clients:

1. Added `tests/test_release_client_matrix.py` with matrix coverage for:
   - Claude Code
   - Cursor
   - Windsurf
2. For each client, validated end-to-end critical flow:
   - `configure_server` (HTTP URL path, per-client config format)
   - `list_installed` (canonical lockfile enrichment)
   - `verify` (clean drift result)
   - `restore` (already-installed canonical skip; no reinstall)
3. Added multi-client single-command scenario in same suite:
   - one `configure_server` call targeting all clients
   - native HTTP for Claude Code + `mcp-remote` fallback for Cursor/Windsurf
   - `verify` clean on all clients against shared lockfile

## Files Changed

- `tests/test_release_client_matrix.py` — release E2E client matrix test suite
- `docs/issues/2026-02-23_69_e2e-client-matrix-release-validation.md` — issue tracking

## Verification

- [x] Matrix scenarios defined per client
- [x] E2E harness automated for release usage
- [x] Critical flows covered: configure/list/verify/restore
- [x] Docs with run instructions and prerequisites

Validation commands:

- `uv run pytest tests/test_release_client_matrix.py -q` -> PASS
- `uv run pytest tests/ -q` -> PASS

## Lessons Learned

(Optional — if something surprising was discovered, note it here and in MEMORY.md)
