mcpManager

# Playwright pool scaling (registry-backed) ## What “pool size” means The Playwright pool has **1 slot per configured upstream id**. If you want 20 concurrent isolated Playwright MCP instances, you need 20 upstream entries in `~/.Mx/registry.json` (or a generator that produces them). ## `playwright_pool_scale` (MCP tool) Scales pool capacity by cloning a template upstream into numbered upstreams (e.g. `playwright1..playwrightN`). Input: - `count` (required): desired number of cloned slots - `templateUpstreamId` (default: `playwright`): upstream to clone - `idPrefix` (default: `playwright`): clone id prefix - `prune` (default: `false`): when scaling down, remove clones (true) or disable them (false) - `dry_run` (default: `false`): show plan only - `reload` (default: `true`): reload registry in the current gateway process Notes: - The template upstream is **not** counted as a slot; slots are the clones. - Clones get safe per-slot cache env vars by default to avoid `npx` races when scaling up. ## Recommended setup - Prefer the compiled gateway binary (`~/.Mx/bin/Mx-gateway`) in Codex/Claude configs; avoid `bun --hot` for reliability. - Use `MX_PLAYWRIGHT_POOL=auto` (or leave it unset) so the pool auto-detects `playwright*` upstream ids. ## `playwright_pool_status` (MCP tool) Returns a superset of `playwright_pool_list`, including: - lock files + pid liveness/expiry - per-slot reasons when unavailable - detected `registry.playwright_pool` generator config and drift (if any)