One router in front of every MCP server.
Engur sits between your AI coding agents and a sprawling catalog of MCP tools, exposing a tiny fixed surface. Your agent’s context stays flat no matter how many servers you wire in.
No spam — one email at launch, then never again.
macOS 13+ · 7-day free trial · then $19/year
// one router, one flat tool surface
agent → search_tools("deploy a worker")
↳ matched cloudflare__worker_deploy (schema loaded transiently)
agent → execute_tool(cloudflare__worker_deploy)
↳ spawned server on demand · reaped when idle
01search_tools
02execute_tool
03list_servers
04use_server
05release_server
06list_skills
07read_skill
08search_skills
8 stable tools · catalog of any size · flat context
Wires the router across the agents you already use
Big toolbelt, flat context
Point one agent at one router instead of a dozen MCP servers. Child tool schemas only enter context when they’re searched for — never all at once.
Expose a fixed surface
The router presents 8 stable tools — search, execute, use/release server, skills — regardless of how large the underlying catalog grows.
Search, don’t preload
search_tools is served from cached schemas with zero child processes. Schemas enter context transiently, only when an agent actually needs them.
Spawn lazily, reap idle
A downstream server is spawned only on execute_tool / use_server, then reaped when idle. No Node runtime, pure Swift 6 concurrency.
Built for people who run agents all day
Flat tool surface
A constant 8-tool interface in front of any number of MCP servers. Context cost stays flat as your catalog explodes.
Lazy & cache-first
Search hits cached schemas instantly. Servers spawn only on demand and idle ones are reaped automatically.
Pure Swift 6, no Node
Native binary with strict concurrency. No npm runtime to manage — it spawns npx/uvx children only when a tool actually runs.
Wire every agent
One control plane for Claude, Codex, Antigravity and more. Manage shared rules and skills in one place.
Offline-first & private
State lives under ~/.agent on your machine. Engur validates on a sane cadence — no constant phone-home.
Open-source engine
The router is Apache-2.0 and auditable. The app is the polished control plane on top.
Simple, honest pricing
Try every feature free for 7 days. No card tricks, cancel whenever.
Then $19 per year after your trial. Cancel anytime.
- The full Engur macOS app
- Native MCP semantic router — flat tool surface
- Wire one router across Claude, Codex & Antigravity
- Shared rules & skills across every agent
- Automatic updates (Sparkle)
- Works offline — no constant phone-home
The router engine is open-source (Apache-2.0) and free forever. Your subscription funds the native macOS app and its updates — cancel anytime, keep access until your year ends.
Flatten your agent’s context today.
Seven days free. Then $19 a year. Cancel anytime.
No spam — one email at launch, then never again.