Mecatl

v0.0.33 · Apache-2.0 · Open source

The open
cloud-native
harness for
developers who
are building
platforms

We blew up the harness and then put it back together: more secure, more scalable, more extensible.

brew install stacklok/tap/mecatl

then: mecatui --mock offline, no API keyDownload v0.0.33Install guide

Mecatito, the Mecatl mascot: a Xoloitzcuintli puppy wearing a teal rope collar

Built from the ground up to run in the cloud. Get your harness off your laptop and run fleets of agents anywhere.

01 Outcomes

What can you do with Mecatl?

  1. Get your harness off the desktop

    Start locally, then deploy a fleet of agents on Kubernetes with your choice of cloud and model provider.

  2. Separate the agent loop from the sandbox

    Separate control from execution to keep bad code outside your trust boundary.

  3. Pick and choose what you need

    Use Mecatl’s library of components to assemble a custom harness.

  4. Control what your agents can do

    Set permissions and choose which tool calls require your approval.

Mecatl (MEH-kah-tl) is hard to say, but easy to use.

02 Capabilities

What you don't have to build

Mecatl gives you the hard parts. Use what you need.

  1. Complete agent loop

    Multi-turn reasoning, tool dispatch, compaction, permission gating, and event streaming are built in.

  2. Port model

    Modular design. Swap LLM backends, persistence, distributed locks, or permission logic without touching the engine. Reference adapters included for every port.

  3. Cloud-native by design

    Disposable process, externalized state, durable event record. mecak8s pre-wires Redis and Kubernetes leases so you can scale stateless pods from day one.

  4. Importable engine

    github.com/stacklok/mecatl/engine is its own Go module with a tiny dependency closure. Embed the loop directly, no server required.

  5. Full observability

    OpenTelemetry traces, LLM resilience decorator, slow-turn ring buffer, and an MCP-accessible perf server.

  6. Identity at the core

    Every agent acts under a verifiable identity. Mecatl stamps identity at every agent action, not just at the login gate.

03 Deployment

Four deployment options to get you started

04 Stacklok

Mecatl is part of Stacklok's commitment to building a more open alternative to vertically integrated agent stacks.

Featured project

ToolHive

The open source MCP platform trusted by enterprises, securing 10M tool calls each month.

ToolHive on GitHub

One line to install.

brew install stacklok/tap/mecatl

then: mecatui --mock offline, no API keyDownload v0.0.33Install guideExplore the docs

brew install stacklok/tap/mecatl