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Open-Source AI Harnesses

A framework for orchestrating tool-calling language model agents — routing, sandboxing, evaluating — that ships under an open license.

Reviewed 2026-09-01 by M. Foremski

Criteria

Criterion What it separates Evidence
License obligations MIT / Apache-2.0 / AGPL — what the license requires of a production deployment doc · doc
Tool-calling protocol MCP, function-calling, custom — and whether arbitrary tools plug in doc · tested
Sandbox & isolation model How agent execution is contained — containers, V8 isolates, process-level doc · tested
Eval harness maturity Built-in evaluation tooling — benchmarks, scorers, test fixtures doc · tested
Model agnosticism Number of model providers supported without a custom adapter integration list · doc
Self-host footprint What it takes to run — container image size, dependencies, minimum infra doc · tested