Open-source governance and policy layer for AI coding-agent harnesses with evidence gates, verification receipts, hooks and compatibility adapters.
Fusengine Harness is an MIT-licensed governance and policy layer for AI coding agents. It packages a reusable policy core with evidence-backed gates, verification receipts, lesson memory, caching, lifecycle tracking and adapter logic rather than providing a model or coding assistant itself. The current repository documents hook adapters for Claude Code, Codex, Cursor, Cline, Gemini CLI and Hermes, plus CLI-mode use for Aider, Windsurf and OpenHands. 1
The package can initialize harness-specific hook wiring, evaluate file and command policies, record agent/reference activity, gate staged changes, coordinate PRD task ownership, and expose reusable subpath modules for policy, runtime, tracking, refs, cache and memory. These are documented project capabilities, not AiToolMap hands-on findings. 1
Fusengine Harness is free open-source software under the MIT License. No separate paid software tier was verified. The CLI installs from npm and the library can be consumed through Bun; users still need the coding-agent harnesses and any model/API access those products require. 1
The repository includes platform-specific notification handling for macOS, Linux and Windows and documents a single package intended to bridge multiple agent environments. 1
The strongest trust signal is not a third-party certification but the repository's unusually specific disclosure of enforcement ceilings. It states that cross-harness behavior is not identical: Cursor file-edit hooks are advisory after the edit, Codex can fail to enforce a correct upstream deny, some richer lifecycle events require extra wiring, Hermes lifecycle coverage is only partly verified, and the CONFIRM mechanism is explicitly not a security boundary. 1
The repository reports 662 tests across 120 files and CI that runs tests plus typechecking. Those are useful engineering signals but remain first-party evidence. The canonical 50-source panel found no exact independent review, benchmark or eligible numeric rating corpus. No AiToolMap hands-on testing was performed. 1
Fusengine Harness best fits developers and platform teams already using coding agents who want reusable governance across projects and agent vendors: policy guards, evidence freshness, receipts, memory, lifecycle hooks and a common operating model. 1
It is less suitable for users expecting a fully sandboxed security boundary, identical enforcement across every supported harness, or independently validated performance and reliability claims.
MIT license; broad adapter surface; explicit policy and lifecycle architecture; fail-closed custom guard chain; evidence/receipt tooling; documented pinning and stale-runtime protections; extensive first-party test surface; unusually candid compatibility and security caveats. 1
host-harness limitations directly cap enforcement; some lifecycle coverage requires manual or marketplace wiring; Cursor is advisory for edits; Codex enforcement includes an upstream caveat; Hermes coverage remains partly unverified; no exact independent panel evidence was found. 1
Products matched by shared tasks, audience, workflow, product type and capabilities.