AgentFabric

AgentFabric is an open-source governance and cost-observability control plane that authorises every AI agent decision before it runs and accounts for what it cost after. Wrap an agent you already have, from LangChain, CrewAI or a raw API call, and get a policy gate plus a per-decision ledger with no mesh to stand up. Every model and tool call passes a default-deny allow or deny check with a logged reason, and every invocation records inputs, tools, tokens, latency and dollar cost. An event-driven runtime lets agents collaborate through a bus rather than by calling each other, so loops are stopped by design. Apache-2.0 licensed and provider-agnostic, codified in the 12-Fabric App Rules.

• Policy before execution: default-deny allow or deny with a logged reason
• Per-decision ledger of tokens, latency and dollar cost
• Wrap existing LangChain, CrewAI or raw-API agents in a few lines
• Event-driven bus stops agent loops by design
• Full reconstructable trace of inputs, tools and memory
• Apache-2.0, provider-agnostic, pip install