Glossary
What is an
agent harness?
An agent harness is the execution layer around the model that turns reasoning output into real operations. It provides files, terminals, browser control, tool routing, permission boundaries, and runtime rules that determine what actions are possible at each step. The model decides what should happen; the harness governs what can happen safely and predictably in the environment. This layer is critical for production reliability because it controls access, sequencing, and failure handling across tool calls. Without a well-defined harness, agent behavior becomes fragile, hard to audit, and difficult to reproduce across teams or runs.
Why it matters
The model decides what to do, but the harness determines what it can actually do in practice. That includes which tools are discoverable, which files are visible, what permissions are granted, and which action sequences are allowed in the execution environment. This separation is what makes policy, safety, and observability enforceable without degrading model flexibility.
AnyCap fits inside that harness as a capability runtime. It gives the harness a clean, consistent way to expose multimodal actions through one interface, rather than stitching separate provider integrations into every workflow. The result is clearer operational boundaries, easier debugging, and faster reuse across different agent shells.