Zeta

Zeta is an operating substrate for agents. It provides the zeta CLI, agent manifests, event stores, model adapters, prompt construction, capability execution, and runtime services.

Tool executors

The runtime loop stays in Zeta. An agent can select where its tool calls run through frontmatter:

executor:
  provider: local
  config: {}

local runs registered capabilities in the current process. Additional providers are installed through the zeta.tool_executors entry-point group. Zeta sets up one executor per provider, agent, and configuration, then reuses it across invocations while keeping the model loop local. Provider setup is asynchronous. Returned executors must support concurrent calls; Zeta awaits their aclose() method during worker shutdown.

Executor configuration is persisted in project snapshots and execution manifests. Store only secret references, profile names, or environment-variable names there—never credentials or secret values. Providers resolve references during setup. Config must contain JSON-compatible values with string object keys.