@evolith/agent-runtime

@evolith/agent-runtime

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Evolith Agent Runtime — a decoupled agentic layer that operates Evolith Core through Ports & Adapters (Hexagonal Architecture). It orchestrates, remembers, validates and executes Core capabilities through ports. It does not replace .harness (the official governed executor) and does not depend on Hermes or any LLM framework (those are optional, replaceable adapters).

Architecture docs: reference/architecture/agent-runtime · Decision: core/ADR-0102.

Install

This package is part of the Evolith monorepo workspaces. Build it with the rest of the graph (npm run build at the root) or standalone:

npm --workspace @evolith/agent-runtime run build
npm --workspace @evolith/agent-runtime test

Quickstart

import { createAgentRuntime, parseAgentRuntimeRequest } from '@evolith/agent-runtime';

const { runtime, deps } = createAgentRuntime(); // safe stub/in-memory adapters
const result = await runtime.handle(parseAgentRuntimeRequest({
  intent: 'validate_discovery_gate', tool: 'validate-discovery-gate',
  tenant: 'acme', initiative: 'init_001', phase: 'discovery', gate: 'prd_readiness',
  parameters: { requiredArtifacts: ['prd'], presentArtifacts: ['prd'] },
}));

A runnable example: examples/validate-discovery-gate.mjs.

Architecture

The package is hexagonal: domain (contracts, ports, tokens), application (the orchestration service + pure mappers), adapters (concrete tech), and a bootstrap factory. No framework or LLM is a domain dependency.

Ports

IAgentRuntime, IHarnessPort, ICoreEvaluationPort, IPolicyValidationPort, ITrackerTracePort, IMemoryPort, ISkillRegistryPort, ISchedulerPort, ICommunicationGatewayPort, IApprovalPort, IAgentEnginePort.

Adapters

Defaults are in-memory/stub. Real adapters: HarnessProcessAdapter (reads .harness/manifest.yaml), OpaCliPolicyValidationAdapter, HttpTrackerTraceAdapter, InProcessCoreEvaluationAdapter / HttpCoreEvaluationAdapter (run the real stateless Core, in-process or over the Core API), FileSchedulerAdapter / FileMemoryAdapter (durable, file-backed), and HermesAgentAdapter (optional engine).

Versioning & contract stability

This package follows SemVer. The public surface is the three subpath exports declared in package.json — . (main), ./ports, and ./adapters. The public-surface.spec.ts guard freezes the runtime value surface of . and ./adapters, so adding, removing or renaming a public export is a deliberate, reviewed change.

• ./ports is a type-only surface (port interfaces + canonical contract types). It is frozen at the type level — the consumer's tsc is the guard.
• schemaVersion on EvaluationResult (and any other versioned contract) is independent of the package version: it is bumped only on an incompatible change to that contract's shape, never for additive fields.
• Deprecation: a public export is marked @deprecated (naming its replacement) for at least one minor before removal; a removal or rename ships in a major, additive exports ship in a minor.

Scripts

npm run build                  # tsc -> dist/
npm test                       # jest
npm run example:discovery-gate # run the end-to-end example (after build)