@executioncontrolprotocol/harnesses-browser-nano

Browser Nano harness — catalog id @executioncontrolprotocol/harness-browser-nano. Tuned for on-device and small (~1B) models: short EQL replies, compact context, repair loop, identity primer.

Used by the browser demo and harness-owned eval matrices (Ollama gemma3:1b, Chrome Nano). Same harness binding (HARNESS_NANO_BINDING); the browser demo defaults to Chrome AI and may override the model provider at invoke.

Fixtures and evals

| Asset | Location | | ----- | -------- | | Prompt fixtures | fixtures/harness-prompts/*.prompt.json | | Eval cases | fixtures/eval-cases/*.cases.json (93 cases incl. chat + flow) | | Support fixtures | fixtures/workflows/, fixtures/runs/ | | Matrix tests | test/eval/ (Ollama), test/eval/browser/ (Chrome Nano) |

Run matrix: npm run eval:matrix -w @executioncontrolprotocol/harnesses-browser-nano

For stronger cloud models, add a separate harness package (e.g. @executioncontrolprotocol/harnesses-browser-nano-standard) with its own prompts and output shaping.

Invoke

import { BROWSER_NANO_HARNESS_CAPABILITY, HARNESS_TASKS } from "@executioncontrolprotocol/harnesses-browser-nano"

await ecp.invoke(BROWSER_NANO_HARNESS_CAPABILITY).with({
  task: HARNESS_TASKS.CHAT,
  message: "Create an echo workflow",
})

Tasks (all model outputs are EQL via @executioncontrolprotocol/format-eql):

| Task | Role | | ---- | ---- | | chat | Default multi-shot orchestrator: unfiltered intent, then contextualized authoring or assistant | | workflow-authoring | Create or patch @executioncontrolprotocol.workflow via EQL | | intent-classification | Route user messages (faq, general, workflow-create, workflow-patch) | | workflow-assistant | Unified assistant: ECP FAQ, identity, environment/capability help, run-aware Q&A (@executioncontrolprotocol.harness.reply) |

1B model policy: normalize garbled EQL, deterministic assistant/patch recovery, then repair loop (HARNESS_NANO_REPAIR). Eval matrix and browser demo share this binding.

Reusable harness authoring helpers live in @executioncontrolprotocol/core. This package adds product routing and workflow-specific capability hints.