# LHIC – A local-first browser agent with 30ms latency and $0 LLM cost

> Source: <https://github.com/chengmatt416/LHIC>
> Published: 2026-07-15 18:45:36+00:00

LHIC is a secure, high-performance, local-first browser automation runtime designed to translate human intent into deterministic, verifiable computer actions.

**Fast Path Execution Engine**: Executes common browser tasks (login, forms, search, navigation) locally using Playwright and high-level skills, bypassing LLMs entirely. Achieving**100% Fast Path success rate** and**< 35ms median latency** on standard tasks.**Self-Healing Semantic Locators**: Immune to typical website updates. Outperforms traditional static CSS/XPath selectors by**+80% success rate** under layout modifications.**State-of-the-Art Security & KMS**:** KmsKeyManager**: Integrates AWS KMS, GCP KMS, and HashiCorp Vault key verification for high-risk actions.** AES-256-GCM Encryption**: Secure software-based database-level static encryption for sensitive user cookies and sessions.** PII & Credential Guard**: Automatically redacts credentials, passwords, and personally identifiable information from all system traces.

**Enterprise Concurrency & Durability**:** BrowserPool**: Thread-safe Chromium context pooling with pre-warming and state purification.** Account-level Locking**: Distributed SQL-based queue preventing overlapping executions on identical accounts.** Durable Workflows**: Resilient workflow execution with step recovery and state-saving.

**VNC Screencast Streaming**: CDP-based real-time JPEG screen frame broadcast at configurable frame rates (e.g., 10fps) for remote intervention.** APM Observability**: OpenTelemetry (OTLP) exporting mapping tracking spans to central log systems.

`packages/schema`

: Core Zod schemas and validation types.`packages/browser`

: Playwright CDP wrappers, Screencast, and BrowserPool.`packages/verifier`

: Dynamic DOM, URL, and file download verification.`packages/trace`

: Redacted JSONL event logs and OTel APM export.`packages/memory`

: SQLite workflow state and resilient selector memory.`packages/security`

: KMS key managers, PII redaction, and database encryption.`packages/skills`

: Fault-tolerant pre-defined browser skills.`packages/controller`

: Decision routing, confidence scorer, and Slow Path interface.`apps/cli`

: LHIC CLI command entrypoint (`lhic`

).`apps/mcp-server`

: Standard Model Context Protocol stdio entrypoint and HTTP API Control Plane.

Install dependencies:

```
npm install
npm run build
```

Run preflight environment verification:

```
npm run preflight
```

Run action with human approval:

```
npx tsx apps/cli/src/main.ts run action <action-file> [approval-file]
```

Run internal regression benchmarks:

```
npm run bench:internal
```

Run selector resilience simulation:

```
npm run bench:simulate
```

Business Source License 1.1 (BSL) - see introduction website for more details.