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

LHIC, a local-first browser automation runtime, achieves sub-35ms latency and 100% success on common tasks by bypassing LLMs with a fast-path execution engine. Its self-healing semantic locators outperform traditional selectors by 80% under layout changes, and enterprise features include AWS/GCP KMS integration, AES-256 encryption, and distributed account-level locking.

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.