LexQ

The decision platform for engineering teams. CLI and MCP server for LexQ — move business rules out of your deploy pipeline, prove every change with simulation, and ship without a git push.

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npm License

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Why LexQ?

Your business rules — pricing, promotions, fee logic, eligibility checks — change often. But every change ships through the same PR → review → staging → deploy cycle as your core application code. A one-line discount rule takes two weeks.

This is an architectural problem, not a process problem. Business logic that changes weekly shouldn't live in code that ships quarterly.

LexQ separates the two. Rules live outside your application. You change them in a visual console or through this CLI. You prove every change with batch simulation against real execution data. You deploy without touching your codebase.

Every decision leaves a full audit trace.

Install

npm install -g @lexq/cli

Or run without installing:

npx @lexq/cli

Requires Node.js 18+.

Quick Start

# 1. Authenticate
lexq auth login
# Enter your API key (create one at console.lexq.io → Management → API Keys)

# 2. Verify
lexq auth whoami

# 3. Create a policy group
lexq groups create --json '{"name":"my-policy","priority":0}'

# 4. Create a draft version
lexq versions create --group-id <GROUP_ID> --json '{"commitMessage":"v1"}'

# 5. Add a rule
lexq rules create --group-id <GROUP_ID> --version-id <VERSION_ID> --json '{
  "name": "VIP Discount",
  "priority": 0,
  "condition": {
    "type": "SINGLE",
    "field": "customer_tier",
    "operator": "EQUALS",
    "value": "VIP",
    "valueType": "STRING"
  },
  "actions": [{
    "type": "DISCOUNT",
    "parameters": {"method":"PERCENTAGE","rate":10,"refVar":"payment_amount"}
  }]
}'

# 6. Test against your data before shipping
lexq analytics dry-run --version-id <VERSION_ID> --debug --mock \
  --json '{"facts":{"customer_tier":"VIP","payment_amount":100000}}'

# 7. Deploy
lexq deploy publish --group-id <GROUP_ID> --version-id <VERSION_ID> --memo "v1"
lexq deploy live --group-id <GROUP_ID> --version-id <VERSION_ID> --memo "Initial deploy"

For AI Agents — 63 MCP Tools

LexQ is designed to be AI-native. The entire policy engine API — all 63 tools — is exposed via Model Context Protocol. Claude, Cursor, and other MCP-compatible agents can create, simulate, and deploy rules autonomously, with human approval before production.

Claude.ai (Cloud — no install)

1. Settings → Connectors → Add Custom Integration
2. Enter: https://mcp.lexq.io
3. Sign in with your LexQ account and select an API key
4. Done — 63 tools available in every conversation

Remote (Streamable HTTP)

For any MCP client that supports remote servers:

{
  "mcpServers": {
    "lexq": {
      "url": "https://mcp.lexq.io"
    }
  }
}

OAuth 2.1 authentication is handled automatically by your client.

Local (stdio)

Run LexQ CLI as a local MCP server:

lexq serve --mcp

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "lexq": {
      "command": "npx",
      "args": [
        "-y",
        "@lexq/cli",
        "serve",
        "--mcp"
      ]
    }
  }
}

VS Code / Cursor

.vscode/mcp.json:

{
  "servers": {
    "lexq": {
      "command": "npx",
      "args": [
        "-y",
        "@lexq/cli",
        "serve",
        "--mcp"
      ]
    }
  }
}

Prerequisite: lexq auth login must have been run once to store an API key in ~/.lexq/config.json.

AI Agent Skills

LexQ CLI ships with AI Agent Skills — structured documentation agents read to understand how to use the tools, not just what they are.

skills/
├── lexq-shared/SKILL.md       Core concepts, auth, workflow
├── lexq-groups/SKILL.md       Policy groups, conflict resolution, A/B testing
├── lexq-rules/SKILL.md        Condition syntax, action types, mutex
├── lexq-simulation/SKILL.md   Dry run, batch simulation, compare
├── lexq-execution/SKILL.md    Execution history, stats, failure logs
└── lexq-recipes/SKILL.md      End-to-end recipes

.claude/CLAUDE.md              Claude Code project context
AGENTS.md                      Universal agent guide (Cursor, Windsurf, Gemini CLI, Cline)
CONTEXT.md                     Platform architecture & glossary

After installing @lexq/cli, agents can read skills from:

node_modules/@lexq/cli/skills/
node_modules/@lexq/cli/AGENTS.md
node_modules/@lexq/cli/CONTEXT.md

Commands

lexq auth                  login | logout | whoami
lexq status                API health check
lexq serve                 Run as MCP stdio server (--mcp)
lexq groups                list | get | create | update | delete
lexq groups ab-test        start | stop | adjust
lexq versions              list | get | create | update | delete | clone
lexq rules                 list | get | create | update | delete | reorder | toggle
lexq facts                 list | create | update | delete | action-metadata
lexq deploy                publish | live | rollback | undeploy | history | detail | overview | deployable | diff
lexq analytics             dry-run | dry-run-compare | requirements
lexq analytics simulation  start | status | list | cancel | export
lexq analytics dataset     upload | template
lexq history               list | get | stats
lexq integrations          list | get | save | delete | config-spec
lexq logs                  list | get | action | bulk-action
lexq webhook-subscriptions list | get | save | delete | test

Global Options

Flag	Description
--format <json|table>	Output format (default: json)
--api-key <key>	Override stored API key
--base-url <url>	Override API base URL
--dry-run	Preview the HTTP request without executing
--verbose	Show request/response details
--no-color	Disable colored output

Configuration

Config is stored at ~/.lexq/config.json:

{
  "apiKey": "YOUR_API_KEY",
  "baseUrl": "https://api.lexq.io/api/v1/partners",
  "format": "json"
}

Development

git clone https://github.com/lexq-io/lexq-cli.git
cd lexq-cli
pnpm install
pnpm build
pnpm start -- groups list

pnpm typecheck                  # Type check
pnpm lint                       # ESLint
bash tests/e2e.sh               # CLI E2E tests (requires API key)
bash tests/test-engine-api.sh   # Engine API integration tests

License

Apache-2.0