Lark Coding Agent Bridge

lark-coding-agent-bridge

Skill by ara.so — AI Agent Skills collection.

A lightweight bot that bridges Feishu/Lark messenger with your local Claude Code or Codex CLI. Send messages in Feishu and get streaming responses with tool calls updating in real-time cards. Each chat/topic maintains its own session with support for multiple workspaces, queueing, and file attachments.

What It Does

• Message forwarding: DM the bot or @mention in groups to talk to your local coding agent
• Streaming cards: Real-time updates of text replies and tool calls on a single Lark card
• Session continuity: Each chat, topic, or document comment thread maintains its own session
• Queue management: Messages sent quickly are batched; commands like /new, /cd, /stop interrupt current runs
• Multiple workspaces: Switch projects with /cd and save common directories with /ws
• Media support: Send images and files directly to the bot
• Access control: Private by default with granular user/group permissions

Prerequisites

• Node.js >= 20.12.0
• At least one local agent installed and authenticated:
  • Claude Code: claude (https://docs.anthropic.com/en/docs/claude-code/quickstart)
  • Codex CLI: codex (https://developers.openai.com/codex/cli)
• A Feishu/Lark PersonalAgent app (QR wizard creates one on first run)

Installation

# Global installation (recommended for background service)
npm i -g lark-channel-bridge

# Or with pnpm
pnpm add -g lark-channel-bridge

# Or run directly with npx (foreground only)
npx lark-channel-bridge run

First-Time Setup

# Start the QR wizard
lark-channel-bridge run

# With existing app ID
lark-channel-bridge run --app-id cli_xxx

# For Lark global apps
lark-channel-bridge run --app-id cli_xxx --tenant lark

# Specify agent type explicitly
lark-channel-bridge run --agent claude

# Set initial workspace
lark-channel-bridge run --workspace /path/to/project

The QR wizard:

1. Displays QR code in terminal
2. Scan with Feishu/Lark app
3. Pick/create a PersonalAgent app
4. Choose agent to initialize (claude or codex)
5. Config saved to ~/.lark-channel/config.json

Background Service Management

# Start background service (macOS: launchd, Linux: systemd, Windows: Task Scheduler)
lark-channel-bridge start

# Check status
lark-channel-bridge status

# Stop service
lark-channel-bridge stop

# Restart service
lark-channel-bridge restart

# Remove service registration
lark-channel-bridge unregister

Important: Install globally before using service commands. The daemon records the CLI path, and npx temp cache paths break when cleaned.

Multiple Profiles (Claude + Codex)

# Create separate profiles for different agents
lark-channel-bridge profile create claude --agent claude
lark-channel-bridge profile create codex --agent codex

# List all profiles
lark-channel-bridge profile list

# Switch active profile
lark-channel-bridge profile use claude

# Start specific profile
lark-channel-bridge start --profile claude
lark-channel-bridge start --profile codex

# Check specific profile status
lark-channel-bridge status --profile codex

# Remove profile (archives by default)
lark-channel-bridge profile remove codex

# Permanently delete profile
lark-channel-bridge profile remove codex --purge --yes

# Export profile (secrets redacted)
lark-channel-bridge profile export claude --output ./claude-profile.json

# Export with secrets
lark-channel-bridge profile export claude --include-secrets --yes

In-Chat Slash Commands

Session Management

/new              # Clear current session
/reset            # Alias for /new
/cd /path/to/dir  # Switch working directory and reset session
/resume           # Resume compatible history for same agent/directory/permissions
/timeout 30       # Set 30-minute idle timeout
/timeout off      # Disable timeout
/timeout default  # Restore default timeout
/stop             # Stop current run

Workspace Management

/ws list                    # List all named workspaces
/ws save myproject         # Save current directory as "myproject"
/ws use myproject          # Switch to "myproject" workspace
/ws remove myproject       # Delete "myproject" workspace

Access Control

/invite user @username      # Allow user to DM the bot
/invite admin @username     # Add access-control admin
/invite group              # Allow current group to use bot
/invite all group          # Allow all groups bot has joined
/remove user @username     # Remove user access
/remove admin @username    # Remove admin
/remove group              # Remove current group access

Diagnostics & Info

/status        # Show profile, agent, working directory, session state
/config        # Adjust preferences and view access panel
/help          # Display help card
/ps            # List local bridge processes
/exit <id|#>   # Stop a bridge process
/reconnect     # Force WebSocket reconnect
/doctor        # Run diagnostics (include description for context)

Configuration

Profile Structure

Config location: ~/.lark-channel/config.json

{
  "activeProfile": "default",
  "profiles": {
    "default": {
      "name": "default",
      "agent": "claude",
      "feishu": {
        "appId": "cli_xxx",
        "tenant": "feishu"
      },
      "workspaces": {
        "default": "/Users/me/.lark-channel-workspaces/claude/default",
        "named": {
          "myproject": "/Users/me/projects/myproject",
          "webapp": "/Users/me/work/webapp"
        }
      },
      "permissions": {
        "defaultAccess": "full",
        "maxAccess": "full"
      }
    }
  }
}

Permission Modes

Edit the profile's permissions field:

{
  "permissions": {
    "defaultAccess": "full",
    "maxAccess": "full"
  }
}

Mode mappings:

Working Directories

The bridge validates directories exist, are actual directories, and aren't overly broad (not /, home root, system dirs, temp roots).

// Profile field snippet - edit matching profile's workspaces
{
  "workspaces": {
    "default": "/Users/me/projects/default",
    "named": {
      "backend": "/Users/me/work/backend-api",
      "frontend": "/Users/me/work/web-client",
      "mobile": "/Users/me/work/mobile-app"
    }
  }
}

Switch in chat:

/cd /Users/me/work/new-project
/ws save new-project
/ws use backend

Process Management

# List all running bridge processes
lark-channel-bridge ps

# Kill specific process by ID or index
lark-channel-bridge kill 12345
lark-channel-bridge kill 1  # First in list

In Feishu chat:

/ps         # List processes
/exit 1     # Stop first process
/exit 12345 # Stop by PID

Data Directories

~/.lark-channel/
├── config.json                              # Root config with profiles
├── active-profile                           # Last selected profile
├── profiles/
│   └── <profile>/
│       ├── sessions.json                    # Session state
│       ├── sessions.json.catalog.json       # Agent-aware session catalog
│       ├── workspaces.json                  # Workspace bindings
│       ├── secrets.enc                      # Encrypted secrets
│       ├── media/                           # Attachment cache
│       └── logs/
│           ├── daemon/                      # Background service logs
│           └── <timestamp>/                 # Structured run logs
└── registry/
    ├── processes.json                       # Process registry
    └── locks/                               # Profile and app locks

Environment Variables

# Move all local bridge state
export LARK_CHANNEL_HOME=/custom/path/to/state

# Override log retention (default: 7 days)
export LARK_CHANNEL_LOG_DAYS=30

Code Examples

Starting Multiple Agent Profiles

#!/bin/bash
# setup-dual-agents.sh - Run both Claude and Codex bridges

# Create profiles if they don't exist
lark-channel-bridge profile create claude --agent claude --workspace ~/projects
lark-channel-bridge profile create codex --agent codex --workspace ~/projects

# Start both services
lark-channel-bridge start --profile claude
lark-channel-bridge start --profile codex

# Verify both are running
lark-channel-bridge status --profile claude
lark-channel-bridge status --profile codex

Scripted Deployment

#!/bin/bash
# deploy-lark-bridge.sh - Automated deployment

set -e

PROFILE_NAME="${1:-production}"
AGENT_TYPE="${2:-claude}"
WORKSPACE_PATH="${3:-$HOME/workspace}"
APP_ID="${LARK_APP_ID}"  # From environment
APP_SECRET="${LARK_APP_SECRET}"  # From environment

if [ -z "$APP_ID" ] || [ -z "$APP_SECRET" ]; then
  echo "Error: Set LARK_APP_ID and LARK_APP_SECRET"
  exit 1
fi

# Create profile
lark-channel-bridge profile create "$PROFILE_NAME" \
  --agent "$AGENT_TYPE" \
  --workspace "$WORKSPACE_PATH"

# Use the new profile
lark-channel-bridge profile use "$PROFILE_NAME"

# Start with app credentials (will prompt for secret if interactive)
lark-channel-bridge start --profile "$PROFILE_NAME" --app-id "$APP_ID"

echo "Bridge deployed as profile: $PROFILE_NAME"

Health Check Script

#!/bin/bash
# healthcheck.sh - Monitor bridge health

PROFILE="${1:-default}"

# Check if service is running
if ! lark-channel-bridge status --profile "$PROFILE" | grep -q "running"; then
  echo "Bridge not running, attempting restart..."
  lark-channel-bridge restart --profile "$PROFILE"
  
  # Wait and verify
  sleep 5
  if lark-channel-bridge status --profile "$PROFILE" | grep -q "running"; then
    echo "Bridge restarted successfully"
    exit 0
  else
    echo "Bridge failed to restart"
    exit 1
  fi
fi

echo "Bridge healthy"
exit 0

Programmatic Configuration Update

// update-config.ts - Modify profile settings programmatically
import { readFileSync, writeFileSync } from 'fs';
import { homedir } from 'os';
import { join } from 'path';

interface Profile {
  name: string;
  agent: 'claude' | 'codex';
  permissions?: {
    defaultAccess: 'full' | 'workspace' | 'read-only';
    maxAccess: 'full' | 'workspace' | 'read-only';
  };
  workspaces?: {
    default: string;
    named?: Record<string, string>;
  };
}

interface Config {
  activeProfile: string;
  profiles: Record<string, Profile>;
}

const configPath = join(homedir(), '.lark-channel', 'config.json');

function updateProfilePermissions(
  profileName: string,
  mode: 'full' | 'workspace' | 'read-only'
): void {
  const config: Config = JSON.parse(readFileSync(configPath, 'utf-8'));
  
  if (!config.profiles[profileName]) {
    throw new Error(`Profile ${profileName} not found`);
  }
  
  config.profiles[profileName].permissions = {
    defaultAccess: mode,
    maxAccess: mode,
  };
  
  writeFileSync(configPath, JSON.stringify(config, null, 2));
  console.log(`Updated ${profileName} to ${mode} mode`);
}

function addWorkspace(
  profileName: string,
  name: string,
  path: string
): void {
  const config: Config = JSON.parse(readFileSync(configPath, 'utf-8'));
  
  if (!config.profiles[profileName]) {
    throw new Error(`Profile ${profileName} not found`);
  }
  
  if (!config.profiles[profileName].workspaces) {
    config.profiles[profileName].workspaces = {
      default: path,
      named: {},
    };
  }
  
  if (!config.profiles[profileName].workspaces!.named) {
    config.profiles[profileName].workspaces!.named = {};
  }
  
  config.profiles[profileName].workspaces!.named![name] = path;
  
  writeFileSync(configPath, JSON.stringify(config, null, 2));
  console.log(`Added workspace ${name}: ${path} to ${profileName}`);
}

// Example usage
updateProfilePermissions('production', 'workspace');
addWorkspace('production', 'api', '/home/user/projects/api');

Common Patterns

Multi-Workspace Development

# Start with default workspace
lark-channel-bridge run

# In Feishu, save current projects
/cd ~/work/backend
/ws save backend

/cd ~/work/frontend
/ws save frontend

/cd ~/work/mobile
/ws save mobile

# Switch between them quickly
/ws use backend
# ... do backend work ...

/ws use frontend
# ... do frontend work ...

# View all workspaces
/ws list

Team Setup with Access Control

# Creator sets up bot
lark-channel-bridge run --app-id cli_xxx

# Add team leads as admins (they can manage access)
/invite admin @tech-lead
/invite admin @product-lead

# Allow specific developers DM access
/invite user @developer1
/invite user @developer2

# Allow bot in team channels
# (In each channel, as creator or admin)
/invite group

# Or allow all groups at once
/invite all group

Locked-Down Production Setup

# Create production profile with restricted permissions
lark-channel-bridge profile create production \
  --agent claude \
  --workspace /opt/production/workspace

# Edit config to lock down permissions
cat > /tmp/update-perms.json << 'EOF'
{
  "permissions": {
    "defaultAccess": "read-only",
    "maxAccess": "workspace"
  }
}
EOF

# Merge into config (manual edit or script)
# Then start with read-only mode
lark-channel-bridge start --profile production

In chat, users can still ask questions and get code suggestions, but the agent won't execute dangerous operations or write files outside the workspace.

Session Recovery After Restart

# After bridge restart, sessions persist automatically
# Resume last session in current chat
/resume

# Or start fresh
/new

# Check current state
/status

Troubleshooting

Bridge Won't Start

# Check if another instance is running
lark-channel-bridge ps

# Kill conflicting processes
lark-channel-bridge kill 1

# Check service status
lark-channel-bridge status

# View daemon logs
tail -f ~/.lark-channel/profiles/default/logs/daemon/*.log

# Verify Node.js version
node --version  # Must be >= 20.12.0

# Reinstall globally
npm uninstall -g lark-channel-bridge
npm i -g lark-channel-bridge

Bot Not Responding in Feishu

# In chat, check connection
/status
/reconnect

# Verify app credentials
cat ~/.lark-channel/config.json | grep appId

# Run diagnostics
/doctor Cannot receive messages in group chat

# Check if group is allowed
/config  # View access panel
/invite group  # Add current group

Wrong Agent Type

# Stop service first
lark-channel-bridge stop --profile wrong-agent

# Remove profile
lark-channel-bridge profile remove wrong-agent

# Recreate with correct agent
lark-channel-bridge profile create correct-agent --agent codex

# Start new profile
lark-channel-bridge start --profile correct-agent

Session Not Resuming

# Sessions are agent + workspace + permission mode specific
# Check current state
/status

# If workspace or permissions changed, /resume won't find history
# Either:
# 1. Switch back to original workspace
/ws use original-project

# 2. Or start fresh
/new

Permission Denied Errors

# Check current permission mode
/status

# If agent complains about restricted access:
# 1. Increase permission level (edit config)
{
  "permissions": {
    "defaultAccess": "workspace",  # or "full"
    "maxAccess": "workspace"       # or "full"
  }
}

# 2. Restart bridge
lark-channel-bridge restart

# 3. Start new session with new permissions
/new

Working Directory Validation Failed

# Common causes:
# - Directory doesn't exist
# - Path is too broad (/, ~, /tmp, /usr, etc.)
# - Not a directory (is a file)

# Check current directory
/status

# Fix:
mkdir -p /path/to/valid/workspace
/cd /path/to/valid/workspace

# Or use an existing project
/cd ~/projects/my-app

Media Files Not Working

# Media downloaded to profile-specific cache
~/.lark-channel/profiles/<profile>/media/

# If files aren't reaching agent:
# 1. Check bridge logs
tail -f ~/.lark-channel/profiles/default/logs/<latest>/bridge.log

# 2. Verify file permissions
ls -la ~/.lark-channel/profiles/default/media/

# 3. Ensure working directory allows file access
/status  # Check permission mode

Process Won't Stop

# Service won't stop cleanly
lark-channel-bridge stop  # May hang

# Force kill
lark-channel-bridge ps
lark-channel-bridge kill 1  # Or specific PID

# Unregister and re-register service
lark-channel-bridge unregister
lark-channel-bridge start

Log Retention Issues

# Logs filling disk
du -sh ~/.lark-channel/profiles/*/logs/

# Set retention period
export LARK_CHANNEL_LOG_DAYS=3

# Restart bridge
lark-channel-bridge restart

# Or manually clean old logs
find ~/.lark-channel/profiles/*/logs -type f -mtime +7 -delete

Multiple Profiles Conflict

# Check all running profiles
lark-channel-bridge ps

# Ensure each profile uses unique app ID
cat ~/.lark-channel/config.json | jq '.profiles[].feishu.appId'

# If same app ID in multiple profiles, one must be removed
lark-channel-bridge profile remove duplicate

This skill enables AI coding agents to help developers set up, configure, and troubleshoot the Lark Channel Bridge for seamless chat-based coding assistance.