mcp2cli

CLI bridge that wraps MCP (Model Context Protocol) servers as bash-invokable commands. Instead of loading all MCP tool definitions into an LLM's system prompt (~13K+ tokens permanently), agents invoke tools via bash at zero context cost.

Inspired by Google Workspace CLI, which wrapped Google's complex APIs into simple CLI commands -- all the functionality, none of the hassle. mcp2cli does the same for MCP servers.

Quick Start

# Install
git clone <repo-url>
cd mcp2cli
bun install
bun run build        # produces dist/mcp2cli

# Bootstrap from existing Claude config
mcp2cli bootstrap    # reads ~/.claude.json mcpServers -> ~/.config/mcp2cli/services.json

# Use it
mcp2cli services                                    # list available services
mcp2cli n8n --help                                   # list tools for a service
mcp2cli n8n n8n_list_workflows --params '{}'         # invoke a tool
mcp2cli schema n8n.n8n_list_workflows                # inspect tool schema

For development without building:

bun run dev -- services
bun run dev -- n8n n8n_list_workflows --params '{}'

Installation

Prerequisites: Bun v1.0+

git clone <repo-url>
cd mcp2cli
bun install
bun run build

The compiled binary lands at dist/mcp2cli. Add it to your PATH or symlink it.

Configuration

Service Registry

mcp2cli discovers MCP servers from ~/.config/mcp2cli/services.json:

{
  "services": {
    "n8n": {
      "description": "n8n workflow automation",
      "backend": "stdio",
      "command": "npx",
      "args": ["-y", "@anthropic-ai/n8n-mcp"],
      "env": {
        "N8N_BASE_URL": "https://n8n.example.com",
        "N8N_API_KEY": "your-api-key"
      }
    },
    "homekit": {
      "description": "HomeKit smart home control",
      "backend": "stdio",
      "command": "node",
      "args": ["/path/to/homekit-mcp/dist/index.js"],
      "env": {}
    }
  }
}

Each service entry mirrors the Claude Desktop mcpServers format -- same command, args, and env fields.

Bootstrap from Claude Config

If you already have MCP servers configured in ~/.claude.json:

mcp2cli bootstrap

This reads your mcpServers entries and generates services.json automatically.

Commands

List Services

mcp2cli services

List Tools for a Service

mcp2cli <service> --help

Invoke a Tool

mcp2cli <service> <tool> --params '<json>'

The --params value must be valid JSON matching the tool's input schema.

Inspect Tool Schema

mcp2cli schema <service>.<tool>

Returns the JSON Schema for the tool's input parameters -- useful for discovering required fields.

Dry Run

mcp2cli <service> <tool> --params '{"query": "test"}' --dry-run

Validates input and shows what would be sent without executing the tool call.

Field Filtering

mcp2cli <service> <tool> --params '{}' --fields "id,name,status"

Extracts only the specified fields from the response -- reduces output noise for scripting.

Generate Skill Files

mcp2cli generate-skills <service>

Generates PAI skill files from MCP tool schemas, making tools discoverable by AI agents.

Daemon Management

mcp2cli daemon status    # check if daemon is running, connection pool stats
mcp2cli daemon stop      # graceful shutdown

Output Format

All responses are structured JSON on stdout. Logs go to stderr.

// Success
{ "success": true, "result": { "workflows": [...] } }

// Error
{ "error": true, "code": "TOOL_ERROR", "message": "Workflow not found", "reason": "..." }

This makes mcp2cli composable with jq, pipes, and scripting:

# Get workflow names
mcp2cli n8n n8n_list_workflows --params '{}' | jq '.result.workflows[].name'

# Check for errors
mcp2cli n8n n8n_get_workflow --params '{"id": "123"}' | jq 'if .error then .message else .result end'

Exit Codes

Code	Meaning
0	Success
1	Validation error (bad input, schema mismatch)
2	Auth error (missing credentials, permission denied)
3	Tool error (MCP tool returned an error)
4	Connection error (daemon unreachable, transport failure)
5	Internal error

Use exit codes for scripting:

mcp2cli n8n n8n_get_workflow --params '{"id": "123"}' 2>/dev/null
if [ $? -eq 4 ]; then
  echo "Connection failed -- is the MCP server configured?"
fi

Environment Variables

Variable	Default	Description
`MCP2CLI_LOG_LEVEL`	`silent`	Log verbosity: `silent`, `error`, `warn`, `info`, `debug`
`MCP2CLI_IDLE_TIMEOUT`	`60`	Daemon idle timeout in seconds
`MCP2CLI_TOOL_TIMEOUT`	`30000`	Tool call timeout in milliseconds
`MCP2CLI_POOL_MAX`	`50`	Max concurrent MCP connections in the pool
`MCP2CLI_LOG_DIR`	`~/.cache/mcp2cli/logs`	Directory for stderr capture logs
`MCP2CLI_NO_DAEMON`	(unset)	If set, bypass the daemon and connect directly
`MCP2CLI_DEBUG`	(unset)	If `1`, print discarded stdout lines from MCP servers

Example:

MCP2CLI_LOG_LEVEL=debug mcp2cli n8n n8n_list_workflows --params '{}'
MCP2CLI_NO_DAEMON=1 mcp2cli n8n n8n_list_workflows --params '{}'

Architecture

CLI Entry (src/cli/index.ts)
  |-- Command Dispatch (services, schema, bootstrap, generate-skills, daemon)
  |-- Tool Call Handler -> Daemon Client (Unix socket)
  |                          \-- Daemon Server (src/daemon/server.ts)
  |                                |-- Connection Pool (src/daemon/pool.ts)
  |                                |     \-- MCP Transport (src/connection/transport.ts)
  |                                |-- Idle Timer (src/daemon/idle.ts)
  |                                \-- Health Endpoint (/health with memory stats)
  |-- Input Validation (src/validation/) -- 48 adversarial patterns
  |-- Schema Introspection (src/schema/)
  |-- Skill Generation (src/generation/)
  \-- Structured Logger (src/logger/) -- JSON on stderr

Key Design Decisions

Persistent daemon. MCP servers have a 2-5 second startup cost per connection. The daemon keeps connections alive in a pool, so subsequent calls return in milliseconds instead of seconds. The daemon auto-exits after the idle timeout (default 60s).

Connection pool with health checks. Connections are validated before use and recycled on failure. The pool enforces a max size to prevent resource exhaustion.

Structured JSON everywhere. stdout is always parseable JSON -- no mixed text output. Logs (when enabled) go to stderr as structured JSON lines. This makes mcp2cli reliable for scripting and piping.

Semantic exit codes. Different failure modes get different exit codes so callers can branch on the type of error without parsing output.

Input validation. All tool parameters are validated against the MCP schema before the call is dispatched. The validation layer handles 48 adversarial patterns (injection attempts, type coercion, overflow) to fail fast with clear errors.

Agent Integration

mcp2cli is designed to be called from AI agents via bash tool use. A typical agent workflow:

# Agent discovers available tools
mcp2cli n8n --help

# Agent reads the schema to understand parameters
mcp2cli schema n8n.n8n_get_workflow

# Agent invokes the tool
mcp2cli n8n n8n_get_workflow --params '{"id": "abc123"}'

This pattern keeps MCP tool definitions out of the agent's system prompt entirely. The agent only pays context cost when it actually needs to call a tool, and even then only for the specific tool's schema -- not all tools from all servers.

Multi-User Authentication

mcp2cli supports multi-user RBAC via ~/.config/mcp2cli/tokens.json. Each user or agent gets a bearer token with a role.

tokens.json

{
  "tokens": [
    {
      "id": "rico",
      "token": "your-admin-token-here",
      "role": "admin",
      "description": "Full admin access",
      "username": "rico",
      "password": "your-web-ui-password"
    },
    {
      "id": "skippy",
      "token": "your-agent-token-here",
      "role": "agent",
      "description": "AI agent - tools + read, no config mutations"
    },
    {
      "id": "viewer01",
      "token": "your-viewer-token-here",
      "role": "viewer",
      "description": "Read-only access"
    }
  ]
}

Generate secure tokens: openssl rand -base64 32

RBAC Roles

Permission	viewer	agent	admin
List services, status	yes	yes	yes
Call tools, list tools, schema	no	yes	yes
Read credentials	no	yes	yes
Add/update/remove services	no	no	yes
Write credentials, manage groups	no	no	yes
Reload, import, shutdown	no	no	yes

The username/password fields enable web UI login at the daemon's root URL. Token-based auth (Bearer header) works for all API and CLI access.

Fallback Behavior

No tokens.json, no env token: Auth disabled, all requests treated as admin (backward compatible)
MCP2CLI_AUTH_TOKEN env var only: Legacy single-token mode, treated as admin
tokens.json exists: Full multi-user RBAC

Per-Identity Credential Management

Different users and agents can have their own API keys for backend services. When rico calls open-brain, he uses his key. When skippy calls it, the agents' shared key is used.

credentials.json

Create ~/.config/mcp2cli/credentials.json:

{
  "groups": {
    "ai_agents": ["skippy", "bilby", "nagatha", "claude"]
  },
  "credentials": {
    "rico": {
      "open-brain": { "headers": { "Authorization": "Bearer ricos-ob-key" } }
    },
    "ai_agents": {
      "open-brain": { "headers": { "Authorization": "Bearer agents-shared-ob-key" } },
      "n8n": { "env": { "N8N_API_KEY": "agents-n8n-key" } }
    }
  },
  "defaults": {
    "proxmox": { "headers": { "Authorization": "PVEAPIToken=shared-token" } }
  }
}

Resolution Chain

When a tool call comes in, credentials are resolved in priority order:

User-specific -- credentials[userId][service]
Group -- first matching group the user belongs to
Defaults -- defaults[service]
services.json -- whatever's baked into the service config (backward compatible)

For http/websocket services, credential headers are merged into the connection. For stdio services, credential env vars are merged into the process environment.

Credential CLI

# Set credentials for an identity on a service
mcp2cli credentials set rico open-brain --header "Authorization: Bearer my-key"

# Set env-based credentials (for stdio services)
mcp2cli credentials set rico n8n --env "N8N_API_KEY=my-n8n-key"

# Set a default credential (used when no user/group match)
mcp2cli credentials set-default proxmox --header "Authorization: PVEAPIToken=shared"

# List all credentials (values are redacted)
mcp2cli credentials list

# Show effective credential source for a user
mcp2cli credentials resolve skippy open-brain
# → {"exists": true, "source": "group"}

# Group management
mcp2cli credentials group add ai_agents skippy bilby nagatha
mcp2cli credentials group add-members ai_agents claude
mcp2cli credentials group remove-members ai_agents bilby
mcp2cli credentials group list

# Remove credentials
mcp2cli credentials remove rico open-brain
mcp2cli credentials remove-default proxmox
mcp2cli credentials group remove ai_agents

# Reload from disk after manual edits
mcp2cli credentials reload

Open Brain Example

Open Brain (OBv2) is an HTTP MCP service. With credential management, each user gets their own API key:

services.json -- base config (no credentials, just the endpoint):

{
  "services": {
    "open-brain": {
      "backend": "http",
      "url": "http://10.71.20.49:3100/mcp"
    }
  }
}

credentials.json -- per-identity keys:

{
  "groups": {
    "ai_agents": ["skippy", "bilby", "claude"]
  },
  "credentials": {
    "rico": {
      "open-brain": { "headers": { "Authorization": "Bearer ricos-ob-api-key" } }
    },
    "ai_agents": {
      "open-brain": { "headers": { "Authorization": "Bearer agents-shared-ob-key" } }
    }
  }
}

Now when rico calls mcp2cli open-brain search_all --params '{"query": "kubernetes"}', his personal key is injected. When skippy calls the same tool, the agents' shared key is used. Each gets their own connection in the pool.

Security

Redacted list output -- GET /api/credentials returns Bear*** not full values
IDOR protection -- agents can only resolve their own credentials, admin required for others
File permissions -- credentials.json is written with 0600 (owner read/write only)
Input validation -- header values reject CRLF injection, dangerous headers (Host, Transfer-Encoding) and env vars (PATH, LD_PRELOAD, NODE_OPTIONS) are blocked
Atomic writes -- temp file + rename prevents partial writes on crash
Pool invalidation -- changing credentials evicts stale connections automatically

Advanced Features

Schema Caching

Schemas are cached locally to avoid re-fetching on every invocation. Cached schemas live at ~/.cache/mcp2cli/schemas/ with a 24-hour TTL. Cache drift is detected via SHA-256 hashing -- if the upstream schema changes, the cache is automatically invalidated.

# Check cache status (age, TTL, drift)
mcp2cli cache status

# Clear all cached schemas
mcp2cli cache clear

# Clear cache for a specific service
mcp2cli cache clear n8n

# Bypass cache for a single schema lookup
mcp2cli schema n8n.n8n_list_workflows --fresh

Override the cache directory with MCP2CLI_CACHE_DIR.

Access Control

Restrict which tools are exposed per service using allowTools and blockTools in services.json. Both accept glob patterns.

{
  "services": {
    "n8n": {
      "description": "n8n workflow automation",
      "backend": "stdio",
      "command": "npx",
      "args": ["-y", "@anthropic/n8n-mcp"],
      "allowTools": ["n8n_list_*", "n8n_get_*"],
      "blockTools": ["n8n_delete_*"]
    }
  }
}

When both are present, allowTools is evaluated first (whitelist), then blockTools removes matches from the allowed set.

Cross-Service Tool Search

Search for tools across all services using cached schemas:

# Find all tools matching a pattern
mcp2cli grep "workflow"

# Regex patterns work
mcp2cli grep "delete|remove"

This searches cached schemas only -- no MCP connections are made.

WebSocket Transport

Connect to MCP servers over WebSocket. Supports optional stdio fallback and access control, same as HTTP.

{
  "services": {
    "remote-mcp": {
      "description": "Remote MCP server via WebSocket",
      "backend": "websocket",
      "url": "ws://mcp-gateway.local:3000/mcp",
      "fallback": {
        "command": "npx",
        "args": ["-y", "@anthropic/n8n-mcp"]
      }
    }
  }
}

WebSocket services benefit from the same circuit breaker and fallback behavior as HTTP services.

Batch Tool Calls

Execute multiple tool calls in a single invocation by piping NDJSON to mcp2cli batch. Each line is a JSON object with service, tool, and params fields:

# Sequential execution (default)
cat <<EOF | mcp2cli batch
{"service": "n8n", "tool": "n8n_list_workflows", "params": {}}
{"service": "n8n", "tool": "n8n_get_workflow", "params": {"id": "1"}}
EOF

# Parallel execution
cat <<EOF | mcp2cli batch --parallel
{"service": "n8n", "tool": "n8n_list_workflows", "params": {}}
{"service": "n8n", "tool": "n8n_get_workflow", "params": {"id": "1"}}
EOF

Output is NDJSON -- one result per line with the original service/tool for correlation:

{"service":"n8n","tool":"n8n_list_workflows","success":true,"result":{...}}
{"service":"n8n","tool":"n8n_get_workflow","success":true,"result":{...}}

Errors for individual calls are reported inline without aborting the batch.

Gateway Resilience

HTTP/SSE services can define a fallback stdio config. If the remote gateway is unreachable, mcp2cli transparently falls back to a local MCP server process.

{
  "services": {
    "n8n": {
      "description": "n8n via HTTP gateway with stdio fallback",
      "backend": "http",
      "url": "http://mcp-gateway:3000/n8n",
      "fallback": {
        "command": "npx",
        "args": ["-y", "@anthropic/n8n-mcp"]
      }
    }
  }
}

A circuit breaker protects against repeated failures: after 5 consecutive failures the circuit opens and routes directly to fallback for 60 seconds before re-probing the primary. Circuit state is persisted to ~/.cache/mcp2cli/circuit-breaker/ so it survives process restarts.

Output Formats

Control output format with the --format flag:

mcp2cli n8n n8n_list_workflows --params '{}' --format table
mcp2cli n8n n8n_list_workflows --params '{}' --format yaml
mcp2cli n8n n8n_list_workflows --params '{}' --format csv
mcp2cli n8n n8n_list_workflows --params '{}' --format ndjson

Format	Description
`json`	Default. Structured JSON (unchanged from v1.0)
`table`	Aligned columns -- human-readable terminal output
`yaml`	YAML output
`csv`	RFC 4180 CSV -- pipe to spreadsheets or `csvtool`
`ndjson`	One JSON object per line -- for streaming pipelines

Error responses are always JSON regardless of the --format flag.

Skill Auto-Regeneration

Generated skill files can be previewed and kept in sync with upstream schema changes:

# Preview what would change without writing
mcp2cli generate-skills --diff n8n

# Regenerate (preserves manual sections)
mcp2cli generate-skills n8n

Manual edits inside MANUAL:START / MANUAL:END markers are preserved across regeneration. When schema drift is detected (via the caching layer), skill regeneration can be triggered automatically.

Additional Environment Variables

Variable	Default	Description
`MCP2CLI_CACHE_DIR`	`~/.cache/mcp2cli`	Base directory for schema cache and circuit breaker state
`MCP2CLI_TOKENS_FILE`	`~/.config/mcp2cli/tokens.json`	Path to multi-user token config
`MCP2CLI_CREDENTIALS_FILE`	`~/.config/mcp2cli/credentials.json`	Path to per-identity credential mappings

Network Deployment

mcp2cli can run as a centralized TCP daemon, allowing multiple machines to share a single set of MCP server connections. Install and configure MCP backends once on a server, then connect from any machine using the CLI client or the bash wrapper (curl + jq only -- no Bun required).

Quick Start (TCP Mode)

Server -- start the daemon with TCP binding:

export MCP2CLI_LISTEN_HOST=0.0.0.0
export MCP2CLI_LISTEN_PORT=9500
export MCP2CLI_AUTH_TOKEN=$(openssl rand -hex 32)
MCP2CLI_DAEMON=1 mcp2cli

Client -- point any machine at the remote daemon:

export MCP2CLI_REMOTE_URL=http://mcp-server.local:9500
export MCP2CLI_AUTH_TOKEN=<same-token-as-server>
mcp2cli n8n n8n_list_workflows --params '{}'

When MCP2CLI_REMOTE_URL is set, the CLI skips local daemon startup entirely and sends requests directly over HTTP.

Network Environment Variables

In addition to the base environment variables, network mode adds:

Variable	Default	Description
`MCP2CLI_LISTEN_HOST`	(unset)	Bind address for TCP mode. Setting this enables TCP instead of Unix socket. Use `0.0.0.0` to listen on all interfaces
`MCP2CLI_LISTEN_PORT`	`9500`	TCP port when `MCP2CLI_LISTEN_HOST` is set
`MCP2CLI_AUTH_TOKEN`	(unset)	Bearer token for TCP authentication. Required for production deployments
`MCP2CLI_REMOTE_URL`	(unset)	URL of remote mcp2cli daemon (e.g. `http://mcp-server:9500`). Enables remote client mode
`MCP2CLI_CONFIG`	`~/.config/mcp2cli/services.json`	Path to service definitions (useful for server-side config in `/etc/mcp2cli/`)
`MCP2CLI_TOKENS_FILE`	`~/.config/mcp2cli/tokens.json`	Path to multi-user token/RBAC config
`MCP2CLI_CREDENTIALS_FILE`	`~/.config/mcp2cli/credentials.json`	Path to per-identity credential mappings

Authentication

The daemon supports two auth modes (see Multi-User Authentication above):

Multi-user RBAC via tokens.json -- each user/agent gets their own token and role
Legacy single-token via MCP2CLI_AUTH_TOKEN env var -- treated as admin

All token comparisons use timing-safe equality to prevent timing attacks.

Auth-exempt paths -- these skip authentication so load balancers and monitoring can probe without credentials:

GET /health -- health check with uptime, memory, and pool status
GET /metrics -- Prometheus metrics endpoint

Prometheus Metrics

The daemon exposes metrics at GET /metrics in Prometheus text exposition format. Key metrics:

Metric	Type	Description
`mcp2cli_requests_total`	counter	Total requests by `{service, tool}`
`mcp2cli_requests_errors_total`	counter	Failed requests by `{service, tool}`
`mcp2cli_request_duration_ms`	histogram	Request latency with buckets (10ms - 30s)
`mcp2cli_requests_active`	gauge	Currently in-flight requests
`mcp2cli_pool_connections_active`	gauge	Current connection pool size
`mcp2cli_pool_services`	gauge	Connected services (`{service}` label)
`mcp2cli_connection_events_total`	counter	Connect/disconnect/health-check-failure by `{service}`
`mcp2cli_auth_failures_total`	counter	Total authentication failures
`mcp2cli_process_uptime_seconds`	gauge	Daemon uptime
`mcp2cli_process_memory_rss_bytes`	gauge	Resident set size

Add to your Prometheus config:

scrape_configs:
  - job_name: mcp2cli
    static_configs:
      - targets: ['mcp-server.local:9500']

Bash Wrapper (curl-only clients)

For machines that only have curl and jq (no Bun runtime), use the bash wrapper:

# Install the wrapper
cp scripts/mcp2cli-remote /usr/local/bin/
chmod +x /usr/local/bin/mcp2cli-remote

# Configure
export MCP2CLI_REMOTE_URL=http://mcp-server.local:9500
export MCP2CLI_AUTH_TOKEN=<token>

# Use it like the full CLI
mcp2cli-remote n8n n8n_list_workflows '{}'

LXC Deployment

The deploy/ directory contains everything needed to run mcp2cli as a systemd service in an LXC container (or any Linux host):

File	Purpose
`deploy/mcp2cli.service`	systemd unit file (hardened with `NoNewPrivileges`, `ProtectSystem=strict`)
`deploy/env.example`	Environment file template -- copy to `/etc/mcp2cli/env`
`deploy/services-server.json`	Example server-side service config

Setup:

# Copy files into place
cp deploy/mcp2cli.service /etc/systemd/system/
mkdir -p /etc/mcp2cli
cp deploy/env.example /etc/mcp2cli/env
cp deploy/services-server.json /etc/mcp2cli/services.json

# Edit config
vim /etc/mcp2cli/env           # set MCP2CLI_AUTH_TOKEN
vim /etc/mcp2cli/services.json  # configure your MCP backends

# Enable and start
useradd --system --no-create-home mcp2cli
systemctl daemon-reload
systemctl enable --now mcp2cli

curl Examples

SERVER=http://mcp-server.local:9500
TOKEN=your-token-here

# Health check (no auth required)
curl -s $SERVER/health | jq .

# Prometheus metrics (no auth required)
curl -s $SERVER/metrics

# List tools for a service
curl -s -X POST $SERVER/list-tools \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"service": "n8n"}' | jq .

# Invoke a tool
curl -s -X POST $SERVER/call \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"service": "n8n", "tool": "n8n_list_workflows", "params": {}}' | jq .

# Get a tool schema
curl -s -X POST $SERVER/schema \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"service": "n8n", "tool": "n8n_list_workflows"}' | jq .

Development

bun run dev -- <args>     # run without building
bun test                  # run test suite
bun run build             # compile to dist/mcp2cli

License

MIT

Name		Name	Last commit message	Last commit date
Latest commit History 25 Commits
.github/workflows		.github/workflows
deploy		deploy
examples		examples
scripts		scripts
src		src
tests		tests
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
VERSION		VERSION
bun.lock		bun.lock
package.json		package.json
tsconfig.json		tsconfig.json

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mcp2cli

Quick Start

Installation

Configuration

Service Registry

Bootstrap from Claude Config

Commands

List Services

List Tools for a Service

Invoke a Tool

Inspect Tool Schema

Dry Run

Field Filtering

Generate Skill Files

Daemon Management

Output Format

Exit Codes

Environment Variables

Architecture

Key Design Decisions

Agent Integration

Multi-User Authentication

tokens.json

RBAC Roles

Fallback Behavior

Per-Identity Credential Management

credentials.json

Resolution Chain

Credential CLI

Open Brain Example

Security

Advanced Features

Schema Caching

Access Control

Cross-Service Tool Search

WebSocket Transport

Batch Tool Calls

Gateway Resilience

Output Formats

Skill Auto-Regeneration

Additional Environment Variables

Network Deployment

Quick Start (TCP Mode)

Network Environment Variables

Authentication

Prometheus Metrics

Bash Wrapper (curl-only clients)

LXC Deployment

curl Examples

Development

License

About

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