Jenkins Slack

MCP server to trigger Jenkins builds from any IDE with Slack DM notifications. Auto-discovers all jobs on login — no manual configuration.

Install

npm install -g jenkins-slack-mcp

Register in your IDE

Amazon Q

~/.aws/amazonq/mcp.json:

{
  "mcpServers": {
    "jenkins-slack": {
      "command": "jenkins-slack-mcp",
      "args": [],
      "disabled": false
    }
  }
}

VS Code

.vscode/mcp.json:

{
  "mcpServers": {
    "jenkins-slack": { "command": "jenkins-slack-mcp" }
  }
}

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (macOS):

{
  "mcpServers": {
    "jenkins-slack": { "command": "jenkins-slack-mcp" }
  }
}

Cursor

.cursor/mcp.json:

{
  "mcpServers": {
    "jenkins-slack": { "command": "jenkins-slack-mcp" }
  }
}

Without global install

{
  "mcpServers": {
    "jenkins-slack": {
      "command": "npx",
      "args": ["-y", "jenkins-slack-mcp"]
    }
  }
}

---

Flow of Work

┌─────────────────────────────────────────────────────────┐
│  1. login_jenkins (baseUrl only)                        │
│     → Opens browser to Jenkins token page               │
│     → User copies API token + build trigger token       │
│                                                         │
│  2. login_jenkins (all params)                          │
│     → Validates credentials                             │
│     → Auto-discovers ALL jobs from Jenkins              │
│     → Stores encrypted at ~/.jenkins-slack-mcp/         │
│                                                         │
│  3. list_jobs / list_jobs filter="tms"                  │
│     → Shows jobs in table with status (✅ ❌ ⏸️)        │
│                                                         │
│  4. job_details jobName="my-job"                        │
│     → Shows all parameters (name, type, default,        │
│       choices) in table format                          │
│                                                         │
│  5. trigger_build jobName="my-job" params={...}         │
│     → Triggers build with params                        │
│     → Sends Slack DM to you (if configured)             │
│     → Posts to channel (if notifyChannel provided)      │
└─────────────────────────────────────────────────────────┘

---

Usage

Step 1: Login to Jenkins

First time — just provide the URL, browser opens automatically:

login_jenkins baseUrl="https://jenkins.example.com"

→ Browser opens Jenkins → Copy your API token and build trigger token.

Then login with full credentials:

login_jenkins:
  baseUrl: https://jenkins.example.com
  user: your_username
  apiToken: your_api_token
  buildToken: your_build_trigger_token

→ All jobs auto-discovered!

Step 2: Browse Jobs

list_jobs                    # all jobs
list_jobs filter="tms"       # filter by name

Output:

#	Job Name	Status
1	build-main	✅ Success
2	lib-packages	✅ Success
3	job-constant	✅ Success

Step 3: Check Parameters

job_details jobName="tms-docker-build-new"

Output:

Parameter	Type	Default	Choices	Description
BRANCH	String	main	-	Branch to build

Step 4: Trigger Build

trigger_build jobName="tms-docker-build-new" params={"BRANCH": "feature/xyz"}

Step 5 (Optional): Setup Slack DMs

setup_slack:
  botToken: xoxb-your-bot-token
  userId: U0123456789

How to get your Slack User ID:

1. Open Slack → Click your profile picture
2. Click "Profile" → Click "..." (more)
3. Click "Copy Member ID"

How to get bot token:

1. Go to https://api.slack.com/apps → Your App
2. OAuth & Permissions → Bot User OAuth Token (starts with xoxb-)

After setup, every trigger_build sends you a DM automatically.

---

Available Tools

Tool	Description
login_jenkins	Login + auto-discover jobs (opens browser for new users)
setup_slack	Configure Slack bot token + User ID for DM notifications
status	Check login status + job count
list_jobs	All jobs in table format (filterable)
job_details	Show parameters for a job
trigger_build	Trigger build + Slack DM + channel notify
refresh_jobs	Re-fetch jobs from Jenkins
whoami	Current user details
logout	Clear all credentials

---

Security

BuildPilot follows OWASP security best practices:

Credential Storage

• All credentials (API tokens, Slack tokens) are encrypted at rest using AES-256-GCM
• Encryption key is machine-bound (derived from hostname + user identity)
• Config file stored with 600 permissions (owner-read/write only)
• Atomic file writes prevent data corruption and race conditions

Network Security

• SSRF Protection — Private IPs, loopback, link-local, and cloud metadata endpoints (169.254.169.254) are blocked
• TLS enforced — Only HTTP/HTTPS protocols allowed
• Request timeouts — All HTTP calls have strict timeouts (10-30s)
• Redirect protection — Auth headers stripped on redirects

Input Validation

• Build parameter names validated against allowlist ([a-zA-Z0-9_\-.])
• Reserved parameter keys (token, cause, json, submit) are blocked to prevent injection
• Parameter values capped at 1000 characters
• Jenkins URL validated and sanitized before use

OAuth Security

• OAuth callback server binds to 127.0.0.1 only (not 0.0.0.0)
• CSRF state parameter uses crypto.randomBytes(32)
• Timing-safe comparison for state validation
• Rate limiting on callback endpoint (max 5 attempts)
• Auto-timeout after 2 minutes
• All non-callback routes rejected with 404

Error Handling

• Error messages sanitized to prevent credential leakage
• URLs, auth headers, and tokens are redacted from error output
• Error messages truncated to 200 characters

---

VS Code Extension

See vscode-extension/README.md for the full-featured VS Code extension with:

• Inline search, grouped jobs, pin/unpin
• Live build summary webview
• Stop running builds from history
• Slack notifications

---

Credentials

Stored encrypted at ~/.jenkins-slack-mcp/config.enc (AES-256-GCM, 600 permissions, owner-only).

Author

Seetharam1999