PlatformIO MCP

PlatformIO MCP is a safe embedded development runtime for AI coding agents.

It exposes PlatformIO workflows for board discovery, project setup, build, flash, monitor, diagnostics, and task orchestration through:

• an MCP server adapter
• a first-class CLI adapter (platformio-mcp / pio-agent)
• an optional local dashboard for visibility and control

MCP is one adapter. PlatformIO is the first backend.

Quick Start

1. Run the dashboard

npx platformio-mcp dashboard

2. Use the CLI

npx platformio-mcp devices
npx platformio-mcp boards --filter esp32
npx platformio-mcp init --board esp32dev --framework arduino --project-dir ./firmware
npx platformio-mcp build --project-dir ./firmware
npx platformio-mcp flash --project-dir ./firmware --port auto
npx platformio-mcp monitor --project-dir ./firmware --port auto --expect BOOT_OK --timeout 30
npx platformio-mcp task-status <task-id>

Use --json for machine-readable output:

npx platformio-mcp build --project-dir ./firmware --json

3. Install into AI hosts

npx platformio-mcp install --cline
npx platformio-mcp install --claude
npx platformio-mcp install --vscode
npx platformio-mcp install --antigravity
npx platformio-mcp install --codex

Manual MCP Config

{
  "mcpServers": {
    "platformio": {
      "command": "npx",
      "args": ["-y", "platformio-mcp", "--open-dashboard-on-start"]
    }
  }
}

On Windows, use npx.cmd if your host requires explicit shim resolution.

Core Capabilities

• Board and device discovery for PlatformIO-supported hardware
• Project initialization and config inspection
• Build, upload, monitor, and background task polling
• Structured diagnostics for build/upload/serial failures
• Safety and policy guardrails (approval gates, audit logs, redaction)
• Dashboard visibility for commands, logs, locks, and safety state

Safety Model

PlatformIO MCP enforces policy decisions across CLI and MCP flows.

• Actions can be allow, deny, or requires_approval
• Risky operations (for example firmware upload/reset paths) require explicit approval
• All actions can be audited
• Secrets are redacted in exposed log streams

CLI approval workflows:

npx platformio-mcp approvals --status pending --json
npx platformio-mcp approve <approval-id> --json
npx platformio-mcp deny <approval-id> --json

Codex Usage

Codex-facing docs and prompt cookbook:

• Codex Usage Guide
• Codex Prompt Cookbook

Documentation

Getting started:

• LLM Installation Guide

Guides and references:

• Agent Customization Guide
• MCP Server Command Reference
• Troubleshooting Guide
• Agent Skills Directory

Specifications:

• PIO MCP Design Specification
• Web UX Design Specification
• Development Guide

Development

Prerequisites:

• Node.js >= 18
• PlatformIO Core CLI (install guide)

Local setup:

git clone https://github.com/jl-codes/platformio-mcp.git
cd platformio-mcp
npm install
npm run build
npm run test
npm run smoke-test

Contributing

Contributions are welcome.

• Open an issue for bugs or feature requests
• Submit a pull request with tests when applicable

License

MIT. See LICENSE.