DevTools MCP

Developer Toolkit MCP

Five high-frequency developer utilities as MCP tools — UUID generation, timestamp conversion (Beijing time), unit conversion, JSON formatting/validation, and QR-code generation. Everything runs locally; four of the five tools use only the Python standard library.

• Try it in 30 seconds: a free public MCP endpoint is already running — just paste the URL into your MCP client (no install, no API key).
• Or self-host: a tiny FastMCP server, no external API calls, deterministic and privacy-safe.

⚡ Use the hosted endpoint (no setup)

https://mcp.pianam.cn/devtools-mcp/mcp

Transport: Streamable HTTP (MCP 2025-03-26 compatible). No authentication required.

🔌 Client configuration

Add this to your MCP client's mcpServers configuration (Claude Desktop, Cursor, Cline, Cherry Studio, etc.):

{

"mcpServers": { "devtools": { "type": "http", "url": "https://mcp.pianam.cn/devtools-mcp/mcp" } } }

Clients that do not accept "type": "http" accept the same entry with just "url".

🧰 Tools

| Tool | Parameters | Returns | |

---|---|---| | generate_uuid(version="v4", count=1, namespace=null, name=null) | version: v4 random (default) or v5 namespaced SHA-1. count: 1–1000. For v5: namespace (dns/url/oid/x500 or a full UUID) + name. | List of UUID strings (v5 is deterministic for the same namespace+name). | | convert_timestamp(value=null, to="iso") | value: Unix timestamp in seconds or milliseconds (auto-detected, int or numeric string) or a date/time string (2026-09-05, 2026-09-05 10:30:00, ISO 8601…). Omit for "now". | ISO 8601 Beijing-time string + readable form + Unix seconds/milliseconds + weekday; or the reverse conversion from a date string. All times use Asia/Shanghai (UTC+8). | | convert_unit(value, from_unit, to_unit) | Numeric value and units across length (m/km/cm/mm/mile/foot/inch…), weight (kg/g/mg/t/lb/oz…), temperature (c/f/k, with offset), data storage (B/KB/MB/GB/TB/PB, binary 1024). Chinese unit names also accepted. | Converted result plus a readable equation; cross-category conversion (e.g. meters to kilograms) returns a clear error. | | format_json(data, action="format") | data: JSON string. action: format (pretty, 2-space indent, Chinese unescaped) / minify / validate. | Formatted/minified text with length comparison, or a validity verdict; on invalid JSON returns error line/column, a position pointer and a context snippet. | | generate_qr(content, format="svg") | content: URL/text/WiFi string (≤ 2000 bytes). format: svg (default, vector) or png. | SVG markup string (save as .svg; an agent can write the file directly) or, for PNG, base64 + data URI (PNG requires Pillow). |

Examples

• "生成 5 个 UUID" / "给域名 example.com 生成一个 v5 UUID"
• "把时间戳 1788000000 转成北京时间" / "2026-10-01 09:00 的 Unix 时间戳是多少"
• "10 英里等于多少公里" / "98.6 华氏度转摄氏度" / "1 GB 等于多少 MB"
• "帮我美化这段 JSON 并检查有没有语法错误"
• "把 https://example.com 生成二维码"

📡 Dependencies & privacy

• generate_uuid, convert_timestamp, convert_unit, format_json use only the Python standard library.
• generate_qr uses the pure-Python qrcode package with its SVG path image factory — SVG output needs no Pillow/native deps. PNG output is optional and requires Pillow.
• Zero network calls, zero API keys — fully deterministic and safe for sensitive data.

🐢 Self-hosting

git clone https://github.com/boy-373/devtools-mcp.git

cd devtools-mcp pip install -r requirements.txt python server.py

listens on 127.0.0.1:8000 by default; override with:

MCP_HOST=0.0.0.0 MCP_PORT=9000 python server.py

behind a reverse proxy, allow your public hostname:

MCP_ALLOWED_HOSTS="your-domain.com,your-domain.com:*" python server.py

Then point your MCP client at http://127.0.0.1:8000/mcp.

With uv:

uv venv && uv pip install -r requirements.txt

uv run python server.py

🗂️ Files

• devtools_server.py — the MCP server: all five tools and FastMCP definitions.
• server.py — standalone Streamable HTTP entry point (serves the MCP app at /mcp).
• requirements.txt — Python dependencies.
• LICENSE — MIT.

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🇨🇳 中文说明

开发者工具包 MCP：五个高频小工具 —— UUID 生成（v4/v5）、时间戳双向转换（统一北京时间 UTC+8）、单位换算（长度/重量/温度/数据存储）、JSON 美化/压缩/校验（带错误定位）、二维码生成（默认矢量 SVG，可选 PNG）。

在线直连（免费、无需 Key）：https://mcp.pianam.cn/devtools-mcp/mcp

前四个工具仅用 Python 标准库；二维码用纯 Python 的 qrcode 生成 SVG（PNG 才需 Pillow）。全程无任何网络请求与外部 API，确定性、隐私安全。

📄 License

MIT © 2026 boy-373 (刘扶阳)