vision-mcp
Integrates with OpenAI-compatible vision model endpoints (via the /chat/completions API), allowing AI agents that cannot see images to delegate image understanding tasks — such as detailed description and text transcription (OCR) — to vision models, with automatic failover across multiple configured providers.
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@vision-mcplook at /tmp/screenshot.png and explain the error"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
vision-mcp
Vision delegation MCP server — 让无法直接看图的 AI Agent 把图片理解任务委托给 OpenAI 兼容的视觉模型,支持多端点自动故障转移(failover)。
它解决什么问题
大多数 Agent 只有文本上下文,用户发来的图片在它眼里是 [Image omitted: ...] 占位符。vision-mcp 向 Agent 暴露一个 see 工具:
传入本地文件路径或 http(s) URL,可选附一个问题;
默认行为:详细描述图片并转写其中的文字(OCR);
依次尝试配置的多个视觉模型端点,某个端点失败自动切到下一个。
工具描述里内置了防滥用守卫:如果 Agent 自己能看图,就不该调用这个工具。
Related MCP server: Vision MCP Server
安装
需要 Python ≥ 3.10。推荐用 uv:
# 方式一:从 GitHub 直接安装为全局命令
uv tool install git+https://github.com/dreamskyali2026-boop/vision_mcp.git
# 方式二:pip
pip install git+https://github.com/dreamskyali2026-boop/vision_mcp.git安装后得到 vision-mcp 命令(stdio 传输的 MCP server)。
也可以克隆源码运行:
git clone https://github.com/dreamskyali2026-boop/vision_mcp.git
cd vision_mcp
uv sync
uv run vision-mcp配置
1. 配置文件(必需)
创建 ~/.vision-mcp/config.json,参考 config.example.json:
{
"providers": [
{
"name": "glm-coding",
"base_url": "https://open.bigmodel.cn/api/coding/paas/v4/chat/completions",
"model": "glm-5.3-flash",
"api_key": "YOUR_KEY",
"timeout": 120
},
{
"name": "glm-free",
"base_url": "https://open.bigmodel.cn/api/paas/v4/chat/completions",
"model": "glm-4v-flash",
"api_key": "YOUR_KEY",
"timeout": 60,
"max_tokens": 1024
}
]
}字段说明:
字段 | 必填 | 默认 | 说明 |
| ✅ | — | 端点名称,用于日志 |
| ✅ | — | OpenAI 兼容的 |
| ✅ | — | 视觉模型名 |
| ❌ |
| API 密钥 |
| ❌ |
| 单次请求超时(秒),必须 > 0 |
| ❌ |
| 采样温度,必须 ≥ 0 |
| ❌ |
| 回复 token 上限 |
| ❌ |
| 图像 detail 参数 |
providers 按数组顺序做 failover:第一个失败自动尝试下一个。
2. 环境变量(可选覆盖)
同时设置 VISION_BASE_URL 和 VISION_MODEL 时,该端点会被插到列表最前面优先使用:
VISION_BASE_URL=https://example.com/v1/chat/completions
VISION_MODEL=some-vision-model
VISION_API_KEY=sk-xxx
VISION_TIMEOUT=120注册到 MCP 客户端
Qoder / Claude Code
claude mcp add vision -- vision-mcp或写入用户级 ~/.claude/settings.json(Qoder 为 ~/.qoder-cn/settings.json):
{
"mcpServers": {
"vision": {
"command": "vision-mcp"
}
}
}Cursor / 通用 mcpServers 配置
{
"mcpServers": {
"vision": {
"command": "uvx",
"args": ["--from", "git+https://github.com/dreamskyali2026-boop/vision_mcp.git", "vision-mcp"]
}
}
}使用
注册后 Agent 会获得一个 see 工具:
参数 | 类型 | 说明 |
| string | 本地文件路径或 http(s) URL |
| string? | 可选问题;缺省为"详细描述图片并转写文字" |
示例(Agent 视角):
see(image="/tmp/screenshot.png", question="这个报错信息是什么意思?")
see(image="https://example.com/chart.png")所有 Agent 返回内容都带 untrusted 前缀标记,提示调用方将视觉模型输出当作数据而非指令(防提示注入)。
安全特性
本地文件做魔数嗅探(不信任扩展名):仅接受 png / jpeg / gif / webp / bmp,防止把任意本地文件(如密钥)外传给视觉端点;
单图上限 20 MB;
图片 URL 不允许携带
user:pass@host凭据;非 https 的
base_url会输出明文告警;配置校验:timeout / temperature / max_tokens 越界直接报配置错误。
开发
git clone https://github.com/dreamskyali2026-boop/vision_mcp.git
cd vision_mcp
uv sync
uv run pytest # 运行测试项目结构:
src/vision_mcp/
├── server.py # MCP server 入口,暴露 see 工具(stdio)
├── providers.py # 读取 ~/.vision-mcp/config.json + 环境变量
└── vision.py # 图片处理(嗅探/base64)、多端点 failover 调用License
MIT
This server cannot be deployed
Maintenance
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