dsh-minimal-mcp

dsh-minimal-mcp

MCP server providing persistent bash and str_replace_editor tools from deepseek-harness's minimal agent preset, enabling file editing and shell command execution for external agents via stdio.

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README

dsh-minimal-mcp

deepseek-harness 的**极简模式(minimal agent preset)**的面向模型工具包装成一个 MCP server,供任意外部 agent(Claude Desktop、Trae、Cursor、LangChain 等)通过标准 MCP 协议接入调用。

极简模式(apps/cli/config/agent-presets/minimal/agent.cordis.yml)是 deepseek-harness 官方提供的最小双工具编码智能体,仅暴露两个工具:

  • bash — 持久 bash(PTY 会话,跨调用共享 cwd / 环境变量 / 函数 / 后台任务)
  • str_replace_editorview / create / str_replace / insert 文件编辑

本实现自研复刻并对齐原版语义@deepseek-ai/dsh-tool-bash-persistent@deepseek-ai/dsh-tool-str-replace-editor),不依赖完整 harness 运行时,跨平台、轻量、可独立运行。

工具语义(与原版对齐)

bash

  • 真实 PTY 持久 shell,命令间状态持久。
  • 非零退出码追加注释:[exit code: N]
  • 输出超过上限截断并标记 <response clipped>
  • 超时返回部分输出并重置 shell。

str_replace_editor

  • view:文件按 cat -n 风格加行号;目录列出非隐藏项、向下两级。
  • create:仅当路径不存在时创建,否则报错。
  • str_replaceold_str 必须唯一逐字匹配,多匹配 / 零匹配报错。
  • insertinsert_line 0-based,插入不额外加尾换行。

安装与构建

pnpm install
pnpm run build

首次安装会执行 postinstall 脚本,修复 node-pty 预编译二进制在 macOS 上的执行权限(缺失会导致 posix_spawnp failed)。

运行

node dist/index.js

环境变量

变量 默认 说明
DSH_CWD process.cwd() bash 与文件系统工具的工作目录
DSH_BASH_TIMEOUT_MS 60000 单条命令超时(毫秒),超时自动重置 shell 防卡死
DSH_MAX_OUTPUT_CHARS 16000 命令 / 文件输出保留字符上限
DSH_SHELL /bin/bash 用于 spawn 的 shell 路径

接入配置

以 Claude / 通用 MCP 客户端为例,在你的 MCP 配置中加入:

{
  "mcpServers": {
    "dsh-minimal": {
      "command": "node",
      "args": ["/absolute/path/to/dsh-mcp-tools/dist/index.js"],
      "env": {
        "DSH_CWD": "/your/workspace"
      }
    }
  }
}

一次服务调用暴露两个工具:bashstr_replace_editor,即为 deepseek-harness 极简模式的编码能力全集。

目录结构

src/
  index.ts   # MCP server 入口,注册两个工具(stdio 传输)
  config.ts  # 环境变量解析与描述文本
  bash.ts    # 持久 bash(node-pty)
  editor.ts  # str_replace_editor
scripts/
  fix-node-pty-perms.mjs  # 安装后修复 node-pty 二进制权限

说明

  • 传输方式为 stdio(MCP 标准,面向本地 agent)。如需 streamable-HTTP 可扩展。
  • 原版 bash 描述中提到"可通过镜像访问 apt/pip 包"等环境信息,本实现保留该描述文本但实际网络能力取决于运行环境。

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