6.2 连接常用服务

安装 MCP Server 的统一方式

所有 MCP Server 的安装命令格式都一样：

claude mcp add <名称> --transport <协议> [-- <命令或URL>]

安装后立即生效，不需要重启 Claude Code。

下面逐个介绍最常用的几个。

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GitHub MCP

能做什么： 直接操作 GitHub 仓库——搜索 issue、读 PR 内容、查看 CI 状态、创建 issue、发表评论。

安装：

claude mcp add github --transport stdio \
  --env GITHUB_PERSONAL_ACCESS_TOKEN=<你的token> \
  -- npx -y @modelcontextprotocol/server-github

在 github.com/settings/tokens 生成一个 Personal Access Token，勾选 repo 和 issues 权限。

安装后能做的事：

search for open issues labeled "bug" in the repo,
find the 3 most recently commented ones and summarize them

check the CI status of the latest commit on the main branch.
if any checks are failing, show me the error logs

look at PR #142, summarize the changes, and check if
there are any review comments I haven't responded to

create a GitHub issue for the bug we just fixed:
title should describe the root cause, body should include
the fix summary and link to the commit

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Slack MCP

能做什么： 读取频道消息、发送消息、搜索历史、查看未读通知。

安装：

claude mcp add slack --transport stdio \
  --env SLACK_BOT_TOKEN=<你的bot-token> \
  --env SLACK_TEAM_ID=<你的team-id> \
  -- npx -y @modelcontextprotocol/server-slack

Slack Bot Token 在 api.slack.com/apps 创建应用后获取，需要 channels:read、chat:write、channels:history 权限。

安装后能做的事：

check #eng-alerts for any new alerts since yesterday morning,
summarize the critical ones

post a message to #deployments:
"Deployed v2.3.1 to staging — includes the payment fix from PR #142.
Please test before EOD."

search Slack for any discussion about the "user session timeout" bug
we're working on — what context is there?

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PostgreSQL MCP

能做什么： 直接对 PostgreSQL 数据库执行查询（只读，不执行写操作——除非你明确配置允许）。

安装：

claude mcp add postgres --transport stdio \
  -- npx -y @modelcontextprotocol/server-postgres \
  "postgresql://user:password@localhost:5432/dbname"

⚠️ 强烈建议使用只读数据库账号，不要把有写权限的连接字符串给 MCP。

安装后能做的事：

show me the database schema — what tables exist and
what are the relationships between them?

how many users signed up in the last 7 days?
break it down by day and show the trend

find all orders from the last 24 hours that are in
"pending" status for more than 2 hours.
these might be stuck — show me the order IDs and amounts

the checkout error we're debugging — query the logs table
for any errors with code "PAYMENT_FAILED" from today,
show the most recent 10 with their user IDs

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Figma MCP

能做什么： 读取 Figma 文件的设计内容、组件结构、样式定义。

安装：

claude mcp add figma --transport http \
  https://figma.com/api/mcp

注意：Figma MCP 需要你在 figma.com 的设置里先开启 MCP 访问权限，并获取你的专属 URL。

安装后能做的事：

look at the new dashboard design in Figma,
and update the React components in src/components/Dashboard/
to match the latest design. focus on the card layout and color changes.

extract all the color tokens from our Figma design system
and update the tailwind.config.js to match

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组合使用：真正的威力在这里

单独用每个 MCP 已经很有用了，但组合使用才是真正改变工作流的地方：

I just fixed the payment timeout bug.

1. check the GitHub issue #89 to confirm this fix addresses
   all the reported scenarios

2. query the production DB to find out how many users
   were affected by this bug in the last 7 days

3. update the GitHub issue with a comment summarizing
   the fix and the impact numbers

4. post to #product-updates Slack channel:
   "Payment timeout bug fixed. Affected X users over 7 days.
   Fix deployed to staging, production rollout tomorrow."

一条指令，Claude Code 跨四个系统完成任务。这就是为什么说 MCP 是 Claude Code 进入"真正有用"阶段的关键。

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验证 MCP 连接是否正常

安装完之后，可以测试一下连接：

# 列出所有已安装的 MCP Server
claude mcp list

# 查看某个 Server 的详细信息
claude mcp get github

在 Claude Code 会话里，输入：

list all the tools available from the github MCP server

它会列出所有可用的工具，确认连接正常。

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下一节，我们来看 MCP 的配置文件结构，以及管理多个 MCP Server 的最佳实践。