最小权限工具访问
只授予每个工具真正需要的权限。
最小权限工具访问 是 CoddyKit 上的免费 MCP Academy 课时。 这是第 2 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 MCP Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 MCP Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
The Principle
Least privilege means each tool gets only the permissions its job requires, and nothing more. If a tool is tricked, the blast radius stays small. 🔒
Narrow the Scope
A tool that reads one report folder should not be able to touch the whole disk. Give it the smallest scope that still gets the work done, then stop there.
Read vs Write
Split read and write into separate tools when you can. A read-only tool that gets injected can leak data, but it cannot quietly change or delete anything.
Scope Credentials, Not Just Tools
Privilege also lives in the token your server holds. Use a database role or API key scoped to exactly the operations needed, so a slip cannot reach unscoped resources.
A Read-Only Tool
This tool can only look up an order, never modify one. The function body defines the ceiling on what the model can do through it.
@mcp.tool()
def get_order(order_id: int) -> str:
"Read one order by id."
return db.fetch_order(order_id)Avoid the God Tool
One run_anything tool that executes arbitrary code or SQL hands the model total control. Prefer many narrow tools with fixed, predictable behavior instead.
Allowlists Over Blocklists
Decide what is permitted, not what is forbidden. An allowlist of safe operations is far easier to reason about than trying to enumerate every dangerous one.
Constrain the Filesystem
If a tool reads files, pin it to one base directory and reject paths that escape it. A bounded root stops a tool from wandering into system files.
Separate Tools by Sensitivity
Keep low-risk lookups apart from high-risk actions. You can then apply stricter checks and confirmation to only the sensitive tools that truly need them.
Per-User Authorization
The server, not the model, decides who may do what. Check the caller's identity before acting so a tool cannot reach data outside that user's permissions.
Default Deny
Start every new tool from the assumption that it can do nothing, then grant exactly what it needs. A default-deny stance keeps accidental power from creeping in.
Quick Check
Pick the design that best follows least privilege.
Recap
Give each tool the smallest scope, split read from write, scope your credentials, and default to deny. Least privilege keeps any single mistake contained. ✅
常见问题解答
「最小权限工具访问」课时是免费的吗？
是的 — 「最小权限工具访问」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 MCP Academy 课程的其余内容，请升级到 CoddyKit PRO。 MCP Academy 课程共包含 4 节课。
「最小权限工具访问」这节课中我会学到什么？
只授予每个工具真正需要的权限。 你通过在浏览器中直接运行的动手代码来练习 MCP Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 MCP Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 MCP Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 2 节课，共 4 节。
「最小权限工具访问」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 MCP Academy 课中编写并运行代码吗？
能。每节 MCP Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。