# Don't Hand Claude Your Docker Socket -- Build It a Guarded One

DevFeed: [Don't Hand Claude Your Docker Socket -- Build It a Guarded One](<https://devfeed.tech/articles/don-t-hand-claude-your-docker-socket-build-it-a-guarded-one-93924.md>)

Original publisher: [Read original article](<https://hackernoon.com/dont-hand-claude-your-docker-socket-build-it-a-guarded-one?source=rss>)

Author: Siva Sai Krishna Suryadevara

Published: 2026-10-21T21:17:14Z

Content type: tutorial

Language: en

Sources: [HackerNoon](<https://devfeed.tech/sources/hackernoon.md>)

Topics: [Docker](<https://devfeed.tech/topics/docker.md>), [Dockerfile](<https://devfeed.tech/topics/dockerfile.md>), [Claude](<https://devfeed.tech/topics/claude.md>), [Docker Compose](<https://devfeed.tech/topics/docker-compose.md>), [anthropic](<https://devfeed.tech/topics/anthropic.md>)

Tags: [access-control](<https://devfeed.tech/tags/access-control.md>), [ai-agents](<https://devfeed.tech/tags/ai-agents.md>), [api-keys](<https://devfeed.tech/tags/api-keys.md>), [ci](<https://devfeed.tech/tags/ci.md>), [claude](<https://devfeed.tech/tags/claude.md>), [claude-ai](<https://devfeed.tech/tags/claude-ai.md>), [claude-code](<https://devfeed.tech/tags/claude-code.md>), [compose](<https://devfeed.tech/tags/compose.md>), [devops](<https://devfeed.tech/tags/devops.md>), [docker](<https://devfeed.tech/tags/docker.md>), [llm-security](<https://devfeed.tech/tags/llm-security.md>), [llm-tools](<https://devfeed.tech/tags/llm-tools.md>), [mcp](<https://devfeed.tech/tags/mcp.md>), [mcp-server](<https://devfeed.tech/tags/mcp-server.md>), [python](<https://devfeed.tech/tags/python.md>), [socket](<https://devfeed.tech/tags/socket.md>)

## AI overview

The Python FastMCP server gives Claude four Docker tools: container listing, inspection, log retrieval with anomaly scanning, and guarded restart. A read-only socket mount does not block Docker API writes, so restart is disabled by default and, when enabled, checked against Docker's resolved container name to prevent ID-based bypasses; a denylist takes precedence over an optional allowlist. Inspection returns environment variable names but withholds values, while log output and scans are capped. The server returns structured errors for daemon failures and keeps diagnostics off stdio JSON-RPC stdout. Its 47 tests mock Docker and do not require a daemon. The article cautions that tool-layer guards are not a security boundary for other processes with socket access, and suggests a filtering proxy for API-level restriction. It also pins the official `mcp` SDK below 2 because the documented FastMCP API changed in 2.x.

## Source excerpt

A Python MCP server that gives Claude read-only access to Docker, with a name-resolved restart guard, secret redaction, and a 47-test mocked suite.