# Docker MCP Server [Health: Active]

**Category:** ☁️ Cloud Platforms  
**Repository:** https://github.com/hypnosis/docker-mcp-server  
**GitHub Stars:** 0  
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**Directory Page:** https://allmcps.com/mcp/docker-mcp-server

## Description
Docker for AI agents — containers, compose stacks, logs and databases, locally or over SSH.

## Claude Desktop Quick Installation
Install path detected from listing signals. Uses `npx` (confidence: high):

```json
"mcpServers": {
  "docker-mcp-server": {
    "command": "npx",
    "args": ["-y","@hypnosis/docker-mcp-server"]
  }
}
```

## Documentation & README

# Docker MCP Server — Docker tools for AI agents

**A Docker MCP server that lets AI agents operate Compose stacks with structured,
Docker-native tools — instead of brittle shell commands and terminal-shaped output.**

Inspect containers, read logs, check health, query databases, take dumps, and bring stacks up or
down — on your laptop or on a server across the world by naming its profile.

It speaks Docker the way you do: your compose files, project names, and service names. Answers
come back as named fields with enough context for an agent to act on them, rather than parse an
ASCII table and guess.

Works with Claude Code, Codex CLI, Cursor, opencode, Gemini CLI, Qwen Code and other MCP clients.

[![MCP Registry](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fregistry.modelcontextprotocol.io%2Fv0%2Fservers%3Fsearch%3Dio.github.hypnosis%2Fdocker-mcp-server%26version%3Dlatest&query=%24.servers%5B0%5D.server.version&style=flat-square&logo=modelcontextprotocol&logoColor=white&label=MCP%20Registry&color=0F172A)](https://registry.modelcontextprotocol.io/v0/servers?search=io.github.hypnosis/docker-mcp-server&version=latest) [![npm version](https://img.shields.io/npm/v/@hypnosis/docker-mcp-server?style=flat-square&logo=npm&logoColor=white&color=CB3837)](https://www.npmjs.com/package/@hypnosis/docker-mcp-server) [![npm downloads](https://img.shields.io/npm/dm/@hypnosis/docker-mcp-server?style=flat-square&logo=npm&logoColor=white&color=2EA043&label=downloads)](https://www.npmjs.com/package/@hypnosis/docker-mcp-server) [![tests](https://img.shields.io/github/actions/workflow/status/hypnosis/docker-mcp-server/test.yml?branch=main&style=flat-square&logo=githubactions&logoColor=white&label=tests)](https://github.com/hypnosis/docker-mcp-server/actions/workflows/test.yml) [![License: MIT](https://img.shields.io/badge/license-MIT-yellow?style=flat-square)](LICENSE)

**[Install](#install-in-30-seconds) · [Tools](#docker-mcp-tools-for-containers-compose-and-databases) · [Setup](#set-up-the-docker-mcp-server) · [Security](#destructive-command-protection-for-ai-agents) · [Docs](https://github.com/hypnosis/docker-mcp-server/blob/HEAD/docs/tools.md) · [Changelog](https://github.com/hypnosis/docker-mcp-server/blob/HEAD/CHANGELOG.md)**

---

## Install in 30 seconds

No global installation required. `npx` downloads the package on first use:

```bash
npx -y @hypnosis/docker-mcp-server
```

Add it to your MCP client — **Claude Code**, for example — for every project:

```bash
claude mcp add docker -s user -- npx -y @hypnosis/docker-mcp-server
```

That is the whole setup for the Docker on this machine. No profiles file, no environment
variables: the server uses the local Docker socket, and the compose project of your working
directory is the project it answers about.

For a Docker host on another machine, add one file with the servers you reach over SSH:

```bash
claude mcp add docker -s user \
  -e DOCKER_MCP_PROFILES_FILE="$HOME/.claude/docker-profiles.json" \
  -- npx -y @hypnosis/docker-mcp-server
```

```json
{
  "default": "local",
  "profiles": {
    "local": { "mode": "local" },
    "production": {
      "host": "prod.example.com",
      "username": "deployer",
      "privateKeyPath": "~/.ssh/id_ed25519"
    }
  }
}
```

Now every tool takes a `profile`, and `docker_health({ action: "profiles" })` lists what the
server was given.

Codex, Cursor, opencode and other clients are covered in
[Set up the Docker MCP server](#set-up-the-docker-mcp-server).

### Install as a plugin

Some clients — **Claude Code**, for example — can take the whole thing as a plugin instead:

```
/plugin marketplace add hypnosis/docker-mcp-server
/plugin install docker-mcp-server@docker-mcp-server
```

The plugin brings the server up against the Docker on this machine, with no configuration at
all. Point it at other hosts the same way as above, with `DOCKER_MCP_PROFILES_FILE`.

### Requirements

[![Node.js](https://img.shields.io/node/v/@hypnosis/docker-mcp-server?style=flat-square&logo=nodedotjs&logoColor=white&color=5FA04E)](https://nodejs.org/) [![TypeScript](https://img.shields.io/npm/dependency-version/@hypnosis/docker-mcp-server/dev/typescript?style=flat-square&logo=typescript&logoColor=white&color=3178C6&label=typescript)](https://www.typescriptlang.org/) [![MCP SDK](https://img.shields.io/npm/dependency-version/@hypnosis/docker-mcp-server/@modelcontextprotocol/sdk?style=flat-square&logo=modelcontextprotocol&logoColor=white&color=0F172A&label=MCP%20SDK)](https://modelcontextprotocol.io/)

**Node.js 18+** and a Docker daemon you can already reach — the local socket, or a remote host
over SSH with a key.

The server starts whether or not Docker is up. A call made while the daemon is down answers
"start Docker" and works on the next try, without restarting your MCP client.

Prefer a pinned version, offline work, or one less registry check per launch:
`npm install -g @hypnosis/docker-mcp-server`, then use `docker-mcp-server` as the command
instead of `npx`.

## Who this Docker MCP server is for

- **AI-assisted developers** who build, run, and debug applications with Docker Compose.
- **Backend and full-stack developers** who need their coding agent to inspect containers, logs,
  health checks, databases, and Compose services while solving a problem.
- **Independent developers and small product teams** who deploy Docker applications to their own
  servers and want one agent workflow for local development and production.
- **Platform engineers** who maintain Docker environments across development, staging, and
  production hosts.
- **DevOps engineers and SREs using AI coding agents** for incident checks, routine container
  work, and faster investigation of Compose-based services.
- **Agencies and technical teams maintaining client applications**, where an agent needs to
  understand an unfamiliar Compose stack before making a change.
- **QA and release engineers** who need repeatable visibility into test stacks, service health,
  logs, and databases before a release.

## Why use a Docker MCP server instead of raw Docker CLI?

Docker CLI is excellent for a person at a terminal. An AI agent needs something different: Docker
and Compose concepts it can query directly, results it can reason about, and clear boundaries
between what happened, what was not found, and what could not be checked.

### Less context, lower AI cost

`docker ps`, `docker stats`, and `docker logs` are designed to be read on a screen. Their output
mixes labels, values, units, and formatting into text an agent must parse before it can use it.

A Docker MCP tool returns the fields the task needs: service, project, state, health, ports,
timestamps, byte counts, exit codes, and log streams. The agent receives less terminal noise,
spends fewer tokens interpreting it, and keeps more context for the problem it is solving.

### Debug Docker Compose as a system

A Docker application is more than a list of containers. It is a Compose project with services,
dependencies, health checks, logs, databases, and resources that affect one another.

The server lets an agent ask about that system in the names you use every day: the project,
service, and Compose file. One call can show the state and health of a stack; another can inspect
a bounded log window, measure a service, or query the database already running beside it. The
agent spends its turns finding the cause, not assembling and decoding shell commands.

### Make decisions from explicit results

A shell command can return an empty table, clipped output, or an error printed alongside ordinary
text. For an agent, those are different situations — and treating them as the same leads to
guesses.

Docker MCP results say what was found, what was not found, what was cut short, and why an action
did not run. A missing healthcheck is not a failed healthcheck; an empty list is not a failed
read; a command with no exit code never started. That gives the agent a reliable basis for its
next step, and gives you fewer confident-looking but wrong fixes.

## Manage local and remote Docker hosts over SSH

Use the same Docker MCP tools on the Docker daemon beside you and on a remote server. A remote
Docker host is a profile: a stable name, its SSH connection, and the authentication it needs.
The agent names that profile in a tool call:

```typescript
docker_container({ "action": "list", "profile": "production" })
```

Leave `profile` out and the default Docker host answers, so local development stays frictionless.
Name a profile the server does not know and the response lists the profiles it does know instead
of quietly sending a request to another machine.

Remote Docker Compose projects are resolved by the labels their containers already carry. Ask for
a project by name wherever it lives on that host — no remote working directory or fixed Compose
path to maintain. For a project that has not run there yet, pass its file explicitly with
`compose_path`.

## Built for the Model Context Protocol

A native Docker MCP server built on the official MCP SDK, with structured tools designed for
AI agents rather than terminal automation.

Its behaviour is covered by unit tests and end-to-end tests that run against real Docker
containers, not only mocks.

---

## Docker MCP vs Docker CLI: practical examples

The Docker CLI is the right interface when a person is driving the terminal. These examples show
what changes when an AI agent needs to inspect a Docker Compose application, understand the
result, and choose the next safe step.

Each comparison uses the same real-world task: first the commands and output an agent would have
to work through, then the structured Docker MCP result it can use directly.

### Diagnose the health of a Docker Compose stack

> **Situation:** A deploy just went out. The site is slow, and you do not know whether a
> container is down, a healthcheck is failing, or something is eating the memory.
>
> **Question:** "Is this stack healthy?"

#### Raw docker CLI

```console
$ docker compose ps
NAME              IMAGE               STATUS                     PORTS
shop-api-1        shop-api:latest     Up 4 minutes (healthy)     0.0.0.0:8080->8080/tcp
shop-postgres-1   postgres:16         Up 4 minutes (unhealthy)   5432/tcp
shop-worker-1     shop-worker:latest  Exited (1) 2 minutes ago
$ docker stats --no-stream
CONTAINER ID   NAME              CPU %   MEM USAGE / LIMIT     MEM %   NET I/O          BLOCK I/O
1f2c4d5e6a7b   shop-api-1        3.10%   214.8MiB / 7.66GiB    2.74%   12.4MB / 8.9MB   0B / 4.1MB
9a8b7c6d5e4f   shop-postgres-1   0.42%   1.204GiB / 7.66GiB    15.7%   3.2MB / 44MB     112MB / 890MB
$ docker inspect --format '{{.State.Health.Status}}' shop-postgres-1
unhealthy
$ docker inspect --format '{{.State.Health.Status}}' shop-worker-1
Template parsing error: executing "" at <.State.Health.Status>: nil pointer evaluating *types.Health.Status
```

Three commands, three formats, and the last one fails because the worker image declares no
healthcheck at all. Nothing is broken — there is simply nothing to read — but the agent now has
to tell "no healthcheck" apart from "failing", and a table gives it no help.

#### Structured MCP result

```typescript
docker_container({ "action": "list", "project": "shop" })
```

```json
{
  "action": "list",
  "project": "shop",
  "containers": [
    { "name": "shop-api-1", "service": "api", "project": "shop", "state": "running",
      "health": "healthy", "image": "shop-api:latest",
      "ports": ["0.0.0.0:8080->8080/tcp"], "created": "2026-08-24T09:14:02Z" },
    { "name": "shop-postgres-1", "service": "postgres", "project": "shop", "state": "running",
      "health": "unhealthy", "image": "postgres:16",
      "ports": ["5432/tcp"], "created": "2026-08-24T09:14:01Z" },
    { "name": "shop-worker-1", "service": "worker", "project": "shop", "state": "exited",
      "health": null, "image": "shop-worker:latest",
      "ports": [], "created": "2026-08-24T09:14:01Z" }
  ],
  "reason": null,
  "legend": {
    "containers[].state=running": "Running now.",
    "containers[].state=exited": "Stopped. Its logs survive, its processes do not.",
    "containers[].health=healthy": "Its own healthcheck passed last run.",
    "containers[].health=unhealthy": "Its own healthcheck failed enough times in a row to give up on it.",
    "containers[].health=null": "The image declares no healthcheck, so nothing is measured. Not the same as failing."
  }
}
```

#### What changes for the agent

| Raw docker CLI | Structured MCP | Your gain |
|---|---|---|
| Three commands and three output formats | One call with state, health and ports per service | Fewer round trips |
| A missing healthcheck errors out or reads as failure | `health: null` is explained in the answer itself | No container blamed for a check nobody wrote |
| Container names must be mapped back to services | Every row carries `service`, `project` and `name` | The agent speaks compose, not container ids |

The legend explains only the words this answer used, right next to the fields that used them —
so the meaning of `unhealthy` is not sitting hundreds of messages back in a tool description.

**Need numbers rather than states?** `docker_container({ action: "stats", service: "postgres" })`
returns CPU, memory against its limit, network and disk as numbers, with the answer saying
plainly that it is one instant reading and not an average.

**Need the healthchecks themselves?** `docker_health({ action: "services" })` reports each
service's own verdict, counts its checks and failures, and calls a service with no healthcheck
`none` rather than counting it as sick.

### Investigate container logs without losing context

> **Situation:** The API started returning 502 about ten minutes ago. The container has been
> running for a week and has written hundreds of thousands of lines.
>
> **Question:** "What did it print when it broke?"

#### Raw docker CLI

```console
$ docker compose logs api --tail 200
api-1  | 2026-08-24T10:31:07.104Z INFO  request GET /health 200 3ms
api-1  | 2026-08-24T10:31:07.882Z INFO  request GET /health 200 2ms
... 196 more lines of the same ...
api-1  | 2026-08-24T10:39:14.522Z ERROR database connection timed out after 30000ms
$ docker compose logs api --since 10m | grep -i error
api-1  | 2026-08-24T10:39:14.522Z ERROR database connection timed out after 30000ms
```

The first call spent two hundred lines of context on health-check noise. The second found the
error but threw away the lines around it, and nothing in either output says whether the stream
was stdout or stderr, or whether anything was dropped on the way.

#### Structured MCP result

```typescript
docker_logs({ "service": "api", "project": "shop", "since": "10m", "lines": 50 })
```

```json
{
  "service": "api",
  "project": "shop",
  "date": "2026-08-24",
  "lines": [
    { "stream": "stdout", "time": "10:39:14.518",
      "text": "INFO  pool exhausted, waiting for a free connection" },
    { "stream": "stderr", "time": "10:39:14.522",
      "text": "ERROR database connection timed out after 30000ms" },
    { "stream": "stderr", "time": "10:39:14.530",
      "text": "ERROR upstream 502 while proxying GET /api/orders" }
  ],
  "returned_lines": 3,
  "since": "10m",
  "until": null,
  "truncated": false,
  "truncated_reason": null,
  "clipped_lines": 0,
  "follow": false,
  "reason": null,
  "legend": {
    "lines[].stream=stderr": "the stream the container wrote to; many programs write their ordinary progress there, so a line is not an error for being here"
  }
}
```

#### What changes for the agent

| Raw docker CLI | Structured MCP | Your gain |
|---|---|---|
| A tail is a guess: too few lines miss it, too many bury it | `since` and `until` cut the window by time, then `lines` counts | Fewer tokens on noise |
| One text blob; stream and timestamp are glued into it | Every line carries its own `stream`, `time` and `text` | Errors are found by field, not by grep |
| A dropped middle looks exactly like a quiet log | `truncated`, `truncated_reason` and `clipped_lines` name every cut | No "the logs are clean" from a partial read |

The day the lines fall on is said once, at the top, and each line then carries only its time —
the same stamp repeated on every line is text you would be paying for. Lines spread across more
than one day keep their full stamps, and the answer says why.

`since` also takes a date or a UNIX timestamp, and `follow: true` waits for lines still to come,
returning what arrived within its own time and size ceiling instead of hanging on an open stream.

### Query a database running in Docker

> **Situation:** Orders stopped appearing on the dashboard. You want to look in the database —
> which is a container, with a client inside it and no port published to your machine.
>
> **Question:** "What does the table actually hold?"

#### Raw docker CLI

```console
$ docker compose exec -T postgres psql -U app -d shop -c "select status, count(*) from orders group by status"
  status   | count
-----------+-------
 paid      |  1284
 pending   |    17
(2 rows)
$ docker compose exec -T redis redis-cli info keyspace
db0:keys=41822,expires=41822,avg_ttl=3600000
```

Every engine needs its own client, its own flags and its own way of naming the user and the
database. Get one flag wrong and the shell prints an error the agent has to read as text — the
call itself "succeeded".

#### Structured MCP result

```typescript
docker_db({ "action": "query", "service": "postgres", "project": "shop",
            "query": "select status, count(*) from orders group by status" })
```

```json
{
  "action": "query",
  "service": "postgres",
  "project": "shop",
  "engine": "postgresql",
  "query": "select status, count(*) from orders group by status",
  "output": "  status   | count\n-----------+-------\n paid      |  1284\n pending   |    17\n(2 rows)",
  "stderr": "",
  "exit_code": 0,
  "clipped_bytes": 0,
  "warnings": [],
  "reason": null,
  "legend": {}
}
```

#### What changes for the agent

| Raw docker CLI | Structured MCP | Your gain |
|---|---|---|
| A different client, flag set and user for every engine | One tool for PostgreSQL, MySQL/MariaDB, Redis, MongoDB and SQLite | One thing to learn, five databases |
| A refused statement still looks like a successful command | `exit_code` and `stderr` stay apart from `output` | A failure reads as a failure |
| Credentials get retyped into the command line | The container's own user and database are the default | Fewer secrets in the transcript |

`status` asks the database about itself instead — version, size, uptime, connections — and
`format: "csv"` lays PostgreSQL rows out for parsing. A statement that would destroy a database
or a whole keyspace does not run until it carries the confirmation marker; see
[Destructive command protection for AI agents](#destructive-command-protection-for-ai-agents).

### Back up a database before a risky migration

> **Situation:** A migration is about to rewrite a table. You want a dump first — and you want
> to know the dump is real before the migration touches anything.
>
> **Question:** "Do I actually have a backup?"

#### Raw docker CLI

```console
$ docker compose exec -T postgres pg_dump -U app shop | gzip > backup.sql.gz
$ echo $?
0
$ ls -lh backup.sql.gz
-rw-r--r--  1 you  staff    20B 24 Aug 11:02 backup.sql.gz
```

Exit code zero came from `gzip`, the last command in the pipe — not from `pg_dump`. Twenty
bytes is an empty archive: the dump failed on a wrong user, the error went to the terminal, and
the shell reported success. A migration now runs on the strength of a backup that does not exist.

#### Structured MCP result

```typescript
docker_db_admin({ "action": "backup", "service": "postgres", "project": "shop" })
```

```json
{
  "action": "backup",
  "service": "postgres",
  "project": "shop",
  "engine": "postgresql",
  "file": "/backups/shop-2026-08-24T11-02-17.dump.gz",
  "bytes": 48219553,
  "verified": true,
  "message": null,
  "confirmed": false,
  "restarted": false,
  "reason": null,
  "legend": {
    "verified": "The file was read back around the call, and bytes is its size on disk. This is the difference between a dump that exists and a command that did not fail."
  }
}
```

#### What changes for the agent

| Raw docker CLI | Structured MCP | Your gain |
|---|---|---|
| A pipe reports the exit code of its last command | The dump is read back and its size named | An empty backup cannot pass for a good one |
| Each engine needs its own dump command and flags | One call for PostgreSQL, MySQL, MongoDB, SQLite and Redis | Same workflow whatever the stack runs |
| "Done" is a word | `verified` is a field, and `bytes: null` says why it is unknown | The agent knows what it does not know |

When the file cannot be read back, the answer says so instead of claiming a size: `verified`
stays false, `bytes` is `null`, and `message` names what stopped it — an unknown size is never
reported as an empty file.

Filling the database back is the same tool: `action: "restore"`. It overwrites what is there,
so it is refused until the call carries the confirmation marker in its `confirm` field — and the
refusal tells you to take a backup here first.

### Understand Docker disk usage before cleaning up

> **Situation:** The server is at 90% disk. Docker is the obvious suspect, but you do not know
> whether it is images, volumes, stopped containers or build cache — and pruning the wrong one
> destroys a database.
>
> **Question:** "What is safe to reclaim?"

#### Raw docker CLI

```console
$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          48        9         31.2GB    22.4GB (71%)
Containers      21        7         1.8GB     412MB (22%)
Local Volumes   19        6         64.9GB    38.1GB (58%)
Build Cache     264       0         9.7GB     9.7GB
$ docker system df -v | head -40
... several screens of per-image, per-container and per-volume tables ...
```

The summary is readable by a person and expensive for an agent: percentages in parentheses,
sizes as text with mixed units, and the detail view is several screens long. To compare
"reclaimable volumes" against "reclaimable images" the agent has to parse `64.9GB` and
`38.1GB (58%)` back into numbers.

#### Structured MCP result

```typescript
docker_resource({ "action": "disk" })
```

```json
{
  "action": "disk",
  "count": 4,
  "total_bytes": 115534368358,
  "disk": [
    { "group": "images", "count": 48, "active": 9,
      "size_bytes": 33500985344, "unused_bytes": 24051816448 },
    { "group": "containers", "count": 21, "active": 7,
      "size_bytes": 1932735283, "unused_bytes": 431994470 },
    { "group": "volumes", "count": 19, "active": 6,
      "size_bytes": 69686362112, "unused_bytes": 40908324864 },
    { "group": "build_cache", "count": 264, "active": 0,
      "size_bytes": 10414285619, "unused_bytes": 10414285619 }
  ],
  "reason": null,
  "legend": {
    "disk[].active": "How many of them something uses right now: a running container, or an image behind one.",
    "disk[].unused_bytes": "Size of what nothing uses at the moment. Removing it frees less than this: what is shared stays until its last holder is gone.",
    "disk[].group=images": "Images are counted by their layers on disk, so this is what they really take; the sizes of separate images add up to more, because a shared layer belongs to each of them.",
    "disk[].group=containers": "Only what a container wrote on top of its image. What the image itself takes is counted with the images."
  }
}
```

#### What changes for the agent

| Raw docker CLI | Structured MCP | Your gain |
|---|---|---|
| Sizes as text with mixed units and percentages | Bytes as numbers, in four named groups | The agent compares instead of parsing |
| The detail view costs several screens | One call, one number per group | Fewer tokens for the same answer |
| "Reclaimable" hides what is holding a volume | `active` counts what is in use, `unused_bytes` what is not | Build cache goes, the database volume stays |

`images`, `volumes` and `networks` list what the host holds — volumes with their size and how
many containers hold them. An empty list means asked and found nothing, which is not the same
as never asked.

## Built-in destructive command protection for AI agents

An AI agent can generate a valid command that is still the wrong command to run. This server adds a
local guard before anything reaches Docker or a database client, so irreversible operations need
an explicit confirmation in the call that requests them.

The guard distinguishes between deleting the thing that holds data — a database, volume, or
top-level directory — and changing or deleting data inside it. The first category is refused
until confirmed. The second can run, but returns a warning that states what changed.

### Block irreversible loss, warn about destructive changes

| Refused — the vessel itself | Only warned about — its contents |
|---|---|
| `DROP DATABASE`, `DROP SCHEMA`, `dropdb` | `DROP TABLE`, `TRUNCATE` |
| `FLUSHALL`, `FLUSHDB` (Redis) | `DELETE FROM` with no `WHERE` |
| `db.dropDatabase()` (MongoDB) | `deleteMany({})`, `updateMany({})` with an empty filter |
| `docker volume rm`, `docker volume prune` | `docker image prune`, `docker container prune` |
| `docker system prune` | `docker network prune` |
| `rm -rf /`, `rm -rf ~`, `rm -rf /srv` | `rm -rf /srv/app/cache` |
| `mkfs`, `dd of=/dev/...` | |

A warning is not a refusal: the operation runs, and what it destroyed is stated as a fact in
the answer's `warnings`. `DELETE FROM orders` with a `WHERE` is not remarked on at all — that is
a normal statement.

Removal reads by where it points. A directory named directly under the root holds all of
something — the application, the data, the system — so `rm -rf /srv` is refused, while
`rm -rf /srv/app/cache` is what deleting files is for. A command wrapped in `sh -c` is unwrapped
and read however many shells it hides behind. The command runs as one argv, so a separator at the
top level is an argument: `echo "hi"; rm -rf /data` prints a line and removes nothing.

### Confirm a deliberate destructive operation

Nothing is forbidden permanently. Three tools take the confirmation, each where the danger is:

```typescript
docker_exec({ "service": "api",
              "command": "rm -rf /srv/legacy # CONFIRMED-DESTRUCTIVE" })

docker_db({ "action": "query", "service": "redis",
            "query": "FLUSHDB # CONFIRMED-DESTRUCTIVE" })

docker_compose_control({ "action": "down", "volumes": true,
                         "confirm": "# CONFIRMED-DESTRUCTIVE" })
```

The marker is carried inside the call, so it lifts the refusal for that one call and no other.
The marker itself never reaches the database or the shell — it is taken out of the statement
before it runs.

Every refusal names what would have gone, so it can be read before the call is repeated rather
than stepped over: `DROP DATABASE shop destroys the database itself. Add # CONFIRMED-DESTRUCTIVE
to the command to run it.`

The guard reads one call at a time. It cannot connect a delete in one call with a read in the
next, and it knows the tools it knows — a custom binary that wipes a directory is not something
it recognizes. It is a seatbelt, not a policy engine: recoverable operations remain your call.

## Docker MCP tools for containers, compose and databases

A focused Docker MCP toolkit for the work AI agents do most often: inspect a Compose stack,
diagnose a service, control its lifecycle, work with its database, and understand host resources.
Full parameters and examples live in **[docs/tools.md](https://github.com/hypnosis/docker-mcp-server/blob/HEAD/docs/tools.md)**.

Every tool speaks the same Docker Compose vocabulary. `profile` selects the Docker host;
`project` selects the Compose project; `service` selects the service from its Compose file, not
the generated container name. Leave `profile` out and the default host answers. Leave `project`
out and the project in the working directory answers. Use `compose_path` only when Docker cannot
resolve a project because it has not run on that host yet.

### Inspect a Docker Compose stack

| Tool | What it does |
|---|---|
| `docker_container` | List a project with state, health and ports, or measure what one service consumes |
| `docker_logs` | Read what a container printed, line by line, in a window bounded by time |
| `docker_compose` | Read what the project declares: the resolved compose file, or its variables |
| `docker_health` | Healthchecks of the services, health of this server, the hosts it was given |
| `docker_resource` | Images, volumes and networks of a host, and where the disk went |

### Control services and stack lifecycle

| Tool | What it does |
|---|---|
| `docker_container_control` | Start, stop or restart one service, reporting where it stood before |
| `docker_compose_control` | Bring the whole stack up or take it down |

### Work with databases running in Docker

| Tool | What it does |
|---|---|
| `docker_db` | Run a statement, or ask the database about itself |
| `docker_db_admin` | Take a dump, or fill a database from one |

PostgreSQL, MySQL/MariaDB, Redis, MongoDB and SQLite are spoken to through the client the image
already carries — nothing is installed into your containers.

### Secrets stay hidden by default

Reading a project's variables with `docker_compose` hides the values whose key names a secret —
anything containing `PASSWORD`, `TOKEN`, `KEY`, `SECRET`, `PRIVATE` or `CREDENTIALS`. Each
variable says whether it was hidden, so a masked value is never mistaken for the real one, and
`mask: false` returns it when you actually need it.

### Run a command when no dedicated tool fits

| Tool | What it does |
|---|---|
| `docker_exec` | Run a command inside a service container, stdout and stderr apart |

### Safe defaults in MCP clients

Standard MCP annotations tell your client which tools are safe to run without asking. The five
reading tools declare `readOnlyHint`. The two control tools declare `destructiveHint` with
`idempotentHint` — the same call twice leaves the same state. `docker_db`, `docker_db_admin` and
`docker_exec` declare `destructiveHint` alone: they carry something the server did not write, so
what happens is decided by what you handed in.

## Set up the Docker MCP server

For local Docker, add the server to your MCP client and start working. No profile file or Docker
endpoint configuration is required: the server uses the Docker socket on this machine.

Configure profiles only when an AI agent needs to reach remote Docker hosts over SSH.

### Configure remote Docker hosts

Store the profiles file wherever your MCP client keeps its configuration. Each profile gives the
agent a name for a Docker host and the SSH connection details it needs:

```json
{
  "default": "local",
  "profiles": {
    "local": { "mode": "local" },
    "production": {
      "host": "prod.example.com",
      "username": "deployer",
      "port": 22,
      "privateKeyPath": "~/.ssh/id_ed25519"
    },
    "staging": {
      "host": "staging.example.com",
      "username": "deployer",
      "port": 2222,
      "privateKeyPath": "~/.ssh/id_ed25519_staging"
    }
  }
}
```

A profile with `mode: "local"` is the Docker on this machine. A remote profile needs `host` and
`username`; `port` defaults to 22. Where the compose projects live on that server is not asked
for: a project is found by the labels its containers carry. `default` names the profile used
when a call leaves `profile` out.

Prefer keys. A profile without `privateKeyPath` uses your SSH agent, which is the better answer
when the key is encrypted.

The host key of the machine is checked: the first connection remembers it in
`~/.ssh/known_hosts`, and a machine that later answers with a different key is refused instead of
being talked to. `knownHostsPath` in a profile points at another file when you keep those keys
apart.

### Configure Claude Code, Codex, Cursor and other MCP clients

**Claude Code** — one command; `-s user` makes the server available in every project:

```bash
claude mcp add docker -s user \
  -e DOCKER_MCP_PROFILES_FILE="$HOME/.claude/docker-profiles.json" \
  -- npx -y @hypnosis/docker-mcp-server
```

**Codex CLI**

```bash
codex mcp add docker \
  --env DOCKER_MCP_PROFILES_FILE="$HOME/.codex/docker-profiles.json" \
  -- npx -y @hypnosis/docker-mcp-server
```

**Cursor** — in `~/.cursor/mcp.json`:

```json
{
  "mcpServers": {
    "docker": {
      "command": "npx",
      "args": ["-y", "@hypnosis/docker-mcp-server"],
      "env": {
        "DOCKER_MCP_PROFILES_FILE": "~/.cursor/docker-profiles.json"
      }
    }
  }
}
```

**opencode** — in `~/.config/opencode/opencode.json`:

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "docker": {
      "type": "local",
      "command": ["npx", "-y", "@hypnosis/docker-mcp-server"],
      "enabled": true,
      "environment": {
        "DOCKER_MCP_PROFILES_FILE": "~/.config/opencode/docker-profiles.json"
      }
    }
  }
}
```

**Other MCP clients** — Gemini CLI, Qwen Code, Cline, an editor plugin or your own agent work
the same way. All they need is a command to run and, for remote hosts, one environment variable.

### Verify the connection

Restart your MCP client, then run `docker_health({ action: "profiles" })`. It lists the Docker
hosts the server received from configuration and identifies any profile it could not read, along
with the field that needs attention.

## Docker MCP server configuration

| Variable | What it does | Default |
|---|---|---|
| `DOCKER_MCP_PROFILES_FILE` | Path to the profiles JSON. Without it, only local Docker | — |
| `DOCKER_PROFILES` | The same JSON inline, used when no profiles file is set | — |
| `DOCKER_MCP_ALLOW_SSH_FALLBACK` | Keep going when a profile's key is missing, instead of refusing | `false` |
| `LOG_LEVEL` | `debug`, `info`, `warn`, `error` | `info` |

`DOCKER_PROFILES_FILE` is the deprecated spelling of the first variable. It still works and logs
a line asking you to rename it.

A profile pointing at a key that does not exist is refused by default, with the path and the
ways out named — a missing key otherwise turns into a connection attempt that fails much later,
somewhere less obvious.

## Docker MCP server limitations

The server favours bounded, explicit tool calls over open-ended or implicit behaviour. These are
the current limits to keep in mind:

- **Log following is bounded.** `follow: true` returns what arrived within 10 seconds or 1 MB,
  whichever comes first. It is a look at a live stream, not a subscription.
- **The guard reads one call at a time.** It cannot connect a delete in one call with a read in
  the next, and it recognizes the tools it knows — a custom binary that wipes a directory is not
  one of them.
- **Host resources are per host, not per project.** `docker_resource` answers about everything
  the daemon holds; narrowing to one project is `docker_container`.
- **Windows is not verified.** Nothing in the server is written against one platform, but it has
  not been run end to end on Windows.

## Develop and test the Docker MCP server

```bash
npm install
npm run build            # tsc
npx tsc --noEmit         # types
npm run test:unit        # unit tests
npm run docker:test:up   # start the test containers
npm run test:e2e         # end-to-end suite against those containers
```

The end-to-end suite runs against real PostgreSQL, MySQL, MariaDB, MongoDB, Redis, and web
service containers. It verifies Docker integration behaviour that unit tests and mocks cannot
prove alone. See [docs/architecture.md](https://github.com/hypnosis/docker-mcp-server/blob/HEAD/docs/architecture.md) for the project layout.

## Support Docker MCP Server

If the tool helps your team, [star the project on GitHub](https://github.com/hypnosis/docker-mcp-server).
It helps other developers find it too.

## Contribute to the Docker MCP server

Issues and pull requests are welcome at
[github.com/hypnosis/docker-mcp-server](https://github.com/hypnosis/docker-mcp-server).

## License

MIT — see [LICENSE](https://github.com/hypnosis/docker-mcp-server/blob/HEAD/LICENSE).