dagster-mcp 0.4.2

MCP server that wraps the Dagster GraphQL API — manage runs, assets, schedules, sensors, and backfills from any MCP client

Dagster MCP

An MCP server that gives AI agents full visibility and control over your Dagster instance — like an SRE for your data pipelines.

Works with any MCP client: Claude Code, Claude Desktop, Cursor, and more.

Why this exists

Data pipelines break at 3 AM. Schedules silently stop firing. Assets go stale. Instead of waking up to a dashboard full of red, give your AI agent the tools to monitor, diagnose, and fix your Dagster instance autonomously.

Agent: Checking instance health...
       get_instance_status() -> healthy: false, daemon "SCHEDULER" unhealthy

Agent: Scheduler daemon is down. Let me check recent failures...
       get_runs(statuses=["FAILURE"], limit=5) -> 3 failed runs in the last hour

Agent: Diagnosing the most recent failure...
       get_run_failure_summary("run_abc123") ->
         failed_steps: ["transform_orders"]
         root_cause: "NullPointerError: column 'price' is null"
         suggestions: ["Single step failed — consider re-running from failure"]

Agent: Re-launching the failed job...
       launch_job("etl_pipeline", "my_project") -> run_id: "run_def456", status: STARTED

What it does

19 tools across 6 categories, designed for autonomous DataOps workflows:

Category	Tools	What an agent can do
Runs	get_runs get_run_status get_run_logs get_run_stats get_run_failure_summary	Find failures, diagnose root causes, inspect logs and step timing
Assets	search_assets get_asset_details get_recent_materializations get_asset_health	Discover assets, check freshness, detect stale data
Jobs	list_jobs	Inventory all jobs across code locations
Schedules & Sensors	list_schedules list_sensors get_tick_history	Detect silent failures, missed ticks, sensor errors
Instance	get_instance_status list_code_locations list_backfills	Global health check, daemon status, code location errors
Actions	launch_job launch_job_with_partitions terminate_run reload_code_location	Re-run failed jobs, backfill partitions, stop stuck runs, reload after deploy

Actions are opt-in: set DAGSTER_READ_ONLY=false to enable write operations.

Quick start

Prerequisites

• Python 3.12+
• uv (recommended) or pip
• A running Dagster instance (self-hosted or Cloud)

Install

The package is published on PyPI.

Option A — run directly with uvx (no install needed):

uvx dagster-mcp

Option B — install with pip:

pip install dagster-mcp

Option C — clone and run:

git clone https://github.com/fabdendev/dagster-mcp.git
cd dagster-mcp
uv sync

Configure

Single environment

Variable	Description	Default
DAGSTER_URL	Base URL of your Dagster instance	http://localhost:3000
DAGSTER_API_TOKEN	Dagster Cloud API token (leave empty for self-hosted)	(empty)
DAGSTER_EXTRA_HEADERS	JSON object of additional request headers sent to Dagster GraphQL	(empty)
DAGSTER_READ_ONLY	When true, only read tools are exposed (no launch/terminate/reload)	true

Self-hosted:

export DAGSTER_URL=http://localhost:3000

Dagster Cloud:

export DAGSTER_URL=https://myorg.dagster.cloud/prod
export DAGSTER_API_TOKEN=your-dagster-cloud-user-token

Custom auth / proxy headers:

export DAGSTER_EXTRA_HEADERS='{"Authorization":"Bearer your-token","X-My-Header":"value"}'

Multiple environments

Use DAGSTER_ENVS to configure several Dagster instances in one server. Every tool then accepts an optional env parameter so the LLM can target the right instance.

Variable	Description	Default
DAGSTER_ENVS	JSON object mapping env names to {url, token?, extra_headers?} configs	(empty)
DAGSTER_DEFAULT_ENV	Env name to use when env is not passed to a tool	(empty)

export DAGSTER_ENVS='{
  "prod": {"url": "https://myorg.dagster.cloud/prod", "token": "prod-token"},
  "staging": {"url": "https://myorg.dagster.cloud/staging", "token": "stg-token"},
  "dev": {"url": "http://localhost:3000"}
}'
export DAGSTER_DEFAULT_ENV=prod

When DAGSTER_ENVS is set, DAGSTER_URL / DAGSTER_API_TOKEN / DAGSTER_EXTRA_HEADERS are ignored. If only one env is defined, it is used automatically even without DAGSTER_DEFAULT_ENV.

Add to your MCP client

Claude Code

Add to ~/.claude/settings.json:

Single env:

{
  "mcpServers": {
    "dagster": {
      "command": "uvx",
      "args": ["dagster-mcp"],
      "env": {
        "DAGSTER_URL": "http://localhost:3000"
      }
    }
  }
}

Multiple envs:

{
  "mcpServers": {
    "dagster": {
      "command": "uvx",
      "args": ["dagster-mcp"],
      "env": {
        "DAGSTER_ENVS": "{\"prod\":{\"url\":\"https://myorg.dagster.cloud/prod\",\"token\":\"prod-token\"},\"dev\":{\"url\":\"http://localhost:3000\"}}",
        "DAGSTER_DEFAULT_ENV": "prod"
      }
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "dagster": {
      "command": "uvx",
      "args": ["dagster-mcp"],
      "env": {
        "DAGSTER_URL": "http://localhost:3000"
      }
    }
  }
}

From a local clone

{
  "mcpServers": {
    "dagster": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/dagster-mcp", "dagster-mcp"],
      "env": {
        "DAGSTER_URL": "http://localhost:3000"
      }
    }
  }
}

Tool reference

Runs

Tool	Description
get_runs	List recent runs, filter by job name and/or status
get_run_status	Get status, config, tags, and run lineage (re-execution chain via rootRunId/parentRunId)
get_run_logs	Get structured log events with pagination and optional level filtering (ERROR, WARNING, INFO)
get_run_stats	Get per-step execution stats: timing, materializations, expectation results
get_run_failure_summary	Consolidated failure diagnosis — failed steps, root cause error, step durations, and suggestions in one call

Assets

Tool	Description
search_assets	Discover assets by key prefix or group name
get_asset_details	Get description, upstream/downstream dependencies, partitions, latest materialization
get_recent_materializations	Get materialization history with metadata for an asset
get_asset_health	Consolidated health view — staleness, freshness policy, last run status (works with single asset or entire group)

Jobs, Schedules & Sensors

Tool	Description
list_jobs	List all jobs across all code locations (use to find names for launch_job)
list_schedules	List schedules with status (RUNNING/STOPPED), cron, target job, next tick
list_sensors	List sensors with status and target jobs
get_tick_history	Tick-by-tick history for a schedule or sensor — essential for detecting silent failures

Instance & Code Locations

Tool	Description
get_instance_status	Start here — global health: daemon status, queued run count, code location errors
list_code_locations	List all code locations and their load status
list_backfills	List recent backfills with status and partition progress

Write Operations

Tool	Description
launch_job	Launch a job or materialize specific assets (supports tags and asset selection)
launch_job_with_partitions	Launch a partitioned job for one or more partition keys; creates a backfill (supports from_failure to retry only failed steps)
terminate_run	Stop a stuck or runaway run
reload_code_location	Reload a code location after deploy

Write tools require DAGSTER_READ_ONLY=false (default is true).

How it differs from the official Dagster MCP

	dagster-mcp (this project)	dg[mcp] (official)
Purpose	Monitor and operate a running instance	Write Dagster code and scaffold components
When	Operations time	Development time
What it does	Inspect runs, read logs, check assets, launch jobs	Generate definitions, use dg CLI, build pipelines

They serve different purposes and work well together.

Compatibility

Tested with Dagster 1.6+. The RunsFilter field name (jobName vs pipelineName) is auto-detected via schema introspection, so the server works across all Dagster versions without configuration.

Development

uv sync --extra dev
uv run ruff check dagster_mcp/    # lint
uv run pytest                     # tests (98 tests)
uv run python -m dagster_mcp      # start server locally

License

MIT