Dbt Doctor

---

Project status

Active alpha. Snapshot date: 2025-12-25. See STATUS.md and KNOWN_LIMITATIONS.md for what is working today, what is planned, and what is not claimed.

What is dbt-doctor?

dbt-doctor is a Model Context Protocol (MCP) server that provides your AI coding assistant with deep context regarding your dbt project's health. Instead of manually running CLI commands and analyzing outputs, you can interact with your AI:

• "What's the overall health of my dbt project?"
• "Profile the fct_orders model and suggest appropriate tests."
• "Auto-document the models that have the lowest test coverage."

The tool handles the heavy operations—reading the manifest, profiling your data warehouse, detecting schema drift, and writing back to schema.yml files—without requiring you to leave the chat.

Note: This tool is designed to complement the official dbt-labs/dbt-mcp. While dbt-labs/dbt-mcp focuses on running dbt commands, dbt-doctor focuses on auditing, profiling, and documentation.

Key Features

Project Auditing

Evaluate your project with a 0–100% score based on documentation, testing, and naming conventions. Access a ranked list of models lacking coverage to prioritize your efforts.

Data Profiling

Perform efficient single-pass column statistics—including NULL rates, cardinality, min/max values, and uniqueness—using one batched SQL query per table to avoid slow row-by-row scanning.

Schema Drift Detection

Compare the current state of your data warehouse against the definitions in your manifest.json. Instantly identify added, removed, or type-changed columns.

Intelligent Test Suggestions

Translate profiling statistics into actionable dbt test recommendations. For example, a uniquely populated column without nulls will prompt suggestions for not_null and unique tests, while low cardinality will suggest accepted_values with predefined options.

Non-Destructive YAML Writing

Update schema.yml files using ruamel.yaml to retain hand-written comments, existing tests, and formatting. The tool only appends missing information and preserves your manual configurations.

End-to-End Documentation Generation

Execute a complete workflow in a single conversational turn: profile a model, suggest tests, preview changes, and write to schema.yml.

---

Included MCP Tools

Category	Tool	Description
Context	list_models	Overview of all models and their coverage status
Context	get_model_details	Detailed model information including SQL, columns, lineage, and tests
Audit	audit_project	Project health score and naming convention violations
Audit	check_test_coverage	Models ranked by their test coverage percentage
Audit	analyze_dag	Detection of orphan models and high fan-out nodes
Audit	get_project_health	Single-call dashboard summarizing project status
Profiling	profile_model	Batched column statistics
Profiling	execute_query	Read-only SQL execution against your warehouse
Profiling	detect_schema_drift	Comparison of database columns against manifest definitions
Generation	suggest_tests	Translation of profile data into dbt test recommendations
Generation	update_model_yaml	Safe merging of documentation and tests to schema.yml
Generation	generate_model_docs	Complete end-to-end documentation workflow

---

Quick Start

Installation

pip install dbt-doctor

Configuration (Claude Desktop)

Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "dbt-doctor": {
      "command": "dbt-doctor",
      "args": ["--project-dir", "/absolute/path/to/your/dbt/project"]
    }
  }
}

Configuration (Cursor)

Add the following to your .cursor/mcp.json:

{
  "mcpServers": {
    "dbt-doctor": {
      "command": "dbt-doctor",
      "args": ["--project-dir", "/absolute/path/to/your/dbt/project"]
    }
  }
}

Prerequisite: Run dbt compile prior to usage to ensure target/manifest.json is available for dbt-doctor to parse.

---

Architecture

The application connects the AI Assistant with your dbt project and database through the MCP protocol. It features a read-only analysis layer combined with a secure generation toolkit that merges changes seamlessly into your existing YAML schemas.

---

Security Design

• Read-only execution: All execute_query operations operate within a read-only transaction. Write processes are restricted at the database connector level.
• SQL validation: Table and column identifiers are strictly validated against a whitelist to prevent injection.
• Stateless connections: Data warehouse credentials are instantiated per connection and are never cached in memory.
• Preview before commit: The document generation process provides a difference preview prior to rewriting schema.yml, ensuring you retain control over modifications.

---

Related Projects

Project	Description
dbt-labs/dbt-mcp	Official MCP focused on dbt command execution
dbt-coverage	CLI tool for coverage reporting without AI integration
dbt-project-evaluator	dbt package for project evaluation, requiring installation per project

dbt-doctor uniquely consolidates auditing, profiling, drift detection, and AI-driven YAML updates into a single server interface.

---

License

MIT — see the LICENSE file.