Manage CockroachDB with Natural Language
MCP server that lets LLM agents monitor, query and administer CockroachDB in natural language, with read-only mode and confirmed destructive operations.
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Why it matters
Enable AI agents and LLMs to interact with CockroachDB databases using natural language for comprehensive management, monitoring, and querying.
Outcomes
What it gets done
Execute natural language queries and transactions against CockroachDB.
Monitor cluster health, node status, and replication.
Perform database operations like creation, deletion, and switching.
Manage tables, including creation, deletion, and schema description.
Install
Add it to your toolbox
Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.
Run in your project directory:
curl -fsSL https://spark.entire.vc/get/vb-cockroachdb | bash After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.
Reports
Agent outcome reports
No reports yet
Capabilities
Tools your agent gets
Get cluster health and node status
Show currently running queries
Analyze query performance statistics
Get replication and distribution status for tables or database
Connect to a CockroachDB database
List available databases
Create new databases
Drop databases
Overview
The CockroachDB MCP Server is a natural language interface for LLMs and agentic applications to manage, monitor and query data in CockroachDB. It exposes thirteen tool categories through a FastMCP server and an asyncpg connection pool, and works with MCP clients such as Claude Desktop and Cursor. Use it when an MCP client or agent should inspect, query or administer CockroachDB directly. Run it with --read-only for assistant-style use, and enable --allow-destructive only for administrative agents that manage schema.
What it does
The CockroachDB MCP Server is a natural language interface for LLMs and agentic applications to manage, monitor and query data in CockroachDB. It integrates with MCP clients such as Claude Desktop or Cursor, so AI-driven workflows can interact with the database directly.
A request flows from an MCP client through a transport (stdio by default, or streamable HTTP), into a safety layer, then to one of thirteen tool categories, and finally to CockroachDB through an asyncpg connection pool. The server runs on FastMCP and works against a single-region or multi-region cluster.
The safety design assumes an LLM-driven agent, where a prompt-injection attack could turn into SQL injection or data destruction. Three layers defend against that. Identifier validation checks every database, schema, table, column, index and view name against ^[A-Za-z_][A-Za-z0-9_]{0,62}$ before it reaches SQL. Values are always parameterized with asyncpg placeholders, so no user-controlled value is interpolated into SQL. Server-level policy uses --read-only to disable every DDL and write-shaped tool, --allow-destructive to unlock the drop_* tools, and a required confirm=True on each destructive call even then. DSNs are redacted in responses, and passwords never appear in connect() results.
When to use - and when NOT to
Use it when an agent or MCP client needs to observe, query or administer CockroachDB. For production assistant-style use, run with --read-only. For administrative agents that manage schema, set --allow-destructive, and never disable the confirm=True requirement.
It also lets you run the agent under a scoped non-root user: an administrative agent can provision that user through the user and privilege tools.
One limit applies to node lifecycle. SQL-initiated decommission only marks intent, so use the cockroach node CLI for the full lifecycle.
Capabilities
- Cluster Monitoring: cluster health and node status, running queries, query performance statistics, replication and distribution status, query and transaction execution insights, slow queries, contention events and index recommendations.
- Database Operations: connect, list, create, drop and switch databases, connection status and active sessions, database settings.
- Table Management: create, drop, describe, rename and truncate tables; add, drop and rename columns; bulk import of CSV or Avro from s3, gs, azure or http(s); indexes, views and schemas; table relationships.
- Query Engine: SQL with JSON, CSV or table output, multi-statement transactions, query plan explanation and query history.
- User and Privilege Management: create and drop users and roles, change passwords, grant and revoke roles and privileges, show grants.
- Vector Search:
vector_similarity_searchwith ametricofcosine(the default and safest, since it ignores magnitude),l2,iporauto(matches the index opclass), pluscreate_cspann_indexanddrop_cspann_indexfor C-SPANN indexes. This needs CockroachDB v25.2 or later. - Job Management: list jobs by status and type, get job status, pause, resume and cancel BACKUP, RESTORE, IMPORT, SCHEMA CHANGE and CHANGEFEED jobs.
- Backup and Restore:
create_backupto s3, gs, azure, nodelocal or userfile,list_backups,restore_backupwith an optionalnew_db_name, andlist_scheduled_backups. - Statistics:
create_statisticsandshow_statistics. - Multi-Region: regions, survival goals (
ZONEorREGION), table locality (REGIONAL,REGIONAL_BY_ROW,REGIONAL_BY_TABLE,GLOBAL) and zone configuration. - Changefeeds: CDC pipelines to Kafka, webhooks or cloud storage with sink-scheme validation, JSON or Avro format and a choice of envelope.
- Cluster Admin: show, set and reset cluster settings, decommission and drain nodes.
- Diagnostics: recent traces, statement-diagnostics requests and bundles.
Detail on the tools. Privileges passed to grant_privileges and revoke_privileges are validated against an allowlist (SELECT, INSERT, UPDATE, DELETE, ALL, BACKUP, RESTORE, MODIFYCLUSTERSETTING and more), and identifiers go through the same strict regex as everywhere else. Vector search always passes the query vector as a $1::VECTOR parameter and validates the identifier and any where clause; create_cspann_index maps metric to opclass (vector_cosine_ops, vector_l2_ops, vector_ip_ops) and, for normalized embeddings such as OpenAI text-embedding-3, all three metrics rank identically. Backup URI schemes are validated against an allowlist, and create_changefeed validates the sink scheme (Kafka, webhook over http(s), s3, gs, azure-blob, external or null). get_recent_traces reads crdb_internal.cluster_inflight_traces, and request_statement_diagnostics takes a statement fingerprint. Setting names for cluster settings are validated against a strict regex, and reset_cluster_setting is destructive.
Command-line options: --url (a connection URI), --host, --port (default 26257), --db (default defaultdb), --username (default root), --password, --ssl-mode (disable by default, then allow, prefer, require, verify-ca, verify-full), --ssl-key, --ssl-cert, --ssl-ca-cert, --transport (stdio or http), --http-host, --http-port, --http-path (for example /mcp), --stateless-http, --use-env, --read-only, --allow-destructive (required for drop_database, drop_table, drop_index and drop_view, and every call still needs confirm=True) and --version. An SSL connection can be given as a URI with sslmode=verify-full plus sslrootcert, sslcert and sslkey parameters. A .env file created with cp .env.example .env supplies environment variables.
Beyond the four drop_* tools, restore_backup, cancel_job, drop_cspann_index, drop_database_region, cancel_changefeed and reset_cluster_setting are also marked destructive.
How to install
It needs Python 3.12 or newer. The fastest way is uvx, which runs the server straight from GitHub. Pin a tagged release:
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git@0.1.0 cockroachdb-mcp-server --url postgresql://localhost:26257/defaultdb
Other routes are a development install with uv sync, Docker (build the provided Dockerfile or use the mcp/cockroachdb image), Docker Compose for a local CockroachDB plus MCP server, and an MCPB bundle for Claude Desktop or Smithery. The MCPB manifest declares six user_config fields: url (marked sensitive so the client keeps it in the OS keychain), read_only (default true), allow_destructive (default false) and optional SSL CA certificate, certificate and key pickers.
Configuration precedence is CLI arguments, then environment variables, then defaults. The environment defaults are CRDB_HOST 127.0.0.1, CRDB_PORT 26257, CRDB_DATABASE defaultdb, CRDB_USERNAME root and CRDB_SSL_MODE disable, with CRDB_SSL_CA_PATH, CRDB_SSL_CERTFILE, CRDB_SSL_KEYFILE and CRDB_PWD unset. Pool tuning uses CRDB_POOL_MIN (1), CRDB_POOL_MAX (10) and CRDB_COMMAND_TIMEOUT (60 seconds). Logging uses MCP_LOG_LEVEL (default INFO) and MCP_LOG_JSON=1, recommended with the HTTP transport. Streamable HTTP mode (flags above) supports stateless horizontal scaling via --stateless-http.
Client setups: Claude Desktop uses the full path to uvx in claude_desktop_config.json. VS Code with GitHub Copilot needs agent mode enabled with "chat.agent.enabled": true. Augment imports a JSON entry (the entry shown passes --read-only). Cursor installs through a one-click link. The OpenAI Agents SDK needs pip install openai-agents and an OPENAI_API_KEY. The MCP Inspector runs with npx @modelcontextprotocol/inspector uv run src/main.py.
Docker Compose (docker compose up -d) starts CockroachDB and the MCP server for local development, with the server at http://localhost:8000/mcp/ and the CockroachDB UI at http://localhost:8080. The official image mcp/cockroachdb replaces a locally built mcp-cockroachdb image in a Docker-based client entry that passes CRDB_HOST, CRDB_PORT, CRDB_DATABASE and CRDB_USERNAME. Building the MCPB bundle uses npm install -g @anthropic-ai/mcpb, copying mcpb/manifest.json to the project root and running mcpb pack . cockroachdb-mcp-server.mcpb; double-clicking the file in Claude Desktop shows a configuration form, and smithery mcp publish publishes it. For the development install the Claude Desktop entry points command at the full path to uv (from which uv) and runs src/main.py with CRDB_HOST, CRDB_PORT, CRDB_DATABASE, CRDB_USERNAME, CRDB_PWD, CRDB_SSL_MODE and the SSL path variables; tail -f ~/Library/Logs/Claude/mcp-server-cockroach.log follows the log.
The server is MIT licensed.
Source README
CockroachDB MCP Server
Overview
The CockroachDB MCP Server is a natural language interface designed for LLMs and agentic applications to manage, monitor, and query data in CockroachDB. It integrates seamlessly with MCP (Model Content Protocol) clients, such as Claude Desktop or Cursor, enabling AI-driven workflows to interact directly with your database.
Table of Contents
- Overview
- Features
- Tools
- Installation
- Configuration
- Integrations
- Testing
- Contributing
- License
- Quality Badge
- Contact
Features
- Natural-Language Queries: AI agents can query and transact via natural language.
- Cluster Monitoring: Cluster status, node health, replication, slow queries, contention, index recommendations.
- Database Operations: List, create, drop, and switch databases.
- Table Management: Create, drop, alter (add/drop/rename column), truncate, rename, describe; bulk-import; indexes, views, schemas.
- Query Engine: Parameterized SQL with json/csv/table output, multi-statement transactions, explain, history.
- User & Privilege Management: Provision SQL users and roles, grant/revoke privileges. Lets you run the agent under a scoped non-root user.
- Vector Search: Similarity search with cosine/L2/inner-product metrics (auto-detected from index opclass), C-SPANN ANN index management (v25.2+).
- Job Management: Observe and control async jobs (BACKUP, RESTORE, IMPORT, CHANGEFEED, SCHEMA CHANGE).
- Backup & Restore: Full / database / table backup and restore against s3, gs, azure, nodelocal, userfile.
- Statistics: Create and show optimizer statistics.
- Multi-Region: Regions, survival goals, locality (REGIONAL_BY_ROW etc.), zone configuration.
- Changefeeds: CDC pipelines to Kafka / webhook / cloud-storage with sink-scheme validation.
- Cluster Admin: Cluster settings, decommission/drain (gated).
- Diagnostics: Tracing spans, statement-diagnostics bundles.
- Safety First: Strict identifier validation, parameterized values,
--read-onlymode, explicitconfirm=Truefor destructive ops, redacted DSN responses. - Seamless MCP Integration: Works with any MCP client (Claude Desktop, Cursor, VS Code Copilot, OpenAI Agents SDK, etc.).
- Multiple Transports: stdio (default) and streamable HTTP.
Tools
The CockroachDB MCP Server exposes CockroachDB as a set of MCP tools. Requests flow from any MCP client through a transport, into the safety layer, then to one of the thirteen tool categories, and finally to CockroachDB via an asyncpg connection pool.
flowchart LR
subgraph Clients["MCP Clients"]
direction TB
C1["Claude Desktop"]
C2["Cursor"]
C3["VS Code Copilot"]
C4["OpenAI Agents SDK"]
C5["Augment"]
end
subgraph Transport["Transport"]
direction TB
T1["stdio"]
T2["streamable HTTP"]
end
subgraph Server["CockroachDB MCP Server (FastMCP)"]
direction TB
subgraph Safety["Safety Layer"]
direction TB
S1["Identifier validation<br/>(strict regex)"]
S2["Parameterized values<br/>($1, $2, ...)"]
S3["--read-only gate"]
S4["--allow-destructive<br/>+ confirm=True"]
S5["DSN redaction"]
end
subgraph Tools["Tool Categories (13)"]
direction TB
subgraph Obs["Observe & Diagnose"]
O1["Cluster Monitoring"]
O2["Diagnostics"]
O3["Statistics"]
end
subgraph Data["Data & Schema"]
D1["Database Operations"]
D2["Table Management"]
D3["Query Engine"]
D4["Vector Search (C-SPANN)"]
end
subgraph Ops["Data Movement"]
P1["Job Management"]
P2["Backup & Restore"]
P3["Changefeeds (CDC)"]
end
subgraph Adm["Admin & Topology"]
A1["User & Privilege Management"]
A2["Multi-Region"]
A3["Cluster Admin"]
end
end
Pool["asyncpg connection pool"]
end
DB[("CockroachDB<br/>single- or multi-region cluster")]
Clients --> Transport
Transport --> Safety
Safety --> Tools
Tools --> Pool
Pool --> DB
The tools are organized into thirteen categories, grouped above by concern. Every write-shaped tool is gated by --read-only. Every destructive tool also requires --allow-destructive plus a per-call confirm=True parameter; see the Safety Model section.
Cluster Monitoring
Purpose: Provides tools for monitoring and managing CockroachDB clusters.
Summary:
- Get cluster health and node status.
- Show currently running queries.
- Analyze query performance statistics.
- Retrieve replication and distribution status for tables or the whole database.
- Get query execution insights with optional keyword filtering.
- Find slow queries from statement statistics with optional keyword filtering.
- Get transaction execution insights with optional keyword filtering.
- View contention events with optional table filtering.
- Get index recommendations from query insights.
Database Operations
Purpose: Handles database-level operations and connection management.
Summary:
- Connect to a CockroachDB database.
- List, create, drop, and switch databases.
- Get connection status and active sessions.
- Retrieve database settings.
Table Management
Purpose: Provides tools for managing tables, indexes, views, schemas, and relationships in CockroachDB.
Summary:
- Create, drop, describe, rename, and truncate tables (destructive ops gated).
alter_table_add_column,alter_table_drop_column,alter_table_rename_column.- Bulk import data into tables (CSV / Avro from s3/gs/azure/http(s)).
- Manage indexes (create/drop).
- Manage views (create/drop, list).
- Manage schemas (
list_schemas,create_schema,drop_schema). - List tables and table relationships; analyze schema structure and metadata.
Query Engine
Purpose: Executes and manages SQL queries and transactions.
Summary:
- Execute SQL queries with formatting options (JSON, CSV, table).
- Run multi-statement transactions.
- Explain query plans for optimization.
- Track and retrieve query history.
User & Privilege Management
Purpose: Manage SQL users, roles, and privileges. Use this from an administrative agent to provision the agent's own scoped (non-root) user.
Summary:
list_users,create_user,drop_user,alter_user_password.create_role,drop_role,grant_role,revoke_role.show_grants,grant_privileges,revoke_privileges.
Privileges are validated against an allowlist (SELECT, INSERT, UPDATE,
DELETE, ALL, BACKUP, RESTORE, MODIFYCLUSTERSETTING, ...). Identifiers
go through the same strict regex as everywhere else.
Vector Search
Purpose: Search VECTOR columns with CockroachDB's similarity operators (v25.2+) and manage C-SPANN ANN indexes.
Summary:
vector_similarity_searchwithmetricofcosine(default),l2,ip, orauto(matches the existing index opclass). Returnsdistanceand a derivedsimilarityfield.create_cspann_indexwith metric → opclass mapping (vector_cosine_ops/vector_l2_ops/vector_ip_ops).drop_cspann_index(destructive).
The query vector is always passed as a $1::VECTOR parameter; identifier and
optional where clause values are validated. For normalized embeddings (e.g.
Takara DS1, OpenAI text-embedding-3) all three metrics rank identically; the
default cosine is the safest because it ignores magnitude.
Job Management
Purpose: Observe and control long-running CockroachDB jobs (BACKUP, RESTORE, IMPORT, SCHEMA CHANGE, CHANGEFEED).
Summary:
list_jobs(filter by status and type),get_job_status.pause_job,resume_job,cancel_job(destructive).
Backup & Restore
Purpose: Take and restore cluster, database, and table backups.
Summary:
create_backupto s3/gs/azure/nodelocal/userfile destinations.list_backupsto enumerate backups at a storage URI.restore_backup(destructive) with optionalnew_db_name.list_scheduled_backups.
URI schemes are validated against an allowlist; identifier targets are identifier-validated.
Statistics
Purpose: Compute and inspect the table statistics the cost-based optimizer relies on.
Summary:
create_statistics(CREATE STATISTICS).show_statistics(SHOW STATISTICS FOR TABLE).
Multi-Region
Purpose: Configure multi-region behaviour: regions, survival goals, table localities, zone configurations.
Summary:
show_regions,show_database_regions.add_database_region,drop_database_region(destructive).set_survival_goal(ZONEorREGION).set_table_locality(REGIONAL,REGIONAL_BY_ROW,REGIONAL_BY_TABLE,GLOBAL).show_zone_configfor DATABASE/TABLE/INDEX.
Changefeeds
Purpose: Set up and operate CDC pipelines to Kafka, webhooks, or cloud storage.
Summary:
create_changefeedwith sink-scheme validation (kafka, webhook-http(s), s3, gs, azure-blob, external, null), JSON or Avro format, choice of envelope.list_changefeeds,pause_changefeed,resume_changefeed.cancel_changefeed(destructive).
Cluster Admin
Purpose: Cluster-wide administration: cluster settings and node lifecycle.
Summary:
show_cluster_setting,set_cluster_setting,reset_cluster_setting(destructive). Setting names are validated against a strict regex.decommission_node,drain_node. Note that SQL-initiated decommission only marks intent; for the full lifecycle use thecockroach nodeCLI.
Diagnostics
Purpose: Inspect tracing spans and request statement-diagnostics bundles.
Summary:
get_recent_tracesfromcrdb_internal.cluster_inflight_traces.list_statement_diagnostics_requests.request_statement_diagnosticsfor a statement fingerprint.
Installation
The CockroachDB MCP Server supports the stdio transport and the streamable-http transport.
Quick Start with uvx
The easiest way to use the CockroachDB MCP Server is with uvx, which allows you to run it directly from GitHub (from a branch, or use a tagged release). It is recommended to use a tagged release. The main branch is under active development and may contain breaking changes. As an example, you can execute the following command to run the 0.1.0 release:
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git@0.1.0 cockroachdb-mcp-server --url postgresql://localhost:26257/defaultdb
Check the release notes for the latest version in the Releases section. Additional examples are provided below.
# Run with CockroachDB URI
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server --url postgresql://localhost:26257/defaultdb
# Run with individual parameters
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server --host localhost --port 26257 --database defaultdb --user root --password mypassword
# See all options
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server --help
# Run with streamable HTTP transport
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server \
--url postgresql://localhost:26257/defaultdb \
--transport http \
--http-host 0.0.0.0 \
--http-port 8000 \
--http-path /mcp
Development Installation
For development or if you prefer to clone the repository:
# Clone the repository
git clone https://github.com/amineelkouhen/mcp-cockroachdb.git
cd mcp-cockroachdb
# Install dependencies using uv
uv venv
source .venv/bin/activate
uv sync
# Run with CLI interface
uv run cockroachdb-mcp-server --help
# Or run the main file directly (uses environment variables)
uv run src/main.py
Once you cloned the repository, installed the dependencies and verified you can run the server, you can configure Claude Desktop or any other MCP Client to use this MCP Server running the main file directly (it uses environment variables). This is usually preferred for development. The following example is for Claude Desktop, but the same applies to any other MCP Client.
- Specify your CockroachDB credentials and TLS configuration
- Retrieve your
uvcommand full path (e.g.which uv) - Edit the
claude_desktop_config.jsonconfiguration file - on a MacOS, at~/Library/Application Support/Claude/
{
"mcpServers": {
"cockroach": {
"command": "<full_path_uv_command>",
"args": [
"--directory",
"<your_mcp_server_directory>",
"run",
"src/main.py"
],
"env": {
"CRDB_HOST": "<your_cockroachdb_hostname>",
"CRDB_PORT": "<your_cockroachdb_port>",
"CRDB_DATABASE": "<your_cockroach_database>",
"CRDB_USERNAME": "<your_cockroachdb_user>",
"CRDB_PWD": "<your_cockroachdb_password>",
"CRDB_SSL_MODE": "disable|allow|prefer|require|verify-ca|verify-full",
"CRDB_SSL_CA_PATH": "<your_cockroachdb_ca_path>",
"CRDB_SSL_KEYFILE": "<your_cockroachdb_keyfile_path>",
"CRDB_SSL_CERTFILE": "<your_cockroachdb_certificate_path>",
}
}
}
}
You can troubleshoot problems by tailing the log file.
tail -f ~/Library/Logs/Claude/mcp-server-cockroach.log
With Docker Compose (Local Development)
For local development and testing, use the provided docker-compose.yaml to spin up both CockroachDB and the MCP server:
# Start CockroachDB and MCP server
docker compose up -d
# The MCP server is available at http://localhost:8000/mcp/
# CockroachDB UI is available at http://localhost:8080
# View logs
docker compose logs -f mcp-server
# Stop and clean up
docker compose down -v
With Docker
You can use a dockerized deployment of this server. You can either build your image or use the official CockroachDB MCP Docker image.
If you'd like to build your image, the CockroachDB MCP Server provides a Dockerfile. Build this server's image with:
docker build -t mcp-cockroachdb .
Finally, configure the client to create the container at start-up. An example for Claude Desktop is provided below. Edit the claude_desktop_config.json and add:
{
"mcpServers": {
"cockroach": {
"command": "docker",
"args": ["run",
"--rm",
"--name",
"cockroachdb-mcp-server",
"-e", "CRDB_HOST=<cockroachdb_host>",
"-e", "CRDB_PORT=<cockroachdb_port>",
"-e", "CRDB_DATABASE=<cockroachdb_database>",
"-e", "CRDB_USERNAME=<cockroachdb_user>",
"mcp-cockroachdb"]
}
}
}
To use the CockroachDB MCP Docker image, just replace your image name (mcp-cockroachdb in the example above) with mcp/cockroachdb.
As an MCPB Bundle (Smithery / Claude Desktop)
The repository ships an MCPB manifest under mcpb/manifest.json. MCPB (.mcpb) is a single-file archive that clients like Claude Desktop and catalogs like Smithery can install as a local stdio server, prompting the user for connection details via a UI instead of hand-editing JSON.
The manifest declares six user_config fields: url (marked sensitive, so the client stores it in the OS keychain rather than plaintext config), read_only (default true), allow_destructive (default false), and optional ssl_ca_cert / ssl_cert / ssl_key file pickers. Values are passed to the server via env vars (CRDB_URL, MCP_READ_ONLY, MCP_ALLOW_DESTRUCTIVE, CRDB_SSL_*).
Build the bundle:
npm install -g @anthropic-ai/mcpb
cp mcpb/manifest.json ./manifest.json
mcpb pack . cockroachdb-mcp-server.mcpb
Install locally in Claude Desktop: double-click the resulting .mcpb file. Claude Desktop will show the config form built from user_config.
Publish to Smithery:
smithery mcp publish ./cockroachdb-mcp-server.mcpb -n amineelkouhen/cockroachdb-mcp-server
Configuration
The CockroachDB MCP Server can be configured in two ways: either via command-line arguments or via environment variables. The precedence is: CLI arguments > environment variables > default values.
Configuration via command line arguments
When using the CLI interface, you can configure the server with command line arguments:
# Basic CockroachDB connection
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server \
--host localhost \
--port 26257 \
--db defaultdb \
--user root \
--password mypassword
# Using CockroachDB URI (simpler)
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server \
--url postgresql://root@localhost:26257/defaultdb
# SSL connection
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server \
--url postgresql://user:pass@cockroach.example.com:26257/defaultdb?sslmode=verify-full&sslrootcert=path/to/ca.crt&sslcert=path/to/client.username.crt&sslkey=path/to/client.username.key
# See all available options
uvx --from git+https://github.com/amineelkouhen/mcp-cockroachdb.git cockroachdb-mcp-server --help
Available CLI Options:
--url- CockroachDB connection URI (postgresql://user:pass@host:port/db)--host- CockroachDB hostname--port- CockroachDB port (default: 26257)--db- CockroachDB database name (default: defaultdb)--username- CockroachDB username (default: root)--password- CockroachDB password--ssl-mode- SSL mode - Possible values: disable (default), allow, prefer, require, verify-ca, verify-full--ssl-key- Path to SSL client key file--ssl-cert- Path to SSL client certificate file--ssl-ca-cert- Path to CA (root) certificate file--transport- MCP transport to use (stdioorhttp)--http-host- HTTP host to bind for streamable HTTP transport--http-port- HTTP port to bind for streamable HTTP transport--http-path- HTTP path for streamable HTTP transport (e.g.,/mcp)--stateless-http- Enable stateless HTTP mode for horizontal scaling--use-env- Use environment variables for CockroachDB configuration--read-only- Refuse all DDL and write tools; recommended for assistant-style deployments--allow-destructive- Required fordrop_database,drop_table,drop_index,drop_view. Even with this flag, every destructive call must includeconfirm=True.--version- Show the server version and exit
Safety Model
This server is designed for use with an LLM-driven agent, where a prompt-injection attack on the agent could turn into SQL injection or data destruction. Three layers of defense are built in:
- Identifier validation. All database, schema, table, column, index, and view names are validated against
^[A-Za-z_][A-Za-z0-9_]{0,62}$before being interpolated into SQL. - Values are always parameterized. Filters, limits, and intervals use asyncpg placeholders (
$1,$2, ...). No user-controlled value is interpolated into SQL. - Server-level policy.
--read-onlydisables every DDL and write-shaped tool (drop_*,create_*,execute_queryof INSERT/UPDATE/etc.,bulk_import, ...).--allow-destructiveis required fordrop_*tools. Even then, the caller must passconfirm=Trueper call.- DSNs are redacted in responses; passwords never appear in
connect()results.
Recommended defaults for production assistant-style use: --read-only. For administrative agents that need to manage schema, set --allow-destructive but never disable the confirm=True requirement.
Logging
Logging is configured via environment variables:
MCP_LOG_LEVEL(defaultINFO) - standard Python logging level (DEBUG/INFO/WARNING/ERROR).MCP_LOG_JSON=1- emit JSON-structured log lines, recommended when running with--transport http.
Connection pool tuning
CRDB_POOL_MIN(default1)CRDB_POOL_MAX(default10)CRDB_COMMAND_TIMEOUT(default60seconds)
Configuration via Environment Variables
If desired, you can use environment variables. Defaults are provided for all variables.
| Name | Description | Default Value |
|---|---|---|
CRDB_HOST |
The host name or address of a CockroachDB node or load balancer. | 127.0.0.1 |
CRDB_PORT |
The port number of the SQL interface of the CockroachDB node or load balancer. | 26257 |
CRDB_DATABASE |
A database name to use as the current database. | defaultdb |
CRDB_USERNAME |
The SQL user that will own the client session. | root |
CRDB_PWD |
The user's password. | None |
CRDB_SSL_MODE |
Which type of secure connection to use. | disable |
CRDB_SSL_CA_PATH |
Path to the CA certificate, when sslmode is not disable. |
None |
CRDB_SSL_CERTFILE |
Path to the client certificate, when sslmode is not disable. |
None |
CRDB_SSL_KEYFILE |
Path to the client private key, when sslmode is not disable. |
None |
There are several ways to set environment variables:
- Using a
.envFile: Place a.envfile in your project directory with key-value pairs for each environment variable. Tools likepython-dotenv,pipenv, anduvcan automatically load these variables when running your application. This is a convenient and secure way to manage configuration, as it keeps sensitive data out of your shell history and version control (if.envis in.gitignore). For example, create a.envfile with the following content from the.env.examplefile provided in the repository:
cp .env.example .env
Then edit the .env file to set your CockroachDB configuration:
OR,
- Setting Variables in the Shell: You can export environment variables directly in your shell before running your application. For example:
export CRDB_URL= postgresql://root@127.0.0.1:26257/defaultdb
This method is helpful for temporary overrides or quick testing.
Integrations
Integrating this MCP Server with development frameworks like OpenAI Agents SDK or using tools like Claude Desktop, VS Code, or Augment is described in the following sections.
OpenAI Agents SDK
Integrate this MCP Server with the OpenAI Agents SDK. Read the documents to learn more about the integration of the SDK with MCP.
Install the Python SDK.
pip install openai-agents
Configure the OpenAI token:
export OPENAI_API_KEY="<openai_token>"
And run the application.
python3 examples/cockroachdb_assistant.py
You can troubleshoot your agent workflows using the OpenAI dashboard.
Augment
You can configure the CockroachDB MCP Server in Augment by importing the server via JSON:
{
"mcpServers": {
"CockroachDB MCP Server": {
"command": "uvx",
"args": [
"--from",
"git+https://github.com/amineelkouhen/mcp-cockroachdb.git",
"cockroachdb-mcp-server",
"--url",
"postgresql://root@localhost:26257/defaultdb",
"--read-only"
]
}
}
}
Claude Desktop
The simplest way to configure MCP clients is using uvx. Add the following JSON to your claude_desktop_config.json, remember to provide the full path to uvx.
{
"mcpServers": {
"cockroach-mcp-server": {
"type": "stdio",
"command": "/opt/homebrew/bin/uvx",
"args": [
"--from", "git+https://github.com/amineelkouhen/mcp-cockroachdb.git",
"cockroachdb-mcp-server",
"--url", "postgresql://localhost:26257/defaultdb"
]
}
}
}
Please follow the prompt and give the details to configure the server and connect to CockroachDB (e.g., using a managed CockroachDB instance).
The procedure will create the proper configuration in the claude_desktop_config.json configuration file.
VS Code with GitHub Copilot
To use the CockroachDB MCP Server with VS Code, you must enable the agent mode tools. Add the following to your settings.json:
{
"chat.agent.enabled": true
}
You can start the GitHub desired version of the CockroachDB MCP server using uvx by adding the following JSON to your settings.json:
"mcp": {
"servers": {
"CockroachDB MCP Server": {
"type": "stdio",
"command": "uvx",
"args": [
"--from", "git+https://github.com/amineelkouhen/mcp-cockroachdb.git",
"cockroachdb-mcp-server",
"--url", "postgresql://root@localhost:26257/defaultdb"
]
},
}
},
Alternatively, you can start the server using uv and configure your mcp.json or settings.json. This is usually desired for development.
{
"servers": {
"cockroach": {
"type": "stdio",
"command": "<full_path_uv_command>",
"args": [
"--directory",
"<your_mcp_server_directory>",
"run",
"src/main.py"
],
"env": {
"CRDB_HOST": "<your_cockroachdb_hostname>",
"CRDB_PORT": "<your_cockroachdb_port>",
"CRDB_DATABASE": "<your_cockroach_database>",
"CRDB_USERNAME": "<your_cockroachdb_user>",
"CRDB_PWD": "<your_cockroachdb_password>"
}
}
}
}
For more information, see the VS Code documentation.
Cursor
Read the configuration options here and input your selections with this link:
Testing
Unit tests
The repository ships with a pytest suite covering the SQL identifier validators, type serializers, DSN parsing, URL helpers, output formatting, and policy gating (read-only mode, destructive-op gating, injection rejection).
uv sync --extra dev
uv run pytest -v
CI runs the same suite on Python 3.12 and 3.13. See .github/workflows/test.yml.
Linting
uv run ruff check src tests
uv run ruff format --check src tests
MCP Inspector
For interactive debugging of the live server, use the MCP Inspector:
npx @modelcontextprotocol/inspector uv run src/main.py
Quality Badge
examples/cockroachdb_assistant.py
import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerStdio
from agents import Agent, Runner, trace
# Set up and create the agent
async def main():
# Instanciate the CockroachDB MCP Server.
async with MCPServerStdio(
name="CockroachDB MCP Server",
params={
"command": "uv",
"args": [
"run", "src/main.py"
],
"env": {
"CRDB_HOST": "127.0.0.1",
"CRDB_PORT": "26257",
"CRDB_USERNAME": "root",
"CRDB_PWD": "",
"CRDB_DATABASE": "defaultdb",
"CRDB_SSL_MODE": "disable"
},
}
)as server:
agent = Agent(
name="CockroachDB Assistant",
instructions="Use the tools to answer the user's questions",
mcp_servers=[server],
)
with trace(workflow_name="Conversation"):
conversation = []
result = None
while True:
if result:
conversation = result.to_input_list()
conversation.append({"role": "user", "content": input("User > ")})
result = await Runner.run(agent, conversation)
print(result.final_output)
if __name__ == "__main__":
try:
asyncio.run(main())
except KeyboardInterrupt:
print("\nExiting.")
FAQ
Common questions
Discussion
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