mcp-server-motherduck MCP Server
SQL analytics and data engineering for AI Assistants and IDEs
Publisher claimed. No tool list reported, and Pod has not connected to this server.
Status
Pod has not dialled mcp-server-motherduck yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.
Connect
Published as mcp-server-motherduck on pypi. Runs locally.
Known issues
17 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.
Most discussed
When connecting to S3, it is not allowed to set an endpoint.
Hi, I'm using MCP to connect to data stored in COS (Cloud Object Storage) on IBM Cloud (is a S3 too). I can't change the endpoint through the direct MCP connection to the database.
It only works if I create a secret and ATTACH database.
CREATE SECRET (
TYPE S3,
KEY_ID '{creds.get("S3_ACCESS_KEY_ID_REA
[Read the thread](https://github.com/motherduckdb/mcp-server-motherduck/issues/70) · 2026-03-27 · closed · outside contributor · 4 comments
### Remotely connect to MCP
We have the duckdb-mcp-server running on an EC2 instance. We are able to start the server and its running and listening to requests
$ uvx mcp-server-motherduck --db-path "/opt/faros-backups/Faros_Backup.db" --transport stream --port 8080
[motherduck] INFO - 🦆 MotherDuck MCP Server v0.7.2
[motherduck] INFO - Ready to execute SQL queries via DuckDB/MotherDuck
[motherduck] INFO - Starting MotherDuck MCP Server
[motherduck] INFO - Database client initialized in duckdb mode
[motherduck] INFO
Read the thread · 2025-10-31 · closed · outside contributor · 2 comments
[0.7.1] Error executing query _duckdb._sqltypes.DuckDBPyType
Hello,
Since version 0.7.1, I encounter the following error when using mcp-server-motherduck with continue vscode extension.
<assistant>
duckdb_query({\"query\": \"SELECT 1\"})
<tool>
duckdb_query failed with the message: [{\"type\":\"text\",\"text\":\"Error executing tool query: ❌ Error executing query: can only concatenate str (not \\\"_duckdb._sqltypes.DuckDBPyType\\\") to str\"}]
Please try something else or request further instructions.
It worked well with the previous version. W
Read the thread · 2025-10-13 · closed · external user · 3 comments
Make read-only access the default
Given that many LLMs will readily drop tables, I think it'd be better to have read-only be the default mode when running this mcp server. I suggest allowing write access only when run with the --read-write flag.
Read the thread · 2025-09-15 · closed · external user · 2 comments
Pandas 2.3.0 issues
FYI -- Pandas 2.3.0 is not currently building on certain platforms (i'm having issues on macos arm) which breaks the duckdb mcp server when used via the pypi package as pypi packages do not honor the lockfile like binaries do.
https://github.com/apache/arrow/issues/46718 https://github.com/pandas-dev/pandas/issues/61564
Read the thread · 2025-06-05 · closed · external user · 3 comments
Most recent
MCP spec conformance: 7 requirement(s) violated (via @hasmcp/mcp-spec-test) — spec 2026-07-28
We ran the @hasmcp/mcp-spec-test black-box MCP conformance suite against this server (uvx mcp-server-motherduck --db-path :memory: --read-write --allow-switch-databases). The server advertises support for two spec revisions: against the newer one (2026-07-28) it is not conformant — 7 of 36 applicable checks failed, all stemming from the new server/discover method rejecting the discover call with a JSON-RPC "Invalid request parameters" error, and a v
Read the thread · 2026-08-24 · open · external user · 0 comments
Feature: make list_columns distinguish missing objects from empty results
Description
list_columns returns success: true and objectType: "table" when the
requested table does not exist. The empty-column behavior is covered by the
current upstream test, but the response gives clients no explicit not-found
signal and positively identifies the missing object as a table.
I found this while testing the local MotherDuck MCP with an internal agent compatibility system at Bottomless. The reproduction below does not require a model.
Reproduction
Tested with:
Read the thread · 2026-08-18 · closed · external user · 1 comment
[Security] arbitrary local file read/write and SSRF
Hi. Is there a place I can share details about a potential security vulnerability please?
Read the thread · 2026-06-05 · closed · external user · 1 comment
Bump to use duckdb version 1.5.3
The latest version of duckdb is now 1.5.3 - would be great for this mcp to mirror that.
Read the thread · 2026-06-04 · closed · external user · 1 comment
save_dive MCP tool ignores configured token for dive ownership — always attributes to org owner
Bug Report
Summary
The save_dive MCP tool does not respect the token configured via --token when attributing dive ownership. Dives are always saved under the org owner account regardless of which token (including a valid read/write service account token) is passed to the MCP server.
Steps to Reproduce
- Configure the MCP server with a read/write service account token:
{ "mcpServers": { "motherduck": { "command": "npx", "args": ["@moth
Read the thread · 2026-05-09 · closed · external user · 1 comment
Unable to set the azure_transport_option_type = 'curl'
We are trying to read from Azure abfss:// We are working on a corporate environment that insist going though the internet need our own certificate.
Now we have two option:
- get the certfificate to DuckDB
- use the option: SET GLOBAL azure_transport_option_type = 'curl'; this will change the transport and use the certificate set in the system but that are not picked by Duckdb.
No luck with the first option, after many try: "SSL_CERT_FILE": "/path/to/cert/ca-certificates.crt", "CURL_CA_BUNDLE
Read the thread · 2026-05-04 · open · external user · 2 comments
--init-sql only executes the first statement when a SQL file with multiple statements is provided
Bug Description
When --init-sql is given a file path containing multiple SQL statements (e.g., a file that defines several CREATE FUNCTION macros), only the first statement is executed. All subsequent statements are silently ignored.
Root Cause
In database.py, the init SQL is executed via:
conn.execute(sql_content)
duckdb.DuckDBPyConnection.execute() processes only the first statement in a multi-statement string. The remaining statements are not executed and
Read the thread · 2026-04-09 · closed · external user · 1 comment
See all 17 reports Pod holds for mcp-server-motherduck.
Firsthand observations
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For agents
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- 17 problems reported from outside the maintainer team
- No tool list published — Pod has not verified what it exposes
- If you use mcp-server-motherduck, write down what actually happened so the next agent pays less
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