/microsoft:mssql

Manage the vendored MssqlMcp servers (Node.js and .NET). The plugin ships with pre-built servers - this skill is for diagnostics, rebuilding, and upstream updates.

Subcommands

Parse the first positional argument from $ARGUMENTS:

Subcommand	Description
status	Check environment, verify artifacts, test connectivity (default if no args)
rebuild	Rebuild servers from existing source code
update	Pull latest from upstream GitHub and rebuild

Flags

Flag	Applies to	Description
--node	status, rebuild	Only operate on Node.js server
--dotnet	status, rebuild	Only operate on .NET server
--check	update	Show what would change without applying

Subcommand: status (default)

Check environment configuration, verify build artifacts exist, and test database connectivity.

Step 1: Check Environment Variables

echo "--- Node (Azure/cloud) ---"
echo "MSSQL_NODE_AUTH_TYPE: ${MSSQL_NODE_AUTH_TYPE:-azure-default (default)}"
echo "MSSQL_NODE_SERVER: ${MSSQL_NODE_SERVER:-localhost (default)}"
echo "MSSQL_NODE_DATABASE: ${MSSQL_NODE_DATABASE:-master (default)}"
echo "MSSQL_NODE_USER: ${MSSQL_NODE_USER:-(not set)}"
echo "MSSQL_NODE_PASSWORD: ${MSSQL_NODE_PASSWORD:+(set)}"
echo "MSSQL_NODE_ENCRYPT: ${MSSQL_NODE_ENCRYPT:-true (default)}"
echo "MSSQL_NODE_READONLY: ${MSSQL_NODE_READONLY:-true (default)}"
echo "MSSQL_NODE_TRUST_CERT: ${MSSQL_NODE_TRUST_CERT:-true (default)}"
echo ""
echo "--- .NET (local) ---"
echo "MSSQL_CONNECTION_STRING: ${MSSQL_CONNECTION_STRING:+(custom)}"
echo "MSSQL_DOTNET_SERVER: ${MSSQL_DOTNET_SERVER:-localhost (default)}"
echo "MSSQL_DOTNET_DATABASE: ${MSSQL_DOTNET_DATABASE:-master (default)}"
echo "MSSQL_DOTNET_AUTH_TYPE: ${MSSQL_DOTNET_AUTH_TYPE:-windows (default)}"
echo "MSSQL_DOTNET_READONLY: ${MSSQL_DOTNET_READONLY:-true (default)}"

Step 2: Verify Build Artifacts

# Node.js - check bundle exists (single-file, no node_modules needed at runtime)
ls ${CLAUDE_PLUGIN_ROOT}/vendor/MssqlMcp/Node/bundle/index.cjs

# Node.js - check dist exists (used by bundle step)
ls ${CLAUDE_PLUGIN_ROOT}/vendor/MssqlMcp/Node/dist/index.js

# .NET - check published exe exists
ls ${CLAUDE_PLUGIN_ROOT}/vendor/MssqlMcp/dotnet-publish/MssqlMcp.exe

Report:

Build Artifacts

  Node.js:
    bundle/index.cjs: Found (runtime entry point)
    dist/index.js: Found (used by bundle step)

  .NET:
    dotnet-publish/MssqlMcp.exe: Found (pre-built, ready to use)

Step 3: Test Database Connectivity

# For LocalDB
sqlcmd -S "(localdb)\MSSQLLocalDB" -d master -Q "SELECT @@VERSION" -C

# For custom server
sqlcmd -S "${MSSQL_NODE_SERVER}" -d "${MSSQL_NODE_DATABASE}" -Q "SELECT @@VERSION" -C

Step 4: Report

SQL Server MCP Status

Environment:
  Server: (localdb)\MSSQLLocalDB
  Database: master
  Auth: azure-default
  Mode: Read-only

Build Status:
  mssql-node: Ready (bundle/index.cjs found)
  mssql-dotnet: Ready (dotnet-publish/MssqlMcp.exe found)

Connectivity:
  sqlcmd test: Success
  SQL Version: Microsoft SQL Server 2022 (RTM)

Status: READY

Subcommand: rebuild

Rebuild servers from existing source code. Use after modifying source or fixing a corrupted build.

Prerequisites

• Node.js: Node.js 18+ with npm
• .NET: .NET 8 SDK

Step 1: Check Prerequisites

node --version
npm --version
dotnet --version

Step 2: Build Node.js (unless --dotnet)

cd ${CLAUDE_PLUGIN_ROOT}/vendor/MssqlMcp/Node
npm install
npm run build
npm run bundle

Verify:

ls dist/index.js
ls bundle/index.cjs

Step 3: Build .NET (unless --node)

cd ${CLAUDE_PLUGIN_ROOT}/vendor/MssqlMcp/dotnet
dotnet publish MssqlMcp/MssqlMcp.csproj -c Release -o ../dotnet-publish

Verify:

ls ${CLAUDE_PLUGIN_ROOT}/vendor/MssqlMcp/dotnet-publish/MssqlMcp.exe

Step 4: Force-add rebuilt artifacts to git

git add -f plugins/microsoft/vendor/MssqlMcp/dotnet-publish/
git add -f plugins/microsoft/vendor/MssqlMcp/Node/bundle/
git add -f plugins/microsoft/vendor/MssqlMcp/Node/dist/

Step 5: Report

MssqlMcp Rebuild Complete

Node.js Server:
  Output: bundle/index.cjs (single-file bundle with all deps)

.NET Server:
  Output: dotnet-publish/MssqlMcp.exe

Artifacts re-tracked in git. Commit when ready.

Subcommand: update

Pull latest from upstream Azure-Samples/SQL-AI-samples and rebuild.

WARNING: Local Patches Will Be Overwritten

This plugin includes local patches (documented in vendor/MssqlMcp/PATCHES.md). After updating, you MUST re-apply these patches.

Step 1: Clone Upstream to Temp

TEMP_DIR=$(mktemp -d)
cd "$TEMP_DIR"

git clone --depth 1 --filter=blob:none --sparse \
  https://github.com/Azure-Samples/SQL-AI-samples.git
cd SQL-AI-samples
git sparse-checkout set MssqlMcp

LATEST_COMMIT=$(git rev-parse --short HEAD)
LATEST_MESSAGE=$(git log -1 --format=%s)

Step 2: Compare Versions

cd "${CLAUDE_PLUGIN_ROOT}"
CURRENT_COMMIT=$(cat plugins/microsoft/vendor/MssqlMcp/VERSION 2>/dev/null || echo "unknown")

Report:

MssqlMcp Update Check

  Current: ${CURRENT_COMMIT}
  Upstream: ${LATEST_COMMIT} - ${LATEST_MESSAGE}

If --check, stop here.

Step 3: Copy Files

# Backup current
mv plugins/microsoft/vendor/MssqlMcp plugins/microsoft/vendor/MssqlMcp.bak

# Copy new files (preserving build artifacts and parent .gitignore from backup)
cp -r "$TEMP_DIR/SQL-AI-samples/MssqlMcp" plugins/microsoft/vendor/
cp -r plugins/microsoft/vendor/MssqlMcp.bak/Node/dist plugins/microsoft/vendor/MssqlMcp/Node/ 2>/dev/null || true
cp -r plugins/microsoft/vendor/MssqlMcp.bak/Node/bundle plugins/microsoft/vendor/MssqlMcp/Node/ 2>/dev/null || true
cp -r plugins/microsoft/vendor/MssqlMcp.bak/Node/node_modules plugins/microsoft/vendor/MssqlMcp/Node/ 2>/dev/null || true
cp -r plugins/microsoft/vendor/MssqlMcp.bak/dotnet-publish plugins/microsoft/vendor/MssqlMcp/ 2>/dev/null || true
cp plugins/microsoft/vendor/MssqlMcp.bak/.gitignore plugins/microsoft/vendor/MssqlMcp/ 2>/dev/null || true

# Write version file
echo "${LATEST_COMMIT}" > plugins/microsoft/vendor/MssqlMcp/VERSION

# Cleanup
rm -rf plugins/microsoft/vendor/MssqlMcp.bak
rm -rf "$TEMP_DIR"

Step 4: Rebuild Node.js

cd plugins/microsoft/vendor/MssqlMcp/Node
npm install
npm run build
npm run bundle

Step 5: Rebuild .NET

cd plugins/microsoft/vendor/MssqlMcp/dotnet
dotnet publish MssqlMcp/MssqlMcp.csproj -c Release -o ../dotnet-publish

Step 6: Re-Apply Local Patches

IMPORTANT: Read and re-apply patches from PATCHES.md:

cat plugins/microsoft/vendor/MssqlMcp/PATCHES.md

Current patches to re-apply:

1. Multi-auth support in Node/src/index.ts:
   • Add AuthType type
   • Replace createSqlConfig() with multi-auth factory
   • Update ensureSqlConnection() for SQL auth

After re-applying, rebuild:

cd plugins/microsoft/vendor/MssqlMcp/Node
npm run build && npm run bundle

Step 7: Force-add and Report

git add -f plugins/microsoft/vendor/MssqlMcp/dotnet-publish/
git add -f plugins/microsoft/vendor/MssqlMcp/Node/bundle/
git add -f plugins/microsoft/vendor/MssqlMcp/Node/dist/
git status --short plugins/microsoft/vendor/MssqlMcp/

Examples

# Check status (default)
/microsoft:mssql

# Check status of Node.js server only
/microsoft:mssql status --node

# Rebuild both servers
/microsoft:mssql rebuild

# Rebuild only .NET server
/microsoft:mssql rebuild --dotnet

# Check for upstream updates (dry run)
/microsoft:mssql update --check

# Pull upstream and rebuild
/microsoft:mssql update

Troubleshooting

Node.js build fails:

Common issues:
  1. Old Node.js version - upgrade to 18+
  2. Corrupted node_modules - delete and retry
  3. npm cache issues - npm cache clean --force
  4. zod/TypeScript incompatibility - pin @modelcontextprotocol/sdk to 1.x

.NET build fails:

Common issues:
  1. Wrong SDK version - install .NET 8
  2. Missing workloads - dotnet workload restore
  3. NuGet cache issues - dotnet nuget locals all --clear

Upstream Source

• Repository: https://github.com/Azure-Samples/SQL-AI-samples
• Path: MssqlMcp/
• License: MIT

Related Commands

• /microsoft:setup-dab - Install and configure Data API Builder