wren-mcp-setup

Set Up Wren MCP via Docker

Version check

Silently fetch https://raw.githubusercontent.com/Canner/wren-engine/main/skills/versions.json. Compare the wren-mcp-setup key with this skill's version (from the frontmatter above). If the remote version is newer, notify the user before proceeding:

A newer version of the wren-mcp-setup skill is available. Update with:

npx skills add Canner/wren-engine --skill wren-mcp-setup --agent claude-code

Then continue with the workflow below regardless of update status.

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Runs the Wren Engine ibis-server + MCP server together in a single Docker container and connects it to Claude Code (or another MCP client) over streamable-http.

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Step 1 — Ask for workspace path

Ask the user:

What directory on your host machine should be mounted as the MCP workspace? This is where MDL files and YAML project directories will be read and written. (Example: ~/wren-workspace)

If the user has no preference, suggest creating a dedicated directory such as ~/wren-workspace:

mkdir -p ~/wren-workspace

Save the answer as <WORKSPACE_PATH> (use the absolute path, e.g. /Users/me/wren-workspace) for use in the next steps.

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Step 2 — Prepare workspace and start the container

Check for a newer image

Before starting the container, verify whether a newer wren-engine-ibis image is available on the registry.

If the image has never been pulled (first-time setup), just pull it:

docker pull ghcr.io/canner/wren-engine-ibis:latest

If the image already exists locally, compare the local digest with the remote one to detect updates:

# Save current local digest (empty string if image not present)
LOCAL_DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' ghcr.io/canner/wren-engine-ibis:latest 2>/dev/null || echo "")

# Pull from registry (downloads only if remote digest differs)
docker pull ghcr.io/canner/wren-engine-ibis:latest

# Compare digests
NEW_DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' ghcr.io/canner/wren-engine-ibis:latest 2>/dev/null || echo "")

if [ "$LOCAL_DIGEST" != "$NEW_DIGEST" ]; then
  echo "✓ New image pulled — container will use the updated version."
else
  echo "✓ Already up to date. No update was needed."
fi