Crystallize MCP

Crystallize MCP

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MCP server for Crystallize headless commerce. Gives AI agents read and write access to your catalogue, products, shapes, orders, customers, and tenant config — with deep links back to the Crystallize UI, dry-run safety for mutations, and PII masking for customer data.

Works with Claude Code, Claude Desktop, Cursor, Windsurf, Copilot, and any MCP-compatible client.

Getting started

Setup wizard

The interactive wizard handles config, auth tokens, keychain storage, and PII mode in one step:

# Project-level — writes .mcp.json in the current directory (shared with your team)npx @hayodev/crystallize-mcp --setup
# Global — registers via `claude mcp add` (Claude Code) or writes Claude Desktop confignpx @hayodev/crystallize-mcp --setup --global

Manual config

Standard MCP config (works in any client):

{  "mcpServers": {    "crystallize": {      "command": "npx",      "args": ["-y", "@hayodev/crystallize-mcp@latest"],      "env": {        "CRYSTALLIZE_TENANT_IDENTIFIER": "your-tenant"      }    }  }}

Add CRYSTALLIZE_ACCESS_TOKEN_ID and CRYSTALLIZE_ACCESS_TOKEN_SECRET to the env block for PIM tools (shapes, orders, customers). See Authentication.

claude mcp add crystallize \  -e CRYSTALLIZE_TENANT_IDENTIFIER=your-tenant \  -e CRYSTALLIZE_ACCESS_TOKEN_ID=your-token-id \  -e CRYSTALLIZE_ACCESS_TOKEN_SECRET=your-token-secret \  -- npx -y @hayodev/crystallize-mcp@latest

{  "servers": {    "crystallize": {      "command": "npx",      "args": ["-y", "@hayodev/crystallize-mcp@latest"],      "env": {        "CRYSTALLIZE_TENANT_IDENTIFIER": "your-tenant",        "CRYSTALLIZE_ACCESS_TOKEN_ID": "your-token-id",        "CRYSTALLIZE_ACCESS_TOKEN_SECRET": "your-token-secret"      }    }  }}

git clone https://github.com/HayoDev/crystallize-mcp.gitcd crystallize-mcpnpm install && npm run buildnpx . --setup --local   # writes .mcp.json pointing to ./build/

{  "mcpServers": {    "crystallize": {      "command": "node",      "args": ["/path/to/crystallize-mcp/build/src/bin/crystallize-mcp.js"],      "env": {        "CRYSTALLIZE_TENANT_IDENTIFIER": "your-tenant"      }    }  }}

Tools (16)

Catalogue (4 tools)

Discovery (3 tools)

Shapes & Tenant (3 tools, requires auth)

Orders (2 tools, requires auth)

Customers (2 tools, requires auth)

Content (2 tools, requires auth + write mode)

Write tools

Write tools require CRYSTALLIZE_ACCESS_MODE=write (or admin) and a token with write permissions.

Dry-run mode

Set CRYSTALLIZE_DRY_RUN=true to preview mutations without executing them. The response shows exactly what would change — the mutation payload, before/after values, and a deep link to the item:

"env": {  "CRYSTALLIZE_ACCESS_MODE": "write",  "CRYSTALLIZE_DRY_RUN": "true"}

Example prompts

Create an item:

"Create a new blog post under /blog using the article shape with title 'Getting Started'"

Update a top-level component:

"Find the item at /products/summer-collection and update its description to 'New summer arrivals'"

Update a component inside a content chunk:

"Get the item at /articles/my-post, then update hero.title to 'Updated Headline' and give me the deep link to review the draft"

Update with change summary:

"Get the item at /articles/guides/my-guide, update its title component to 'New Guide Title', give me the deep link, and show a table of which fields in the chunk changed vs remained unchanged with before/after values"

The agent will update the target component in draft only, preserve all sibling components in the chunk, and return a summary like:

No publishing happens — you review the change in the Crystallize UI via the deep link and publish when ready.

Authentication

Catalogue and Discovery tools work without auth — just set CRYSTALLIZE_TENANT_IDENTIFIER.

For PIM tools (shapes, tenant info, orders, customers), create an access token at: https://app.crystallize.com/{tenant}/en/settings/access-tokens

Note: Crystallize tokens inherit permissions from the user who created them. To restrict an agent to read-only access, generate the token under a user with a read-only role. See Crystallize Roles.

Environment variables

PII mode (opt-in)

By default all customer and order data is returned as-is (full). Set CRYSTALLIZE_PII_MODE to opt in to data minimisation:

Applies to list_customers, get_customer, list_orders, and get_order. No effect on catalogue or shape tools.

Relevant for teams handling real customer data, GDPR Article 25 compliance (data minimisation by design), or environments where the AI doesn't need raw contact details to do its job. A common pattern is masked on production and full on dev.

Audit log (opt-in)

Set CRYSTALLIZE_AUDIT_LOG to an absolute file path to enable structured logging of every tool call:

{  "ts": "2026-04-03T14:38:41Z",  "tool": "list_customers",  "params": { "first": 10 },  "result": "ok",  "tenant": "my-store"}

One JSON line per call — timestamp, tool name, params, result (ok/error), and tenant. Write tools also log mutation metadata (before/after state) for audit trails.

Note: Params are logged as-is and may contain PII — for example, a searchTerm of [email protected] or a customerIdentifier. Treat the audit log file as sensitive data and restrict access accordingly. Param scrubbing is on the roadmap but not yet implemented.

Easy to pipe into log aggregators (Datadog, CloudWatch, Splunk) — but ensure your pipeline handles the file with appropriate access controls.

Keychain storage (optional)

The setup wizard (npx @hayodev/crystallize-mcp --setup) can store tokens in the OS keychain (macOS Keychain, Windows Credential Manager, or libsecret on Linux) so they never appear as plain text in config files. The MCP server resolves credentials from the keychain automatically at startup — no extra configuration needed.

This is useful when:

• Your .mcp.json is committed to git — keychain keeps tokens out of the repository
• You prefer not to have secrets in plain text config files — the config only needs CRYSTALLIZE_TENANT_IDENTIFIER

When using --setup --global with Claude Code, this applies only if keychain storage is available and you opt into it: in that case, the wizard runs claude mcp add with only the non-secret env vars, and tokens are read from the keychain at runtime so they do not appear in Claude Code config. If keychain storage is unavailable or you choose not to use it, the wizard passes token env vars to claude mcp add, and Claude Code may store them in plain text.

Access mode

CRYSTALLIZE_ACCESS_MODE controls which tools the MCP server registers at startup:

• read (default) — read-only tools only
• write — includes content creation and component updates (with dry-run support)
• admin — full access including shape modifications and tenant config

Deep links

Every response includes clickable links to the Crystallize UI:

• Items → app.crystallize.com/@{tenant}/{language}/catalogue/{type}/{itemId}
• Shapes → app.crystallize.com/@{tenant}/{language}/settings/shapes/{identifier}
• Orders → app.crystallize.com/@{tenant}/{language}/orders/{orderId}

The language segment is automatically set from the tenant's default language, bootstrapped at server startup — no configuration needed. Tools that accept a language parameter (catalogue, search) use the requested language in both the API call and the generated link.

Development

npm installnpm run buildnpm run dev          # build + startnpm run lint         # oxlintnpm run format       # oxlint --fix + oxfmtnpm run typecheck    # tsc --noEmitnpm run test         # build + node --test

License

MIT