First-Run Style Guide Gating in Diagram Design: Preventing Silent Brand Mismatches

First-run style guide gating is a mandatory configuration checkpoint that forces users to explicitly choose or customize their diagram branding before generating any output, ensuring that default styles cannot silently override established brand identities.

The cathrynlavery/diagram-design repository employs this protective mechanism to safeguard brand consistency across diagram generations. When you request your first diagram in a fresh project, the system intercepts the call to verify whether your active style guide has been deliberately configured or is still running factory defaults.

What Is First-Run Style Guide Gating?

First-run style guide gating is a one-time prompt that appears during the initial diagram generation in any new project. According to the source documentation in skills/diagram-design/SKILL.md (lines 17-31), the system checks whether the effective style guide remains the shipped default—a neutral white-smoke palette with an atomic-tangerine accent.

If the system detects these default values, it presents a gated prompt that blocks generation until the user makes an explicit decision. This gate appears only once per project. After the user either customizes the style guide or explicitly confirms they want to proceed with defaults, the gate permanently clears for that project.

How the Gate Prevents Silent Brand Mismatches

Silent brand mismatches occur when plugin updates or accidental resets overwrite carefully configured branding without warning. The gating mechanism prevents this through two protective strategies:

Profile Persistence. Once you save a custom style guide as a named profile, that configuration survives plugin updates. As noted in the repository's README.md (line 164), saved profiles persist independently of managed installs, ensuring your brand tokens remain intact even when the core tool updates.

Explicit Customization Markers. The system treats any deviation from the shipped defaults—such as a leading profile header or modified color tokens—as a "customized" state. Once marked, subsequent calls to diagram_design generate bypass the gate entirely. The skills/diagram-design/references/profiles.md file (line 80) confirms that "once a profile is present, subsequent runs bypass the gate."

Configuration Options at the Gate

When the gate triggers, users must select from six explicit options to proceed:

• (a) Pull from website — Extract tokens from a live URL
• (b) Extract from installed skill — Import from an existing plugin
• (c) Local folder extraction — Load from a design-system directory
• (d) Manual token entry — Paste values directly
• (e) Proceed with default — Explicitly keep the white-smoke/atomic-tangerine palette
• (f) Load saved profile — Apply a previously stored brand configuration

This forced choice architecture ensures that no user accidentally generates diagrams with mismatched branding.

Practical Workflow Examples

The following commands demonstrate the complete lifecycle of the gating mechanism:

Triggering the gate on first run:

# First diagram generation in a new project

diagram_design generate my-diagram.yaml

# Output: "This is your first diagram in this project. The style guide is still at the default..."

# Options (a) through (f) are displayed

Customizing and saving a profile:

# Select option (d) to paste tokens manually, then persist the configuration

diagram_design profile save --name my-brand --source-url https://my-brand.com/style-guide

Subsequent runs skip the gate:

# After saving a profile, the gate clears automatically

diagram_design generate another-diagram.yaml

# No prompt shown; uses the saved my-brand profile

Inspecting active configuration:

# Verify which style guide is currently active

diagram_design style-guide show

# Displays the customized guide or confirms default status

Summary

• First-run style guide gating forces explicit branding decisions before any diagram generation occurs in cathrynlavery/diagram-design.
• The system detects unconfigured states by checking for the default white-smoke palette and atomic-tangerine accent.
• Six configuration options allow users to pull brand assets from websites, skills, local folders, manual entry, defaults, or saved profiles.
• Once customized or explicitly confirmed, the gate clears permanently for that project, as tracked in profiles.md.
• Saved profiles survive plugin updates, preventing silent brand mismatches when the core tool updates.

Frequently Asked Questions

How does the system know when to show the first-run prompt?

The system checks whether the effective style guide matches the shipped defaults exactly. If it detects the neutral white-smoke palette with the atomic-tangerine accent characteristic of factory settings, it triggers the gate. Any modification—whether a saved profile header, custom color values, or imported tokens—marks the guide as "customized" and suppresses the prompt on future runs.

Can I change my style guide after bypassing the gate?

Yes. While the first-run gate only appears once, you can modify your style guide at any time using the diagram_design profile commands or by directly editing your configuration files. The gate specifically protects against unintentional default usage during initial setup, not against subsequent intentional changes.

Will plugin updates reset my custom style guide?

No. According to the README.md documentation, saved profiles persist independently of managed installs and plugin updates. The gating mechanism ensures you explicitly chose your configuration path initially, and the profile storage architecture ensures that choice survives version bumps without silent reversion to defaults.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}