Use TraitLab with Claude

Give Claude the context to tailor its answers to your personality, strengths, and interests.

Once you complete this setup, Claude will be able to pull up your real TraitLab personality data — your traits, adjectives, working style, interpersonal style, personality type, and strengths — right in the middle of a conversation. You’ll be able to ask things like “What career paths fit my personality?” or “How should I approach a tough conversation with my partner, given how I’m wired?” and Claude will actually know your results instead of guessing.

This only needs to be set up once. After that, it works in Claude Desktop, the Claude mobile app, and claude.ai in your web browser — all from the same connection.

Before you start

Make sure you have all three of these ready:

A TraitLab account with a completed profile. If you haven’t taken the assessment yet, go create your account and finish it at traitlab.com before continuing — there needs to be data for Claude to access.
A Claude account (the free plan works fine, as do Pro, Max, Team, or Enterprise).
Claude Desktop installed on your computer (this is the app, not just the website). This first-time setup step needs to happen in Claude Desktop or in a web browser at claude.ai — it can’t be done from the Claude mobile app.

Which reports Claude can see: Free TraitLab accounts include your Big Five traits and descriptive adjectives. TraitLab Plus is required for the connector to also access your interpersonal style, working style, strengths, and personality typologies (Jungian and Enneagram).

That’s it. Let’s connect them.

Step 1: Open Claude Desktop and go to Connectors

Launch the Claude Desktop app on your computer.
Look for the Customize section in Claude’s settings. You can usually get there by clicking your profile icon or the settings gear, then choosing Customize.
Inside Customize, click Connectors. This is the page where all of Claude’s connected tools and services live.

Step 2: Add TraitLab as a custom connector

On the Connectors page, click the ”+” button.
Choose Add custom connector. (This is different from browsing Claude’s built-in directory of pre-approved connectors — TraitLab isn’t listed there yet, so you’ll be plugging in the address directly.)
A small form will appear asking for a name and a URL:
- Name: TraitLab
- URL: carefully type or paste in:
```
https://mcp.traitlab.com/mcp
```
You can ignore the “Advanced settings” option (OAuth Client ID / Secret) — TraitLab’s connector handles that part automatically once you log in, so you don’t need to fill anything in there.
Click Add.

Note for free-plan users: Claude’s free plan allows one custom connector at a time. If you’ve already added a different custom connector, you’ll need to remove it first before adding TraitLab.

Step 3: Log in to TraitLab to finish connecting

Right after you click Add, Claude will redirect you to a TraitLab login screen. This is TraitLab’s own secure login page — you’re briefly leaving Claude to prove to TraitLab that this is really you.

Login to your existing TraitLab account.
You may see a screen asking you to authorize Claude to access your TraitLab profile data. Review it, then approve/allow it.
You’ll be redirected back to Claude Desktop automatically. You should now see TraitLab listed in your Connectors page, showing as connected.

That’s the whole setup. You will not need to log in again on this device, and — this is the useful part — you also won’t need to repeat any of this on your phone or in a browser. Because this connection lives in the cloud (not just on your computer), it’s automatically available the next time you open Claude on claude.ai in a browser or in the Claude mobile app. Just make sure the TraitLab connector is toggled on for the conversation you’re in (more on that below).

Turning the connector on for a conversation

Having TraitLab connected doesn’t mean it’s automatically active in every single chat. In each conversation:

Click the ”+” button at the bottom-left of the chat box.
Choose Connectors.
Make sure the TraitLab toggle is switched on.

Some people like to leave it on all the time; others prefer to turn it on only when they want Claude to reference their personality data. Either is fine.

Tips for getting better answers

Once it’s connected, the best way to use it is to just talk to Claude the way you would about anything else, but let it know you want your TraitLab data factored in. Claude is often smart enough to know when to consult your TraitLab profile based on context, but you can also directly suggest to check it, too. A few ways to try it:

Self-understanding

Pull up my TraitLab traits and explain, in plain language, what my Big Five scores actually mean about how I operate day to day.

Career and work style

Based on my TraitLab working style and strengths, what kinds of roles or environments tend to be a good fit for someone like me? What should I be cautious about?

Relationships and communication

I’m having a disagreement with a close friend. Here’s what happened: [describe it]. Given my interpersonal style from TraitLab, how might I be coming across, and what’s a constructive way to approach this?

Personality typology curiosity

What’s my Enneagram type and wing according to TraitLab, and how does that show up in the way I handle stress?

Combining reports

Looking at my traits, strengths, and working style together, write me a short personal profile I could use to introduce myself on a new team.

A few tips for getting the most out of it:

Be specific about which report you want. Claude has access to seven different types of TraitLab data (traits, adjectives, Jungian type, Enneagram, strengths, career/working style, and interpersonal style). If you ask a broad question, Claude may pull from several; if you want one in particular, just name it.
Ask “why,” not just “what.” Claude can explain the reasoning behind a score or category, not just report the label — push it to unpack what a result actually means for your specific situation.
Give it real context. TraitLab data is most useful when paired with a real situation — a decision you’re weighing, a conflict you’re navigating, a job description you’re considering. Drop those details in.
Treat it as a thoughtful second opinion, not a verdict. Personality assessments describe tendencies, not fixed rules. If something Claude says based on your profile doesn’t ring true, say so — that’s useful signal, not an error.
For big decisions, don’t stop at Claude. For major career moves, serious relationship issues, or anything with real stakes, use this as one input among several — alongside your own judgment and, where it matters, actual professionals (career counselors, therapists, mentors).

If something goes wrong

Connector won’t add / URL rejected: double check you typed https://mcp.traitlab.com/mcp exactly, with no extra spaces.
Login screen doesn’t appear: try removing the connector and adding it again.
Claude says it can’t find your data: confirm the TraitLab toggle is switched on for that specific conversation (Step “Turning the connector on for a conversation” above), and that your TraitLab profile is actually complete on traitlab.com.
Still stuck: disconnect the connector from Customize > Connectors and reconnect it — this resolves most login/authorization hiccups.

Footnote: What is MCP?

MCP stands for Model Context Protocol. In simple terms, it’s a way for Claude to connect to outside services and ask them for information or actions in a structured way.

For TraitLab, MCP is what allows Claude to retrieve relevant parts of your TraitLab profile when you ask for personality-informed help. You don’t need to understand MCP to use the TraitLab connector — the important idea is that it lets Claude use your TraitLab results without requiring you to copy and paste them manually.