Feature Codebase Chat

Ask your codebase
anything. Get
answers with sources.

Chat knows your project. Ask how something works, where a bug comes from or how to build the next thing, and get answers that point to the exact files and lines.

Rated 4.5/5 from 1400 Users
Nexus Chat panel answering a question with references to project files
kinds of @ context: files, folders, docs and commits
4
to apply a suggested diff
1 click
of answers linked to the source lines
100%
How it works

Get unstuck in one conversation

  1. 01

    Ask in plain words

    Type a question, select code to ask about it, or paste an error message.

  2. 02

    Add the right context

    @mention files, folders, docs or a pull request so the answer is grounded in your code.

  3. 03

    Apply or keep asking

    Answers come with inline diffs you can apply in one click, or follow up until it makes sense.

In detail

A teammate who has read the whole repo

  • @ context

    Point at exactly what matters

    Reference files, folders, docs and commits with @. Nexus also pulls in related code from the index on its own.

    • @file, @folder, @docs, @commit
    • Automatic related-code lookup
    • Paste images and error logs
  • Inline diffs

    Answers you can apply

    When the answer is a change, Chat shows it as a diff in place. Apply it, edit it first, or copy it.

    • Apply to the file in one click
    • Edit a suggestion before applying
    • Explain any line in the diff
  • History

    Conversations that stay with the project

    Every chat is saved per project, searchable and shareable, so the reasoning behind a change does not get lost.

    • Searchable history per project
    • Share a thread with a link
    • Pin answers as project notes
Use cases

Questions teams ask Chat every day

  • Onboard to a new codebase

    Ask how the app is structured and where to start.

  • Trace a bug

    Paste the error and follow the call path to the cause.

  • Understand legacy code

    Get a plain explanation of what a module really does.

  • Plan a change

    Talk through an approach before writing any code.

  • Review a pull request

    Ask what changed, what might break and what to test.

  • Write docs

    Turn a conversation into a README section or ADR.

“New hires ask Chat before they ask us. Onboarding went from two weeks to a few days.”

Priya Nair Engineering Manager, Unify
Specs

The details

Everything you need to know before you turn on Codebase Chat.

Compare plans
Where it runs
VS Code, JetBrains IDEs, the desktop app and the web
Context
@files, folders, docs, commits and pull requests
Models
Pick a model per chat, or let Nexus choose
Sharing
Share threads with your team, with access controls
Plans
Free with daily limits, longer context on Pro and Team
Privacy
Your code is never used to train models. SOC 2 Type II

Codebase Chat FAQ

It searches your project index for code related to each question and adds what you @mention. You can see the sources it used under every answer.

Chat suggests diffs you apply with one click. For changes across many files, hand the task to Agent instead.

Only you, unless you share a thread. Team admins can set whether sharing is allowed.

Yes, on Team plans. Add your provider key in settings and pick it from the model menu.

Can’t find your answer? Contact our support team

Every feature shares the same project index, so they work better together.

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