How do I run Atlas in a GitHub Actions workflow for a Node.js project?

To run Atlas in a GitHub Actions workflow for Node.js, you would typically add a step that executes `atlas run --prompt " " --format json --model github/gpt-4`. Ensure Atlas is installed in the runner environment and that your Atlas configuration file pre-approves necessary tools like `edit` and `bash` for non-interactive operation within your Node.js repository.

Can Atlas update my `package.json` dependencies in a headless Node.js CI run?

Yes, Atlas can update your `package.json` dependencies. If you provide a prompt that requires dependency changes, and the `edit` and `bash` tools are allowed in your Atlas permission configuration, Atlas can modify `package.json` and even run `npm install` via the `bash` tool to update your Node.js project's dependencies.

How does Atlas handle `node:test` failures when running headless in Node.js CI?

When running headless, Atlas will stream events, including tool outputs, to stdout. If an `npm test` command (which runs `node:test`) executed by Atlas via the `bash` tool fails, this failure will be reflected in the event stream. Your CI pipeline can then parse this JSON output to detect the test failure and halt the pipeline or trigger further actions, such as resuming the Atlas session interactively for debugging.

What is the best way to ensure Atlas's changes are formatted correctly in a Node.js project?

The best way to ensure Atlas's changes are formatted correctly in a Node.js project is to include a step in your CI pipeline immediately after `atlas run` that executes your preferred Node.js formatter, such as `prettier --write .`. This ensures that any code generated or modified by Atlas adheres to your project's established `prettier` rules before being committed.

Can Atlas use local Ollama embeddings for Node.js code indexing in CI?

Yes, Atlas can build its code index with local Ollama embeddings, keeping your Node.js code off third-party servers. This is configurable and ensures that sensitive Node.js project code remains within your infrastructure, even when Atlas is performing semantic and keyword retrieval fused by reciprocal rank fusion for code search.

How does Atlas ensure safety when making changes to Node.js files in CI?

Atlas ensures safety through several mechanisms: every tool call is permission-gated against allow, ask, and deny rules; it drafts a plan in a read-only agent before building; it computes a unified diff for every file edit; and it snapshots file changes as git patches. These features provide transparency and control over any modifications to your Node.js codebase, even in headless CI runs.

Run Atlas Headless in CI for Node.js Projects in 2026

In 2026, Node.js developers can run Atlas sessions non-interactively within CI pipelines to automate code changes and receive machine-readable output, integrating direct with `npm` and `node:test` workflows. The `atlas run` command, combined with `--format json`, enables automated code generation, testing, and review for Node.js services, Express routes, and Fastify applications, ensuring your `package.json` and module structure are respected.

How to Run Atlas Headless in Node.js CI Pipelines

Running Atlas headless in a Node.js CI pipeline in 2026 is achieved using the `atlas run` command, which operates non-interactively by default. This command sends a single prompt to Atlas, allowing it to perform tasks like adding new middleware to an Express application or generating `node:test` cases, then exits once the session becomes idle.

To integrate Atlas into your Node.js CI/CD workflow, you invoke `atlas run` directly within your pipeline script. For instance, a GitHub Actions workflow step for a Node.js project might execute `atlas run --prompt "Add a new utility function to src/utils.js and update its usage in index.js"`. Atlas will then analyze your Node.js codebase, including `package.json` for dependencies and scripts, and propose changes. It leverages its understanding of AST declarations via tree-sitter to index your Node.js modules, ensuring precise code modifications. This non-interactive mode is ideal for automated tasks where human intervention is not desired, such as nightly builds or pre-merge checks that require code generation or refactoring. Atlas can read your Node.js modules, `npm` scripts, and even Express or Fastify routes, making it a powerful tool for maintaining and evolving your Node.js services.

Getting Machine-Readable Output from Atlas for Node.js

For Node.js CI pipelines that require programmatic parsing of Atlas's output, the `--format json` flag is essential. This flag, available with `atlas run`, streams raw event data to stdout, providing a structured JSON feed that downstream pipeline steps can consume to validate changes or trigger further actions in 2026.

When automating tasks in a Node.js environment, machine-readable output is crucial for subsequent steps, such as running `node:test` or `prettier`. By appending `--format json` to your `atlas run` command, Atlas will emit a stream of JSON objects representing its session events, rather than human-readable prose. This allows a Node.js script or another CI tool to parse the output, extract information about file edits, tool calls, or agent status. For example, after Atlas proposes changes to a Node.js module, your CI script could parse the JSON output to identify the modified files, then automatically run `prettier --write .` to format the new code and `npm test` to execute `node:test` cases, ensuring code quality and correctness before committing. This structured output is vital for building robust, automated Node.js development workflows.

Configuring Permissions for Headless Atlas Runs in Node.js

In 2026, headless Atlas runs in Node.js CI require pre-approved tool permissions because there is no interactive user to respond to 'ask' prompts. Atlas's permission configuration allows you to define 'allow', 'ask', or 'deny' rules for tools like `bash`, `read`, `edit`, and `todowrite`, ensuring secure and predictable execution within your Node.js project.

Atlas prioritizes safety, especially in non-interactive environments. For a headless `atlas run` in a Node.js project, you must pre-configure permissions for any tools Atlas might use. This is typically done in a configuration file within your repository. For instance, if Atlas needs to modify a Node.js source file, you would set an 'allow' rule for the `edit` tool. If it needs to execute an `npm` command via `bash`, you'd allow `bash`. Without these explicit permissions, Atlas would halt, waiting for an approval that cannot be given in a headless context. This granular control ensures that Atlas only performs actions you explicitly authorize, preventing unintended modifications to your Node.js codebase, `package.json`, or test files. Atlas also computes a unified diff for every file edit and snapshots file changes as git patches, providing a clear audit trail even in automated runs.

Resuming and Reviewing Atlas Sessions for Node.js Development

Atlas offers robust session management features in 2026, allowing Node.js developers to resume or fork prior headless runs using `--continue`, `--session`, or `--fork`. This capability is crucial for debugging automated CI failures or building upon previous Atlas-generated code, such as adding more `node:test` cases to an existing feature.

Even in a headless CI environment for Node.js, the ability to review and continue an Atlas session is invaluable. If an `atlas run` fails or produces unexpected results, you can use the `--session <session-id>` flag to inspect the exact state of the agent at the time of failure. This allows you to understand why a particular Node.js module wasn't updated as expected or why a `node:test` case wasn't generated correctly. Furthermore, `--continue` allows you to pick up where a previous session left off, perhaps to refine a prompt or address a new requirement. The `--fork` option creates a new session based on an existing one, enabling experimentation without altering the original. Atlas also reads `git` branches, status, and diffs, and can stage and create commits on your behalf, making it easier to review and integrate its work into your Node.js project's version control system.

Step by step

01Install Atlas CLI globally using `npm` if not already present: `npm install -g @atlas/cli`.
02Ensure your Node.js project's `package.json` is in the directory where Atlas will run, allowing Atlas to read your modules and `npm` scripts.
03Configure Atlas permissions for headless execution, explicitly allowing tools like `bash`, `read`, `edit`, and `todowrite` in your Atlas config file to prevent interactive prompts.
04Invoke `atlas run` in your CI pipeline with a specific prompt, `--format json` for machine-readable output, and explicitly set the model, for example: `atlas run --prompt "Add a new Express route to handle user authentication in src/routes/auth.js" --format json --model github/gpt-4`.
05Parse the JSON output stream from `atlas run` in a subsequent pipeline step using a Node.js script or `jq` to extract information about generated files or proposed changes.
06Run Node.js specific quality checks on the modified codebase, such as `prettier --write .` for formatting and `npm test` to execute `node:test` cases, ensuring the changes are valid.
07Review the unified diff generated by Atlas for any file edits, which Atlas surfaces for approval, and potentially stage and commit the changes using `git` commands or Atlas's built-in capabilities.

Frequently asked questions

How do I run Atlas in a GitHub Actions workflow for a Node.js project?: To run Atlas in a GitHub Actions workflow for Node.js, you would typically add a step that executes `atlas run --prompt "<your task>" --format json --model github/gpt-4`. Ensure Atlas is installed in the runner environment and that your Atlas configuration file pre-approves necessary tools like `edit` and `bash` for non-interactive operation within your Node.js repository.
Can Atlas update my `package.json` dependencies in a headless Node.js CI run?: Yes, Atlas can update your `package.json` dependencies. If you provide a prompt that requires dependency changes, and the `edit` and `bash` tools are allowed in your Atlas permission configuration, Atlas can modify `package.json` and even run `npm install` via the `bash` tool to update your Node.js project's dependencies.
How does Atlas handle `node:test` failures when running headless in Node.js CI?: When running headless, Atlas will stream events, including tool outputs, to stdout. If an `npm test` command (which runs `node:test`) executed by Atlas via the `bash` tool fails, this failure will be reflected in the event stream. Your CI pipeline can then parse this JSON output to detect the test failure and halt the pipeline or trigger further actions, such as resuming the Atlas session interactively for debugging.
What is the best way to ensure Atlas's changes are formatted correctly in a Node.js project?: The best way to ensure Atlas's changes are formatted correctly in a Node.js project is to include a step in your CI pipeline immediately after `atlas run` that executes your preferred Node.js formatter, such as `prettier --write .`. This ensures that any code generated or modified by Atlas adheres to your project's established `prettier` rules before being committed.
Can Atlas use local Ollama embeddings for Node.js code indexing in CI?: Yes, Atlas can build its code index with local Ollama embeddings, keeping your Node.js code off third-party servers. This is configurable and ensures that sensitive Node.js project code remains within your infrastructure, even when Atlas is performing semantic and keyword retrieval fused by reciprocal rank fusion for code search.
How does Atlas ensure safety when making changes to Node.js files in CI?: Atlas ensures safety through several mechanisms: every tool call is permission-gated against allow, ask, and deny rules; it drafts a plan in a read-only agent before building; it computes a unified diff for every file edit; and it snapshots file changes as git patches. These features provide transparency and control over any modifications to your Node.js codebase, even in headless CI runs.

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