How does Atlas prevent accidental edits in my NestJS project during planning?

Atlas's `plan` agent operates in a strictly read-only mode, with permissions explicitly denying write access to all files (`*`) except for markdown files within `.atlas/plans/`. This ensures that while you research and design your NestJS multi-file change, no actual code in your `src/` directory or `nest-cli.json` can be modified.

Can Atlas understand NestJS dependency injection and module structure?

Yes, Atlas is designed to understand NestJS's core concepts. It reads your `nest-cli.json` and `app.module.ts`, comprehends `@Module` imports and exports, provider scopes, and the DTOs wired to your `ValidationPipe`. This allows Atlas to intelligently assist with changes across your NestJS application's architecture.

What NestJS tools does Atlas integrate with for multi-file changes?

Atlas integrates directly with the standard NestJS toolchain. It can build `Test.createTestingModule` harnesses and run `pnpm jest` for testing, and it can execute `pnpm prettier` to format touched NestJS providers and files, all with explicit user approval.

How do I review a multi-file change plan in NestJS with Atlas?

You review the plan by reading the markdown file you've created in `.atlas/plans/`. Once the plan is complete, you use the `plan_exit` tool. This tool asks for confirmation to switch to the build agent, effectively signaling that your plan is ready for implementation or further discussion with your team.

Where does Atlas store my NestJS change plans?

Atlas stores your change plans in markdown files within the `.atlas/plans/` directory of your NestJS project. This is the only location where the `plan` agent has write permissions, ensuring all planning documentation is centralized and version-controlled alongside your codebase.

Can Atlas help me add a new NestJS guard or interceptor?

Absolutely. Once you've transitioned from the plan agent to the build agent, you can ask Atlas to add a guard or interceptor. Atlas will then register it where it belongs within your NestJS modules, rather than just sprinkling logic in controllers, and present a diff for your approval before writing the code.

Plan a Multi-File Change Before Editing in NestJS with Atlas in 2026

Atlas empowers NestJS developers in 2026 to meticulously design multi-file changes and secure review approval before any code is modified, integrating direct with your existing toolchain like `jest`, `pnpm`, and `prettier`. This approach ensures that architectural shifts or feature additions across modules, providers, and DTOs are thoroughly vetted, preventing costly rework and maintaining code quality from the outset. By leveraging Atlas's dedicated plan agent, you can research your codebase, draft a comprehensive strategy, and get it reviewed, all within a read-only environment.

How Atlas's Plan Agent Streamlines NestJS Multi-File Changes

Atlas's dedicated plan agent provides a read-only environment for NestJS developers in 2026, ensuring that multi-file changes are designed and reviewed without accidentally modifying a single line of code. This agent's permissions explicitly deny edit access for all paths except a designated plan markdown file, offering a secure sandbox for strategic planning.

When you initiate Atlas in a NestJS project containing a `nest-cli.json` and `app.module.ts`, it automatically understands the project's structure, including `@Module` imports, exports, provider scopes, and DTOs wired to your `ValidationPipe`. The core of pre-edit planning in Atlas is its `plan` agent. This agent is specifically designed to disallow all edit tools, meaning you cannot inadvertently alter your NestJS controllers, services, or modules while in planning mode. Its permission set is strictly configured to deny write access for every path (`*`) except for files located under `.atlas/plans/*.md`. This robust permission gating ensures that your research and design phases remain entirely separate from implementation, providing a safe space to explore complex changes that might span multiple NestJS modules or impact numerous providers.

Researching NestJS Codebases with Atlas Before Editing

Before proposing any changes, NestJS developers in 2026 can leverage Atlas's powerful research tools to deeply understand their codebase. The `plan` agent allows full access to `codebase_search`, `grep`, `read`, and the `lsp` tool, providing 4 distinct methods for comprehensive code analysis without the risk of modification.

In the `plan` agent, Atlas provides a suite of tools essential for thorough codebase research. You can use `codebase_search` to semantically retrieve relevant NestJS code snippets, understanding how specific DTOs are used across different modules or how a particular guard is implemented. The `grep` tool allows for keyword-based searches, useful for finding all occurrences of a specific decorator like `@Injectable()` or a custom provider. The `read` tool lets you inspect the contents of any NestJS file, such as `src/users/users.module.ts` or `src/auth/jwt.strategy.ts`, to understand its current implementation. Furthermore, the `lsp` tool provides language server protocol capabilities, allowing you to navigate definitions, find references, and inspect types within your NestJS project, just as you would in your IDE. These tools remain fully enabled in plan mode, ensuring you have all the necessary information to design an informed, multi-file change that respects NestJS's decorator-driven dependency injection container and module architecture.

Drafting a NestJS Change Plan and Ensuring Safety

Once research is complete, NestJS developers can draft their multi-file change plan directly within Atlas, writing it to the only allowed path: `.atlas/plans/*.md`. This single write permission ensures that your proposed changes are documented in 2026 without affecting any operational NestJS code, maintaining strict separation between design and implementation.

With a solid understanding of the NestJS codebase, you can begin writing your detailed plan. This plan is documented in a markdown file, for example, `.atlas/plans/add-audit-logging.md`, which is the *only* location the `plan` agent is permitted to write. This strict permission model is a cornerstone of Atlas's safety features, guaranteeing that your design phase cannot accidentally introduce bugs or break existing functionality in your `app.module.ts` or any other NestJS component. The plan should outline the proposed changes, including which NestJS modules will be affected, new providers to be introduced, modifications to DTOs, and how existing services will be refactored. When your plan is complete and ready for review, you invoke the `plan_exit` tool. This tool prompts you with a clear question: 'Plan at <path> is complete. Would you like to switch to the build agent and start implementing?' Answering 'Yes' transitions you to the build agent, where implementation can begin, while 'No' keeps you in the plan agent to refine your strategy further, raising a `Question.RejectedError` to prevent premature implementation.

Reviewing and Approving NestJS Changes with Atlas

Atlas enhances the review process for NestJS multi-file changes by providing a unified diff for every proposed file edit, even before it's written to disk. This capability, available in 2026, allows for granular approval of changes, ensuring that modifications to your NestJS project, from `app.module.ts` to individual providers, are thoroughly vetted.

The review process with Atlas is designed for maximum transparency and control. After your plan is approved and you've switched to the build agent, any subsequent actions that would modify your NestJS codebase, such as adding a new guard or interceptor, will first generate a unified diff. This diff is surfaced for your explicit approval before Atlas writes any changes to your files. This means you can review exactly what Atlas proposes to change in your `src/main.ts`, `src/auth/auth.module.ts`, or any other file, ensuring it aligns with your approved plan. For instance, if Atlas suggests adding a new provider, you'll see the exact lines of code it intends to insert into your `@Module` decorator's `providers` array. This granular approval mechanism extends to running your NestJS test suite; Atlas can build a `Test.createTestingModule` harness and run `pnpm jest` behind a permission prompt, allowing you to verify functionality before committing. After successful implementation and testing, Atlas can also run `pnpm prettier` across touched providers, ensuring your code adheres to formatting standards, all with explicit diff review and approval.

Step by step

01Initialize Atlas in your NestJS project, ensuring `nest-cli.json` and `app.module.ts` are present for context indexing.
02Switch to the Atlas plan agent by typing `atlas plan` to enter the read-only planning environment.
03Research your NestJS codebase using Atlas tools like `codebase_search` for semantic queries, `grep` for keyword searches, `read` to inspect files like `src/users/users.service.ts`, and `lsp` for type navigation.
04Write your detailed multi-file change plan into a markdown file, for example, `.atlas/plans/feature-x-refactor.md`, outlining changes to NestJS modules, providers, and DTOs.
05Call the `plan_exit` tool when your plan is complete, which will prompt you to switch to the build agent.
06Answer 'Yes' to the `plan_exit` prompt to transition to the build agent, allowing Atlas to begin implementing your approved NestJS plan.
07Instruct Atlas to implement parts of your plan, such as adding a new NestJS guard or interceptor, and registering it correctly within your `app.module.ts` or feature modules.
08Allow Atlas to build a `Test.createTestingModule` harness and run `pnpm jest` to verify the functionality of the implemented NestJS changes.
09Review the unified diffs presented by Atlas for every file edit, such as modifications to `src/auth/auth.controller.ts` or `src/common/filters/http-exception.filter.ts`, and approve them.
10Let Atlas run `pnpm prettier` across all touched NestJS providers and files to ensure consistent code formatting before committing.

Frequently asked questions

How does Atlas prevent accidental edits in my NestJS project during planning?: Atlas's `plan` agent operates in a strictly read-only mode, with permissions explicitly denying write access to all files (`*`) except for markdown files within `.atlas/plans/`. This ensures that while you research and design your NestJS multi-file change, no actual code in your `src/` directory or `nest-cli.json` can be modified.
Can Atlas understand NestJS dependency injection and module structure?: Yes, Atlas is designed to understand NestJS's core concepts. It reads your `nest-cli.json` and `app.module.ts`, comprehends `@Module` imports and exports, provider scopes, and the DTOs wired to your `ValidationPipe`. This allows Atlas to intelligently assist with changes across your NestJS application's architecture.
What NestJS tools does Atlas integrate with for multi-file changes?: Atlas integrates directly with the standard NestJS toolchain. It can build `Test.createTestingModule` harnesses and run `pnpm jest` for testing, and it can execute `pnpm prettier` to format touched NestJS providers and files, all with explicit user approval.
How do I review a multi-file change plan in NestJS with Atlas?: You review the plan by reading the markdown file you've created in `.atlas/plans/`. Once the plan is complete, you use the `plan_exit` tool. This tool asks for confirmation to switch to the build agent, effectively signaling that your plan is ready for implementation or further discussion with your team.
Does Atlas run `jest` tests for NestJS changes?: Yes, after you've approved the switch to the build agent and Atlas begins implementing changes, it can build a `Test.createTestingModule` harness and run `pnpm jest` behind a permission prompt. This allows you to verify the functionality of the proposed NestJS changes before they are committed.
Where does Atlas store my NestJS change plans?: Atlas stores your change plans in markdown files within the `.atlas/plans/` directory of your NestJS project. This is the only location where the `plan` agent has write permissions, ensuring all planning documentation is centralized and version-controlled alongside your codebase.
Can Atlas help me add a new NestJS guard or interceptor?: Absolutely. Once you've transitioned from the plan agent to the build agent, you can ask Atlas to add a guard or interceptor. Atlas will then register it where it belongs within your NestJS modules, rather than just sprinkling logic in controllers, and present a diff for your approval before writing the code.

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