Atlas helps PowerShell developers in 2026 build a working mental model of unfamiliar repositories without reading every file by leveraging its semantic index, glob maps, and targeted file reads. It integrates directly with your PowerShell toolchain, including `Pester` for testing and `PSResourceGet` for package management, ensuring a familiar and efficient onboarding experience.
How Atlas uses semantic search to understand PowerShell modules
In 2026, Atlas helps PowerShell developers quickly grasp unfamiliar codebases by starting from meaning, not just filenames. Its `codebase_search` tool queries a semantic index built from your `.psm1` module files and `param` blocks, returning ranked snippets that directly answer your plain-language questions about functionality.
Atlas indexes PowerShell code by AST declarations using tree-sitter, moving beyond blind line windows. This allows `codebase_search` to perform hybrid semantic and keyword retrieval, fused by reciprocal rank fusion, to find relevant code snippets. For a PowerShell developer, this means asking "how requests are authenticated" and receiving precise results from within `.psm1` files, even if the relevant logic is spread across advanced functions or module manifests. Atlas can build this code index with local Ollama embeddings, ensuring your proprietary PowerShell code remains off third-party servers. This initial step provides a high-level understanding of core concepts without requiring a full codebase read.
Exploring PowerShell module structure and dependencies with Atlas
After an initial semantic search, Atlas helps PowerShell developers in 2026 map out the repository's structure using the `glob` tool. This reveals the top-level directories and naming conventions, such as where `.psm1` module files or `.psd1` manifest files reside, before any deep dive into individual scripts.
Once `codebase_search` provides initial insights, Atlas guides you through the codebase's physical layout. The `glob` tool allows you to inspect the directory shape, identifying common PowerShell patterns like `Modules/MyModule.psm1` or `Tests/MyModule.Tests.ps1`. Following this, the `read` tool pulls only the two or three files `codebase_search` ranked highest, focusing your attention on the most critical components. For deeper understanding, the `lsp` tool's `goToDefinition` operation allows you to follow imports and function calls within PowerShell scripts, tracing the flow of execution and dependencies between advanced functions and cmdlets without manually searching through files. This targeted approach prevents information overload, a common challenge when onboarding to large PowerShell projects.
Delegating wide sweeps to the Atlas explore subagent for PowerShell
To efficiently conduct wider sweeps across an unfamiliar PowerShell codebase, Atlas in 2026 delegates heavy fan-out work to the `explore` subagent. This specialized subagent operates with a deny-by-default permission set, ensuring it can only `grep`, `glob`, `read`, `bash`, `webfetch`, and `websearch` without making any modifications to your `.ps1` files.
The `explore` subagent is crucial for comprehensive, yet safe, investigation of a PowerShell repository. When you need to understand how a specific cmdlet is used across multiple modules or identify all instances of a particular `param` block attribute, the `task` tool can delegate this to the `explore` subagent. Its read-only nature means it cannot accidentally modify any `.psm1` or `.psd1` files while it looks around. This allows you to ask broad questions, like "find all functions that use `SupportsShouldProcess`" or "list all `Pester` test files," and receive aggregated results without risk. The `explore` subagent can run in the foreground or in parallel background sessions, accelerating your understanding of the codebase's breadth and depth.
Ensuring safety and review when onboarding to PowerShell with Atlas
Atlas prioritizes safety and developer control throughout the onboarding process for PowerShell codebases in 2026. Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs, and it drafts a plan in a read-only plan agent, asking for approval before switching to a build agent that can modify `.ps1` files.
When Atlas proposes changes, such as adding `CmdletBinding` to a function or clearing `PSScriptAnalyzer` warnings, it computes a unified diff for every file edit. This diff is surfaced for your approval before Atlas writes any changes to your PowerShell scripts. This granular control extends to running tests; Atlas will let you run `Invoke-Pester` behind a permission prompt before it commits any changes to `.Tests.ps1` files. Furthermore, Atlas snapshots file changes as git patches, allowing edits to be easily diffed and rolled back if needed. To consolidate your findings and remaining questions, the `todowrite` tool allows you to record what you learned as a list, ensuring open questions survive into the next turn and providing a clear path forward for your PowerShell onboarding journey.
Step by step
- 01Run `atlas` in your PowerShell module directory where `.psm1` and `.psd1` files live.
- 02Ask Atlas: "how are requests authenticated in this PowerShell module?" using `codebase_search` to query the semantic index.
- 03Run `glob` on the top-level directories to inspect the package layout and identify `.psm1` and `.psd1` files.
- 04`read` the two or three `.psm1` files `codebase_search` ranked highest, then use `lsp goToDefinition` to follow imports and function calls.
- 05Delegate a wide sweep to the `explore` subagent via the `task` tool, asking it to "find all `Pester` test files" or "list all functions using `SupportsShouldProcess`."
- 06Record your findings and any open questions as a `todowrite` list, noting specific PowerShell cmdlets or module behaviors.
- 07If Atlas proposes a change, like running `PSScriptAnalyzer Invoke-Formatter` or adding `CmdletBinding`, review the unified diff and approve the edit.
Frequently asked questions
- How does Atlas understand my PowerShell module code?
- Atlas indexes your PowerShell code by AST declarations using tree-sitter, not blind line windows. It understands `.psm1` module files, exported cmdlets, and `param` blocks, allowing `codebase_search` to perform semantic queries.
- Can Atlas help me find all Pester tests in a new PowerShell repository?
- Yes, you can delegate this to the `explore` subagent using the `task` tool. It can `glob` and `grep` for `.Tests.ps1` files or specific `Describe` blocks, providing a comprehensive list without modifying anything.
- How does Atlas ensure it doesn't break my PowerShell scripts?
- Atlas operates with permission-gated tool calls and drafts plans in a read-only agent. Every file edit generates a unified diff for your approval before writing, and changes are snapshotted as git patches for easy rollback.
- Does Atlas integrate with PowerShell's built-in formatting and linting tools?
- Yes, Atlas can clear `PSScriptAnalyzer` warnings and run `PSScriptAnalyzer Invoke-Formatter` over proposed diffs, ensuring your PowerShell code adheres to style guidelines before committing.
- Can Atlas help me understand PowerShell module dependencies?
- Absolutely. After initial `codebase_search` results, you can use `lsp goToDefinition` to follow function calls and module imports within `.psm1` files, mapping out dependencies efficiently.
- How does Atlas handle sensitive PowerShell code when building its index?
- Atlas can build its code index with local Ollama embeddings, keeping your PowerShell code off third-party servers and ensuring data privacy for your proprietary scripts.
- What if I need to explore a large PowerShell codebase without making changes?
- The `explore` subagent is designed for this. It's permissioned read-only, allowing it to `grep`, `glob`, `read`, `bash`, `webfetch`, and `websearch` across your PowerShell repository without any risk of modification.
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