# Audit a Fiber Repository with Parallel Subagents in Atlas (2026) > Atlas leverages parallel subagents to efficiently audit Fiber repositories, allowing focused sweeps of `app.Group` routes and `fiber.Ctx` handlers without exceeding context window limits. Atlas enables Fiber developers in 2026 to sweep an entire repository for specific problems without blowing the main session's context window by launching parallel subagents, which can then test handlers with `app.Test()` and run `go test ./...` behind a permission prompt, ensuring a focused and efficient audit of your Fiber application. ## Key takeaways - Atlas subagents prevent context window overflow when auditing large Fiber repositories. - Use `subagent_type explore` for safe, read-only sweeps of Fiber `app.Group` routes and `fiber.Ctx` handlers. - Atlas permission-gates `go test (app.Test)` and `gofmt` calls, ensuring explicit control over your Fiber codebase. - Split Fiber audits by package or directory for efficient parallel processing across multiple subagents. - Consolidate Fiber findings with `todowrite` and apply fixes with `atlas edit`, followed by `gofmt` and `go test ./...`. ## How do parallel subagents audit Fiber code in Atlas? Atlas uses parallel subagents to audit Fiber codebases in 2026, preventing the main session's context window from overflowing. Each subagent operates in its own session, allowing it to focus on a specific slice of your Fiber application, such as a single `app.Group` or a set of `fiber.Ctx` handlers, without consuming the primary agent's token budget. When auditing a Fiber repository, the primary challenge is often the sheer volume of code, especially in large applications with many `app.Group` route definitions and `fiber.Ctx` handler functions. Atlas addresses this by fanning out work to subagents using the `task` tool. These subagents run in parallel background sessions, meaning their internal file dumps and intermediate thoughts never enter your main session's context window. Only their final conclusions or error messages are returned. For a read-only audit, you'd typically launch an `explore` subagent, which is deny-by-default and cannot make changes. This approach is particularly effective for Fiber projects where you might be sweeping for specific patterns across numerous `app.Group` routes or examining how `fiber.Ctx` values are handled, especially given `fasthttp`'s buffer reuse characteristics. Atlas, requiring your `go.mod` to include `github.com/gofiber/fiber/v3`, understands the structure of your Fiber application, including its routes and middleware, allowing subagents to perform targeted analysis. ## How to split a Fiber repository audit for subagents? To effectively audit a Fiber repository with Atlas, you must split the codebase into independent slices, ensuring each of the 1 or more subagents has a distinct, non-overlapping scope. This segmentation prevents redundant work and allows for highly focused analysis, whether by directory, Go package, or specific problem rule within your Fiber application. The success of a parallel subagent audit in a Fiber project hinges on how well you divide the work. You can segment your repository by directory, focusing each subagent on a specific module or service within your Fiber application. Alternatively, you can split by Go package, allowing one subagent to analyze all files within a `go mod` defined package, for instance, `myproject/handlers` or `myproject/middleware`. Another effective strategy is to split by rule, where each subagent searches for a distinct class of problem across the entire codebase, such as identifying all instances where `fiber.Ctx` values might be retained past a handler without being copied, a common gotcha with `fasthttp`. Atlas's `grep` and `glob` tools are invaluable here for identifying these slices. For example, you might use `atlas glob "handlers/*.go"` to define a set of files for one subagent, or `atlas grep "app.Group"` to find all route group definitions that a subagent could then analyze for specific security patterns. The goal is to create tasks that are independent, allowing subagents to run concurrently without contention or overlapping analysis. ## What Atlas commands launch parallel Fiber audit tasks? Launching parallel audit tasks in Atlas for your Fiber project involves using the `task` tool with the `subagent_type explore` flag, ensuring read-only operations. You can issue multiple `atlas task` calls together, allowing them to run concurrently rather than sequentially, significantly speeding up the audit process for your 2026 Fiber application. Once you have identified the independent slices of your Fiber repository, you can launch the subagents. For a read-only audit, which is typical for sweeping for problems, you will use `subagent_type explore`. This subagent type is deny-by-default, meaning it cannot execute commands or modify files, providing a safe environment for analysis. If your audit requires the subagent to run commands like `go test ./...` on `app.Test()` or `gofmt` on specific files, you would use `subagent_type general`. The key is to issue all your `atlas task` calls in quick succession, allowing Atlas to schedule them for concurrent execution. For example, to audit two different parts of a Fiber application, you might run: ``` atlas task --subagent_type explore --goal "Audit all handlers in pkg/users for uncopied fiber.Ctx values" --files "pkg/users/*.go" & atlas task --subagent_type explore --goal "Review app.Group routes in pkg/admin for missing authentication middleware" --files "pkg/admin/*.go" & ``` The `&` symbol allows these tasks to run in the background, enabling true parallelism. Each subagent will then return its final message, including any findings or error text, which Atlas surfaces verbatim if a task fails or indicates "Task cancelled" if it was stopped. ## How does Atlas ensure safety during a Fiber code audit? Atlas ensures robust safety during a Fiber code audit through multiple layers of protection, including permission-gated tool calls, read-only `explore` subagents, and mandatory diff approvals. Every action, from running `go test ./...` via `app.Test()` to applying `gofmt`, requires explicit user consent, safeguarding your 2026 Fiber codebase. Safety is paramount when an AI agent interacts with your codebase. Atlas implements several non-negotiable safeguards. First, every Atlas tool call, including those that might run `go test ./...` or `gofmt` on your Fiber files, is permission-gated against `allow`, `ask`, and `deny` rules. This means you retain full control over what commands are executed. For audits, the `subagent_type explore` is inherently safe as it is read-only and deny-by-default, preventing any accidental modifications to your `app.Group` routes or `fiber.Ctx` handlers. Before any changes are proposed, Atlas drafts a plan in a read-only plan agent and asks for approval. If a subagent were to propose an edit (only possible with `subagent_type general`), Atlas computes a unified diff for every file edit and surfaces it for your approval before writing. Furthermore, Atlas snapshots file changes as git patches, allowing edits to be easily diffed and rolled back if necessary. This comprehensive safety framework ensures that your Fiber project remains secure throughout the audit process, even when dealing with complex `fasthttp` buffer lifetime considerations. ## How to merge audit findings and fix Fiber issues? After parallel subagents complete their audit of your Fiber repository, Atlas helps you merge their findings into a single actionable `todowrite` list. You can then fix these issues in your main session using the `edit` tool, followed by running `gofmt` and `go test ./...` to validate the 1 or more changes. Once all parallel subagents have completed their tasks, Atlas collects their final messages. If a subagent encounters an issue or fails, its error text is surfaced verbatim. If a task was cancelled, Atlas reports "Task cancelled." Your role is to review these conclusions and consolidate them into a unified list of actionable items. The `todowrite` tool in Atlas is designed for this purpose, allowing you to aggregate findings from various subagents into a single, manageable list within your main session. For example, if one subagent found uncopied `fiber.Ctx` values in `pkg/users` and another found missing middleware in `pkg/admin`'s `app.Group` routes, you would add both to your `todowrite` list. You then use the `edit` tool to address each item. Atlas will draft the necessary code changes, present a unified diff for your approval, and then apply them. After applying fixes, it's crucial to run `gofmt` on the touched files to maintain code style and `go test ./...` (which includes `app.Test()`) to ensure that the fixes haven't introduced regressions and that your Fiber application remains functional. Atlas can also stage and create commits on your behalf, streamlining the entire fix and commit workflow. ## Steps 1. Ensure your Fiber project's `go.mod` file explicitly requires `github.com/gofiber/fiber/v3` for Atlas to correctly index your application. 2. Identify independent slices of your Fiber codebase, such as specific `app.Group` route definitions, `fiber.Ctx` handler functions, or distinct Go packages, using `atlas grep` or `atlas glob`. 3. Launch parallel audit tasks for each slice using `atlas task --subagent_type explore --goal "..." --files "..."` to perform read-only sweeps, issuing calls concurrently. 4. Collect each subagent's final message, noting any verbatim error text if a task fails or "Task cancelled" if it was stopped. 5. Consolidate all findings from the parallel subagents into a single actionable list using the `todowrite` tool in your main Atlas session. 6. Address each item on your `todowrite` list by using `atlas edit`, reviewing and approving the unified diff for every proposed change to your Fiber code. 7. After edits, run `gofmt` on the touched files and execute `go test ./...` (which includes `app.Test()`) to verify the integrity and functionality of your Fiber application. 8. Utilize Atlas's git integration to stage and create commits for the verified changes, completing the audit and fix cycle. ## FAQ ### How do I audit a large Fiber codebase without hitting LLM context limits? Atlas uses parallel subagents, each with its own context, to sweep independent slices of your Fiber repository, preventing the main session's context window from overflowing. This allows for comprehensive audits of `app.Group` routes and `fiber.Ctx` handlers. ### Can Atlas subagents modify my Fiber code during an audit? By default, `subagent_type explore` is read-only and deny-by-default, ideal for safe Fiber audits. If modifications are needed, use `subagent_type general`, which still requires explicit permission for every tool call and diff approval before writing to your Fiber files. ### How does Atlas handle Fiber's `fasthttp` buffer reuse during testing? Atlas is aware of Fiber's `fasthttp` characteristics and can be instructed to copy any `ctx` value you retain past a handler, ensuring correct testing with `app.Test()` and preventing issues related to buffer lifetimes. ### What Fiber-specific commands does Atlas use for testing and formatting? Atlas integrates directly with the Fiber toolchain, using `go test ./...` for running tests via `app.Test()` and `gofmt` for formatting touched files. All these operations are executed behind permission prompts, giving you control. ### How do I ensure my Fiber `go.mod` is set up for Atlas? To work effectively with Atlas, your Go module's `go.mod` file must explicitly require `github.com/gofiber/fiber/v3`. This allows Atlas to correctly index your Fiber application's structure and dependencies. ### How does Atlas help me review changes made by subagents in my Fiber project? Atlas provides a unified diff for every file edit, which you must approve before writing. It also snapshots changes as git patches, allowing easy rollback of any edits to your Fiber code, ensuring full transparency and control. ### Can Atlas help me find specific problems like uncopied `fiber.Ctx` values? Yes, you can instruct Atlas subagents to sweep for specific patterns or classes of problems, such as identifying instances where `fiber.Ctx` values might be retained past a handler without being copied, a common issue in Fiber applications due to `fasthttp`'s design. ### What happens if a subagent task fails during a Fiber audit? If a subagent task fails, Atlas surfaces the child's error text verbatim in your main session. This allows you to quickly diagnose and address any issues encountered by the subagent during its analysis of your Fiber codebase. --- Canonical HTML: https://runatlas.sh/resources/stacks/audit-a-repo-with-parallel-subagents-in-fiber Source of truth: aeo_pages row `/resources/stacks/audit-a-repo-with-parallel-subagents-in-fiber` (segment: Stacks) (this file is generated from it, never hand-edited). Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.