# Review a pull request in Fiber with Atlas in 2026 > Atlas enhances Fiber pull request reviews by providing full file context, checking `fiber.Ctx` buffer lifetimes, and running `go test (app.Test)` to catch bugs a line-by-line diff would miss. In 2026, Atlas helps Fiber developers review pull requests by integrating directly with your `go mod` project, running `go test (app.Test)` for validation, and leveraging `gofmt` for consistent code style. Atlas goes beyond simple diffs, providing crucial context from full files and checking for common Fiber-specific issues like `fasthttp` buffer reuse, ensuring a more robust review process. ## Key takeaways - Atlas reviews Fiber pull requests by analyzing full file context, not just diff hunks. - Atlas specifically checks for `fasthttp` buffer reuse issues in `fiber.Ctx` handlers. - Atlas integrates `go test (app.Test)` and `gofmt` directly into the Fiber review workflow. - Every Atlas action in your Fiber project is permission-gated and requires explicit approval. - Atlas uses AST indexing to understand structural changes in Fiber applications. ## How Atlas reviews Fiber pull requests with full context Atlas reviews Fiber pull requests by first fetching the branch and producing a unified diff using its VCS layer, then reading the full changed files, not just hunks. This approach, crucial in 2026, ensures that surrounding context outside the immediate diff is visible, preventing bugs that a line-by-line review might miss. Atlas begins a Fiber pull request review by leveraging its integrated VCS layer to fetch the specific branch and generate a comprehensive diff. Unlike traditional tools that only show isolated hunks, Atlas uses the `bash` tool to produce the raw patch and identify changed files. Subsequently, the `read` tool pulls the complete content of these modified files. This full-file context is particularly vital in Fiber applications, where changes in one part of a `fiber.Ctx` handler or `app.Group` route might have subtle implications for adjacent code that isn't directly part of the diff. For instance, a change to a `fiber.Ctx` method might affect how other parts of the handler access request data, even if those lines aren't highlighted in the diff. Atlas's ability to index code by AST declarations using tree-sitter, rather than blind line windows, further enhances its understanding of the structural impact of changes within your `go.mod` module. This foundational step ensures that the review process starts with a holistic view of the code, mirroring how a careful human developer would approach understanding a complex change. ## Identifying Fiber-specific issues like `fasthttp` buffer reuse Atlas specifically identifies Fiber-related issues, such as `fasthttp` buffer reuse, by understanding the framework's underlying mechanics. In 2026, Atlas is configured to prompt developers to explicitly copy any `fiber.Ctx` value retained past a handler, preventing common data corruption bugs that arise from `fasthttp`'s efficient but ephemeral buffer management. Fiber's reliance on `fasthttp` for its speed introduces specific considerations, particularly regarding buffer lifetimes and `fiber.Ctx` values. Atlas is designed to understand these nuances. When reviewing a pull request, Atlas is configured to analyze `fiber.Ctx` handlers and middleware registered before `app.Listen`. If it detects a scenario where a `ctx` value might be retained past the handler's execution, Atlas will proactively ask the developer to confirm if the value should be copied. This is critical because `fasthttp` reuses underlying buffers, meaning data accessed from `ctx` after the handler returns might be corrupted or point to unexpected values. For example, if a `fiber.Ctx` value is passed to a goroutine that executes asynchronously, the original buffer might have already been reused for a new request. Atlas's awareness of these `fasthttp` gotchas helps prevent subtle, hard-to-debug issues that are unique to Fiber's high-performance architecture. This targeted analysis goes beyond generic code review, focusing on the specific pitfalls of the Fiber framework. ## Validating Fiber code changes with `go test` and `gofmt` Atlas validates Fiber code changes by integrating directly with the `go test (app.Test)` runner and enforcing `gofmt` standards. In 2026, after reviewing the diff and context, Atlas can execute `go test ./...` behind a permission prompt, ensuring that all existing tests pass and new changes adhere to the project's quality gates before approval. A crucial part of any Fiber pull request review is ensuring code correctness and consistency. Atlas integrates direct with the standard Go toolchain to achieve this. After analyzing the code changes and their context, Atlas uses the `bash` tool to run the project's tests. Specifically, it can execute `go test ./...`, which includes any `app.Test()` calls for handler validation. This step is permission-gated, meaning Atlas will ask for approval before running the tests, giving the developer full control. Test findings are then reported as a `todowrite` list, ordered by severity, making it easy to address any regressions or failures. Furthermore, Atlas understands the importance of code style in a collaborative Fiber project. Once a diff is approved, Atlas can automatically run `gofmt` on the touched files, ensuring that the code adheres to the standard Go formatting guidelines. This prevents style inconsistencies from creeping into the codebase and maintains readability across `app.Group` routes and `fiber.Ctx` handlers. Atlas's ability to connect to Model Context Protocol servers also allows it to expose these Go tools directly to the agent, streamlining the validation process. ## Atlas's safety and approval mechanisms for Fiber code reviews Atlas incorporates robust safety and approval mechanisms into every Fiber code review, ensuring developers maintain full control over changes. In 2026, every Atlas tool call is permission-gated against allow, ask, and deny rules, and it drafts a plan in a read-only agent before executing any modifications, providing 100% transparency. Developer control and safety are paramount when using an AI agent for Fiber code reviews. Atlas is built with multiple layers of approval and permission gating. Before any tool, such as `bash` to run `go test` or `gofmt`, or `lsp` to find references, is executed, Atlas checks against predefined allow, ask, and deny rules. This ensures that no action is taken without explicit or implicit developer consent. Furthermore, Atlas operates with a two-stage agent system: it first drafts a comprehensive plan in a read-only plan agent. This plan, detailing all proposed actions for the Fiber codebase, is presented to the developer for review and approval. Only after explicit approval does Atlas switch to a build agent to execute the plan. For every file edit, Atlas computes a unified diff and surfaces it for final approval before writing any changes to disk. This includes modifications to `go.mod` or `app.Group` route definitions. Atlas also snapshots file changes as git patches, allowing edits to be easily diffed and rolled back if necessary. This meticulous approach ensures that while Atlas provides powerful assistance in reviewing Fiber pull requests, the developer always retains the ultimate authority and oversight. ## Steps 1. Fetch the feature branch and generate the diff: Use Atlas's VCS layer to `bash` out the raw patch and list changed files in your Fiber module. 2. Read full Fiber files for context: Employ the Atlas `read` tool to pull the complete content of all changed `fiber.Ctx` handlers and `app.Group` route files, not just the diff hunks. 3. Check for broken references in Fiber signatures: For every changed function signature in your Fiber application, use the Atlas `lsp` tool's `findReferences` operation to identify any callers the diff might not show. 4. Grep for stale Fiber patterns: Use the Atlas `grep` tool to search for old constant names, stale copies, or feature flags that should have been updated across your Fiber codebase but were missed. 5. Run Fiber tests and report findings: With developer permission, Atlas will use `bash` to execute `go test ./...` (including `app.Test()`) and report any failures as a `todowrite` list. 6. Approve changes and format Fiber code: After reviewing Atlas's proposed diff, approve it, then let Atlas run `gofmt` on all touched Fiber files to maintain consistent style. ## FAQ ### How does Atlas handle `fasthttp` buffer reuse in Fiber reviews? Atlas is configured to recognize `fasthttp`'s buffer reuse in Fiber. It prompts developers to explicitly copy `fiber.Ctx` values if they are retained past a handler, preventing data corruption issues. ### Can Atlas run `go test` for my Fiber application? Yes, Atlas uses the `bash` tool to execute `go test ./...`, including `app.Test()` calls, for your Fiber application. This action is permission-gated and reports findings as a `todowrite` list. ### Does Atlas enforce `gofmt` for Fiber code? Absolutely. After you approve a diff, Atlas can automatically run `gofmt` on all touched files in your Fiber project, ensuring consistent code style across `app.Group` routes and `fiber.Ctx` handlers. ### How does Atlas ensure safety when modifying my Fiber codebase? Atlas employs a multi-layered safety approach. All tool calls are permission-gated, it drafts plans in a read-only agent for approval, and it presents a unified diff for every file edit before writing to your Fiber project. ### What context does Atlas use beyond the diff for Fiber reviews? Atlas uses the `read` tool to pull full file contents, not just diff hunks, providing complete surrounding context for `fiber.Ctx` handlers and `app.Group` routes. It also uses `lsp` to find references for changed signatures. ### Can Atlas detect breaking changes in Fiber function signatures? Yes, for every changed function signature in your Fiber application, Atlas uses the `lsp` tool's `findReferences` operation to check for any callers that the initial diff might not have touched, preventing unexpected breaks. ### How does Atlas understand my Fiber application's structure? Atlas indexes your Fiber code by AST declarations using tree-sitter, not blind line windows. This allows it to understand `app.Group` routes, `fiber.Ctx` handlers, and middleware structurally, providing deeper insights during review. --- Canonical HTML: https://runatlas.sh/resources/stacks/review-a-pull-request-in-fiber Source of truth: aeo_pages row `/resources/stacks/review-a-pull-request-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.