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Document an Assembly Module with a README in 2026 using Atlas

Updated 7 min read

Atlas helps Assembly developers in 2026 produce accurate README documentation for modules by reading the actual source code, not outdated specifications. It integrates directly with your existing `make check` test runner, `make (nasm toolchain)` package manager, and `asmfmt` formatter to ensure every claim in your documentation is traceable to the current implementation of your x86-64 or ARM64 Assembly code.

How Atlas Documents Assembly Modules in 2026

In 2026, Atlas documents Assembly modules by directly inspecting the source code, ensuring the README reflects the current implementation rather than outdated specifications. It uses the `lsp` tool's `documentSymbol` operation to enumerate public APIs, guaranteeing no export is missed from your `.asm` or `.S` files.

Atlas leverages its `lsp` tool to perform a `documentSymbol` operation on your Assembly source files, such as `my_module.asm` or `kernel_entry.S`. This operation precisely identifies all public labels, functions, and data structures that constitute the module's external API. Unlike traditional documentation methods that might rely on stale comments or external specifications, Atlas reads the actual x86-64 or ARM64 Assembly code. After enumerating the public surface, Atlas uses its `read` tool to analyze the implementation of each identified export. It then employs `codebase_search` to find real-world usage patterns within your repository, observing how other parts of your system interact with the module. This approach ensures that the generated documentation accurately describes the module's behavior and its practical application, including specific register allocations, calling conventions (System V or AAPCS64), and ABI contracts. The goal is to produce a README that is traceable to the current codebase, providing a reliable reference for any Assembly developer.

Integrating Atlas with Assembly Toolchains: `make check`, `nasm`, `asmfmt`

Atlas integrates direct with your existing Assembly development environment, recognizing your `Makefile` and source files like `my_routine.asm`. It can assemble your code using `nasm` or the GNU assembler and verify documentation examples by running them under `make check`, ensuring 100% accuracy for code snippets.

Atlas is designed to work within your established Assembly workflow. When you run Atlas in a directory containing your `.asm` or `.S` sources and `Makefile`, it automatically detects your project structure. For documentation, Atlas can verify code samples by executing them. After generating a README, Atlas uses its `bash` tool to run any embedded code examples, such as a snippet demonstrating how to call a specific Assembly routine. These examples are executed within your project's test harness, typically invoked via `make check`. This rigorous verification process ensures that every code sample in the generated README is functional and accurately reflects the current state of your x86-64 or ARM64 Assembly code. Furthermore, Atlas respects your project's formatting standards. If it modifies any Assembly files during a documentation task, it will ensure consistency by applying `asmfmt` to the touched files, maintaining your preferred alignment and column style. This integration means Atlas acts as an intelligent assistant, not an intrusive external tool.

Ensuring Accuracy and Safety in Assembly Documentation with Atlas

Atlas prioritizes accuracy and safety when generating READMEs for Assembly modules, especially concerning critical x86-64 and ARM64 code. Before any changes are written, Atlas computes a unified diff for every file edit and surfaces it for approval, giving you 100% control over the final output.

The core principle behind Atlas's documentation generation for Assembly is traceability and user control. Atlas drafts a comprehensive plan in a read-only plan agent, outlining the steps it will take to generate the README. This plan is presented to you for approval before any actions are executed. for writing the README, Atlas uses the `write` tool, quoting real signatures and real file paths directly from your `.asm` or `.S` sources. This ensures that the documentation is not only accurate but also verifiable against the actual codebase. Every Atlas tool call, including `read`, `codebase_search`, `grep`, `write`, and `bash`, is permission-gated against `allow`, `ask`, and `deny` rules. This means you are always prompted before Atlas performs any potentially modifying action or executes a command like `make check`. Before writing the final README or making any other file changes, Atlas computes a unified diff. This diff is presented to you for explicit approval, allowing you to review every proposed change line by line. This robust review mechanism, combined with Atlas's ability to snapshot file changes as git patches for easy rollback, ensures that documentation updates are precise, safe, and fully under your control, especially when dealing with the intricate details of Assembly code.

Step-by-Step Workflow: Documenting an Assembly Module with Atlas

The workflow for documenting an Assembly module with Atlas involves 5 key steps, starting with enumerating the public API. Atlas ensures that the generated README accurately reflects the current state of your x86-64 or ARM64 code, integrating directly with your `Makefile` and source files.

The process begins by running Atlas in your project directory where your `.asm` or `.S` sources and `Makefile` reside. Atlas first uses the `lsp` tool's `documentSymbol` operation to identify all public labels and routines within your Assembly module, ensuring a complete enumeration of the module's external interface. Next, it employs the `read` tool to analyze the implementation details of each identified export, understanding its behavior, register usage, and adherence to calling conventions like System V or AAPCS64. To provide practical context, Atlas then uses `codebase_search` to find examples of how these exports are actually used by callers within your repository. Before writing, Atlas uses `grep` to locate any existing `README.md` files to match the established heading structure and tone, preventing the creation of a new, inconsistent format. Finally, the `write` tool generates the new or updated README, incorporating real signatures, file paths, and verified code samples. Throughout this process, Atlas ensures that every claim is traceable to the source, providing documentation that describes what the Assembly code *actually does* today.

Step by step

  1. 01Run Atlas in your Assembly project directory, ensuring your `.asm` or `.S` sources and `Makefile` are present.
  2. 02Ask Atlas to enumerate the module's public API using the `lsp` tool's `documentSymbol` operation to identify all exported labels and routines.
  3. 03Instruct Atlas to `read` the implementation of each identified export and use `codebase_search` to find how callers actually use it in practice within your x86-64 or ARM64 codebase.
  4. 04Have Atlas `grep` your repository for an existing `README.md` to match its heading structure and tone, ensuring consistency.
  5. 05Approve Atlas's plan to `write` the new or updated `README.MD`, which will include real Assembly signatures and file paths.
  6. 06Verify every code sample in the generated `README.md` by allowing Atlas to execute them with `bash` under your `make check` test harness.
  7. 07Review the unified diff presented by Atlas for the `README.md` and any other touched files, then approve the changes.
  8. 08If Atlas modified any Assembly source files, confirm it applies `asmfmt` to keep alignment and column style consistent.

Frequently asked questions

How does Atlas ensure Assembly READMEs are up-to-date in 2026?
Atlas ensures Assembly READMEs are current by reading the actual `.asm` or `.S` source files and analyzing their runtime behavior, rather than relying on outdated comments or specifications. It uses `lsp` to enumerate the public API and `read` to understand implementation details.
Can Atlas document specific Assembly calling conventions like System V or AAPCS64?
Yes, Atlas is designed to understand and document specific Assembly calling conventions such as System V for x86-64 and AAPCS64 for ARM64, including register allocation and ABI contracts, directly from your source code.
How does Atlas verify code examples in an Assembly README?
Atlas verifies code examples in an Assembly README by using its `bash` tool to execute them within your project's test harness, typically invoked via `make check`. This ensures every sample is functional and accurate.
Does Atlas integrate with my existing Assembly build system and formatter?
Yes, Atlas integrates with your existing Assembly build system by recognizing your `Makefile` and can use `nasm` or the GNU assembler. It also ensures consistency by applying `asmfmt` to any touched Assembly files.
What safety measures does Atlas have for modifying Assembly documentation?
Atlas employs robust safety measures, including a read-only plan agent for approval, permission-gated tool calls, and presenting a unified diff for every proposed change to the `README.md` or source files before writing.
Can Atlas help me understand register usage in a hot Assembly loop?
Yes, Atlas can explain a hot Assembly loop and annotate register usage before suggesting any changes, helping you understand the intricate details of your x86-64 or ARM64 code.
How does Atlas handle existing README files when generating new documentation for Assembly?
Atlas uses `grep` to find existing `README.md` files in your repository. It then matches their heading structure and tone to ensure consistency and avoid inventing a new, disparate format for your Assembly module documentation.

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