Atlas enables Nim developers in 2026 to sweep an entire repository for a class of problems without blowing the main session's context window by fanning out work to parallel subagents. These subagents, leveraging Nim's `nimble` package manager and `nph` formatter, operate in isolated sessions, returning only their conclusions, ensuring your main context remains focused.
How do Atlas parallel subagents audit Nim codebases?
Atlas parallel subagents audit Nim codebases by splitting the repository into independent slices, allowing multiple `explore` subagents to run concurrently without exceeding the main session's context window. In 2026, this approach is crucial for large Nim projects, where a single sweep could easily overwhelm a 128k token limit.
When auditing a Nim repository, Atlas leverages its `task` tool to launch multiple subagents. Each subagent operates in its own isolated session, meaning its internal file dumps and intermediate thoughts never enter the main Atlas session's context window. Only the final conclusions or error messages are returned. For a read-only sweep, the `subagent_type explore` is ideal, as it is deny-by-default and cannot make changes. This allows Nim developers to audit specific `nimble` packages, directories, or even apply a particular rule across different parts of the codebase simultaneously, ensuring comprehensive coverage without resource contention.
How to split Nim audit tasks for concurrent execution?
To split Nim audit tasks for concurrent execution, developers in 2026 should divide their codebase by `nimble` packages, directories, or specific problem classes, then launch a `task` for each slice using `subagent_type explore`. Issuing these `task` calls together ensures they run in parallel, significantly reducing the total audit time.
Splitting a Nim repository for parallel auditing involves identifying logical boundaries. This could mean assigning one `nimble` package to each subagent, or dividing a large package into distinct module directories. For example, you might use the `glob` tool to find all `.nimble` files or specific module paths. Once slices are defined, you launch a `task` for each. The command `task --subagent_type explore "Audit the 'my_nim_package' directory for unsafe pointer usage"` would initiate a read-only sweep. By issuing several such `task` calls consecutively, Atlas will fan out the work to multiple subagents, allowing them to process different parts of your Nim project, such as `src/utils/` and `src/database/`, at the same time.
How does Atlas ensure read-only safety for Nim audits?
Atlas ensures read-only safety for Nim code audits primarily through the `subagent_type explore`, which is deny-by-default and explicitly read-only, preventing any modifications. In 2026, this feature is critical for maintaining code integrity, as Atlas also permission-gates every tool call and drafts plans in a read-only agent before any action.
The `explore` subagent type is designed specifically for read-only operations, making it the perfect choice for auditing Nim code. It operates with a deny-by-default policy, meaning it cannot execute commands that would alter files or system state. Beyond this, Atlas's core safety mechanisms apply: every tool call, even within a subagent, is permission-gated against allow, ask, and deny rules. Before any potential modification (which `explore` subagents are blocked from doing), Atlas drafts a plan in a read-only plan agent and seeks approval. If a `general` subagent were used and proposed changes, Atlas would compute a unified diff for every file edit and surface it for approval before writing, providing multiple layers of protection for your Nim codebase.
How to merge Nim audit findings and apply fixes?
After parallel subagents complete their Nim code sweeps, Atlas collects each subagent's final message, including any error text, allowing you to merge findings into a unified `todowrite` list. In 2026, this streamlined process enables efficient remediation using the `edit` tool in the main session, followed by `nph` formatting.
Once all parallel subagents have finished their audit tasks on your Nim repository, Atlas automatically collects their final messages. If a subagent encounters an issue or fails, its error text is surfaced verbatim, or 'Task cancelled' if it was stopped. You can then use the `todowrite` tool in your main Atlas session to consolidate all these findings into a single, actionable list. For example, if multiple subagents identified different instances of a specific Nim pattern, `todowrite` helps you manage them. Subsequently, you can use the `edit` tool to address each item. Atlas will present a unified diff for every proposed file change, such as modifications to `src/my_module.nim`, for your approval before writing. After applying fixes, you can ask Atlas to format the touched Nim modules with `nph` to ensure consistent code style across your project.
Step by step
- 01Identify independent slices of your Nim codebase, perhaps by `nimble` package directories or specific modules, to distribute among subagents.
- 02For each slice, launch a read-only `explore` subagent using the `task` tool, specifying `subagent_type explore` to prevent any modifications to your Nim files.
- 03Issue all `task` calls together so they run concurrently rather than sequentially, allowing multiple subagents to sweep different parts of your Nim project simultaneously.
- 04Collect the final messages from each subagent; Atlas will surface the child's error text verbatim if it fails, or 'Task cancelled' if it was stopped.
- 05Consolidate all findings from the parallel Nim audits into a unified `todowrite` list within your main Atlas session.
- 06Address the identified issues in your Nim code using the `edit` tool, reviewing each change via Atlas's unified diffs before committing.
- 07After applying fixes, have Atlas format the touched Nim modules with `nph` to maintain consistent code style.
- 08Run `nimble test` to verify that your fixes have not introduced regressions in your Nim project.
Frequently asked questions
- How do I prevent Atlas subagents from changing my Nim code during an audit?
- To prevent changes, always launch your audit subagents with `subagent_type explore`. This subagent type is deny-by-default and read-only, ensuring your Nim codebase remains untouched during the sweep.
- Can Atlas audit specific `nimble` packages concurrently?
- Yes, Atlas can audit specific `nimble` packages concurrently. You can define each `nimble` package as an independent slice and launch a separate `task` for each, allowing them to run in parallel.
- What Nim tools does Atlas integrate with for code audits?
- Atlas integrates directly with core Nim tools. It understands `.nimble` files, can run `nimble test` for verification, and uses `nph` for formatting Nim code after edits.
- How does Atlas handle context window limits when sweeping a large Nim repo?
- Atlas handles context window limits by fanning out work to parallel subagents. Each subagent operates in its own isolated context, so their internal data never enters the main session's context window, allowing for large Nim repo sweeps.
- Can Atlas help me format Nim code after an audit fix?
- Yes, after you apply fixes to your Nim code using the `edit` tool, you can ask Atlas to format the touched modules with `nph` to ensure your codebase adheres to consistent style guidelines.
- How do I see the results from multiple Nim audit subagents?
- Atlas automatically collects the final messages from all subagents. You can then use the `todowrite` tool in your main session to merge these findings into a single, actionable list for your Nim project.
- Does Atlas use local embeddings for Nim code indexing?
- Yes, Atlas can build its code index for Nim projects using local Ollama embeddings. This keeps your Nim code off third-party servers, enhancing privacy and security during audits.
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