How does Atlas detect a hanging `cargo build` in Axum?

Atlas's `bash` tool races every command against a timeout. If the command exceeds this, Atlas analyzes the process state to determine if it's waiting for interactive input or simply slow, providing a clear diagnosis in the `shell_metadata`.

What if my `cargo nextest run` is genuinely slow, not blocked, in an Axum project?

If Atlas's `shell_metadata` indicates a 'command timed out', it means your `cargo nextest run` is genuinely slow. You can then re-run `atlas bash` with a larger `--timeout` value, specified in milliseconds, to accommodate the longer execution time required for your Axum tests.

Can Atlas help with `rustfmt` hanging on a large Axum codebase?

While `rustfmt` typically doesn't hang, if it were to, Atlas would diagnose it similarly to any other command. For large Axum codebases, if `rustfmt` takes longer than the default timeout, you might increase the `atlas bash` timeout to allow it to complete.

How does Atlas ensure safety when modifying my Axum project's code?

Atlas operates with permission-gated tool calls, drafts plans in a read-only agent, and presents a unified diff for every proposed change to your Axum handlers, `Cargo.toml`, or other files before writing. This ensures you have full control and visibility over all modifications.

What are common reasons for `cargo` commands to hang in Axum projects?

The most common reason is silently blocked interactive input, where `cargo` or a script expects user confirmation but isn't getting it in a non-interactive environment. Atlas explicitly identifies this, allowing you to use flags like `--no-input` to resolve it.

Does Atlas integrate with `cargo`'s dependency management for Axum?

Yes, Atlas can execute any `cargo` command, including those for dependency management. If a `cargo update` or `cargo add` command were to hang, Atlas would diagnose it, and any proposed changes to your `Cargo.toml` would be presented for your review.

Diagnose a Hanging or Long-Running Command in Axum with Atlas in 2026

Atlas helps Axum developers in 2026 quickly diagnose whether a `cargo` build, `cargo nextest` run, or custom script is genuinely slow or silently blocked on interactive input. By running commands through Atlas's `bash` tool, you receive immediate feedback, allowing you to unblock your Rust development workflow efficiently and get your Axum services running.

How Atlas Diagnoses Hanging Axum Commands

Atlas provides a clear diagnosis for hanging `cargo` commands in Axum projects by racing every command against a timeout, a feature critical for modern Rust development in 2026. When a command, such as `cargo nextest run`, exceeds its allotted time, Atlas's `bash` tool captures the event and provides specific `shell_metadata`.

When you execute an Axum-related command like `cargo build` or `cargo nextest run` through `atlas bash`, Atlas monitors its execution. If the command does not complete within the default or specified timeout, Atlas does not just kill it; it analyzes the state. The `shell_metadata` block in Atlas's output will explicitly state whether the command was 'blocked on interactive input' or 'command timed out'. This distinction is crucial for Axum developers, as a silent prompt from `cargo` or a custom build script can halt progress indefinitely, while a genuine timeout indicates a need for more resources or a longer execution window. This precise diagnosis prevents wasted time guessing the root cause of a stalled Axum development task.

Identifying Interactive Input Blocks in Axum Workflows

The most common reason for a `cargo` command to appear 'stuck' in an Axum project is a silent prompt for interactive input, a scenario Atlas explicitly identifies in 1 out of 2 diagnoses. This often occurs when `cargo` or a custom script expects user confirmation, but the environment provides no input, leading to an indefinite wait.

Axum projects, like any Rust application, rely heavily on `cargo` for building, testing, and managing dependencies. Sometimes, `cargo` or a script invoked during a build or test run (e.g., `cargo nextest run`) might attempt to prompt the user for input, such as confirming a dependency update or a configuration choice. In a non-interactive environment, this prompt goes unanswered, and the process silently blocks. Atlas's `shell_metadata` will clearly report 'blocked on interactive input'. To resolve this, Axum developers should re-run the command with non-interactive flags. For `cargo`, common flags include `--no-input` or `-y` (for 'yes'). For example, `atlas bash "cargo build --no-input"` ensures the build proceeds without waiting for user interaction, unblocking your Axum development.

Adjusting Timeouts for Genuinely Slow Axum Processes

If Atlas's diagnosis indicates a 'command timed out' rather than an interactive input block, it means your Axum build or test run is genuinely slow, requiring more than the default 5 seconds. This is common for complex `cargo nextest` suites or large `cargo build` operations in 2026.

For Axum projects with extensive test suites managed by `cargo nextest` or large codebases requiring significant compilation time, a `cargo build` or `cargo nextest run` command might genuinely take a long time to complete. If Atlas reports a 'command timed out', it means the process was still actively working but simply exceeded the allocated time. In this scenario, the solution is to increase the timeout value for the `atlas bash` command. Atlas allows you to specify the timeout in milliseconds. For instance, if your `cargo nextest run` typically takes 30 seconds, you might run `atlas bash --timeout 60000 "cargo nextest run"` to give it a full minute (60,000 milliseconds) to complete. This ensures that genuinely long-running but productive tasks in your Axum workflow are not prematurely terminated.

Atlas's Safety and Review for Axum Codebases

Atlas prioritizes safety and transparency when interacting with your Axum codebase, ensuring every proposed change, from `rustfmt` adjustments to `Cargo.toml` modifications, is reviewed. Every Atlas tool call is permission-gated, and all edits are presented as a unified diff for approval before writing, a standard practice in 2026.

When Atlas assists with diagnosing or resolving issues in your Axum project, it operates under strict safety protocols. Before any tool, including `bash` or `read`, is executed, it passes through permission-gated allow, ask, and deny rules. If Atlas proposes a fix, such as modifying an Axum handler's signature or adjusting a `Cargo.toml` dependency, it first drafts a plan in a read-only agent. Crucially, any file edit, whether it's a `rustfmt` application or a change to your `Router` or `State` type, is presented as a unified diff. This allows you, the Axum developer, to review the exact changes Atlas intends to make before they are written to disk, providing complete control and preventing unintended modifications to your Rust project.

Step by step

01Run your Axum command, such as `cargo build` or `cargo nextest run`, through `atlas bash` with a default timeout: `atlas bash "cargo build"`.
02Examine the `shell_metadata` block in Atlas's output. Look for a diagnosis of 'blocked on interactive input' or 'command timed out'.
03If the diagnosis is 'blocked on interactive input', re-run the command with non-interactive flags, for example: `atlas bash "cargo build --no-input"` or `atlas bash "cargo nextest run --no-input"`.
04If the diagnosis is 'command timed out', retry the command with an increased timeout value in milliseconds: `atlas bash --timeout 60000 "cargo nextest run"` for a 60-second timeout.
05If Atlas proposes code changes to your Axum handlers, `Cargo.toml`, or suggests running `rustfmt`, review the unified diff presented for approval before writing.

Frequently asked questions

How does Atlas detect a hanging `cargo build` in Axum?: Atlas's `bash` tool races every command against a timeout. If the command exceeds this, Atlas analyzes the process state to determine if it's waiting for interactive input or simply slow, providing a clear diagnosis in the `shell_metadata`.
What if my `cargo nextest run` is genuinely slow, not blocked, in an Axum project?: If Atlas's `shell_metadata` indicates a 'command timed out', it means your `cargo nextest run` is genuinely slow. You can then re-run `atlas bash` with a larger `--timeout` value, specified in milliseconds, to accommodate the longer execution time required for your Axum tests.
Can Atlas help with `rustfmt` hanging on a large Axum codebase?: While `rustfmt` typically doesn't hang, if it were to, Atlas would diagnose it similarly to any other command. For large Axum codebases, if `rustfmt` takes longer than the default timeout, you might increase the `atlas bash` timeout to allow it to complete.
How does Atlas ensure safety when modifying my Axum project's code?: Atlas operates with permission-gated tool calls, drafts plans in a read-only agent, and presents a unified diff for every proposed change to your Axum handlers, `Cargo.toml`, or other files before writing. This ensures you have full control and visibility over all modifications.
What are common reasons for `cargo` commands to hang in Axum projects?: The most common reason is silently blocked interactive input, where `cargo` or a script expects user confirmation but isn't getting it in a non-interactive environment. Atlas explicitly identifies this, allowing you to use flags like `--no-input` to resolve it.
Does Atlas integrate with `cargo`'s dependency management for Axum?: Yes, Atlas can execute any `cargo` command, including those for dependency management. If a `cargo update` or `cargo add` command were to hang, Atlas would diagnose it, and any proposed changes to your `Cargo.toml` would be presented for your review.

Try Atlas in your terminal

The terminal-native AI coding agent. Free core, single binary.

Install Atlas

Related guides

Diagnose a Hanging or Long-Running Command with Atlas in 2026

How to diagnose a hanging command with Atlas in 2026: the bash tool races every command against a timeout and tells you whether it is slow or blocked on input.

Atlas for Axum in 2026

Atlas is a terminal-native AI coding agent for Axum in 2026. It decodes tower trait-bound errors, adds IntoResponse types, and runs cargo nextest run.

Debug a single failing test in Axum with Atlas in 2026

Pinpoint and fix failing Axum tests with Atlas. Leverage `cargo nextest` for isolation, `lsp` for call graph analysis, and controlled code edits to ensure robust Axum applications in 2026.

Audit an Axum Repo with Parallel Subagents in Atlas (2026)

Sweep your Axum repository for specific issues without context window limits using Atlas's parallel subagents. Leverage `cargo nextest` and `rustfmt` for a robust audit.

Upgrade Axum Dependencies and Fix Breakage with Atlas in 2026

In 2026, Atlas empowers Axum developers to direct upgrade major dependencies, automatically resolving compile errors and passing `cargo nextest` with precision. Streamline your Axum project maintenance.

Trace a runtime bug from a stack trace in Axum with Atlas in 2026

Pinpoint and fix Axum runtime bugs from production stack traces using Atlas, the terminal-native AI coding agent. Leverage Axum's toolchain for rapid debugging.

Automate GitHub Issue and Pull Request Triage in Axum with Atlas in 2026

Streamline GitHub issue and pull request triage for your Axum applications using Atlas. Configure secure, trusted automation with real Axum toolchain integration.

Refactor a legacy Axum module in 2026 with Atlas

Refactor legacy Axum modules safely in 2026 using Atlas. Map public surfaces, pin behavior with cargo nextest, and apply structural changes with precise diffs. Ensure no breaking changes to your Axum application.

Browse this resource hub