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ninja

Use when diagnosing Ninja build failures, tuning parallelism, interpreting verbose output, or working with build.ninja files as a CMake-generated low-level build executor.

.devin/skills/ninja/SKILL.md

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# Ninja

Ninja is the low-level build executor that CMake, Meson, and other generators emit `build.ninja` for. Grounded against Ninja 1.13.2.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task diagnoses a Ninja build failure, tunes parallelism, interprets Ninja output, inspects or edits a `build.ninja` file, or uses Ninja as a CMake or Meson backend. |
| Authority | Reversible local: writes only build outputs inside the build directory; `build.ninja` itself is generated, so edits go to the generator's input files; rollback is version control plus `ninja -t clean`. No remote mutation. |
| Side effect | `ninja` runs build commands and writes outputs; `ninja -t clean` removes them. |
| Done | The build completes or the failing edge is identified with its cause, and the fix lands in the generator input rather than in `build.ninja`. |

## Inputs