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CONTRIBUTING.md

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+# Contributing to Claw Code
+
+Thanks for helping improve Claw Code. This repository is a Rust-first CLI
+workspace with supporting docs and compatibility fixtures.
+
+## Ground rules
+
+- Keep changes small, reviewable, and tied to a concrete issue or behavior.
+- Do not commit secrets, API keys, session transcripts with credentials, or
+  generated build output.
+- Prefer existing crate boundaries and utilities before adding dependencies.
+- Update documentation when a user-facing command, config key, or provider
+  behavior changes.
+- Keep examples copy/paste safe. Use placeholder keys such as `sk-ant-...` and
+  avoid commands that require live credentials unless the text explicitly says
+  so.
+
+## Local setup
+
+```bash
+git clone https://github.com/ultraworkers/claw-code
+cd claw-code/rust
+cargo build --workspace
+cargo test --workspace
+```
+
+On Windows PowerShell, build from the same `rust` workspace and run the binary
+with the `.exe` suffix:
+
+```powershell
+cd claw-code\rust
+cargo build --workspace
+.\target\debug\claw.exe --help
+```
+
+## Checks before opening a pull request
+
+Run the smallest relevant tests for your change, then the broader checks when
+you touch shared runtime, CLI, or docs surfaces:
+
+```bash
+cd rust
+cargo fmt --all --check
+cargo test --workspace
+cargo clippy --workspace
+```
+
+For documentation and release-readiness changes, also run:
+
+```bash
+python .github/scripts/check_doc_source_of_truth.py
+python .github/scripts/check_release_readiness.py
+```
+
+## Pull request guidance
+
+- Describe the user-visible reason for the change.
+- List the commands you ran and any known gaps.
+- Call out compatibility risks for CLI output, JSON schemas, plugin contracts,
+  provider behavior, or Windows/PowerShell examples.
+- Keep unrelated cleanup out of feature or fix pull requests.
+
+## License
+
+By contributing, you agree that your contributions are licensed under the
+project's [MIT License](./LICENSE).