On Windows, HOME is often unset. The CLI crashed at startup with
'error: io error: HOME is not set' because three paths only checked
HOME:
- config_home_dir() in tools crate (config/settings loading)
- credentials_home_dir() in runtime crate (OAuth credentials)
- detect_broad_cwd() in CLI (CWD-is-home-dir check)
- skill lookup roots in tools crate
All now fall through to USERPROFILE when HOME is absent. Error message
updated to suggest USERPROFILE or CLAW_CONFIG_HOME on Windows.
Source: MaxDerVerpeilte in #claw-code (Windows user, 2026-04-10).
This adds crate-level and type-level Rustdoc to the runtime crate's core exported types so downstream crates and contributors can understand the session, prompt, permission, OAuth, usage, and tool I/O primitives without spelunking every implementation file.
Constraint: The docs pass needed to stay focused on public runtime types without changing behavior
Rejected: Add blanket docs to every public item in one sweep | larger churn than needed for a targeted docs pass
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: When exporting new runtime primitives from lib.rs, add a short Rustdoc summary in the defining module at the same time
Tested: cargo build --workspace; cargo test --workspace
Not-tested: rustdoc HTML rendering beyond doc-test coverage
