intelligent-terminal: Instructions file for GitHub Copilot

Rust conventions

Follow the existing crate's architecture and style before introducing a new pattern or dependency.

Implementation

• Prefer clear ownership and borrowing over cloning or unnecessary allocation.
• Use domain types and enums to make invalid states difficult to represent.
• Accept &str or borrowed values when ownership is not required.
• Keep iterators lazy when that improves clarity; use direct loops when they are easier to read.
• Keep async work non-blocking. Move blocking filesystem or process work to the crate's established blocking boundary.
• Avoid unsafe. When it is required, minimize its scope and document the safety invariant.
• Do not add abstraction, traits, builders, or dependencies without a concrete need in the changed code.

Errors

• Return Result for recoverable failures and add context at I/O, process, parsing, and protocol boundaries.
• Use the crate's existing error type and conventions; do not introduce a new error-handling dependency solely for a local change.
• Avoid unwrap, expect, and panics in production paths unless an invariant is both local and demonstrably impossible to violate.
• Do not silently discard errors. Log, propagate, or explicitly document why an error is intentionally ignored.

Documentation and tests

• Comment invariants, non-obvious concurrency, and compatibility constraints; do not narrate straightforward code.
• Add focused tests for behavior changes and regressions. Keep unit tests near the code unless the crate already uses an integration-test boundary.
• Do not require every private item to have documentation or every change to introduce a new abstraction.

Validation

• Run cargo fmt for changed Rust code.
• Run the smallest relevant tests while iterating, then the crate's required test command.
• Run Clippy only when the crate already uses it or the task requires it; do not perform unrelated cleanup.
• Keep builds warning-free under the repository's configured toolchain.