Rust
Rust rules for Cursor
Error handling and safety rules for Rust crates.
The rule
Save as .cursor/rules/rust.mdc. Cursor picks it up on the next request.
.cursor/rules/rust.mdc
--- description: Rust conventions globs: **/*.rs alwaysApply: false --- - No unwrap() or expect() outside tests and examples; propagate errors with ?. - Use thiserror for library errors and anyhow only in binaries. - No unsafe blocks without a // SAFETY: comment explaining the invariant. - Run cargo fmt, cargo clippy -- -D warnings and cargo test before finishing.
How Cursor loads this rule
Read from the frontmatter above, per Cursor's rules documentation.
alwaysApply: falsewithglobs: **/*.rs: attached automatically when a matching file is in context.- Keep the
.mdcextension. A plain.mdfile in .cursor/rules is ignored by the rules system. - Prefer to generate your own? Type
/create-rulein Agent and describe what you want; Cursor saves the file to .cursor/rules. - Team Rules come first, then Project Rules like this one, then User Rules. Earlier sources win when guidance conflicts.
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Using another agent too?
The same instructions work as plain Markdown in AGENTS.md, which Codex, Gemini CLI, GitHub Copilot and most other coding agents read.
AGENTS.md (section)
## Rust - No unwrap() or expect() outside tests and examples; propagate errors with ?. - Use thiserror for library errors and anyhow only in binaries. - No unsafe blocks without a // SAFETY: comment explaining the invariant. - Run cargo fmt, cargo clippy -- -D warnings and cargo test before finishing.
More templates
Get Cursor rules and settings changes by email
When Cursor changes how rules, run modes or settings work, we update these templates from the docs and send a short note. One email a week at most.
Reviewed Oct 17, 2026. Written by AgentAtlas. Adapt it to your codebase before relying on it.