creating-zed-extensions

SKILL.md

Zed extensions are Rust programs compiled to WebAssembly that can provide slash commands, language support, themes, grammars, and MCP servers. Extensions implement the zed::Extension trait and are distributed via Zed's extension registry.

| Wrong crate type | WASM compilation fails | Use crate-type = ["cdylib"] in Cargo.toml | | Missing error handling | Extension crashes | Return Err(String) for failures | | Not validating args | Silent failures | Check args.isempty() for required args | | Hardcoded paths | Extension not portable | Use relative paths or worktree context |

| Missing default case | Unhandled commands crash | Add => Err(...) in match | | Unlicensed extension | Rejected by registry | Include approved license in extension.toml | | Blocking operations | Freezes Zed UI | Use async or spawn threads for long operations |

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