Add verify-standalone recipe

justfile

@@ -3,6 +3,7 @@ alias c := check
 alias f := fmt
 alias t := test
 alias p := pre-push
+alias vs := verify-standalone
 
 _default:
   @just --list
@@ -57,3 +58,43 @@ _test-testenv:
 
 # Run pre-push suite: format, check, and test
 pre-push: fmt check test
+
+# Verify that a crate can be built standalone without workspace dependencies
+# This ensures the crate is publishable and doesn't accidentally depend on
+# breaking changes from other workspace crates
+verify-standalone crate *args="":
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    echo "Verifying {{crate}} can build standalone..."
+
+    # Package the crate (default: --no-verify, can be overridden with args)
+    cargo package -p {{crate}} --no-verify {{args}}
+
+    # Find the packaged tarball
+    CRATE_VERSION=$(cargo metadata --format-version 1 --no-deps | jq -r ".packages[] | select(.name == \"{{crate}}\") | .version")
+    TARBALL="target/package/{{crate}}-${CRATE_VERSION}.crate"
+
+    if [ ! -f "$TARBALL" ]; then
+        echo "Error: Could not find packaged tarball at $TARBALL"
+        exit 1
+    fi
+
+    # Create a temporary directory for unpacking
+    TEMP_DIR=$(mktemp -d)
+    trap "rm -rf $TEMP_DIR" EXIT
+
+    # Unpack the tarball
+    tar -xzf "$TARBALL" -C "$TEMP_DIR"
+
+    # Build the unpacked crate with --locked to ensure it uses registry dependencies
+    cd "$TEMP_DIR/{{crate}}-${CRATE_VERSION}"
+
+    # Set temporary directories to avoid using workspace dependencies
+    export CARGO_HOME="$TEMP_DIR/.cargo"
+    export CARGO_TARGET_DIR="$TEMP_DIR/target"
+
+    echo "Building {{crate}} in isolation..."
+    cargo build --locked
+
+    echo "✅ {{crate}} builds successfully in isolation!"