diff --git a/.pi/skills/build-style b/.pi/skills/build-style
new file mode 120000
index 0000000..d358654
--- /dev/null
+++ b/.pi/skills/build-style
@@ -0,0 +1 @@
+../../src/skills/style/build
\ No newline at end of file
diff --git a/src/skills/style/build/SKILL.md b/src/skills/style/build/SKILL.md
new file mode 100644
index 0000000..05eee90
--- /dev/null
+++ b/src/skills/style/build/SKILL.md
@@ -0,0 +1,9 @@
+---
+name: build-style
+description: Use when creating, editing, or reviewing build files, package manifests, build targets, or dependency metadata in this repository.
+---
+
+# build-style
+
+Use this skill as the source of truth for repository build conventions.
+Follow the shared style skill instructions in `src/skills/style/STYLE.md`.
diff --git a/src/skills/style/rust/rules/build.md b/src/skills/style/build/rules/rust.md
similarity index 69%
rename from src/skills/style/rust/rules/build.md
rename to src/skills/style/build/rules/rust.md
index 4ccf566..f66d2cb 100644
--- a/src/skills/style/rust/rules/build.md
+++ b/src/skills/style/build/rules/rust.md
@@ -1,4 +1,4 @@
-# Build rules
+# Rust build rules
 
 ## Use workspace dependency versions
 
@@ -14,6 +14,21 @@ Add package-local dependency features only when the feature set is specific to t
 The repository has one Cargo workspace and one `Cargo.lock`.
 Centralized dependency versions keep package manifests consistent with the workspace lockfile.
 
+## Declare Rust dependencies in each build system
+
+### Rule
+
+Declare each direct crate dependency in each build system that builds the Rust target.
+For Cargo, declare the crate in the package `Cargo.toml` file.
+Use `workspace = true` for workspace-managed dependencies.
+For Bazel, add the crate label to the `deps` of the target that uses it.
+Apply this rule to `rust_library`, `rust_binary`, and `rust_test` targets.
+
+### Rationale
+
+Cargo and Bazel resolve Rust dependencies independently.
+Complete declarations keep `cargo check`, Rust Analyzer, and Bazel builds consistent.
+
 ## Declare Rust tests in Bazel
 
 ### Rule