ci: skip workflows whose inputs did not change

.github/workflows/codeql.yml

@@ -1,11 +1,28 @@
 ---
 name: codeql
 
+# Push and pull_request run only when Rust, workflow, or script inputs change.
+# A Markdown-only commit skips both analyzers. The weekly schedule has no path
+# filter, so that scan still covers the whole tree.
 on:
   push:
     branches: [main]
+    paths:
+      - '**/*.rs'
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+      - '.github/**'
+      - '**/*.sh'
+      - '**/*.py'
   pull_request:
     branches: [main]
+    paths:
+      - '**/*.rs'
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+      - '.github/**'
+      - '**/*.sh'
+      - '**/*.py'
   schedule:
     - cron: "44 3 * * 6"
 

.github/workflows/cutile-rs.yml

@@ -39,8 +39,11 @@ defaults:
 
 jobs:
   # Tile lane gate: cutile-rs tree plus shared host crates. Skips when only
-  # cuda-oxide changes. When copy-pr-bot yields no detectable file diff, run
-  # anyway so the mirror push is never silently skipped.
+  # cuda-oxide (or any other non-tile path) changes. `any_changed` is a real
+  # filter: dorny/paths-filter sets an output only for filters declared here,
+  # and an undeclared name stays empty, which would make `!= 'true'` always
+  # succeed. When copy-pr-bot yields no detectable file diff, both outputs are
+  # false and the jobs run anyway so the mirror push is never silently skipped.
   changes:
     runs-on: ubuntu-latest
     outputs:
@@ -65,6 +68,10 @@ jobs:
               - 'rust-toolchain.toml'
               - '.github/workflows/cutile-rs.yml'
               - '.github/copy-pr-bot.yaml'
+            # `*` covers a root file such as AGENTS.md. `**` covers every nested path.
+            any_changed:
+              - '*'
+              - '**'
 
   # Exercise the oldest Tile IR assembler, including its lack of
   # --list-versions. The separate 13.0 lane only checks shared host crates.

.github/workflows/naming-guard.yml

@@ -1,11 +1,26 @@
 ---
 name: naming-guard
 
+# check-reserved-prefixes.sh searches only cuda-oxide/crates. The strings it
+# looks for are the SIMT link-symbol prefixes owned by reserved-oxide-symbols;
+# every other SIMT crate must use that crate's constants. cutile-rs and the
+# shared host crates (cuda-bindings, cuda-core, cuda-core-derive, cuda-async)
+# are outside that rule, so these paths omit them. Listing those directories
+# here would rerun the same search; covering them means adding them to
+# SEARCH_ROOTS in the script first.
 on:
   push:
     branches: [main]
+    paths:
+      - 'cuda-oxide/crates/**'
+      - 'cuda-oxide/scripts/check-reserved-prefixes.sh'
+      - '.github/workflows/naming-guard.yml'
   pull_request:
     branches: [main]
+    paths:
+      - 'cuda-oxide/crates/**'
+      - 'cuda-oxide/scripts/check-reserved-prefixes.sh'
+      - '.github/workflows/naming-guard.yml'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref_name }}