diff --git a/.github/.cspell/rust-dependencies.txt b/.github/.cspell/rust-dependencies.txt
index 48f1cbfc..d97977e3 100644
--- a/.github/.cspell/rust-dependencies.txt
+++ b/.github/.cspell/rust-dependencies.txt
@@ -1,8 +1,4 @@
 // This file is @generated by tidy.sh.
 // It is not intended for manual editing.
 
-anyhow
-json
-semver
-serde
 ureq
diff --git a/tools/tidy.sh b/tools/tidy.sh
index 18d4a9f8..a0500f51 100755
--- a/tools/tidy.sh
+++ b/tools/tidy.sh
@@ -145,24 +145,36 @@ fi
 # Spell check (if config exists)
 if [[ -f .cspell.json ]]; then
     if type -P npm &>/dev/null; then
-        if [[ -f Cargo.toml ]]; then
-            metadata=$(cargo metadata --format-version=1 --all-features --no-deps)
+        if [[ -n "$(git ls-files '*Cargo.toml')" ]]; then
             dependencies=''
-            for id in $(jq <<<"${metadata}" '.workspace_members[]'); do
-                dependencies+=$'\n'
-                dependencies+=$(jq <<<"${metadata}" ".packages[] | select(.id == ${id})" | jq -r '.dependencies[].name')
+            for manifest_path in $(git ls-files '*Cargo.toml'); do
+                if [[ "${manifest_path}" != "Cargo.toml" ]] && ! grep -Eq '\[workspace\]' "${manifest_path}"; then
+                    continue
+                fi
+                metadata=$(cargo metadata --format-version=1 --all-features --no-deps --manifest-path "${manifest_path}")
+                for id in $(jq <<<"${metadata}" '.workspace_members[]'); do
+                    dependencies+=$'\n'
+                    dependencies+=$(jq <<<"${metadata}" ".packages[] | select(.id == ${id})" | jq -r '.dependencies[].name')
+                done
             done
-            cat >.github/.cspell/rust-dependencies.txt <<EOF
+            words=''
+            # shellcheck disable=SC2001
+            for word in $(sed <<<"${dependencies}" 's/[0-9_-]/\n/g' | LC_ALL=C sort -f -u | (grep -E '.{4,}' || true)); do
+                # Skip if the word is contained in other dictionaries.
+                if ! npx cspell trace "${word}" 2>/dev/null | (grep -v -E '/(project-dictionary|rust-dependencies)\.txt' || true) | grep -Eq "^${word} \* [0-9A-Za-z_-]+\* "; then
+                    words+=$'\n'
+                    words+="${word}"
+                fi
+            done
+        fi
+        cat >.github/.cspell/rust-dependencies.txt <<EOF
 // This file is @generated by $(basename "$0").
 // It is not intended for manual editing.
-
 EOF
-            # shellcheck disable=SC2001
-            sed <<<"${dependencies}" 's/[0-9_-]/\n/g' | LC_ALL=C sort -f -u | (grep -E '.{4,}' || true) >>.github/.cspell/rust-dependencies.txt
-            check_diff .github/.cspell/rust-dependencies.txt
-        else
-            touch .github/.cspell/rust-dependencies.txt
+        if [[ -n "${words:-}" ]]; then
+            echo "${words}" >>.github/.cspell/rust-dependencies.txt
         fi
+        check_diff .github/.cspell/rust-dependencies.txt
 
         echo "+ npx cspell --no-progress \$(git ls-files)"
         npx cspell --no-progress $(git ls-files)