diff --git a/internal/generate/generator.go b/internal/generate/generator.go
index a60b89ce..cb939c85 100644
--- a/internal/generate/generator.go
+++ b/internal/generate/generator.go
@@ -646,24 +646,31 @@ func (g *Generator) writeSetupJob(sb *strings.Builder) {
 	g.writeOwnedTimeout(sb, "    ")
 	sb.WriteString("    outputs:\n")
 
-	// All outputs come from the CLI setup command
+	// All outputs come from the CLI setup command. Output keys are normalized to
+	// underscores via OutputKey: GitHub Actions parses a hyphen in an expression
+	// as subtraction, so a hyphenated key would never match the consuming if:.
 	for _, b := range g.config.Builds {
-		fmt.Fprintf(sb, "      run_build_%s: ${{ steps.setup.outputs.run_build_%s }}\n", b.Name, b.Name)
+		key := config.OutputKey(b.Name)
+		fmt.Fprintf(sb, "      run_build_%s: ${{ steps.setup.outputs.run_build_%s }}\n", key, key)
 	}
 	for _, d := range g.config.Deploys {
-		fmt.Fprintf(sb, "      run_deploy_%s: ${{ steps.setup.outputs.run_deploy_%s }}\n", d.Name, d.Name)
+		key := config.OutputKey(d.Name)
+		fmt.Fprintf(sb, "      run_deploy_%s: ${{ steps.setup.outputs.run_deploy_%s }}\n", key, key)
 	}
 	sb.WriteString("      head_sha: ${{ steps.setup.outputs.head_sha }}\n")
 	sb.WriteString("      version: ${{ steps.setup.outputs.version }}\n")
 	sb.WriteString("      previous_tag: ${{ steps.setup.outputs.previous_tag }}\n")
 	sb.WriteString("      changelog_base_sha: ${{ steps.setup.outputs.changelog_base_sha }}\n")
 
-	// Per-deployable base SHAs for callbacks that need them
+	// Per-deployable base SHAs for callbacks that need them. Keys are normalized
+	// to underscores via OutputKey for the same GitHub Actions expression reason.
 	for _, b := range g.config.Builds {
-		fmt.Fprintf(sb, "      base_build_%s: ${{ steps.setup.outputs.base_build_%s }}\n", b.Name, b.Name)
+		key := config.OutputKey(b.Name)
+		fmt.Fprintf(sb, "      base_build_%s: ${{ steps.setup.outputs.base_build_%s }}\n", key, key)
 	}
 	for _, d := range g.config.Deploys {
-		fmt.Fprintf(sb, "      base_deploy_%s: ${{ steps.setup.outputs.base_deploy_%s }}\n", d.Name, d.Name)
+		key := config.OutputKey(d.Name)
+		fmt.Fprintf(sb, "      base_deploy_%s: ${{ steps.setup.outputs.base_deploy_%s }}\n", key, key)
 	}
 
 	sb.WriteString("    steps:\n")
diff --git a/internal/generate/generator_test.go b/internal/generate/generator_test.go
index 51758581..cc9b18b2 100644
--- a/internal/generate/generator_test.go
+++ b/internal/generate/generator_test.go
@@ -877,12 +877,71 @@ on:
 	assert.Contains(t, content, "cascade orchestrate setup")
 	assert.Contains(t, content, "--gha-output")
 
-	// Outputs reference CLI outputs
-	assert.Contains(t, content, "run_deploy_app-deploy: ${{ steps.setup.outputs.run_deploy_app-deploy }}")
+	// Outputs reference CLI outputs. Output keys are normalized to underscores
+	// (GitHub Actions parses hyphens in expressions as subtraction).
+	assert.Contains(t, content, "run_deploy_app_deploy: ${{ steps.setup.outputs.run_deploy_app_deploy }}")
 	assert.Contains(t, content, "run_deploy_cdk: ${{ steps.setup.outputs.run_deploy_cdk }}")
 	assert.Contains(t, content, "run_deploy_notify: ${{ steps.setup.outputs.run_deploy_notify }}")
 }
 
+// TestGenerator_HyphenatedNameOutputKeysConsistent guards against the silent
+// skip described in #127: a hyphenated build/deploy name must produce the same
+// underscore-normalized run_build_*/run_deploy_* identifier at every site (the
+// setup job-level outputs passthrough and the consuming job if: condition). If
+// any site emits a hyphen, GitHub Actions parses the expression as subtraction
+// and the consuming job's if: never matches, silently skipping the work.
+func TestGenerator_HyphenatedNameOutputKeysConsistent(t *testing.T) {
+	tmpDir := t.TempDir()
+	workflowDir := filepath.Join(tmpDir, ".github", "workflows")
+	require.NoError(t, os.MkdirAll(workflowDir, 0755))
+
+	mockWorkflow := `name: Mock
+on:
+  workflow_call:
+    outputs:
+      result:
+        value: test
+`
+	require.NoError(t, os.WriteFile(filepath.Join(workflowDir, "build.yaml"), []byte(mockWorkflow), 0644))
+	require.NoError(t, os.WriteFile(filepath.Join(workflowDir, "deploy.yaml"), []byte(mockWorkflow), 0644))
+
+	cfg := &config.TrunkConfig{
+		TrunkBranch:  "main",
+		Environments: []string{"dev"},
+		Builds: []config.BuildConfig{
+			{Name: "shared-lib", Workflow: ".github/workflows/build.yaml", Triggers: []string{"libs/**"}},
+		},
+		Deploys: []config.DeployConfig{
+			{Name: "web-api", Workflow: ".github/workflows/deploy.yaml", Triggers: []string{"api/**"}},
+		},
+	}
+
+	gen := NewGenerator(cfg, tmpDir)
+	content, err := gen.Generate()
+	require.NoError(t, err)
+
+	// (a) The job-level outputs passthrough uses the underscore identifier on
+	// BOTH the output key and the steps.setup.outputs.* reference.
+	assert.Contains(t, content, "run_build_shared_lib: ${{ steps.setup.outputs.run_build_shared_lib }}",
+		"build passthrough must use underscore output key and reference")
+	assert.Contains(t, content, "run_deploy_web_api: ${{ steps.setup.outputs.run_deploy_web_api }}",
+		"deploy passthrough must use underscore output key and reference")
+
+	// (b) No hyphenated run_* output identifier appears anywhere. A hyphen in a
+	// GHA expression is subtraction, so these would silently break.
+	assert.NotContains(t, content, "run_build_shared-lib",
+		"hyphenated build output identifier breaks GHA expression parsing")
+	assert.NotContains(t, content, "run_deploy_web-api",
+		"hyphenated deploy output identifier breaks GHA expression parsing")
+
+	// (c) The consuming job if: condition references the SAME underscore key the
+	// passthrough exposes (not an always-false hyphenated reference).
+	assert.Contains(t, content, "needs.setup.outputs.run_build_shared_lib == 'true'",
+		"build if: must reference the underscore-normalized key")
+	assert.Contains(t, content, "needs.setup.outputs.run_deploy_web_api == 'true'",
+		"deploy if: must reference the underscore-normalized key")
+}
+
 func TestGenerator_BuildLinkedDeployCondition(t *testing.T) {
 	tmpDir := t.TempDir()
 	workflowDir := filepath.Join(tmpDir, ".github", "workflows")
@@ -1004,8 +1063,8 @@ on:
 	assert.Contains(t, content, "cascade orchestrate setup")
 	assert.Contains(t, content, "--gha-output")
 
-	// Outputs reference CLI outputs
-	assert.Contains(t, content, "run_deploy_app-deploy: ${{ steps.setup.outputs.run_deploy_app-deploy }}")
+	// Outputs reference CLI outputs. Output keys are normalized to underscores.
+	assert.Contains(t, content, "run_deploy_app_deploy: ${{ steps.setup.outputs.run_deploy_app_deploy }}")
 	assert.Contains(t, content, "run_deploy_cdk: ${{ steps.setup.outputs.run_deploy_cdk }}")
 	assert.Contains(t, content, "run_deploy_notify: ${{ steps.setup.outputs.run_deploy_notify }}")
 
diff --git a/internal/output/output.go b/internal/output/output.go
index cf1f522f..1fc2acd7 100644
--- a/internal/output/output.go
+++ b/internal/output/output.go
@@ -7,6 +7,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/stablekernel/cascade/internal/config"
 	"github.com/stablekernel/cascade/internal/ghaoutput"
 	"github.com/stablekernel/cascade/internal/globals"
 )
@@ -141,19 +142,21 @@ func (r *SetupResult) WriteGHAOutput() error {
 	w.Set("previous_tag", r.PreviousTag)
 	w.Set("changelog_base_sha", r.ChangelogBaseSHA)
 
-	// Build decisions
+	// Build decisions. Output keys are normalized to underscores via OutputKey
+	// so they match the run_build_* identifiers the generated workflow consumes;
+	// GitHub Actions parses a hyphen in an expression as subtraction.
 	for name, run := range r.RunBuilds {
-		w.SetBool(fmt.Sprintf("run_build_%s", name), run)
+		w.SetBool(fmt.Sprintf("run_build_%s", config.OutputKey(name)), run)
 	}
 
 	// Deploy decisions
 	for name, run := range r.RunDeploys {
-		w.Set(fmt.Sprintf("run_deploy_%s", name), run)
+		w.Set(fmt.Sprintf("run_deploy_%s", config.OutputKey(name)), run)
 	}
 
 	// Base SHAs for per-deployable change detection
 	for name, sha := range r.BaseSHAs {
-		w.Set(fmt.Sprintf("base_%s", name), sha)
+		w.Set(fmt.Sprintf("base_%s", config.OutputKey(name)), sha)
 	}
 
 	return w.Flush()