diff --git a/plan/plan.go b/plan/plan.go
index ab749426..ad7b58ad 100644
--- a/plan/plan.go
+++ b/plan/plan.go
@@ -59,7 +59,7 @@ func (p *Plan) Source() *compiler.Value {
 // registerLocalDirectories scans the context for local imports.
 // BuildKit requires to known the list of directories ahead of time.
 func (p *Plan) registerLocalDirs() error {
-	imports, err := p.source.Lookup("input.directories").Fields()
+	imports, err := p.source.Lookup("inputs.directories").Fields()
 	if err != nil {
 		return err
 	}
diff --git a/stdlib/europa/dagger/engine/plan.cue b/stdlib/europa/dagger/engine/plan.cue
index 941d1b46..d813666f 100644
--- a/stdlib/europa/dagger/engine/plan.cue
+++ b/stdlib/europa/dagger/engine/plan.cue
@@ -3,7 +3,7 @@ package engine
 // A deployment plan executed by `dagger up`
 #Plan: {
 	// Receive inputs from the client
-	input: {
+	inputs: {
 		// Receive directories
 		directories: [string]: _#inputDirectory
 		// Securely receive secrets
diff --git a/stdlib/europa/dagger/engine/spec/engine/plan.cue b/stdlib/europa/dagger/engine/spec/engine/plan.cue
index ab4ecc57..423c31b8 100644
--- a/stdlib/europa/dagger/engine/spec/engine/plan.cue
+++ b/stdlib/europa/dagger/engine/spec/engine/plan.cue
@@ -7,7 +7,7 @@ package engine
 // A special kind of program which `dagger` can execute.
 #DAG: {
 	// Receive inputs from the client
-	input: {
+	inputs: {
 		// Receive directories
 		directories: [name=string]: _#inputDirectory
 		// Securely receive secrets
@@ -17,7 +17,7 @@ package engine
 	}
 
 	// Send outputs to the client
-	output: {
+	outputs: {
 		directories: [name=string]: _#outputDirectory
 	}
 
diff --git a/tests/plan.bats b/tests/plan.bats
index 222dc085..b2e29e32 100644
--- a/tests/plan.bats
+++ b/tests/plan.bats
@@ -42,4 +42,11 @@ setup() {
 @test "plan/inputs/directories exists" {
   cd "$TESTDIR"
   "$DAGGER" --europa up ./plan/inputs/directories/exists.cue
+}
+
+@test "plan/inputs/directories conflicting values" {
+  cd "$TESTDIR"
+  run "$DAGGER" --europa up ./plan/inputs/directories/conflicting_values.cue
+	assert_failure
+	assert_output --partial 'failed to up environment: actions.verify.contents: conflicting values "local directory" and "local dfsadf"'
 }
\ No newline at end of file
diff --git a/tests/plan/inputs/directories/conflicting_values.cue b/tests/plan/inputs/directories/conflicting_values.cue
new file mode 100644
index 00000000..69f3694f
--- /dev/null
+++ b/tests/plan/inputs/directories/conflicting_values.cue
@@ -0,0 +1,15 @@
+package main
+
+import (
+	"alpha.dagger.io/europa/dagger/engine"
+)
+
+engine.#Plan & {
+	inputs: directories: test: path: "./plan/inputs/directories"
+	actions: verify: engine.#ReadFile & {
+		input: inputs.directories.test.contents
+		path:  "test.txt"
+	} & {
+		contents: "local dfsadf" // should fail with conflicting values
+	}
+}
diff --git a/tests/plan/inputs/directories/exists.cue b/tests/plan/inputs/directories/exists.cue
index d709f2ff..76201c34 100644
--- a/tests/plan/inputs/directories/exists.cue
+++ b/tests/plan/inputs/directories/exists.cue
@@ -1,16 +1,15 @@
 package main
 
 import (
-	"alpha.dagger.io/europa/dagger"
 	"alpha.dagger.io/europa/dagger/engine"
 )
 
-dagger.#Plan & {
-	input: directories: test: path: "./plan/inputs/directories"
+engine.#Plan & {
+	inputs: directories: test: path: "./plan/inputs/directories"
 	actions: verify: engine.#ReadFile & {
-		input: input.directories.test.contents
+		input: inputs.directories.test.contents
 		path:  "test.txt"
 	} & {
-		contents: "local directory\n"
+		contents: "local directory"
 	}
 }