working out the worker/execution interface

packs/core/actions/echo.yaml

@@ -12,37 +12,24 @@ runner_type: shell
 # Entry point is the shell command or script to execute
 entry_point: echo.sh
 
+# Parameter delivery: stdin for secure parameter passing (no env vars)
+parameter_delivery: stdin
+parameter_format: dotenv
+
+# Output format: text (no structured data parsing)
+output_format: text
+
 # Action parameters schema (standard JSON Schema format)
 parameters:
   type: object
   properties:
     message:
       type: string
-      description: "Message to echo"
-      default: "Hello, World!"
-    uppercase:
-      type: boolean
-      description: "Convert message to uppercase before echoing"
-      default: false
-  required:
-    - message
+      description: "Message to echo (empty string if not provided)"
+  required: []
 
-# Output schema
-output_schema:
-  type: object
-  properties:
-    stdout:
-      type: string
-      description: "Standard output from the echo command"
-    stderr:
-      type: string
-      description: "Standard error output (usually empty)"
-    exit_code:
-      type: integer
-      description: "Exit code of the command (0 = success)"
-    result:
-      type: string
-      description: "The echoed message"
+# Output schema: not applicable for text output format
+# The action outputs plain text to stdout
 
 # Tags for categorization
 tags: