Add ListTools RPC and refactor tool metadata (#8401)

* Refactor AI tool metadata

* Add ListTools RPC

* Self review

* Change title to display_name in Tool message

Author: begelundmuller

proto/gen/rill/admin/v1/admin.swagger.yaml

@@ -6319,12 +6319,21 @@ definitions:
       name:
         type: string
         title: The name of the tool
+      displayName:
+        type: string
+        title: The display name of the tool
       description:
         type: string
         title: A human-readable description of the tool
+      meta:
+        type: object
+        title: Metadata about the tool
       inputSchema:
         type: string
         title: JSON Schema defining the expected parameters for the tool (as JSON string)
+      outputSchema:
+        type: string
+        title: JSON Schema defining the expected output of the tool (as JSON string)
     title: Tool represents a tool definition for AI usage
   v1ToolCall:
     type: object

proto/gen/rill/admin/v1/openapi.yaml

@@ -1997,12 +1997,21 @@ components:
                 description:
                     title: A human-readable description of the tool
                     type: string
+                displayName:
+                    title: The display name of the tool
+                    type: string
                 inputSchema:
                     title: JSON Schema defining the expected parameters for the tool (as JSON string)
                     type: string
+                meta:
+                    title: Metadata about the tool
+                    type: object
                 name:
                     title: The name of the tool
                     type: string
+                outputSchema:
+                    title: JSON Schema defining the expected output of the tool (as JSON string)
+                    type: string
             title: Tool represents a tool definition for AI usage
             type: object
         v1ToolCall:

proto/gen/rill/admin/v1/public.openapi.yaml

@@ -1997,12 +1997,21 @@ components:
                 description:
                     title: A human-readable description of the tool
                     type: string
+                displayName:
+                    title: The display name of the tool
+                    type: string
                 inputSchema:
                     title: JSON Schema defining the expected parameters for the tool (as JSON string)
                     type: string
+                meta:
+                    title: Metadata about the tool
+                    type: object
                 name:
                     title: The name of the tool
                     type: string
+                outputSchema:
+                    title: JSON Schema defining the expected output of the tool (as JSON string)
+                    type: string
             title: Tool represents a tool definition for AI usage
             type: object
         v1ToolCall: