feat: add scoped multimodal image attachments

crates/worker/src/feature/builtin/flow_transition.rs

@@ -253,6 +253,7 @@ impl Tool for RequestFlowTransitionTool {
         Ok(ToolOutput {
             summary,
             content: Some(content),
+            attachments: Vec::new(),
         })
     }
 }
@@ -422,6 +423,7 @@ impl Tool for FinishFlowVerificationTool {
         Ok(ToolOutput {
             summary: "Recorded complete Flow verification verdicts.".to_string(),
             content: Some("{\"accepted\":true}".to_string()),
+            attachments: Vec::new(),
         })
     }
 }

crates/worker/src/feature/builtin/manage_workdir.rs

@@ -492,6 +492,7 @@ fn workdir_output<T: Serialize>(summary: String, value: &T) -> Result<ToolOutput
     Ok(ToolOutput {
         summary,
         content: Some(serde_json::to_string_pretty(value).map_err(decode_error)?),
+        attachments: Vec::new(),
     })
 }
 

crates/worker/src/feature/builtin/manage_worker.rs

@@ -283,6 +283,7 @@ impl Tool for WorkspaceWorkerTool {
         Ok(ToolOutput {
             summary: format!("{} completed", self.operation.tool_name()),
             content: Some(response.body),
+            attachments: Vec::new(),
         })
     }
 }

crates/worker/src/feature/builtin/memory.rs

@@ -292,6 +292,7 @@ fn tool_output(output: MemoryToolOutput) -> ToolOutput {
     ToolOutput {
         summary: output.summary,
         content: output.content,
+        attachments: Vec::new(),
     }
 }
 

crates/worker/src/feature/builtin/memory_extract.rs

@@ -235,6 +235,7 @@ impl Tool for StageMemoryCandidateTool {
         Ok(ToolOutput {
             summary: format!("Staged Memory candidate {staging_id}."),
             content: Some(format!("staging_id: {staging_id}")),
+            attachments: Vec::new(),
         })
     }
 }
@@ -281,6 +282,7 @@ impl Tool for FinishMemoryExtractionTool {
                     format!("Finished extraction with {actual} staged candidate(s).")
                 }),
             content: None,
+            attachments: Vec::new(),
         })
     }
 }

crates/worker/src/feature/builtin/objective.rs

@@ -41,6 +41,8 @@ impl WorkspaceHttpObjectiveBackend {
         Ok(ToolOutput {
             summary: format!("Listed {count} objective(s)"),
             content: Some(serde_json::to_string_pretty(&response).map_err(decode_error)?),
+
+            attachments: Vec::new(),
         })
     }
 
@@ -249,6 +251,8 @@ fn objective_output(summary: String, response: ObjectiveDetail) -> Result<ToolOu
     Ok(ToolOutput {
         summary,
         content: Some(serde_json::to_string_pretty(&response).map_err(decode_error)?),
+
+        attachments: Vec::new(),
     })
 }
 

crates/worker/src/feature/builtin/session_explore.rs

@@ -384,6 +384,7 @@ fn json_output(summary: String, value: serde_json::Value) -> Result<ToolOutput,
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 

crates/worker/src/feature/builtin/task/tool_impl.rs

@@ -111,6 +111,8 @@ impl Tool for TaskListTool {
         Ok(ToolOutput {
             summary: list_overview(active_tasks.len(), tasks.len()),
             content: Some(render_task_list(&tasks)),
+
+            attachments: Vec::new(),
         })
     }
 }
@@ -131,6 +133,8 @@ impl Tool for TaskGetTool {
         Ok(ToolOutput {
             summary: format!("Task {} ({}) {}", task.taskid, task.status, task.subject),
             content: Some(content),
+
+            attachments: Vec::new(),
         })
     }
 }
@@ -170,6 +174,8 @@ fn task_output(summary: String, task: &TaskEntry) -> ToolOutput {
     ToolOutput {
         summary,
         content: Some(serde_json::to_string_pretty(task).unwrap_or_default()),
+
+        attachments: Vec::new(),
     }
 }
 

crates/worker/src/feature/builtin/worker_observation.rs

@@ -739,6 +739,7 @@ fn json_output(summary: String, value: serde_json::Value) -> Result<ToolOutput,
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 

crates/worker/src/feature/mcp.rs

@@ -781,6 +781,7 @@ fn render_list_resources_result(result: ListResourcesResult) -> Result<ToolOutpu
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 
@@ -822,6 +823,7 @@ fn render_read_resource_result(result: ReadResourceResult) -> Result<ToolOutput,
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 
@@ -876,6 +878,7 @@ fn render_list_prompts_result(result: ListPromptsResult) -> Result<ToolOutput, T
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 
@@ -924,6 +927,7 @@ fn render_get_prompt_result(result: GetPromptResult) -> Result<ToolOutput, ToolE
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 
@@ -1242,6 +1246,7 @@ fn render_call_tool_result(
     Ok(ToolOutput {
         summary,
         content: Some(content),
+        attachments: Vec::new(),
     })
 }
 

crates/worker/src/feature/plugin.rs

@@ -4098,6 +4098,8 @@ impl PluginInstance {
                 Ok(ToolOutput {
                     summary: format!("{tool_name}: {tool_calls}"),
                     content: Some(String::from_utf8_lossy(&input).to_string()),
+
+                    attachments: Vec::new(),
                 })
             }
             PluginInstanceRuntime::ComponentInstance(runtime) => {
@@ -5447,7 +5449,11 @@ fn decode_plugin_wasm_output(bytes: &[u8]) -> Result<ToolOutput, PluginWasmError
             ));
         }
     };
-    Ok(ToolOutput { summary, content })
+    Ok(ToolOutput {
+        summary,
+        content,
+        attachments: Vec::new(),
+    })
 }
 
 fn bounded_message(message: impl Into<String>) -> String {