2 files changed, 0 insertions, 6 deletions
diff --git a/packages/core/src/tools/tools.test.ts b/packages/core/src/tools/tools.test.ts
index a98d1121..f9828010 100644
--- a/packages/core/src/tools/tools.test.ts
+++ b/packages/core/src/tools/tools.test.ts
@@ -101,7 +101,6 @@ describe('DeclarativeTool', () => {
       const successResult: ToolResult = {
         llmContent: 'Success!',
         returnDisplay: 'Success!',
-        summary: 'Tool executed successfully',
       };
       const executeFn = vi.fn().mockResolvedValue(successResult);
       const invocation = new TestToolInvocation({}, executeFn);
diff --git a/packages/core/src/tools/tools.ts b/packages/core/src/tools/tools.ts
index 64a2e83a..58773d25 100644
--- a/packages/core/src/tools/tools.ts
+++ b/packages/core/src/tools/tools.ts
@@ -309,11 +309,6 @@ export type AnyDeclarativeTool = DeclarativeTool<object, ToolResult>;
 
 export interface ToolResult {
   /**
-   * A short, one-line summary of the tool's action and result.
-   * e.g., "Read 5 files", "Wrote 256 bytes to foo.txt"
-   */
-  summary?: string;
-  /**
    * Content meant to be included in LLM history.
    * This should represent the factual outcome of the tool execution.
    */