diff --git a/.changeset/witty-places-film.md b/.changeset/witty-places-film.md
new file mode 100644
index 00000000000..c6a7b258ebe
--- /dev/null
+++ b/.changeset/witty-places-film.md
@@ -0,0 +1,5 @@
+---
+"@effect/ai": patch
+---
+
+Fix Prompt.fromResponseParts when input contains a provider executed tool
diff --git a/packages/ai/ai/src/Prompt.ts b/packages/ai/ai/src/Prompt.ts
index b4051dbf62e..40e6bed078c 100644
--- a/packages/ai/ai/src/Prompt.ts
+++ b/packages/ai/ai/src/Prompt.ts
@@ -611,7 +611,8 @@ export const toolCallPart = (params: PartConstructorParams<ToolCallPart>): ToolC
  *     temperature: 22,
  *     condition: "sunny",
  *     humidity: 65
- *   }
+ *   },
+ *   providerExecuted: false
  * })
  * ```
  *
@@ -635,6 +636,10 @@ export interface ToolResultPart extends BasePart<"tool-result", ToolResultPartOp
    * The result returned by the tool execution.
    */
   readonly result: unknown
+  /**
+   * Whether the tool was executed by the provider (true) or framework (false).
+   */
+  readonly providerExecuted: boolean
 }
 
 /**
@@ -660,6 +665,10 @@ export interface ToolResultPartEncoded extends BasePartEncoded<"tool-result", To
    * The result returned by the tool execution.
    */
   readonly result: unknown
+  /**
+   * Whether the tool was executed by the provider (true) or framework (false).
+   */
+  readonly providerExecuted: boolean
 }
 
 /**
@@ -683,6 +692,7 @@ export const ToolResultPart: Schema.Schema<ToolResultPart, ToolResultPartEncoded
   name: Schema.String,
   isFailure: Schema.Boolean,
   result: Schema.Unknown,
+  providerExecuted: Schema.Boolean,
   options: Schema.optionalWith(ProviderOptions, { default: constEmptyObject })
 }).pipe(
   Schema.attachPropertySignature(PartTypeId, PartTypeId),
@@ -1036,7 +1046,8 @@ export const userMessage = (params: MessageConstructorParams<UserMessage>): User
  *       result: {
  *         temperature: 72,
  *         condition: "sunny"
- *       }
+ *       },
+ *       providerExecuted: false
  *     }),
  *     Prompt.makePart("text", {
  *       text: "The weather in San Francisco is currently 72°F and sunny."
@@ -1150,7 +1161,8 @@ export const assistantMessage = (params: MessageConstructorParams<AssistantMessa
  *           { title: "TypeScript Handbook", url: "https://..." },
  *           { title: "Effective TypeScript", url: "https://..." }
  *         ]
- *       }
+ *       },
+ *       providerExecuted: false
  *     })
  *   ]
  * })
@@ -1624,12 +1636,18 @@ export const fromResponseParts = (parts: ReadonlyArray<Response.AnyPart>): Promp
 
       // Tool Result Parts
       case "tool-result": {
-        toolParts.push(makePart("tool-result", {
+        const toolPart = makePart("tool-result", {
           id: part.id,
           name: part.providerName ?? part.name,
           isFailure: part.isFailure,
-          result: part.encodedResult
-        }))
+          result: part.encodedResult,
+          providerExecuted: part.providerExecuted ?? false
+        })
+        if (part.providerExecuted) {
+          assistantParts.push(toolPart)
+        } else {
+          toolParts.push(toolPart)
+        }
       }
     }
   }