diff --git a/crates/language_models/src/provider/ollama.rs b/crates/language_models/src/provider/ollama.rs
index 6341baa6f36db3..02d2a1d6d6e498 100644
--- a/crates/language_models/src/provider/ollama.rs
+++ b/crates/language_models/src/provider/ollama.rs
@@ -381,10 +381,13 @@ impl OllamaLanguageModel {
                                 thinking = Some(text)
                             }
                             MessageContent::ToolUse(tool_use) => {
-                                tool_calls.push(OllamaToolCall::Function(OllamaFunctionCall {
-                                    name: tool_use.name.to_string(),
-                                    arguments: tool_use.input,
-                                }));
+                                tool_calls.push(OllamaToolCall {
+                                    id: Some(tool_use.id.to_string()),
+                                    function: OllamaFunctionCall {
+                                        name: tool_use.name.to_string(),
+                                        arguments: tool_use.input,
+                                    },
+                                });
                             }
                             _ => (),
                         }
@@ -575,25 +578,23 @@ fn map_to_language_model_completion_events(
                     }
 
                     if let Some(tool_call) = tool_calls.and_then(|v| v.into_iter().next()) {
-                        match tool_call {
-                            OllamaToolCall::Function(function) => {
-                                let tool_id = format!(
-                                    "{}-{}",
-                                    &function.name,
-                                    TOOL_CALL_COUNTER.fetch_add(1, Ordering::Relaxed)
-                                );
-                                let event =
-                                    LanguageModelCompletionEvent::ToolUse(LanguageModelToolUse {
-                                        id: LanguageModelToolUseId::from(tool_id),
-                                        name: Arc::from(function.name),
-                                        raw_input: function.arguments.to_string(),
-                                        input: function.arguments,
-                                        is_input_complete: true,
-                                    });
-                                events.push(Ok(event));
-                                state.used_tools = true;
-                            }
-                        }
+                        let OllamaToolCall { id, function } = tool_call;
+                        let id = id.unwrap_or_else(|| {
+                            format!(
+                                "{}-{}",
+                                &function.name,
+                                TOOL_CALL_COUNTER.fetch_add(1, Ordering::Relaxed)
+                            )
+                        });
+                        let event = LanguageModelCompletionEvent::ToolUse(LanguageModelToolUse {
+                            id: LanguageModelToolUseId::from(id),
+                            name: Arc::from(function.name),
+                            raw_input: function.arguments.to_string(),
+                            input: function.arguments,
+                            is_input_complete: true,
+                        });
+                        events.push(Ok(event));
+                        state.used_tools = true;
                     } else if !content.is_empty() {
                         events.push(Ok(LanguageModelCompletionEvent::Text(content)));
                     }
diff --git a/crates/ollama/src/ollama.rs b/crates/ollama/src/ollama.rs
index 0ed3b6da17d952..f6614379fa9998 100644
--- a/crates/ollama/src/ollama.rs
+++ b/crates/ollama/src/ollama.rs
@@ -102,9 +102,11 @@ pub enum ChatMessage {
 }
 
 #[derive(Serialize, Deserialize, Debug)]
-#[serde(rename_all = "lowercase")]
-pub enum OllamaToolCall {
-    Function(OllamaFunctionCall),
+pub struct OllamaToolCall {
+    // TODO: Remove `Option` after most users have updated to Ollama v0.12.10,
+    // which was released on the 4th of November 2025
+    pub id: Option<String>,
+    pub function: OllamaFunctionCall,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -444,6 +446,7 @@ mod tests {
                 "content": "",
                 "tool_calls": [
                     {
+                        "id": "call_llama3.2:3b_145155",
                         "function": {
                             "name": "weather",
                             "arguments": {
@@ -479,6 +482,56 @@ mod tests {
         }
     }
 
+    // Backwards compatibility with Ollama versions prior to v0.12.10 November 2025
+    // This test is a copy of `parse_tool_call()` with the `id` field omitted.
+    #[test]
+    fn parse_tool_call_pre_0_12_10() {
+        let response = serde_json::json!({
+            "model": "llama3.2:3b",
+            "created_at": "2025-04-28T20:02:02.140489Z",
+            "message": {
+                "role": "assistant",
+                "content": "",
+                "tool_calls": [
+                    {
+                        "function": {
+                            "name": "weather",
+                            "arguments": {
+                                "city": "london",
+                            }
+                        }
+                    }
+                ]
+            },
+            "done_reason": "stop",
+            "done": true,
+            "total_duration": 2758629166u64,
+            "load_duration": 1770059875,
+            "prompt_eval_count": 147,
+            "prompt_eval_duration": 684637583,
+            "eval_count": 16,
+            "eval_duration": 302561917,
+        });
+
+        let result: ChatResponseDelta = serde_json::from_value(response).unwrap();
+        match result.message {
+            ChatMessage::Assistant {
+                content,
+                tool_calls: Some(tool_calls),
+                images: _,
+                thinking,
+            } => {
+                assert!(content.is_empty());
+                assert!(thinking.is_none());
+
+                // When the `Option` around `id` is removed, this test should complain
+                // and be subsequently deleted in favor of `parse_tool_call()`
+                assert!(tool_calls.first().is_some_and(|call| call.id.is_none()))
+            }
+            _ => panic!("Deserialized wrong role"),
+        }
+    }
+
     #[test]
     fn parse_show_model() {
         let response = serde_json::json!({