diff --git a/pkg/runner/input.go b/pkg/runner/input.go
index a211ec9d..23228813 100644
--- a/pkg/runner/input.go
+++ b/pkg/runner/input.go
@@ -15,12 +15,14 @@ func (r *Runner) handleInput(callCtx engine.Context, monitor Monitor, env []stri
 	}
 
 	for _, inputToolRef := range inputToolRefs {
-		inputData, err := json.Marshal(map[string]any{
-			"input": input,
-		})
+		data := map[string]any{}
+		_ = json.Unmarshal([]byte(input), &data)
+		data["input"] = input
+		inputData, err := json.Marshal(data)
 		if err != nil {
 			return "", fmt.Errorf("failed to marshal input: %w", err)
 		}
+
 		res, err := r.subCall(callCtx.Ctx, callCtx, monitor, env, inputToolRef.ToolID, string(inputData), "", engine.InputToolCategory)
 		if err != nil {
 			return "", err
diff --git a/pkg/tests/runner2_test.go b/pkg/tests/runner2_test.go
index 27d4c226..93899c84 100644
--- a/pkg/tests/runner2_test.go
+++ b/pkg/tests/runner2_test.go
@@ -55,3 +55,27 @@ Yo dawg`, "")
 	resp, err := r.Chat(context.Background(), nil, prg, nil, "input 1")
 	r.AssertStep(t, resp, err)
 }
+
+func TestInputFilterMoreArgs(t *testing.T) {
+	r := tester.NewRunner(t)
+	prg, err := loader.ProgramFromSource(context.Background(), `
+chat: true
+inputfilters: stuff
+
+Say hi
+
+---
+name: stuff
+params: foo: bar
+params: input: baz
+
+#!/bin/bash
+echo ${FOO}:${INPUT}
+`, "")
+	require.NoError(t, err)
+
+	resp, err := r.Chat(context.Background(), nil, prg, nil, `{"foo":"123"}`)
+	r.AssertStep(t, resp, err)
+	resp, err = r.Chat(context.Background(), nil, prg, nil, `"foo":"123"}`)
+	r.AssertStep(t, resp, err)
+}
diff --git a/pkg/tests/testdata/TestInputFilterMoreArgs/call1-resp.golden b/pkg/tests/testdata/TestInputFilterMoreArgs/call1-resp.golden
new file mode 100644
index 00000000..2861a036
--- /dev/null
+++ b/pkg/tests/testdata/TestInputFilterMoreArgs/call1-resp.golden
@@ -0,0 +1,9 @@
+`{
+  "role": "assistant",
+  "content": [
+    {
+      "text": "TEST RESULT CALL: 1"
+    }
+  ],
+  "usage": {}
+}`
diff --git a/pkg/tests/testdata/TestInputFilterMoreArgs/call1.golden b/pkg/tests/testdata/TestInputFilterMoreArgs/call1.golden
new file mode 100644
index 00000000..30693444
--- /dev/null
+++ b/pkg/tests/testdata/TestInputFilterMoreArgs/call1.golden
@@ -0,0 +1,25 @@
+`{
+  "model": "gpt-4o",
+  "internalSystemPrompt": false,
+  "messages": [
+    {
+      "role": "system",
+      "content": [
+        {
+          "text": "Say hi"
+        }
+      ],
+      "usage": {}
+    },
+    {
+      "role": "user",
+      "content": [
+        {
+          "text": "123:{\"foo\":\"123\"}\n"
+        }
+      ],
+      "usage": {}
+    }
+  ],
+  "chat": true
+}`
diff --git a/pkg/tests/testdata/TestInputFilterMoreArgs/call2-resp.golden b/pkg/tests/testdata/TestInputFilterMoreArgs/call2-resp.golden
new file mode 100644
index 00000000..997ca1b9
--- /dev/null
+++ b/pkg/tests/testdata/TestInputFilterMoreArgs/call2-resp.golden
@@ -0,0 +1,9 @@
+`{
+  "role": "assistant",
+  "content": [
+    {
+      "text": "TEST RESULT CALL: 2"
+    }
+  ],
+  "usage": {}
+}`
diff --git a/pkg/tests/testdata/TestInputFilterMoreArgs/call2.golden b/pkg/tests/testdata/TestInputFilterMoreArgs/call2.golden
new file mode 100644
index 00000000..5a39730d
--- /dev/null
+++ b/pkg/tests/testdata/TestInputFilterMoreArgs/call2.golden
@@ -0,0 +1,25 @@
+`{
+  "model": "gpt-4o",
+  "internalSystemPrompt": false,
+  "messages": [
+    {
+      "role": "system",
+      "content": [
+        {
+          "text": "Say hi"
+        }
+      ],
+      "usage": {}
+    },
+    {
+      "role": "user",
+      "content": [
+        {
+          "text": ":\"foo\":\"123\"}\n"
+        }
+      ],
+      "usage": {}
+    }
+  ],
+  "chat": true
+}`
diff --git a/pkg/tests/testdata/TestInputFilterMoreArgs/step1.golden b/pkg/tests/testdata/TestInputFilterMoreArgs/step1.golden
new file mode 100644
index 00000000..a04d4508
--- /dev/null
+++ b/pkg/tests/testdata/TestInputFilterMoreArgs/step1.golden
@@ -0,0 +1,48 @@
+`{
+  "done": false,
+  "content": "TEST RESULT CALL: 1",
+  "toolID": "inline:",
+  "state": {
+    "continuation": {
+      "state": {
+        "input": "123:{\"foo\":\"123\"}\n",
+        "completion": {
+          "model": "gpt-4o",
+          "internalSystemPrompt": false,
+          "messages": [
+            {
+              "role": "system",
+              "content": [
+                {
+                  "text": "Say hi"
+                }
+              ],
+              "usage": {}
+            },
+            {
+              "role": "user",
+              "content": [
+                {
+                  "text": "123:{\"foo\":\"123\"}\n"
+                }
+              ],
+              "usage": {}
+            },
+            {
+              "role": "assistant",
+              "content": [
+                {
+                  "text": "TEST RESULT CALL: 1"
+                }
+              ],
+              "usage": {}
+            }
+          ],
+          "chat": true
+        }
+      },
+      "result": "TEST RESULT CALL: 1"
+    },
+    "continuationToolID": "inline:"
+  }
+}`
diff --git a/pkg/tests/testdata/TestInputFilterMoreArgs/step2.golden b/pkg/tests/testdata/TestInputFilterMoreArgs/step2.golden
new file mode 100644
index 00000000..aa41f1dd
--- /dev/null
+++ b/pkg/tests/testdata/TestInputFilterMoreArgs/step2.golden
@@ -0,0 +1,48 @@
+`{
+  "done": false,
+  "content": "TEST RESULT CALL: 2",
+  "toolID": "inline:",
+  "state": {
+    "continuation": {
+      "state": {
+        "input": ":\"foo\":\"123\"}\n",
+        "completion": {
+          "model": "gpt-4o",
+          "internalSystemPrompt": false,
+          "messages": [
+            {
+              "role": "system",
+              "content": [
+                {
+                  "text": "Say hi"
+                }
+              ],
+              "usage": {}
+            },
+            {
+              "role": "user",
+              "content": [
+                {
+                  "text": ":\"foo\":\"123\"}\n"
+                }
+              ],
+              "usage": {}
+            },
+            {
+              "role": "assistant",
+              "content": [
+                {
+                  "text": "TEST RESULT CALL: 2"
+                }
+              ],
+              "usage": {}
+            }
+          ],
+          "chat": true
+        }
+      },
+      "result": "TEST RESULT CALL: 2"
+    },
+    "continuationToolID": "inline:"
+  }
+}`