diff --git a/crates/forge_app/src/utils.rs b/crates/forge_app/src/utils.rs
index 02a21e26e7..0bda391758 100644
--- a/crates/forge_app/src/utils.rs
+++ b/crates/forge_app/src/utils.rs
@@ -253,6 +253,38 @@ fn normalize_schema_keywords(
     }
 }
 
+fn is_supported_openai_string_format(format: &str) -> bool {
+    matches!(
+        format,
+        "date-time"
+            | "time"
+            | "date"
+            | "duration"
+            | "email"
+            | "hostname"
+            | "ipv4"
+            | "ipv6"
+            | "uuid"
+    )
+}
+
+fn normalize_string_format_keyword(
+    map: &mut serde_json::Map<String, serde_json::Value>,
+    strict_mode: bool,
+) {
+    if !strict_mode {
+        return;
+    }
+
+    let Some(format) = map.get("format").and_then(|value| value.as_str()) else {
+        return;
+    };
+
+    if !is_supported_openai_string_format(format) {
+        map.remove("format");
+    }
+}
+
 fn is_object_schema(map: &serde_json::Map<String, serde_json::Value>) -> bool {
     map.get("type")
         .and_then(|value| value.as_str())
@@ -325,6 +357,8 @@ pub fn enforce_strict_schema(schema: &mut serde_json::Value, strict_mode: bool)
                 map.remove("propertyNames");
             }
 
+            normalize_string_format_keyword(map, strict_mode);
+
             let is_object = is_object_schema(map);
 
             // If this looks like an object schema but has no explicit type, add it
@@ -1202,6 +1236,63 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_unsupported_format_is_removed_in_strict_mode() {
+        let mut fixture = json!({
+            "type": "object",
+            "properties": {
+                "url": {
+                    "type": "string",
+                    "format": "uri"
+                }
+            }
+        });
+
+        enforce_strict_schema(&mut fixture, true);
+
+        let expected = json!({
+            "type": "object",
+            "properties": {
+                "url": {
+                    "type": "string"
+                }
+            },
+            "additionalProperties": false,
+            "required": ["url"]
+        });
+
+        assert_eq!(fixture, expected);
+    }
+
+    #[test]
+    fn test_supported_format_is_preserved_in_strict_mode() {
+        let mut fixture = json!({
+            "type": "object",
+            "properties": {
+                "timestamp": {
+                    "type": "string",
+                    "format": "date-time"
+                }
+            }
+        });
+
+        enforce_strict_schema(&mut fixture, true);
+
+        let expected = json!({
+            "type": "object",
+            "properties": {
+                "timestamp": {
+                    "type": "string",
+                    "format": "date-time"
+                }
+            },
+            "additionalProperties": false,
+            "required": ["timestamp"]
+        });
+
+        assert_eq!(fixture, expected);
+    }
+
     /// Integration test that simulates the full Notion MCP workflow:
     /// 1. Schema arrives from MCP server (with propertyNames)
     /// 2. Gets normalized for OpenAI/Codex (propertyNames removed)
diff --git a/crates/forge_repo/src/provider/openai_responses/request.rs b/crates/forge_repo/src/provider/openai_responses/request.rs
index 2ada99c894..96a4a13e6d 100644
--- a/crates/forge_repo/src/provider/openai_responses/request.rs
+++ b/crates/forge_repo/src/provider/openai_responses/request.rs
@@ -379,8 +379,11 @@ mod tests {
         Context as ChatContext, ContextMessage, ModelId, ToolCallId, ToolChoice,
     };
     use forge_app::utils::enforce_strict_schema;
+    use pretty_assertions::assert_eq;
+    use serde_json::json;
 
     use crate::provider::FromDomain;
+    use crate::provider::openai_responses::request::codex_tool_parameters;
 
     #[test]
     fn test_reasoning_config_conversion_with_effort() -> anyhow::Result<()> {
@@ -579,6 +582,37 @@ mod tests {
             .arguments(forge_app::domain::ToolCallArguments::from_json(args))
     }
 
+    #[test]
+    fn test_codex_tool_parameters_removes_unsupported_uri_format() -> anyhow::Result<()> {
+        let fixture = schemars::Schema::try_from(json!({
+            "type": "object",
+            "properties": {
+                "url": {
+                    "type": "string",
+                    "format": "uri"
+                }
+            }
+        }))
+        .unwrap();
+
+        let actual = codex_tool_parameters(&fixture)?;
+
+        let expected = json!({
+            "type": "object",
+            "properties": {
+                "url": {
+                    "type": "string"
+                }
+            },
+            "additionalProperties": false,
+            "required": ["url"]
+        });
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
     #[test]
     fn test_codex_request_tools_snapshot() -> anyhow::Result<()> {
         // Build a schema that exercises OpenAI strict-mode normalization:
diff --git a/crates/forge_repo/src/provider/openai_responses/snapshots/forge_repo__provider__openai_responses__request__tests__openai_responses_all_catalog_tools.snap b/crates/forge_repo/src/provider/openai_responses/snapshots/forge_repo__provider__openai_responses__request__tests__openai_responses_all_catalog_tools.snap
index dfa87b6e10..4762a25a82 100644
--- a/crates/forge_repo/src/provider/openai_responses/snapshots/forge_repo__provider__openai_responses__request__tests__openai_responses_all_catalog_tools.snap
+++ b/crates/forge_repo/src/provider/openai_responses/snapshots/forge_repo__provider__openai_responses__request__tests__openai_responses_all_catalog_tools.snap
@@ -12,7 +12,6 @@ expression: actual.tools
         "end_line": {
           "anyOf": [
             {
-              "format": "int32",
               "type": "integer"
             },
             {
@@ -33,7 +32,6 @@ expression: actual.tools
         "start_line": {
           "anyOf": [
             {
-              "format": "int32",
               "type": "integer"
             },
             {
@@ -94,7 +92,6 @@ expression: actual.tools
         "-A": {
           "anyOf": [
             {
-              "format": "uint32",
               "minimum": 0,
               "type": "integer"
             },
@@ -107,7 +104,6 @@ expression: actual.tools
         "-B": {
           "anyOf": [
             {
-              "format": "uint32",
               "minimum": 0,
               "type": "integer"
             },
@@ -120,7 +116,6 @@ expression: actual.tools
         "-C": {
           "anyOf": [
             {
-              "format": "uint32",
               "minimum": 0,
               "type": "integer"
             },
@@ -166,7 +161,6 @@ expression: actual.tools
         "head_limit": {
           "anyOf": [
             {
-              "format": "uint32",
               "minimum": 0,
               "type": "integer"
             },
@@ -190,7 +184,6 @@ expression: actual.tools
         "offset": {
           "anyOf": [
             {
-              "format": "uint32",
               "minimum": 0,
               "type": "integer"
             },