diff --git a/codex-rs/codex-mcp/src/rmcp_client.rs b/codex-rs/codex-mcp/src/rmcp_client.rs
index f4fc8b807..3ba1adcc9 100644
--- a/codex-rs/codex-mcp/src/rmcp_client.rs
+++ b/codex-rs/codex-mcp/src/rmcp_client.rs
@@ -75,7 +75,7 @@ pub(crate) const MCP_TOOLS_LIST_DURATION_METRIC: &str = "codex.mcp.tools.list.du
 pub(crate) const MCP_TOOLS_FETCH_UNCACHED_DURATION_METRIC: &str =
     "codex.mcp.tools.fetch_uncached.duration_ms";
 pub(crate) const DEFAULT_STARTUP_TIMEOUT: Duration = Duration::from_secs(30);
-pub(crate) const DEFAULT_TOOL_TIMEOUT: Duration = Duration::from_secs(120);
+pub(crate) const DEFAULT_TOOL_TIMEOUT: Duration = Duration::from_secs(300);
 
 const UNTRUSTED_CONNECTOR_META_KEYS: &[&str] = &[
     "connector_id",