From 9512b6dc7955942c84e24611da2388621b95c831 Mon Sep 17 00:00:00 2001
From: Dex Hunter <i@dex.moe>
Date: Mon, 13 Jul 2026 02:29:51 +0000
Subject: [PATCH] perf(toolshim): compact tool schema JSON

ToolShim includes schemas in text prompts, so pretty-print whitespace scales with every exposed tool. Compact serialization preserves schema semantics while reducing prompt bytes.

Related to aaif-goose/goose#1303.
---
 crates/goose/src/providers/toolshim.rs | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/crates/goose/src/providers/toolshim.rs b/crates/goose/src/providers/toolshim.rs
index 1707d629fdc4..0c56167bfa4f 100644
--- a/crates/goose/src/providers/toolshim.rs
+++ b/crates/goose/src/providers/toolshim.rs
@@ -879,7 +879,7 @@ pub fn format_tool_info(tools: &[Tool]) -> String {
         tool_info.push_str(&format!(
             "Tool Name: {}\nSchema: {}\nDescription: {:?}\n\n",
             tool.name,
-            serde_json::to_string_pretty(&tool.input_schema).unwrap_or_default(),
+            serde_json::to_string(&tool.input_schema).unwrap_or_default(),
             tool.description
         ));
     }
@@ -1062,6 +1062,25 @@ mod tests {
         }
     }
 
+    #[test]
+    fn formats_tool_schemas_as_compact_lossless_json() {
+        let schema = object(
+            json!({"type": "object", "properties": {"query": {"type": "string", "description": "café 工"}, "options": {"type": "object", "properties": {}}}}),
+        );
+        let tool = Tool::new("search".to_string(), "Search records".to_string(), schema);
+
+        let output = format_tool_info(std::slice::from_ref(&tool));
+        let description = format!("\nDescription: {:?}\n\n", tool.description);
+        let schema = output
+            .strip_prefix("Tool Name: search\nSchema: ")
+            .and_then(|value| value.strip_suffix(&description))
+            .unwrap();
+
+        assert!(!schema.contains('\n'));
+        let parsed: Value = serde_json::from_str(schema).unwrap();
+        assert_eq!(parsed, serde_json::to_value(&tool.input_schema).unwrap());
+    }
+
     #[test]
     fn parses_toolshim_backend_values() {
         assert_eq!(