Optimize tool summarization (#7938)

Co-authored-by: Michael Neale <michael.neale@gmail.com>
Co-authored-by: Douwe Osinga <douwe@squareup.com>

crates/goose/src/providers/base.rs

@@ -622,6 +622,14 @@ pub trait Provider: Send + Sync {
         false
     }
 
+    /// Whether the provider manages its own conversation context (e.g. CLI
+    /// wrappers like Claude Code or Gemini CLI). When true, goose-side
+    /// context management such as tool-pair summarization is skipped because
+    /// the provider's internal state is the source of truth.
+    fn manages_own_context(&self) -> bool {
+        false
+    }
+
     async fn supports_cache_control(&self) -> bool {
         false
     }

crates/goose/src/providers/claude_code.rs

@@ -637,6 +637,10 @@ impl Provider for ClaudeCodeProvider {
         &self.name
     }
 
+    fn manages_own_context(&self) -> bool {
+        true
+    }
+
     fn get_model_config(&self) -> ModelConfig {
         self.model.clone()
     }

crates/goose/src/providers/gemini_cli.rs

@@ -185,6 +185,10 @@ impl Provider for GeminiCliProvider {
         &self.name
     }
 
+    fn manages_own_context(&self) -> bool {
+        true
+    }
+
     fn get_model_config(&self) -> ModelConfig {
         self.model.clone()
     }