feat(tools): register 5 LSP tools as client-side with schemas

- lsp_definition, lsp_references, lsp_hover, lsp_diagnostics, lsp_symbols
  added to CLIENT_TOOLS in tool_dispatch.rs
- Tool schemas added to build_tool_definitions() for Mistral conversations
- LSP tools use path/line/column/query parameters

src/grpc/session.rs

@@ -484,6 +484,15 @@ you also have access to server-side tools: search_archive, search_web, research,
             ("list_directory", "List files and directories. Use path for the directory (default: project root) and optional depth."),
         ];
 
+        // LSP tools — use path, line, column for navigation
+        let lsp_tools = vec![
+            ("lsp_definition", "Go to the definition of the symbol at the given position. Returns file:line:column."),
+            ("lsp_references", "Find all references to the symbol at the given position."),
+            ("lsp_hover", "Get type information and documentation for the symbol at the given position."),
+            ("lsp_diagnostics", "Get compilation errors and warnings for a file."),
+            ("lsp_symbols", "List symbols in a file (document outline) or search workspace symbols. Use path for a file, or query for workspace search."),
+        ];
+
         for (name, desc) in client_tools {
             tools.push(mistralai_client::v1::agents::AgentTool::function(
                 name.into(),
@@ -504,6 +513,22 @@ you also have access to server-side tools: search_archive, search_web, research,
             ));
         }
 
+        for (name, desc) in lsp_tools {
+            tools.push(mistralai_client::v1::agents::AgentTool::function(
+                name.into(),
+                desc.into(),
+                serde_json::json!({
+                    "type": "object",
+                    "properties": {
+                        "path": { "type": "string", "description": "File path" },
+                        "line": { "type": "integer", "description": "1-based line number" },
+                        "column": { "type": "integer", "description": "1-based column number" },
+                        "query": { "type": "string", "description": "Symbol search query (for workspace symbols)" }
+                    }
+                }),
+            ));
+        }
+
         tools
     }
 

src/orchestrator/tool_dispatch.rs

@@ -11,6 +11,12 @@ const CLIENT_TOOLS: &[&str] = &[
     "bash",
     "list_directory",
     "ask_user",
+    // LSP tools (client-side, future: sidecar)
+    "lsp_definition",
+    "lsp_references",
+    "lsp_hover",
+    "lsp_diagnostics",
+    "lsp_symbols",
 ];
 
 /// Route a tool call to server or client.
@@ -37,6 +43,15 @@ mod tests {
         assert_eq!(route("ask_user"), ToolSide::Client);
     }
 
+    #[test]
+    fn test_lsp_tools_are_client_side() {
+        assert_eq!(route("lsp_definition"), ToolSide::Client);
+        assert_eq!(route("lsp_references"), ToolSide::Client);
+        assert_eq!(route("lsp_hover"), ToolSide::Client);
+        assert_eq!(route("lsp_diagnostics"), ToolSide::Client);
+        assert_eq!(route("lsp_symbols"), ToolSide::Client);
+    }
+
     #[test]
     fn test_server_tools() {
         assert_eq!(route("search_archive"), ToolSide::Server);