Add MCP server support and long paste handling

config.json

@@ -1,8 +1,8 @@
 {
   "model": null,
-  "max_iters": 20,
-  "lm": "openrouter/anthropic/claude-3.5-sonnet",
-  "sub_lm": "openrouter/openai/gpt-4.1",
+  "max_iters": 50,
+  "lm": "openrouter/anthropic/claude-sonnet-4.5",
+  "sub_lm": "openrouter/openai/gpt-5-mini",
   "api_base": "https://openrouter.ai/api/v1",
   "max_tokens": 32000,
   "max_output_chars": 100000,

nanocode.py

@@ -2,6 +2,9 @@ import os
 import re
 import glob as globlib
 import subprocess
+import shlex
+import json
+import tempfile
 from modaic import PrecompiledProgram, PrecompiledConfig
 import dspy
 from dspy.utils.callback import BaseCallback
@@ -24,6 +27,16 @@ MAGENTA = "\033[35m"
 
 # --- Display utilities ---
 
+LONG_PASTE_THRESHOLD = int(os.environ.get("NANOCODE_LONG_PASTE_THRESHOLD", "4000"))
+
+
+def save_long_paste(text: str) -> str:
+    fd, path = tempfile.mkstemp(prefix="nanocode_paste_", suffix=".txt")
+    with os.fdopen(fd, "w") as handle:
+        handle.write(text)
+    return path
+
+
 
 def separator():
     """Return a horizontal separator line that fits the terminal width."""
@@ -264,9 +277,9 @@ class ToolLoggingCallback(BaseCallback):
 
 
 class RLMCodingConfig(PrecompiledConfig):
-    max_iters: int = 20
-    lm: str = "openrouter/anthropic/claude-3.5-sonnet"  # Default fallback
-    sub_lm: str = "openrouter/openai/gpt-4.1"  # Default fallback
+    max_iters: int = 50
+    lm: str = "openrouter/anthropic/claude-sonnet-4.5"
+    sub_lm: str = "openrouter/openai/gpt-5-mini"
     api_base: str = "https://openrouter.ai/api/v1"
     max_tokens: int = 32000
     max_output_chars: int = 100000
@@ -291,13 +304,13 @@ class RLMCodingProgram(PrecompiledProgram):
 
         # tool logging for introspections on multi-turn conversations
         dspy.settings.configure(callbacks=[ToolLoggingCallback()])
-        lm = dspy.LM(
+        self.lm = dspy.LM(
             self.config.lm,
             api_base=self.config.api_base,
             max_tokens=self.config.max_tokens,
             track_usage=self.config.track_usage,
         )
-        sub_lm = dspy.LM(
+        self.sub_lm = dspy.LM(
             self.config.sub_lm,
             api_base=self.config.api_base,
             max_tokens=self.config.max_tokens,
@@ -305,14 +318,13 @@ class RLMCodingProgram(PrecompiledProgram):
         )
         agent = dspy.RLM(
             CodingAssistant,
-            sub_lm=sub_lm,
+            sub_lm=self.sub_lm,
             tools=self.tools,
             max_output_chars=self.config.max_output_chars,
             max_iterations=self.config.max_iters,
             verbose=self.config.verbose,
         )
-
-        agent.set_lm(lm)
+        agent.set_lm(self.lm)
         self.agent = agent
 
     def forward(self, task: str) -> str:
@@ -324,13 +336,29 @@ class RLMCodingProgram(PrecompiledProgram):
 
     def set_tool(self, name: str, tool: callable):
         self.tools[name] = tool
+        self.reload_repl_tools()
 
     def remove_tool(self, name: str):
+        if name in self.tools:
             del self.tools[name]
+            self.reload_repl_tools()
+
+    def reload_repl_tools(
+        self,
+    ):  # we need to create a new instance for tool mutations to be passed back into the REPL
+        new_instance = dspy.RLM(
+            CodingAssistant,
+            sub_lm=self.sub_lm,
+            tools=self.tools,
+            max_output_chars=self.config.max_output_chars,
+            max_iterations=self.config.max_iters,
+            verbose=self.config.verbose,
+        )
+        new_instance.set_lm(self.lm)
+        self.agent = new_instance
+
 
 def main():
-    model = os.getenv("MODEL")
-    if model is None:
     model = select_model()
 
     # Add openrouter/ prefix if not already present
@@ -348,12 +376,35 @@ def main():
     # Conversation history for context
     history = []
 
+    # MCP servers registry
+    mcp_servers = {}
+
+    def register_mcp_server(name, server):
+        tool_names = []
+        for tool in server.tools:
+            tool_name = f"{name}_{tool.__name__}"
+            agent.set_tool(tool_name, tool)
+            tool_names.append(tool_name)
+        return tool_names
+
     while True:
         try:
             print(separator())
             user_input = input(f"{BOLD}{BLUE}❯{RESET} ").strip()
             print(separator())
 
+            tmp_paste_path = None
+            if len(user_input) > LONG_PASTE_THRESHOLD:
+                tmp_paste_path = save_long_paste(user_input)
+                print(
+                    f"{YELLOW}⏺ Long paste detected ({len(user_input)} chars). Saved to {tmp_paste_path}{RESET}"
+                )
+                user_input = (
+                    f"The user pasted a long input ({len(user_input)} chars). "
+                    f"It has been saved to {tmp_paste_path}. "
+                    "Use read_file to view it. The file will be deleted after this response."
+                )
+
             if not user_input:
                 continue
             if user_input in ("/q", "exit"):
@@ -377,16 +428,32 @@ def main():
                     continue
                 elif choice in AVAILABLE_MODELS:
                     name, model_id = AVAILABLE_MODELS[choice]
-                    new_model = model_id if model_id.startswith("openrouter/") else f"openrouter/{model_id}"
+                    new_model = (
+                        model_id
+                        if model_id.startswith("openrouter/")
+                        else f"openrouter/{model_id}"
+                    )
                     config.lm = new_model
                     agent = RLMCodingProgram(config)
+                    for server_name, info in mcp_servers.items():
+                        info["tools"] = register_mcp_server(server_name, info["server"])
                     print(f"{GREEN}⏺ Switched to: {name} ({new_model}){RESET}")
                 elif choice == "c":
-                    custom_model = input(f"{BOLD}{BLUE}❯{RESET} Enter model ID: ").strip()
+                    custom_model = input(
+                        f"{BOLD}{BLUE}❯{RESET} Enter model ID: "
+                    ).strip()
                     if custom_model:
-                        new_model = custom_model if custom_model.startswith("openrouter/") else f"openrouter/{custom_model}"
+                        new_model = (
+                            custom_model
+                            if custom_model.startswith("openrouter/")
+                            else f"openrouter/{custom_model}"
+                        )
                         config.lm = new_model
                         agent = RLMCodingProgram(config)
+                        for server_name, info in mcp_servers.items():
+                            info["tools"] = register_mcp_server(
+                                server_name, info["server"]
+                            )
                         print(f"{GREEN}⏺ Switched to custom model: {new_model}{RESET}")
                     else:
                         print(f"{RED}⏺ Invalid model ID, keeping current model{RESET}")
@@ -394,6 +461,97 @@ def main():
                     print(f"{RED}⏺ Invalid choice, keeping current model{RESET}")
                 continue
 
+            if user_input.startswith("/add-mcp"):
+                parts = shlex.split(user_input)
+                args = parts[1:]
+                if not args:
+                    print(
+                        f"{YELLOW}⏺ Usage: /add-mcp <name> <server> [--auth <auth>|--oauth] [--headers '<json>'] [--auto-auth|--no-auto-auth]{RESET}"
+                    )
+                    continue
+
+                name = None
+                auth = None
+                headers = None
+                auto_auth = None
+                positional = []
+                i = 0
+                while i < len(args):
+                    if args[i] in ("--name", "-n") and i + 1 < len(args):
+                        name = args[i + 1]
+                        i += 2
+                    elif args[i].startswith("--auth="):
+                        auth = args[i].split("=", 1)[1]
+                        i += 1
+                    elif args[i] == "--auth" and i + 1 < len(args):
+                        auth = args[i + 1]
+                        i += 2
+                    elif args[i] == "--oauth":
+                        auth = "oauth"
+                        i += 1
+                    elif args[i] == "--auto-auth":
+                        auto_auth = True
+                        i += 1
+                    elif args[i] == "--no-auto-auth":
+                        auto_auth = False
+                        i += 1
+                    elif args[i].startswith("--headers="):
+                        headers = json.loads(args[i].split("=", 1)[1])
+                        i += 1
+                    elif args[i] == "--headers" and i + 1 < len(args):
+                        headers = json.loads(args[i + 1])
+                        i += 2
+                    else:
+                        positional.append(args[i])
+                        i += 1
+
+                server_cmd = None
+                if positional:
+                    if name is None and len(positional) >= 2:
+                        name = positional[0]
+                        server_cmd = " ".join(positional[1:])
+                    else:
+                        server_cmd = " ".join(positional)
+
+                if not server_cmd:
+                    print(
+                        f"{YELLOW}⏺ Usage: /add-mcp <name> <server> [--auth <auth>|--oauth] [--headers '<json>'] [--auto-auth|--no-auto-auth]{RESET}"
+                    )
+                    continue
+
+                if not name:
+                    name = re.sub(r"[^a-zA-Z0-9_]+", "_", server_cmd).strip("_")
+                    if not name:
+                        name = f"mcp_{len(mcp_servers) + 1}"
+
+                if name in mcp_servers:
+                    for tool_name in mcp_servers[name]["tools"]:
+                        agent.remove_tool(tool_name)
+
+                try:
+                    from mcp2py import load
+
+                    kwargs = {}
+                    if auth is not None:
+                        kwargs["auth"] = auth
+                    if headers:
+                        kwargs["headers"] = headers
+                    if auto_auth is not None:
+                        kwargs["auto_auth"] = auto_auth
+
+                    server = load(server_cmd, **kwargs)
+                    tool_names = register_mcp_server(name, server)
+                    mcp_servers[name] = {"server": server, "tools": tool_names}
+
+                    print(
+                        f"{GREEN}⏺ Added MCP server '{name}' with {len(tool_names)} tools{RESET}"
+                    )
+                    print(f"{GREEN}⏺ Tools: {list(agent.tools.keys())}{RESET}")
+                except Exception as err:
+                    print(f"{RED}⏺ Failed to add MCP server: {err}{RESET}")
+
+                continue
+
             # Build context from history
             context = f"Working directory: {os.getcwd()}\n"
             if history:
@@ -406,7 +564,14 @@ def main():
             print(f"\n{CYAN}⏺{RESET} Thinking...", flush=True)
 
             # Run the RLM agent
+            try:
                 result = agent(task=task)
+            finally:
+                if tmp_paste_path:
+                    try:
+                        os.remove(tmp_paste_path)
+                    except OSError:
+                        pass
 
             # Display the answer
             print(f"\n{CYAN}⏺{RESET} {render_markdown(result.answer)}")
@@ -430,5 +595,5 @@ def main():
 
 if __name__ == "__main__":
     agent = RLMCodingProgram(RLMCodingConfig())
-    agent.push_to_hub(MODAIC_REPO_PATH, commit_message="Switch to RLM instead of ReAct", tag="v0.0.3")
+    agent.push_to_hub(MODAIC_REPO_PATH, commit_message="Add MCP server support and long paste handling", tag="v0.0.4")
     #main()

program.json

@@ -29,7 +29,7 @@
       ]
     },
     "lm": {
-      "model": "openrouter/anthropic/claude-3.5-sonnet",
+      "model": "openrouter/anthropic/claude-sonnet-4.5",
       "model_type": "chat",
       "cache": true,
       "num_retries": 3,
@@ -68,7 +68,7 @@
       ]
     },
     "lm": {
-      "model": "openrouter/anthropic/claude-3.5-sonnet",
+      "model": "openrouter/anthropic/claude-sonnet-4.5",
       "model_type": "chat",
       "cache": true,
       "num_retries": 3,

pyproject.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.13"
-dependencies = ["dspy>=3.1.2", "modaic>=0.10.4"]
+dependencies = ["dspy>=3.1.2", "fastmcp>=2.14.3", "mcp2py>=0.6.0", "modaic>=0.10.4"]