fix: restore terminal and file tools in worktrees

Root cause: terminal availability checks still imported minisweagent for the
local backend even though local/singularity now use Hermes wrappers directly.
In git worktrees, the local submodule path may also be an empty placeholder,
so direct path insertion could miss the populated mini-swe-agent checkout.

This change:
- adds a helper to discover mini-swe-agent from the current checkout or the
  main checkout behind a worktree
- uses that helper in terminal_tool and mini_swe_runner
- stops requiring minisweagent for the local backend requirements check
- adds regression tests and validates terminal/file tool resolution again

mini_swe_runner.py

@@ -42,10 +42,11 @@ from dotenv import load_dotenv
 # Load environment variables
 load_dotenv()
 
-# Add mini-swe-agent to path if not installed
+# Add mini-swe-agent to path if not installed. In git worktrees the populated
-mini_swe_path = Path(__file__).parent / "mini-swe-agent" / "src"
+# submodule may live in the main checkout rather than the worktree itself.
-if mini_swe_path.exists():
+from minisweagent_path import ensure_minisweagent_on_path
-    sys.path.insert(0, str(mini_swe_path))
+
+ensure_minisweagent_on_path(Path(__file__).resolve().parent)
 
 
 # ============================================================================

minisweagent_path.py

@@ -0,0 +1,92 @@
+"""Helpers for locating the mini-swe-agent source tree.
+
+Hermes often runs from git worktrees. In that layout the worktree root may have
+an empty ``mini-swe-agent/`` placeholder while the real populated submodule
+lives under the main checkout that owns the shared ``.git`` directory.
+
+These helpers locate a usable ``mini-swe-agent/src`` directory and optionally
+prepend it to ``sys.path`` so imports like ``import minisweagent`` work from
+both normal checkouts and worktrees.
+"""
+
+from __future__ import annotations
+
+import importlib.util
+import sys
+from pathlib import Path
+from typing import Optional
+
+
+def _read_gitdir(repo_root: Path) -> Optional[Path]:
+    """Resolve the gitdir referenced by ``repo_root/.git`` when it is a file."""
+    git_marker = repo_root / ".git"
+    if not git_marker.is_file():
+        return None
+
+    try:
+        raw = git_marker.read_text(encoding="utf-8").strip()
+    except OSError:
+        return None
+
+    prefix = "gitdir:"
+    if not raw.lower().startswith(prefix):
+        return None
+
+    target = raw[len(prefix):].strip()
+    gitdir = Path(target)
+    if not gitdir.is_absolute():
+        gitdir = (repo_root / gitdir).resolve()
+    else:
+        gitdir = gitdir.resolve()
+    return gitdir
+
+
+def discover_minisweagent_src(repo_root: Optional[Path] = None) -> Optional[Path]:
+    """Return the best available ``mini-swe-agent/src`` path, if any.
+
+    Search order:
+    1. Current checkout/worktree root
+    2. Main checkout that owns the shared ``.git`` directory (for worktrees)
+    """
+    repo_root = (repo_root or Path(__file__).resolve().parent).resolve()
+
+    candidates: list[Path] = [repo_root / "mini-swe-agent" / "src"]
+
+    gitdir = _read_gitdir(repo_root)
+    if gitdir is not None:
+        # Worktree layout: <main>/.git/worktrees/<name>
+        if len(gitdir.parents) >= 3 and gitdir.parent.name == "worktrees":
+            candidates.append(gitdir.parents[2] / "mini-swe-agent" / "src")
+        # Direct checkout with .git file pointing elsewhere
+        elif gitdir.name == ".git":
+            candidates.append(gitdir.parent / "mini-swe-agent" / "src")
+
+    seen = set()
+    for candidate in candidates:
+        candidate = candidate.resolve()
+        if candidate in seen:
+            continue
+        seen.add(candidate)
+        if candidate.exists() and candidate.is_dir():
+            return candidate
+
+    return None
+
+
+def ensure_minisweagent_on_path(repo_root: Optional[Path] = None) -> Optional[Path]:
+    """Ensure ``minisweagent`` is importable by prepending its src dir to sys.path.
+
+    Returns the inserted/discovered path, or ``None`` if the package is already
+    importable or no local source tree could be found.
+    """
+    if importlib.util.find_spec("minisweagent") is not None:
+        return None
+
+    src = discover_minisweagent_src(repo_root)
+    if src is None:
+        return None
+
+    src_str = str(src)
+    if src_str not in sys.path:
+        sys.path.insert(0, src_str)
+    return src

tests/test_minisweagent_path.py

@@ -0,0 +1,34 @@
+"""Tests for minisweagent_path.py."""
+
+from pathlib import Path
+
+from minisweagent_path import discover_minisweagent_src
+
+
+def test_discover_minisweagent_src_in_current_checkout(tmp_path):
+    repo = tmp_path / "repo"
+    src = repo / "mini-swe-agent" / "src"
+    src.mkdir(parents=True)
+
+    assert discover_minisweagent_src(repo) == src.resolve()
+
+
+def test_discover_minisweagent_src_falls_back_from_worktree_to_main_checkout(tmp_path):
+    main_repo = tmp_path / "main-repo"
+    (main_repo / ".git" / "worktrees" / "wt1").mkdir(parents=True)
+    main_src = main_repo / "mini-swe-agent" / "src"
+    main_src.mkdir(parents=True)
+
+    worktree = tmp_path / "worktree"
+    worktree.mkdir()
+    (worktree / ".git").write_text(f"gitdir: {main_repo / '.git' / 'worktrees' / 'wt1'}\n", encoding="utf-8")
+    (worktree / "mini-swe-agent").mkdir()  # empty placeholder, no src/
+
+    assert discover_minisweagent_src(worktree) == main_src.resolve()
+
+
+def test_discover_minisweagent_src_returns_none_when_missing(tmp_path):
+    repo = tmp_path / "repo"
+    repo.mkdir()
+
+    assert discover_minisweagent_src(repo) is None

tests/tools/test_terminal_tool_requirements.py

@@ -0,0 +1,28 @@
+"""Tests for terminal/file tool availability in local dev environments."""
+
+import importlib
+
+from model_tools import get_tool_definitions
+
+terminal_tool_module = importlib.import_module("tools.terminal_tool")
+
+
+class TestTerminalRequirements:
+    def test_local_backend_does_not_require_minisweagent_package(self, monkeypatch):
+        monkeypatch.setattr(
+            terminal_tool_module,
+            "_get_env_config",
+            lambda: {"env_type": "local"},
+        )
+        assert terminal_tool_module.check_terminal_requirements() is True
+
+    def test_terminal_and_file_tools_resolve_for_local_backend(self, monkeypatch):
+        monkeypatch.setattr(
+            terminal_tool_module,
+            "_get_env_config",
+            lambda: {"env_type": "local"},
+        )
+        tools = get_tool_definitions(enabled_toolsets=["terminal", "file"], quiet_mode=True)
+        names = {tool["function"]["name"] for tool in tools}
+        assert "terminal" in names
+        assert {"read_file", "write_file", "patch", "search_files"}.issubset(names)

tools/terminal_tool.py

@@ -26,6 +26,7 @@ Usage:
     result = terminal_tool("python server.py", background=True)
 """
 
+import importlib.util
 import json
 import logging
 import os
@@ -53,10 +54,11 @@ logger = logging.getLogger(__name__)
 from tools.interrupt import set_interrupt as set_interrupt_event, is_interrupted, _interrupt_event
 
 
-# Add mini-swe-agent to path if not installed
+# Add mini-swe-agent to path if not installed. In git worktrees the populated
-mini_swe_path = Path(__file__).parent.parent / "mini-swe-agent" / "src"
+# submodule may live in the main checkout rather than the worktree itself.
-if mini_swe_path.exists():
+from minisweagent_path import ensure_minisweagent_on_path
-    sys.path.insert(0, str(mini_swe_path))
+
+ensure_minisweagent_on_path(Path(__file__).resolve().parent.parent)
 
 
 # =============================================================================
@@ -1124,46 +1126,62 @@ def terminal_tool(
 
 
 def check_terminal_requirements() -> bool:
-    """Check if all requirements for the terminal tool are met."""
+    """Check if all requirements for the terminal tool are met.
+
+    Important: local and singularity backends now use Hermes' own environment
+    wrappers directly and do not require the ``minisweagent`` Python package to
+    be installed. Docker and Modal still rely on mini-swe-agent internals.
+    """
     config = _get_env_config()
     env_type = config["env_type"]
 
     try:
         if env_type == "local":
-            from minisweagent.environments.local import LocalEnvironment
+            return bool(
-            return True
+                shutil.which("bash")
+                or ("/usr/bin/bash" if Path("/usr/bin/bash").is_file() else None)
+                or ("/bin/bash" if Path("/bin/bash").is_file() else None)
+                or (os.environ.get("SHELL") if os.environ.get("SHELL") else None)
+                or ("/bin/sh" if Path("/bin/sh").is_file() else None)
+            )
+
         elif env_type == "docker":
-            from minisweagent.environments.docker import DockerEnvironment
+            ensure_minisweagent_on_path(Path(__file__).resolve().parent.parent)
+            if importlib.util.find_spec("minisweagent") is None:
+                logger.error("mini-swe-agent is required for docker terminal backend but is not importable")
+                return False
             # Check if docker is available (use find_docker for macOS PATH issues)
             from tools.environments.docker import find_docker
-            import subprocess
             docker = find_docker()
             if not docker:
                 logger.error("Docker executable not found in PATH or common install locations")
                 return False
             result = subprocess.run([docker, "version"], capture_output=True, timeout=5)
             return result.returncode == 0
+
         elif env_type == "singularity":
-            from minisweagent.environments.singularity import SingularityEnvironment
-            # Check if singularity/apptainer is available
-            import subprocess
-            import shutil
             executable = shutil.which("apptainer") or shutil.which("singularity")
             if executable:
                 result = subprocess.run([executable, "--version"], capture_output=True, timeout=5)
                 return result.returncode == 0
             return False
+
         elif env_type == "ssh":
-            from tools.environments.ssh import SSHEnvironment
             # Check that host and user are configured
             return bool(config.get("ssh_host")) and bool(config.get("ssh_user"))
+
         elif env_type == "modal":
-            from minisweagent.environments.extra.swerex_modal import SwerexModalEnvironment
+            ensure_minisweagent_on_path(Path(__file__).resolve().parent.parent)
+            if importlib.util.find_spec("minisweagent") is None:
+                logger.error("mini-swe-agent is required for modal terminal backend but is not importable")
+                return False
             # Check for modal token
             return os.getenv("MODAL_TOKEN_ID") is not None or Path.home().joinpath(".modal.toml").exists()
+
         elif env_type == "daytona":
             from daytona import Daytona
             return os.getenv("DAYTONA_API_KEY") is not None
+
         else:
             return False
     except Exception as e: