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# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
"""SETA-style multi-tool coding environment backed by E2B."""
from __future__ import annotations
import os
from typing import Any, Optional
from uuid import uuid4
from fastmcp import FastMCP
from openenv.core.env_server.mcp_environment import MCPEnvironment
from openenv.core.env_server.types import Action, Observation
try:
from .e2b_sandbox import E2BSandbox
from ..models import CodingToolsState, CommandResult, EditSpec, TodoItem
except ImportError: # pragma: no cover
from models import CodingToolsState, CommandResult, EditSpec, TodoItem
from server.e2b_sandbox import E2BSandbox
REWARD_FILE = "/home/user/logs/verifier/reward.txt"
class CodingToolsEnvironment(MCPEnvironment):
"""Tool-centric coding environment with one sandbox per episode."""
SUPPORTS_CONCURRENT_SESSIONS = True
def __init__(self):
self._sandbox: Optional[E2BSandbox] = None
self._state = CodingToolsState(episode_id=str(uuid4()), step_count=0)
mcp = FastMCP("coding_tools_env")
@mcp.tool
def bash(command: str, timeout: float | None = 30) -> str:
"""Execute bash commands using the computer instance."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
timeout_value = 30 if timeout is None else float(timeout)
result = self._sandbox.run_shell(command, timeout_s=timeout_value)
self._record("bash", result.ok, result.output, result.error, result.metadata)
return result.output if result.ok else f"ERROR: {result.error}\n{result.output}".strip()
@mcp.tool
def read(file_path: str, offset: int | None = None, limit: int | None = None) -> str:
"""Read file contents using computer instance."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
result = self._sandbox.read_file(file_path=file_path, offset=offset, limit=limit)
self._record("read", result.ok, result.output, result.error, result.metadata)
return result.output if result.ok else f"ERROR: {result.error}"
@mcp.tool
def write(file_path: str, content: str) -> str:
"""Write content to a file using computer instance."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
result = self._sandbox.write_file(file_path=file_path, content=content)
self._record("write", result.ok, result.output, result.error, result.metadata)
return result.output if result.ok else f"ERROR: {result.error}"
@mcp.tool
def edit(
file_path: str,
old_string: str,
new_string: str,
replace_all: bool = False,
) -> str:
"""Perform exact string replacement in a file."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
read_result = self._sandbox.read_file(file_path=file_path)
if not read_result.ok:
self._record("edit", False, "", read_result.error, None)
return f"ERROR: {read_result.error}"
original = read_result.output
if old_string not in original:
self._record("edit", False, "", "old_string not found", None)
return "ERROR: old_string not found"
if replace_all:
updated = original.replace(old_string, new_string)
else:
updated = original.replace(old_string, new_string, 1)
write_result = self._sandbox.write_file(file_path=file_path, content=updated)
ok = write_result.ok
msg = "edit ok" if ok else ""
self._record("edit", ok, msg, write_result.error, {"replace_all": replace_all})
return msg if ok else f"ERROR: {write_result.error}"
@mcp.tool
def multi_edit(file_path: str, edits: list[dict[str, Any]]) -> str:
"""Perform multiple edits on a single file."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
read_result = self._sandbox.read_file(file_path=file_path)
if not read_result.ok:
self._record("multi_edit", False, "", read_result.error, None)
return f"ERROR: {read_result.error}"
text = read_result.output
applied = 0
for raw in edits:
spec = EditSpec.model_validate(raw)
if spec.old_string not in text:
self._record(
"multi_edit",
False,
"",
f"old_string not found: {spec.old_string[:80]}",
{"applied": applied},
)
return f"ERROR: old_string not found: {spec.old_string[:80]}"
if spec.replace_all:
text = text.replace(spec.old_string, spec.new_string)
else:
text = text.replace(spec.old_string, spec.new_string, 1)
applied += 1
write_result = self._sandbox.write_file(file_path=file_path, content=text)
self._record(
"multi_edit",
write_result.ok,
f"applied {applied} edits" if write_result.ok else "",
write_result.error,
{"applied": applied},
)
return f"applied {applied} edits" if write_result.ok else f"ERROR: {write_result.error}"
@mcp.tool
def glob(pattern: str, path: str | None = None) -> str:
"""Find files matching a glob pattern."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
result = self._sandbox.glob_files(pattern=pattern, path=path)
self._record("glob", result.ok, result.output, result.error, result.metadata)
return result.output if result.ok else f"ERROR: {result.error}"
@mcp.tool
def grep(pattern: str, path: str | None = None, include: str | None = None) -> str:
"""Search for patterns in files."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
result = self._sandbox.grep(pattern=pattern, path=path, include=include)
self._record("grep", result.ok, result.output, result.error, result.metadata)
return result.output if result.ok else f"ERROR: {result.error}\n{result.output}".strip()
@mcp.tool
def ls(path: str = ".", ignore: list[str] | None = None) -> str:
"""List files and directories."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
result = self._sandbox.list_dir(path=path, ignore=ignore)
self._record("ls", result.ok, result.output, result.error, result.metadata)
return result.output if result.ok else f"ERROR: {result.error}"
@mcp.tool
def todo_write(todos: list[dict[str, Any]]) -> str:
"""Manage todo list for planning and progress tracking."""
validated = [TodoItem.model_validate(todo) for todo in todos]
in_progress = [item for item in validated if item.status == "in_progress"]
if len(in_progress) > 1:
msg = "ERROR: only one todo item can be in_progress"
self._record("todo_write", False, "", msg, None)
return msg
for item in validated:
if item.status not in {"pending", "in_progress", "completed"}:
msg = f"ERROR: invalid status {item.status}"
self._record("todo_write", False, "", msg, None)
return msg
if item.priority not in {"high", "medium", "low"}:
msg = f"ERROR: invalid priority {item.priority}"
self._record("todo_write", False, "", msg, None)
return msg
self._state.todos = validated
self._record("todo_write", True, f"stored {len(validated)} todos", None, None)
return f"stored {len(validated)} todos"
@mcp.tool
def submit_solution() -> str:
"""Submit solution and run test suite via verify commands."""
if not self._sandbox:
return "Error: environment not reset. Call reset() first."
self._state.submitted = True
if not self._state.verify_commands:
self._state.last_reward = 0.0
self._record(
"submit_solution",
True,
"No verify commands configured. reward=0.0",
None,
{"reward": 0.0, "finished": True},
)
return "No verify commands configured. reward=0.0"
summary = self._run_verify_commands()
self._record(
"submit_solution",
True,
(
f"Verification: {summary['passed']}/{summary['total']} passed; "
f"reward={summary['reward']}"
),
None,
{"reward": summary["reward"], "finished": True},
)
return (
f"Verification: {summary['passed']}/{summary['total']} passed; "
f"reward={summary['reward']}"
)
super().__init__(mcp)
def reset(
self,
seed: Optional[int] = None,
episode_id: Optional[str] = None,
**kwargs: Any,
) -> Observation:
if self._sandbox:
self._sandbox.kill()
self._sandbox = None
api_key = os.environ.get("E2B_API_KEY")
self._state = CodingToolsState(
episode_id=episode_id or str(uuid4()),
step_count=0,
)
if not api_key:
return Observation(
done=True,
reward=None,
metadata={
"status": "error",
"error": "E2B_API_KEY is not set. Configure it before reset.",
},
)
try:
self._sandbox = E2BSandbox(api_key=api_key)
except Exception as exc: # noqa: BLE001
return Observation(
done=True,
reward=None,
metadata={
"status": "error",
"error": f"failed to create E2B sandbox: {type(exc).__name__}: {exc}",
},
)
self._state.sandbox_id = self._sandbox.sandbox_id
setup_commands = _coerce_commands(
kwargs.get("setup", kwargs.get("setup_scripts", []))
)
verify_commands = _coerce_commands(
kwargs.get("verify", kwargs.get("verify_scripts", []))
)
self._state.verify_commands = verify_commands
self._sandbox.run_shell("mkdir -p /home/user/logs/verifier")
if setup_commands:
for command in setup_commands:
result = self._sandbox.run_shell(command, timeout_s=60)
command_result = CommandResult(
tool="setup",
ok=result.ok,
output=result.output,
error=result.error,
metadata={"command": command},
)
self._state.setup_results.append(command_result)
if not result.ok:
return Observation(
done=True,
reward=None,
metadata={
"status": "error",
"sandbox_id": self._state.sandbox_id,
"message": "Setup command failed.",
"setup_results": [
entry.model_dump() for entry in self._state.setup_results
],
},
)
return Observation(
done=False,
reward=None,
metadata={
"status": "ready",
"sandbox_id": self._state.sandbox_id,
"message": "coding_tools_env ready.",
"verify_commands": verify_commands,
"setup_results": [
entry.model_dump() for entry in self._state.setup_results
],
},
)
def _step_impl(
self,
action: Action,
timeout_s: Optional[float] = None,
**_: Any,
) -> Observation:
return Observation(
done=False,
reward=None,
metadata={
"error": (
f"Unknown action type: {type(action).__name__}. "
"Use ListToolsAction or CallToolAction for MCP interactions."
)
},
)
def step(
self,
action: Action,
timeout_s: Optional[float] = None,
**kwargs: Any,
) -> Observation:
self._state.step_count += 1
return super().step(action, timeout_s=timeout_s, **kwargs)
async def step_async(
self,
action: Action,
timeout_s: Optional[float] = None,
**kwargs: Any,
) -> Observation:
self._state.step_count += 1
return await super().step_async(action, timeout_s=timeout_s, **kwargs)
@property
def state(self) -> CodingToolsState:
return self._state
def close(self) -> None:
if self._sandbox:
self._sandbox.kill()
self._sandbox = None
def _record(
self,
tool: str,
ok: bool,
output: str,
error: str | None,
metadata: dict[str, Any] | None,
) -> None:
result = CommandResult(
tool=tool,
ok=ok,
output=output,
error=error,
metadata=metadata or {},
)
self._state.tool_history.append(result)
self._state.last_error = error
def _run_verify_commands(self) -> dict[str, Any]:
self._sandbox.run_shell("mkdir -p /home/user/logs/verifier")
self._state.verify_results = []
passed = 0
for command in self._state.verify_commands:
result = self._sandbox.run_shell(command, timeout_s=120)
record = CommandResult(
tool="verify",
ok=result.ok,
output=result.output,
error=result.error,
metadata={"command": command},
)
self._state.verify_results.append(record)
if result.ok:
passed += 1
total = len(self._state.verify_commands)
reward = _read_reward_override(self._sandbox)
if reward is None:
reward = (passed / total) if total else 0.0
self._state.last_reward = reward
return {"passed": passed, "total": total, "reward": reward}
def _coerce_commands(value: Any) -> list[str]:
if value is None:
return []
if isinstance(value, str):
return [value] if value.strip() else []
return [str(item) for item in value if str(item).strip()]
def _read_reward_override(sandbox: E2BSandbox) -> float | None:
result = sandbox.read_file(REWARD_FILE)
if not result.ok:
return None
raw = (result.output or "").strip()
if not raw:
return None
try:
return float(raw)
except ValueError:
return None
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