feat(*): t3code-mcp connector - machines, projects, dispatch, wait, interrupt

This commit is contained in:
hh
2026-08-29 20:36:21 +02:00
commit c86f34c9fa
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import logging
from t3code_mcp.config import Settings, load_machines
from t3code_mcp.server import Registry, build_server
def main() -> None:
logging.basicConfig(level=logging.INFO, format="%(asctime)s %(name)s %(message)s")
settings = Settings()
machines = load_machines(settings.config)
logging.getLogger(__name__).info(
"t3code-mcp: machines %s, listening on %s:%s",
list(machines),
settings.host,
settings.port,
)
server = build_server(Registry(machines))
server.run(transport="http", host=settings.host, port=settings.port, path="/mcp")
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from t3code_mcp import main
main()
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"""Machines and their project allowlists, from TOML; tokens only from env.
```toml
[machines.mac]
url = "http://100.65.207.48:3773"
token_env = "T3_MAC_TOKEN"
projects = ["t3-smoke", "/Users/h/projects/openprise/beaver/*"]
model = "claudeAgent/claude-opus-5"
options = { effort = "high", contextWindow = "1m" }
```
`projects` entries are `fnmatch` patterns matched against a project's title
and its workspace root. A machine without `model` uses the project default.
"""
from __future__ import annotations
import fnmatch
import os
import tomllib
from pathlib import Path
from typing import Any, Self
from pydantic import BaseModel, ConfigDict, Field, model_validator
from pydantic_settings import BaseSettings, SettingsConfigDict
class ModelSpec(BaseModel):
"""`instance/model` plus provider options, as T3's `ModelSelection`."""
model_config = ConfigDict(frozen=True)
instance: str
model: str
options: dict[str, str] = Field(default_factory=dict)
@classmethod
def parse(cls, text: str, options: dict[str, str] | None = None) -> Self:
instance, sep, model = text.partition("/")
if not sep or not instance or not model:
msg = f"model must be `instance/model`, got {text!r}"
raise ValueError(msg)
return cls(instance=instance, model=model, options=options or {})
@classmethod
def from_selection(cls, selection: dict[str, Any]) -> Self:
options = {o["id"]: str(o["value"]) for o in selection.get("options") or []}
return cls(
instance=selection["instanceId"], model=selection["model"], options=options
)
def selection(self) -> dict[str, Any]:
wire: dict[str, Any] = {"instanceId": self.instance, "model": self.model}
if self.options:
wire["options"] = [{"id": k, "value": v} for k, v in self.options.items()]
return wire
def __str__(self) -> str:
suffix = "".join(f" {k}={v}" for k, v in self.options.items())
return f"{self.instance}/{self.model}{suffix}"
class Machine(BaseModel):
model_config = ConfigDict(frozen=True)
name: str
url: str
token_env: str
projects: tuple[str, ...] = ()
model: ModelSpec | None = None
@model_validator(mode="before")
@classmethod
def _fold_model(cls, data: Any) -> Any:
if isinstance(data, dict) and isinstance(data.get("model"), str):
data = {
**data,
"model": ModelSpec.parse(data["model"], data.pop("options", None)),
}
return data
@property
def token(self) -> str:
token = os.environ.get(self.token_env, "").strip()
if not token:
msg = f"machine {self.name!r}: env {self.token_env} is empty"
raise ValueError(msg)
return token
def allows(self, project: dict[str, Any]) -> bool:
candidates = (project.get("title", ""), project.get("workspaceRoot", ""))
return any(
fnmatch.fnmatchcase(c, pattern)
for pattern in self.projects
for c in candidates
)
def load_machines(path: Path) -> dict[str, Machine]:
with path.open("rb") as f:
raw = tomllib.load(f)
machines = {
name: Machine(name=name, **fields)
for name, fields in raw.get("machines", {}).items()
}
if not machines:
msg = f"{path}: no [machines.<name>] sections"
raise ValueError(msg)
for machine in machines.values():
_ = machine.token
return machines
class Settings(BaseSettings):
model_config = SettingsConfigDict(env_prefix="T3CODE_MCP_")
config: Path = Path("t3code.toml")
host: str = "0.0.0.0"
port: int = 8000
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"""MCP tools over one or more T3 Code servers.
`t3_wait` blocks on purpose: Claude Code has no MCP Tasks support and moves
any tool call still running after two minutes into a background task by
itself, so a plain long poll is the cheapest correct shape here.
"""
from __future__ import annotations
import asyncio
import time
from dataclasses import dataclass, field
from typing import TYPE_CHECKING, Annotated, Any
import httpx
from fastmcp import FastMCP
from fastmcp.exceptions import ToolError
from pydantic import Field
from starlette.responses import JSONResponse
from t3code_mcp import t3
from t3code_mcp.config import Machine, ModelSpec
from t3code_mcp.t3 import T3Client, T3Error
if TYPE_CHECKING:
from starlette.requests import Request
TITLE_MAX = 80
TEXT_MAX = 6000
TOOLS_MAX = 12
WAIT_MAX = 3600.0
PENDING_EVERY = 6
BUSY = frozenset({"running", "starting"})
STALLED_POLLS = 3
@dataclass
class Registry:
machines: dict[str, Machine]
transport: httpx.AsyncBaseTransport | None = None
clients: dict[str, T3Client] = field(default_factory=dict)
threads: dict[str, str] = field(default_factory=dict)
def machine(self, name: str) -> Machine:
try:
return self.machines[name]
except KeyError:
msg = f"unknown machine {name!r}; known: {', '.join(self.machines)}"
raise ToolError(msg) from None
def client(self, name: str) -> T3Client:
machine = self.machine(name)
if name not in self.clients:
self.clients[name] = T3Client(
machine.url, machine.token, transport=self.transport
)
return self.clients[name]
async def locate(self, thread_id: str) -> tuple[str, dict[str, Any]]:
names = (
[self.threads[thread_id]]
if thread_id in self.threads
else list(self.machines)
)
for name in names:
detail = await self.client(name).thread(thread_id, turn_limit=1)
if detail is not None:
self.threads[thread_id] = name
return name, detail
msg = f"thread {thread_id} not found on {', '.join(names)}"
raise ToolError(msg)
async def aclose(self) -> None:
for client in self.clients.values():
await client.aclose()
self.clients.clear()
def _title(prompt: str, title: str | None) -> str:
text = (title or prompt).strip().splitlines()[0].strip()
if len(text) > TITLE_MAX:
text = text[:TITLE_MAX].rsplit(" ", 1)[0] + ""
return text or "t3code-mcp"
def _state(thread: dict[str, Any]) -> str:
latest = thread.get("latestTurn")
if latest:
return latest["state"]
messages = thread.get("messages", [])
return "starting" if messages and messages[-1]["role"] == "user" else "idle"
def _find_project(
machine: Machine, projects: list[dict[str, Any]], key: str
) -> dict[str, Any]:
allowed = [p for p in projects if not p.get("deletedAt") and machine.allows(p)]
for project in allowed:
if key in (project["id"], project["title"], project["workspaceRoot"]):
return project
names = ", ".join(p["title"] for p in allowed) or "(none allowlisted)"
msg = f"project {key!r} is not available on {machine.name}; allowed: {names}"
raise ToolError(msg)
def _project_view(
project: dict[str, Any], threads: list[dict[str, Any]]
) -> dict[str, Any]:
own = [
t
for t in threads
if t["projectId"] == project["id"] and not t.get("archivedAt")
]
running = sum(
1 for t in own if (t.get("latestTurn") or {}).get("state") == "running"
)
default = project.get("defaultModelSelection")
return {
"id": project["id"],
"title": project["title"],
"path": project["workspaceRoot"],
"default_model": str(ModelSpec.from_selection(default)) if default else None,
"threads": len(own),
"running": running,
}
def _summary(
machine: str, detail: dict[str, Any], *, project: str | None = None
) -> dict[str, Any]:
thread = detail["thread"]
latest = thread.get("latestTurn") or {}
session = thread.get("session") or {}
messages = [
{"role": m["role"], "text": m["text"][-TEXT_MAX:], "streaming": m["streaming"]}
for m in thread.get("messages", [])
if m.get("text")
]
tools = [
{
"summary": a["summary"],
"detail": str((a.get("payload") or {}).get("detail", ""))[:200],
}
for a in thread.get("activities", [])
if a.get("kind") == "tool.completed"
][-TOOLS_MAX:]
files = [
{"path": f["path"], "kind": f["kind"], "+": f["additions"], "-": f["deletions"]}
for c in thread.get("checkpoints", [])[-1:]
for f in c.get("files", [])
]
context = next(
(
a["payload"]
for a in reversed(thread.get("activities", []))
if a.get("kind") == "context-window.updated"
),
None,
)
return {
"thread_id": thread["id"],
"machine": machine,
"project": project or thread["projectId"],
"title": thread["title"],
"model": str(ModelSpec.from_selection(thread["modelSelection"])),
"state": _state(thread),
"turn_id": latest.get("turnId"),
"session": session.get("status"),
"error": session.get("lastError"),
"messages": messages,
"tools": tools,
"files": files,
"context_tokens": (context or {}).get("usedTokens"),
}
def _pending(shell: dict[str, Any], thread_id: str) -> dict[str, bool] | None:
for thread in shell.get("threads", []):
if thread["id"] == thread_id:
flags = {
"approval": bool(thread.get("hasPendingApprovals")),
"user_input": bool(thread.get("hasPendingUserInput")),
"plan": bool(thread.get("hasActionableProposedPlan")),
}
return flags if any(flags.values()) else None
return None
def build_server(registry: Registry, *, poll: float = 5.0) -> FastMCP:
mcp = FastMCP(
"t3code",
instructions=(
"Coding threads on Бобёр's machines through T3 Code. Flow: t3_machines → "
"t3_projects(machine) → t3_dispatch → t3_wait / t3_thread. Prompts run "
"autonomously (full-access, no approvals): say what to change, what to "
"check, what not to touch, and that the answer should end with a report."
),
)
@mcp.custom_route("/healthz", methods=["GET"])
async def healthz(_: Request) -> JSONResponse:
return JSONResponse({"status": "ok", "machines": list(registry.machines)})
@mcp.tool
async def t3_machines() -> list[dict[str, Any]]:
"""Machines with a T3 Code server: reachable now or not, project allowlist."""
result = []
for name, machine in registry.machines.items():
entry: dict[str, Any] = {
"name": name,
"url": machine.url,
"projects": machine.projects,
}
try:
descriptor = await registry.client(name).descriptor()
except (httpx.HTTPError, T3Error) as exc:
entry.update(online=False, error=str(exc)[:200])
else:
entry.update(
online=True,
label=descriptor.get("label"),
version=descriptor.get("serverVersion"),
os=(descriptor.get("platform") or {}).get("os"),
)
result.append(entry)
return result
@mcp.tool
async def t3_projects(
machine: Annotated[str, Field(description="Machine name from t3_machines")],
) -> list[dict[str, Any]]:
"""Allowlisted projects on a machine: default model, thread counts."""
spec = registry.machine(machine)
shell = await _call(registry.client(machine).shell())
return [
_project_view(p, shell["threads"])
for p in shell["projects"]
if not p.get("deletedAt") and spec.allows(p)
]
@mcp.tool
async def t3_dispatch(
machine: Annotated[str, Field(description="Machine name from t3_machines")],
project: Annotated[
str, Field(description="Project title, path or id from t3_projects")
],
prompt: Annotated[
str,
Field(
description="The task for the coding agent, complete and self-contained"
),
],
title: Annotated[
str | None,
Field(description="Thread title; default - first line of the prompt"),
] = None,
model: Annotated[
str | None,
Field(
description=(
"`instance/model`, e.g. claudeAgent/claude-opus-5; "
"default from config or the project"
)
),
] = None,
thread_id: Annotated[
str | None,
Field(description="Continue this existing thread instead of creating one"),
] = None,
) -> dict[str, Any]:
"""Start a coding thread on a machine (or follow up in one); returns at once.
The thread runs in the background: t3_wait blocks until it finishes,
t3_thread peeks without blocking.
"""
text = prompt.strip()
if not text:
msg = "prompt is empty"
raise ToolError(msg)
spec = registry.machine(machine)
client = registry.client(machine)
shell = await _call(client.shell())
target = _find_project(spec, shell["projects"], project)
if model:
selection = ModelSpec.parse(
model, spec.model.options if spec.model else None
)
elif spec.model:
selection = spec.model
elif target.get("defaultModelSelection"):
selection = ModelSpec.from_selection(target["defaultModelSelection"])
else:
msg = f"no model: set `model` in config for {machine} or pass model="
raise ToolError(msg)
heading = _title(text, title)
if thread_id:
existing = next((t for t in shell["threads"] if t["id"] == thread_id), None)
if existing is None or existing["projectId"] != target["id"]:
msg = f"thread {thread_id} is not in {target['title']} on {machine}"
raise ToolError(msg)
if (existing.get("latestTurn") or {}).get("state") == "running":
msg = f"thread {thread_id} is running; t3_wait or t3_interrupt first"
raise ToolError(msg)
tid = thread_id
await _call(
client.dispatch(t3.turn_start(tid, text, selection.selection()))
)
else:
tid = t3.new_id()
await _call(
client.dispatch(
t3.thread_create(tid, target["id"], heading, selection.selection())
)
)
await _call(client.dispatch(t3.turn_start(tid, text, title_seed=heading)))
registry.threads[tid] = machine
return {
"thread_id": tid,
"machine": machine,
"project": target["title"],
"path": target["workspaceRoot"],
"title": heading,
"model": str(selection),
"state": "running",
}
@mcp.tool
async def t3_thread(
thread_id: Annotated[str, Field(description="thread_id from t3_dispatch")],
turns: Annotated[
int, Field(description="How many recent user turns to include", ge=1, le=20)
] = 2,
) -> dict[str, Any]:
"""State of a thread without waiting.
Turn state, last messages, tools run, files changed, pending questions.
"""
machine, _ = await registry.locate(thread_id)
client = registry.client(machine)
detail = await _call(client.thread(thread_id, turn_limit=turns))
shell = await _call(client.shell())
if detail is None:
msg = f"thread {thread_id} vanished from {machine}"
raise ToolError(msg)
summary = _summary(machine, detail, project=_project_title(shell, detail))
summary["pending"] = _pending(shell, thread_id)
return summary
@mcp.tool
async def t3_wait(
thread_id: Annotated[str, Field(description="thread_id from t3_dispatch")],
timeout: Annotated[ # noqa: ASYNC109 - the tool's contract, not asyncio's
float,
Field(
description="Seconds to wait before giving the current state back",
ge=5,
le=WAIT_MAX,
),
] = 900,
) -> dict[str, Any]:
"""Block until the turn finishes, asks a question, or timeout runs out.
Ends on completed / interrupted / error, on a pending approval or
user-input request, or after `timeout` seconds; returns the t3_thread view.
"""
machine, detail = await registry.locate(thread_id)
client = registry.client(machine)
started = time.monotonic()
polls = 0
pending: dict[str, bool] | None = None
project: str | None = None
stalled = 0
while True:
thread = detail["thread"]
state = _state(thread)
session = thread.get("session") or {}
status = session.get("status")
if polls % PENDING_EVERY == 0:
shell = await _call(client.shell())
pending = _pending(shell, thread_id)
project = _project_title(shell, detail)
failed = status == "error" or bool(session.get("lastError"))
stalled = stalled + 1 if state == "starting" and status == "stopped" else 0
busy = (state in BUSY or status == "starting") and stalled < STALLED_POLLS
done = not busy or failed or pending is not None
timed_out = time.monotonic() - started >= timeout
if done or timed_out:
summary = _summary(machine, detail, project=project)
summary["pending"] = pending
summary["timed_out"] = timed_out and not done
summary["waited"] = round(time.monotonic() - started, 1)
return summary
await asyncio.sleep(poll)
polls += 1
refreshed = await _call(client.thread(thread_id, turn_limit=1))
if refreshed is None:
msg = f"thread {thread_id} vanished from {machine}"
raise ToolError(msg)
detail = refreshed
@mcp.tool
async def t3_interrupt(
thread_id: Annotated[str, Field(description="thread_id from t3_dispatch")],
) -> dict[str, Any]:
"""Interrupt the running turn; continue later via t3_dispatch(thread_id=...)."""
machine, detail = await registry.locate(thread_id)
latest = detail["thread"].get("latestTurn") or {}
if latest.get("state") != "running":
return {
"thread_id": thread_id,
"machine": machine,
"state": latest.get("state", "idle"),
}
await _call(
registry.client(machine).dispatch(
t3.turn_interrupt(thread_id, latest.get("turnId"))
)
)
return {"thread_id": thread_id, "machine": machine, "state": "interrupting"}
return mcp
def _project_title(shell: dict[str, Any], detail: dict[str, Any]) -> str | None:
project_id = detail["thread"]["projectId"]
return next((p["title"] for p in shell["projects"] if p["id"] == project_id), None)
async def _call(awaitable: Any) -> Any:
try:
return await awaitable
except T3Error as exc:
raise ToolError(str(exc)) from exc
except httpx.HTTPError as exc:
msg = f"T3 unreachable: {exc}"
raise ToolError(msg) from exc
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"""HTTP client for one T3 Code server (`packages/contracts/src/environmentHttp.ts`).
Four routes are used: the unauthenticated descriptor, the shell read-model
(projects + threads without bodies), one thread with a turn window, and
`dispatch` with a `ClientOrchestrationCommand`. The WebSocket RPC
(`terminal.*` and friends) is deliberately not wrapped.
"""
from __future__ import annotations
import uuid
from datetime import UTC, datetime
from typing import Any
import httpx
DESCRIPTOR = "/.well-known/t3/environment"
SHELL = "/api/orchestration/shell"
THREADS = "/api/orchestration/threads"
DISPATCH = "/api/orchestration/dispatch"
RUNTIME_MODE = "full-access"
INTERACTION_MODE = "default"
PROBE_TIMEOUT = 5.0
class T3Error(Exception):
def __init__(self, status: int, body: Any) -> None:
self.status = status
self.body = body
detail = (
f"{body.get('code')}: {body.get('reason') or body.get('message')}"
if isinstance(body, dict)
else str(body)[:300]
)
super().__init__(f"T3 responded {status} - {detail}")
def now_iso() -> str:
return datetime.now(UTC).isoformat(timespec="milliseconds").replace("+00:00", "Z")
def new_id() -> str:
return str(uuid.uuid4())
def thread_create(
thread_id: str, project_id: str, title: str, selection: dict[str, Any]
) -> dict[str, Any]:
return {
"type": "thread.create",
"commandId": new_id(),
"threadId": thread_id,
"projectId": project_id,
"title": title,
"modelSelection": selection,
"runtimeMode": RUNTIME_MODE,
"interactionMode": INTERACTION_MODE,
"branch": None,
"worktreePath": None,
"createdAt": now_iso(),
}
def turn_start(
thread_id: str,
text: str,
selection: dict[str, Any] | None = None,
title_seed: str | None = None,
) -> dict[str, Any]:
command: dict[str, Any] = {
"type": "thread.turn.start",
"commandId": new_id(),
"threadId": thread_id,
"message": {
"messageId": new_id(),
"role": "user",
"text": text,
"attachments": [],
},
"runtimeMode": RUNTIME_MODE,
"interactionMode": INTERACTION_MODE,
"createdAt": now_iso(),
}
if selection is not None:
command["modelSelection"] = selection
if title_seed:
command["titleSeed"] = title_seed
return command
def turn_interrupt(thread_id: str, turn_id: str | None = None) -> dict[str, Any]:
command: dict[str, Any] = {
"type": "thread.turn.interrupt",
"commandId": new_id(),
"threadId": thread_id,
"createdAt": now_iso(),
}
if turn_id:
command["turnId"] = turn_id
return command
class T3Client:
def __init__(
self,
url: str,
token: str,
*,
transport: httpx.AsyncBaseTransport | None = None,
timeout: float = 30.0,
) -> None:
self.url = url.rstrip("/")
self._http = httpx.AsyncClient(
base_url=self.url,
headers={"Authorization": f"Bearer {token}"},
timeout=timeout,
transport=transport,
)
async def aclose(self) -> None:
await self._http.aclose()
async def descriptor(self) -> dict[str, Any]:
response = await self._http.get(
DESCRIPTOR, headers={"Authorization": ""}, timeout=PROBE_TIMEOUT
)
return self._json(response)
async def shell(self) -> dict[str, Any]:
return self._json(await self._http.get(SHELL))
async def thread(
self, thread_id: str, turn_limit: int | None = None
) -> dict[str, Any] | None:
params = {"turnLimit": turn_limit} if turn_limit else None
response = await self._http.get(f"{THREADS}/{thread_id}", params=params)
if response.status_code == httpx.codes.NOT_FOUND:
return None
return self._json(response)
async def dispatch(self, command: dict[str, Any]) -> dict[str, Any]:
return self._json(await self._http.post(DISPATCH, json=command))
@staticmethod
def _json(response: httpx.Response) -> dict[str, Any]:
try:
body: Any = response.json()
except ValueError:
body = response.text
if response.is_error or not isinstance(body, dict):
raise T3Error(response.status_code, body)
return body