AJ Avezzano
dd7557ea62
- Auto-discovers Claude Code (~/.claude/settings.json) alongside Claude Desktop - Generated icons/app.icns (macOS) and icons/app.ico (Windows) from rounded PNGs - bcc.spec: PyInstaller spec for all platforms (.app on macOS, onefile on Windows/Linux) - .github/workflows/release.yml: builds and publishes GitHub Release on version tags - scripts/build_icons.py: regenerates icon files from source PNGs - requirements-dev.txt: adds pyinstaller and pillow for building - CLAUDE.md: initial repo guidance for Claude Code Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
548 lines
21 KiB
Python
548 lines
21 KiB
Python
"""
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mcp_core.py -- Pure logic for the Claude MCP config manager.
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No GUI imports live in here on purpose: every function below is unit-testable
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and could just as easily back a CLI. The GUI (mcp_manager.py) is a thin shell
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over these functions.
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The cardinal rule of this module: when writing a config back to disk we ONLY
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ever touch the `mcpServers` block (and our own `_disabledMcpServers` parking
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key). Every other top-level key in the user's config is preserved verbatim and
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in its original position.
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"""
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from __future__ import annotations
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import functools
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import glob
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import json
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import os
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import shutil
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import sys
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import tempfile
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import time
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from dataclasses import dataclass, field
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from pathlib import Path
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from urllib.parse import urlparse
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CONFIG_FILENAME = "claude_desktop_config.json"
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# Disabled servers are parked under this non-standard key. Claude Desktop only
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# reads `mcpServers`, so anything here is ignored by the app but kept on disk so
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# we can toggle it back on without losing the definition.
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DISABLED_KEY = "_disabledMcpServers"
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BACKUP_DIRNAME = ".bcc_backups"
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MAX_BACKUPS = 15
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# Fields the editor knows how to render. Anything else on a server object is
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# considered "extra" and is preserved untouched on save.
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KNOWN_FIELDS = {"command", "args", "env", "url", "type", "headers"}
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# --------------------------------------------------------------------------- #
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# Data model
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# --------------------------------------------------------------------------- #
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@dataclass
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class Profile:
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"""A discovered (or manually added) Claude install location."""
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label: str
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path: Path
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config_exists: bool
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def __post_init__(self):
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self.path = Path(self.path)
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@dataclass
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class ServerEntry:
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name: str
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data: dict
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enabled: bool = True
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@property
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def kind(self) -> str:
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return "remote" if "url" in self.data and "command" not in self.data else "stdio"
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# --------------------------------------------------------------------------- #
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# Discovery
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# --------------------------------------------------------------------------- #
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def app_support_base() -> Path:
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"""The per-platform directory that holds the `Claude*` data folders."""
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if sys.platform == "darwin":
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return Path.home() / "Library" / "Application Support"
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if os.name == "nt":
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return Path(os.environ.get("APPDATA", Path.home() / "AppData" / "Roaming"))
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return Path(os.environ.get("XDG_CONFIG_HOME", Path.home() / ".config"))
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def discover_profiles() -> list[Profile]:
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"""
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Find every `Claude*` data directory in the platform's app-support base
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(Claude Desktop installs), then also check for a Claude Code global config.
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Claude Desktop: scans the platform app-support folder for any `Claude*`
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directory (catches `Claude`, `Claude-Work`, etc.).
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Claude Code: always at ~/.claude/settings.json on every platform.
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"""
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base = app_support_base()
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out: list[Profile] = []
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if base.is_dir():
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seen = set()
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for d in sorted(base.glob("Claude*")):
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if d.is_dir() and d.name not in seen:
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seen.add(d.name)
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cfg = d / CONFIG_FILENAME
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out.append(Profile(label=d.name, path=cfg, config_exists=cfg.is_file()))
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# Claude Code global settings (~/.claude/settings.json) — same mcpServers format,
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# cross-platform (the ~/.claude/ directory is always in the same place).
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cc_cfg = Path.home() / ".claude" / "settings.json"
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out.append(Profile(label="Claude Code", path=cc_cfg, config_exists=cc_cfg.is_file()))
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return out
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def profile_from_path(path: str | os.PathLike) -> Profile:
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"""Build a Profile from a user-supplied config path (the 'override' case)."""
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p = Path(path)
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# Prefer the parent folder name as the label (e.g. .../Claude-Work/...json -> Claude-Work)
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label = p.parent.name or p.name
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return Profile(label=label, path=p, config_exists=p.is_file())
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# --------------------------------------------------------------------------- #
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# Load / extract / apply
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# --------------------------------------------------------------------------- #
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def load_config(path: str | os.PathLike) -> dict:
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"""Read the full config dict. Missing/empty file -> {}. Bad JSON -> raises."""
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p = Path(path)
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if not p.is_file():
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return {}
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text = p.read_text(encoding="utf-8")
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if not text.strip():
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return {}
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obj = json.loads(text) # JSONDecodeError bubbles up for the GUI to display
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if not isinstance(obj, dict):
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raise ValueError("Top-level JSON in the config file is not an object.")
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return obj
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def extract_servers(cfg: dict) -> list[ServerEntry]:
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"""Pull enabled (`mcpServers`) and disabled (`_disabledMcpServers`) servers."""
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out: list[ServerEntry] = []
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for name, data in (cfg.get("mcpServers") or {}).items():
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out.append(ServerEntry(name=name, data=dict(data), enabled=True))
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for name, data in (cfg.get(DISABLED_KEY) or {}).items():
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out.append(ServerEntry(name=name, data=dict(data), enabled=False))
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return out
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def apply_servers(cfg: dict, servers: list[ServerEntry]) -> dict:
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"""
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Write the server list back into `cfg` in place, preserving every other key
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and the position of `mcpServers`. Returns the same dict for convenience.
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"""
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enabled = {s.name: s.data for s in servers if s.enabled}
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disabled = {s.name: s.data for s in servers if not s.enabled}
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cfg["mcpServers"] = enabled # replaces value if key existed; appends otherwise
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if disabled:
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cfg[DISABLED_KEY] = disabled
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else:
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cfg.pop(DISABLED_KEY, None)
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return cfg
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# --------------------------------------------------------------------------- #
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# Write (atomic, with rotating backups)
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# --------------------------------------------------------------------------- #
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def _make_backup(path: Path) -> Path:
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bdir = path.parent / BACKUP_DIRNAME
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bdir.mkdir(exist_ok=True)
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stamp = time.strftime("%Y%m%d-%H%M%S")
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dest = bdir / f"{path.stem}.{stamp}.json"
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# Avoid clobbering a same-second backup
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n = 1
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while dest.exists():
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dest = bdir / f"{path.stem}.{stamp}.{n}.json"
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n += 1
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shutil.copy2(path, dest)
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# Prune oldest beyond MAX_BACKUPS
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backups = sorted(bdir.glob(f"{path.stem}.*.json"))
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for old in backups[:-MAX_BACKUPS]:
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try:
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old.unlink()
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except OSError:
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pass
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return dest
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def write_config(path: str | os.PathLike, cfg: dict) -> Path | None:
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"""
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Atomically write `cfg` to `path` (2-space pretty JSON). Backs up any existing
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file first. Returns the backup path (or None if there was nothing to back up).
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"""
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p = Path(path)
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p.parent.mkdir(parents=True, exist_ok=True)
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backup = _make_backup(p) if p.is_file() else None
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payload = json.dumps(cfg, indent=2, ensure_ascii=False) + "\n"
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fd, tmp = tempfile.mkstemp(dir=str(p.parent), prefix=".tmp_mcp_", suffix=".json")
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try:
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with os.fdopen(fd, "w", encoding="utf-8") as f:
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f.write(payload)
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os.replace(tmp, p) # atomic on the same filesystem
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finally:
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if os.path.exists(tmp):
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os.remove(tmp)
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return backup
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# --------------------------------------------------------------------------- #
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# Paste / import parsing
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# --------------------------------------------------------------------------- #
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def looks_like_server(data) -> bool:
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return isinstance(data, dict) and ("command" in data or "url" in data)
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def suggest_name(data: dict) -> str:
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"""Derive a friendly default name from a server definition."""
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if "url" in data and "command" not in data:
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host = (urlparse(data["url"]).hostname or "remote")
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return host.split(".")[0] or "remote"
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for a in data.get("args", []) or []:
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if isinstance(a, str) and ("/" in a or a.startswith("@")):
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base = a.rstrip("/").split("/")[-1]
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base = base.replace("server-", "").replace("mcp-server-", "").replace("mcp-", "")
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if base:
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return base
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cmd = data.get("command", "server")
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return Path(str(cmd)).stem or "server"
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def parse_pasted_json(text: str) -> dict[str, dict]:
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"""
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Accept any of the shapes MCP docs hand out and return {name: server_dict}:
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1. Full config: {"mcpServers": {"name": {...}}}
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2. Inner block only: {"name": {"command": ...}}
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3. A bare server obj: {"command": ..., "args": [...]} (name is suggested)
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Raises ValueError with a human message on anything unrecognizable.
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"""
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text = (text or "").strip()
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if not text:
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raise ValueError("Nothing to parse.")
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obj = json.loads(text)
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if not isinstance(obj, dict):
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raise ValueError("Top-level JSON must be an object ({ ... }).")
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if isinstance(obj.get("mcpServers"), dict):
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servers = obj["mcpServers"]
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elif looks_like_server(obj):
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servers = {suggest_name(obj): obj}
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elif obj and all(isinstance(v, dict) for v in obj.values()):
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servers = obj
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else:
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raise ValueError("Couldn't find any MCP server definitions in that JSON.")
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clean: dict[str, dict] = {}
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for name, data in servers.items():
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if not looks_like_server(data):
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raise ValueError(
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f"'{name}' doesn't look like an MCP server "
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f"(it needs a 'command' or a 'url')."
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)
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clean[str(name)] = data
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return clean
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# --------------------------------------------------------------------------- #
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# Validation
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# --------------------------------------------------------------------------- #
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def validate_servers(servers: list[ServerEntry]) -> list[str]:
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"""Return a list of human-readable problems. Empty list == all good."""
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problems: list[str] = []
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seen: dict[str, int] = {}
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for s in servers:
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nm = s.name.strip()
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if not nm:
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problems.append("A server has an empty name.")
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seen[nm] = seen.get(nm, 0) + 1
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if s.kind == "stdio":
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if not str(s.data.get("command", "")).strip():
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problems.append(f"'{nm or '(unnamed)'}' is a local server but has no command.")
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else:
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url = str(s.data.get("url", "")).strip()
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if not url:
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problems.append(f"'{nm or '(unnamed)'}' is a remote server but has no URL.")
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elif not (url.startswith("http://") or url.startswith("https://")):
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problems.append(f"'{nm}' has a URL that isn't http(s).")
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for nm, count in seen.items():
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if nm and count > 1:
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problems.append(f"Duplicate server name: '{nm}' ({count}x).")
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return problems
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# --------------------------------------------------------------------------- #
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# Dependency / PATH checking
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# --------------------------------------------------------------------------- #
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@functools.lru_cache(maxsize=1)
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def augmented_path() -> str:
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"""
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PATH + the usual runtime install locations. GUI apps (especially bundled
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.app launches) often don't inherit the shell PATH, so npx/uvx can appear
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'missing' when they're actually fine. This widens the net.
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Memoized for the session (PATH rarely changes mid-run). Call
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refresh_path_cache() after the user installs something to re-scan.
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"""
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parts = os.environ.get("PATH", "").split(os.pathsep)
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home = Path.home()
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extra = [
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"/usr/local/bin", "/opt/homebrew/bin", "/usr/bin", "/bin",
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str(home / ".local" / "bin"),
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str(home / ".cargo" / "bin"),
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str(home / ".deno" / "bin"),
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str(home / ".bun" / "bin"),
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str(home / ".volta" / "bin"),
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]
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extra += glob.glob(str(home / ".nvm" / "versions" / "node" / "*" / "bin"))
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extra += glob.glob(str(home / ".local" / "share" / "fnm" / "node-versions" / "*" / "installation" / "bin"))
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if os.name == "nt":
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appdata = os.environ.get("APPDATA", "")
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if appdata:
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extra.append(str(Path(appdata) / "npm"))
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seen, ordered = set(), []
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for p in parts + extra:
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if p and p not in seen and Path(p).is_dir():
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seen.add(p)
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ordered.append(p)
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return os.pathsep.join(ordered)
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def refresh_path_cache():
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"""Forget the memoized PATH so the next check re-scans (e.g. after an install)."""
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augmented_path.cache_clear()
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# Tailored install advice keyed by the runner's basename.
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RUNNER_HINTS = {
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"npx": "Node.js / npx not found. Install Node from nodejs.org or `brew install node`. "
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"With nvm, the binary lives at ~/.nvm/versions/node/<version>/bin.",
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"node": "Node.js not found. Install from nodejs.org or `brew install node`.",
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"uvx": "uv not found. Install with `curl -LsSf https://astral.sh/uv/install.sh | sh` "
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"(or `brew install uv`). uvx ships inside uv.",
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"uv": "uv not found. Install with `curl -LsSf https://astral.sh/uv/install.sh | sh` "
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"(or `brew install uv`).",
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"python": "Python not found on this PATH.",
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"python3": "Python 3 not found on this PATH.",
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"docker": "Docker not found. Install Docker Desktop and make sure it's running.",
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"bun": "Bun not found. Install with `curl -fsSL https://bun.sh/install | bash`.",
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"deno": "Deno not found. Install with `curl -fsSL https://deno.land/install.sh | sh`.",
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}
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def runner_hint(cmd: str) -> str:
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base = Path(cmd).name.lower()
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if base.endswith(".exe"):
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base = base[:-4]
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if base in RUNNER_HINTS:
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return RUNNER_HINTS[base]
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if ("/" in cmd) or ("\\" in cmd):
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return (f"'{cmd}' looks like a file path, but it doesn't exist or isn't executable. "
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f"Check the path and that it's marked executable (chmod +x).")
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return f"'{cmd}' was not found on PATH. Install it, or put the full path to the executable in 'command'."
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SHELL_WRAPPERS = {"cmd", "cmd.exe", "sh", "bash", "zsh", "powershell", "powershell.exe", "pwsh"}
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def _commands_to_check(data: dict) -> list[str]:
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cmd = data.get("command")
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if not cmd:
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return []
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cmds = [str(cmd)]
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base = Path(str(cmd)).name.lower()
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if base in SHELL_WRAPPERS:
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for a in data.get("args", []) or []:
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if isinstance(a, str) and not a.startswith(("/", "-")) and " " not in a:
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cmds.append(a)
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break
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return cmds
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def check_dependency(data: dict, path: str | None = None) -> dict:
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"""
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Decide whether a server's command can actually be found, and gather enough
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context to troubleshoot when it can't.
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status is one of:
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'ok' - resolved on the normal (inherited) PATH; will work anywhere.
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'warn' - resolved, but ONLY via an augmented location. Works in a
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terminal launch; a bundled .app launch of Claude may not see it.
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'missing' - not found anywhere.
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'remote' - a url-based server (no local command to check).
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'unknown' - no command set.
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Returns: {status, label, resolved, in_base, searched_path, hints, commands, detail}
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"""
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if "url" in data and "command" not in data:
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return {"status": "remote", "label": "remote endpoint", "detail": data.get("url", ""),
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"resolved": {}, "in_base": {}, "searched_path": "", "hints": [], "commands": []}
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cmds = _commands_to_check(data)
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if not cmds:
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return {"status": "unknown", "label": "no command set", "detail": "",
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"resolved": {}, "in_base": {}, "searched_path": "",
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"hints": ["This server has no 'command' to run."], "commands": []}
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aug = path or augmented_path()
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resolved: dict[str, str | None] = {}
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in_base: dict[str, bool] = {}
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for c in cmds:
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if (os.sep in c) or ("/" in c): # explicit path, independent of PATH
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cp = Path(c)
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ok = cp.exists() and os.access(cp, os.X_OK)
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resolved[c] = str(cp) if ok else None
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in_base[c] = ok
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else:
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resolved[c] = shutil.which(c, path=aug)
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in_base[c] = bool(shutil.which(c)) # raw inherited PATH only
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missing = [c for c, r in resolved.items() if not r]
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hints: list[str] = []
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if missing:
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for c in missing:
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hints.append(runner_hint(c))
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status = "missing"
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label = "missing: " + ", ".join(missing)
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else:
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nonbase = [c for c in resolved if not in_base[c]]
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if nonbase:
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status = "warn"
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label = "found, but only on a non-standard PATH"
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for c in nonbase:
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hints.append(
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f"'{c}' was found at {resolved[c]}, but only via a location this app added on "
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f"top of the inherited PATH. If you launch Claude Desktop as an app (not from a "
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f"terminal), it may not see this. Putting the full path in 'command' is the reliable fix."
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)
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else:
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status = "ok"
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label = "found: " + ", ".join(Path(p).name for p in resolved.values())
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return {"status": status, "label": label, "resolved": resolved, "in_base": in_base,
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"searched_path": aug, "hints": hints, "commands": cmds, "detail": ""}
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def diagnostics_text(name: str, data: dict) -> str:
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"""A copy-pasteable plain-text troubleshooting report for one server."""
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res = check_dependency(data)
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L: list[str] = []
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if res["status"] == "remote":
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L.append(f"Server: {name or '(unnamed)'} [remote]")
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L.append(f"URL: {data.get('url', '')}")
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if data.get("type"):
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L.append(f"Transport: {data['type']}")
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if data.get("headers"):
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L.append("Headers: " + ", ".join(data["headers"].keys()))
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L.append("Status: REMOTE (network reachability is not checked)")
|
|
return "\n".join(L)
|
|
|
|
L.append(f"Server: {name or '(unnamed)'} [local / stdio]")
|
|
L.append(f"Command: {data.get('command', '')}")
|
|
if data.get("args"):
|
|
L.append("Args: " + " ".join(str(a) for a in data["args"]))
|
|
if data.get("env"):
|
|
L.append("Env keys: " + ", ".join(data["env"].keys()))
|
|
L.append(f"Status: {res['status'].upper()}")
|
|
L.append("")
|
|
L.append("Command resolution:")
|
|
for c, r in res["resolved"].items():
|
|
if r:
|
|
tag = "" if res["in_base"].get(c) else " <-- non-standard PATH; app may not see it"
|
|
L.append(f" {c} -> {r}{tag}")
|
|
else:
|
|
L.append(f" {c} -> NOT FOUND")
|
|
if res["hints"]:
|
|
L.append("")
|
|
L.append("Hints:")
|
|
for h in res["hints"]:
|
|
L.append(f" - {h}")
|
|
|
|
base_dirs = [p for p in os.environ.get("PATH", "").split(os.pathsep) if p]
|
|
aug_dirs = res["searched_path"].split(os.pathsep) if res["searched_path"] else []
|
|
extra = [d for d in aug_dirs if d not in base_dirs]
|
|
L.append("")
|
|
L.append(f"PATH searched ({len(aug_dirs)} dirs):")
|
|
for d in aug_dirs:
|
|
L.append((" + " if d in extra else " ") + d)
|
|
if extra:
|
|
L.append("")
|
|
L.append("(+ = added by this app on top of the PATH it inherited. Claude Desktop, "
|
|
"launched separately, may NOT have these on its PATH.)")
|
|
return "\n".join(L)
|
|
|
|
|
|
def test_remote(url: str, timeout: float = 5.0) -> tuple[bool, str]:
|
|
"""
|
|
Reachability check for a url-based MCP server. ANY HTTP response (even 4xx/5xx)
|
|
counts as reachable; only connection/DNS/timeout failures count as unreachable.
|
|
Returns (ok, detail). Network call — run this off the UI thread.
|
|
"""
|
|
import socket
|
|
import urllib.error
|
|
import urllib.request
|
|
|
|
url = (url or "").strip()
|
|
if not (url.startswith("http://") or url.startswith("https://")):
|
|
return False, "not an http(s) URL"
|
|
req = urllib.request.Request(
|
|
url, method="GET",
|
|
headers={"Accept": "text/event-stream, application/json, */*",
|
|
"User-Agent": "BetterClaudeConfig/1.0"},
|
|
)
|
|
try:
|
|
with urllib.request.urlopen(req, timeout=timeout) as r:
|
|
return True, f"HTTP {r.status}"
|
|
except urllib.error.HTTPError as e:
|
|
return True, f"HTTP {e.code} (reachable)"
|
|
except urllib.error.URLError as e:
|
|
reason = getattr(e, "reason", e)
|
|
if isinstance(reason, socket.timeout):
|
|
return False, "timed out"
|
|
return False, str(reason)
|
|
except socket.timeout:
|
|
return False, "timed out"
|
|
except Exception as e: # noqa: BLE001 - surface anything else as a clean message
|
|
return False, str(e)
|
|
|
|
|
|
def pin_command_path(data: dict, path: str | None = None) -> tuple[dict, str | None]:
|
|
"""
|
|
Fix a 'PATH-risk' (warn) server by rewriting the bare runner name to the
|
|
absolute path it resolved to, so any process (incl. a bundled Claude.app)
|
|
can find it. Returns (new_data, note). note is None if nothing was pinned.
|
|
"""
|
|
res = check_dependency(data, path)
|
|
if res["status"] != "warn":
|
|
return data, None
|
|
out = dict(data)
|
|
for c, resolved in res["resolved"].items():
|
|
if resolved and not res["in_base"].get(c, True) and ("/" not in c and "\\" not in c):
|
|
if str(out.get("command", "")) == c:
|
|
out["command"] = resolved
|
|
return out, f"command → {resolved}"
|
|
args = list(out.get("args", []) or [])
|
|
for i, a in enumerate(args):
|
|
if a == c:
|
|
args[i] = resolved
|
|
out["args"] = args
|
|
return out, f"'{c}' → {resolved}"
|
|
return data, None
|