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A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.
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Stop paying 30,000 tokens per query. This bridge implements Anthropic's discovery pattern with rootless security—reducing MCP context from 30K to 200 tokens while proxying any stdio server.
An MCP server that executes Python code in isolated rootless containers with optional MCP server proxying. Implementation of Anthropic's and Cloudflare's ideas for reducing MCP tool definitions context bloat.
This bridge implements the "Code Execution with MCP" pattern, a convergence of ideas from industry leaders:
Instead of exposing hundreds of individual tools to the LLM (which consumes massive context and confuses the model), this bridge exposes one tool: run_python. The LLM writes Python code to discover, call, and compose other tools.
While there are JavaScript-based alternatives (like universal-tool-calling-protocol/code-mode), this project is built for Data Science and Security:
Choose this if: You want your agent to analyze data, generate charts, use scientific libraries, or if you require strict container-based isolation for running untrusted code.
Connect Claude to 11 MCP servers with ~100 tools = 30,000 tokens of tool schemas loaded into every prompt. That's $0.09 per query before you ask a single question. Scale to 50 servers and your context window breaks.
Traditional MCP (Context-Bound)
┌─────────────────────────────┐
│ LLM Context (30K tokens) │
│ - serverA.tool1: {...} │
│ - serverA.tool2: {...} │
│ - serverB.tool1: {...} │
│ - … (dozens more) │
└─────────────────────────────┘
↓
LLM picks tool
↓
Tool executes
This Bridge (Discovery-First)
┌─────────────────────────────┐
│ LLM Context (≈200 tokens) │
│ “Use discovered_servers(), │
│ query_tool_docs(), │
│ search_tool_docs()” │
└─────────────────────────────┘
↓
LLM discovers servers
↓
LLM hydrates schemas
↓
LLM writes Python
↓
Bridge proxies execution
Result: constant overhead. Whether you manage 10 or 1000 tools, the system prompt stays right-sized and schemas flow only when requested.
Speakeasy's Dynamic Toolsets use a 3-step flow: search_tools → describe_tools → execute_tool. While this saves tokens, it forces the agent into a "chatty" loop:
create_issue"create_issue"This Bridge (Code-First) collapses that loop:
mcp_github, search for 'issues', and create one if missing."The agent writes a single Python script that performs discovery, logic, and execution in one round-trip. It's faster, cheaper (fewer intermediate LLM calls), and handles complex logic (loops, retries) that a simple "execute" tool cannot.
OneMCP provides a "Handbook" chat interface where you ask questions and it plans execution. This is great for simple queries but turns the execution into a black box.
This Bridge gives the agent raw, sandboxed control. The agent isn't asking a black box to "do it"; the agent is the programmer, writing the exact code to interact with the API. This allows for precise edge-case handling and complex data processing that a natural language planner might miss.
Two-stage discovery – discovered_servers() reveals what exists; query_tool_docs(name) loads only the schemas you need.
Fuzzy search across servers – let the model find tools without memorising catalog names:
from mcp import runtime
matches = await runtime.search_tool_docs("calendar events", limit=5)
for hit in matches:
print(hit["server"], hit["tool"], hit.get("description", ""))
Zero-copy proxying – every tool call stays within the sandbox, mirrored over stdio with strict timeouts.
Rootless by default – Podman/Docker containers run with --cap-drop=ALL, read-only root, no-new-privileges, and explicit memory/PID caps.
Compact + TOON output – minimal plain-text responses for most runs, with deterministic TOON blocks available via MCP_BRIDGE_OUTPUT_MODE=toon.
This server aligns with the philosophy that you might not need MCP at all for every little tool. Instead of building rigid MCP servers for simple tasks, you can use this server to give your agent raw, sandboxed access to Bash and Python.
run_python in Claude's contextMultiple access patterns:
mcp_servers["server"] # Dynamic lookup
mcp_server_name # Attribute access
from mcp.servers.server import * # Module import
Top-level await - Modern Python patterns
Type-safe - Proper signatures and docs
Compact responses - Plain-text output by default with optional TOON blocks when requested
structuredContent payload containing only non-empty fields. stdout/stderr lines stay intact, so prompts remain lean without sacrificing content.MCP_BRIDGE_OUTPUT_MODE=toon to emit Token-Oriented Object Notation blocks. We still drop empty fields and mirror the same structure in structuredContent; TOON is handy when you want deterministic tokenisation for downstream prompts.# Save context for future sessions
save_memory("project_context", {
"goal": "Build REST API",
"current_task": "Implement auth",
"decisions": ["Use JWT tokens", "PostgreSQL backend"]
})
# Retrieve in a later session
context = load_memory("project_context")
print(f"Working on: {context['current_task']}")
# Update incrementally
update_memory("project_context", lambda ctx: {
**ctx,
"decisions": ctx["decisions"] + ["Add rate limiting"]
})
# List all saved memories
for mem in list_memories():
print(f"{mem['key']}: created {mem['created_at']}")
# Check existence before loading
if memory_exists("user_preferences"):
prefs = load_memory("user_preferences")
Memory files are stored in /projects/memory/ inside the container, which maps to ~/MCPs/user_tools/memory/ on the host. This persists across sessions and container restarts.
SANDBOX_HELPERS_SUMMARY in the tool schema only advertises the discovery helpers (discovered_servers(), list_servers(), query_tool_docs(), search_tool_docs(), etc.). It never includes individual server or tool documentation.discovered_servers() (or list_servers_sync() for the cached list) to enumerate MCP servers, then query_tool_docs(server) / query_tool_docs_sync(server) or search_tool_docs("keyword") / search_tool_docs_sync("keyword") to fetch the relevant subset of documentation.mcp_<alias> proxies or mcp.runtime helpers to invoke tools.Need a short description without probing the helpers? Call runtime.capability_summary() to print a one-paragraph overview suitable for replying to questions such as “what can the code-execution MCP do?”
python3 --version (Python 3.11+ required)brew install podman or brew install --cask dockersudo apt-get install -y podman or curl -fsSL https://get.docker.com | shcurl -LsSf https://astral.sh/uv/install.sh | sh
podman pull python:3.13-slim
# or
docker pull python:3.13-slim
Note on Pydantic compatibility:
pydantic >= 2.12.0). Some older Pydantic versions or environments that install a separate typing package from PyPI may raise errors such as:TypeError: _eval_type() got an unexpected keyword argument 'prefer_fwd_module'
If you see this error, run:
pip install -U pydantic
pip uninstall typing # if present; the stdlib's typing should be used
And re-run the project setup (e.g. remove .venv/ and uv sync).
Use uv to sync the project environment:
uv sync
uvx --from git+https://github.com/elusznik/mcp-server-code-execution-mode mcp-server-code-execution-mode run
If you prefer to run from a local checkout, the equivalent command is:
uv run python mcp_server_code_execution_mode.py
Add the following server configuration to your agent's MCP settings file (e.g., mcp_config.json, claude_desktop_config.json, etc.):
{
"mcpServers": {
"mcp-server-code-execution-mode": {
"command": "uvx",
"args": [
"--from",
"git+https://github.com/elusznik/mcp-server-code-execution-mode",
"mcp-server-code-execution-mode",
"run"
],
"env": {
"MCP_BRIDGE_RUNTIME": "podman"
}
}
}
}
# Use MCP tools in sandboxed code
result = await mcp_filesystem.read_file(path='/tmp/test.txt')
# Complex workflows
data = await mcp_search.search(query="TODO")
await mcp_github.create_issue(repo='owner/repo', title=data.title)
run_python only loads the MCP servers you request. Pass them via the servers array when you invoke the tool so proxies such as mcp_serena or mcp_filesystem become available inside the sandbox:
{
"code": "print(await mcp_serena.search(query='latest AI papers'))",
"servers": ["serena", "filesystem"]
}
If you omit the list the discovery helpers still enumerate everything, but any RPC call that targets an unloaded server returns Server '<name>' is not available.
Note: The servers array only controls which proxies are generated for a sandbox invocation. It does not set server configuration fields such as cwd. The cwd property is part of the host/server config and LLMs should call runtime.describe_server(name) or inspect runtime.list_loaded_server_metadata() to discover the configured cwd before assuming the server's working directory.
Note: server configurations can include an optional cwd property. If present the bridge will start the host MCP server process in that working directory; agents should check runtime.describe_server(name) to discover a server's configured cwd before making assumptions.
Project environments support CPython 3.11+. Ensure your local environment uses a compatible Python version:
uv python pin 3.13
uv sync
Runtime dependencies stay lean; dev dependencies (pytest, etc.) are available via the dev extra:
# Install with dev dependencies
uv sync --group dev
# Run tests
uv run pytest
# Or run without installing dev dependencies permanently
uv run --with pytest pytest
┌─────────────┐
│ MCP Client │ (Your Agent)
└──────┬──────┘
│ stdio
▼
┌──────────────┐
│ MCP Code Exec │ ← Discovers, proxies, manages
│ Bridge │
└──────┬──────┘
│ container
▼
┌─────────────┐
│ Container │ ← Executes with strict isolation
│ Sandbox │
└─────────────┘
Unlike traditional MCP servers that preload every tool definition (sometimes 30k+ tokens), this bridge pins its system prompt to roughly 200 tokens and trains the LLM to discover what it needs on demand:
discovered_servers() → learns which bridges are available without loading schemas.query_tool_docs("serena") → hydrates just that server's tool docs, optionally filtered per tool.mcp_serena.search() or mcp.runtime.call_tool().Result: context usage stays effectively constant no matter how many MCP servers you configure.
Process:
run_python(code, servers, timeout)/ipc volume, and exports MCP_AVAILABLE_SERVERSThe bridge automatically discovers MCP servers from multiple configuration sources:
Supported Locations:
Note: Earlier sources take precedence. If the same server is defined in multiple locations, the first one wins.
Example Server (~/MCPs/filesystem.json):
{
"mcpServers": {
"filesystem": {
"command": "npx",
"args": ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"]
}
}
}
Note: To prevent recursive launches, the bridge automatically skips any config entry that appears to start
mcp-server-code-execution-modeagain (includinguvx … mcp-server-code-execution-mode run). SetMCP_BRIDGE_ALLOW_SELF_SERVER=1if you intentionally need to expose the bridge as a nested MCP server.
When you rely on docker mcp gateway run to expose third-party MCP servers, the bridge simply executes the gateway binary. The gateway is responsible for pulling tool images and wiring stdio transports, so make sure the host environment is ready:
docker login for every registry referenced in the gateway catalog (e.g. Docker Hub mcp/* images, ghcr.io/github/github-mcp-server). Without cached credentials the pull step fails before any tools come online.github-official needs github.personal_access_token, others may expect API keys or auth tokens. Use docker mcp secret set <name> (or whichever mechanism your gateway is configured with) so the container sees the values at start-up.failed to connect: calling "initialize": EOF during the stdio handshake.list_tools only returns the internal management helpers (mcp-add, code-mode, …), the gateway never finished initializing the external servers—check the gateway logs for missing secrets or registry access errors./ipc/entrypoint.py and related handshake metadata) live under ~/MCPs/ by default. Set MCP_BRIDGE_STATE_DIR to relocate them.podman machine set --rootful --now --volume <state_dir>:<state_dir> so the VM can mount the directory. On older podman machine builds that do not support --volume, the bridge now probes the VM with podman machine ssh test -d <state_dir> and proceeds if the share is already available.docker run --rm -v ~/MCPs:/ipc alpine ls /ipc (or the Podman equivalent) and confirm the files are visible.# List and filter files
files = await mcp_filesystem.list_directory(path='/tmp')
for file in files:
content = await mcp_filesystem.read_file(path=file)
if 'TODO' in content:
print(f"TODO in {file}")
# Extract data
transcript = await mcp_google_drive.get_document(documentId='abc123')
# Process
summary = transcript[:500] + "..."
# Store
await mcp_salesforce.update_record(
objectType='SalesMeeting',
recordId='00Q5f000001abcXYZ',
data={'Notes': summary}
)
# Jira → GitHub migration
issues = await mcp_jira.search_issues(project='API', status='Open')
for issue in issues:
details = await mcp_jira.get_issue(id=issue.id)
if 'bug' in details.description.lower():
await mcp_github.create_issue(
repo='owner/repo',
title=f"Bug: {issue.title}",
body=details.description
)
from mcp import runtime
print("Discovered:", runtime.discovered_servers())
print("Cached servers:", runtime.list_servers_sync())
print("Loaded metadata:", runtime.list_loaded_server_metadata())
print("Selectable via RPC:", await runtime.list_servers())
# Peek at tool docs for a server that's already loaded in this run
loaded = runtime.list_loaded_server_metadata()
if loaded:
first = runtime.describe_server(loaded[0]["name"])
for tool in first["tools"]:
print(tool["alias"], "→", tool.get("description", ""))
# Ask for summaries or full schemas only when needed
if loaded:
summaries = await runtime.query_tool_docs(loaded[0]["name"])
detailed = await runtime.query_tool_docs(
loaded[0]["name"],
tool=summaries[0]["toolAlias"],
detail="full",
)
print("Summaries:", summaries)
print("Cached tools:", runtime.list_tools_sync(loaded[0]["name"]))
print("Detailed doc:", detailed)
# Fuzzy search across loaded servers without rehydrating every schema
results = await runtime.search_tool_docs("calendar events", limit=3)
for result in results:
print(result["server"], result["tool"], result.get("description", ""))
# Synchronous helpers for quick answers without extra awaits
print("Capability summary:", runtime.capability_summary())
print("Docs from cache:", runtime.query_tool_docs_sync(loaded[0]["name"]) if loaded else [])
print("Search from cache:", runtime.search_tool_docs_sync("calendar"))
Example output seen by the LLM when running the snippet above with the stub server:
Discovered: ('stub',)
Loaded metadata: ({'name': 'stub', 'alias': 'stub', 'tools': [{'name': 'echo', 'alias': 'echo', 'description': 'Echo the provided message', 'input_schema': {...}}]},)
Selectable via RPC: ('stub',)
Clients that prefer listMcpResources can skip executing the helper snippet and instead request the
resource://mcp-server-code-execution-mode/capabilities resource. The server advertises it via
resources/list, and reading it returns the same helper summary plus a short checklist for loading
servers explicitly.
run_python toolmcp-find/mcp-add)GPLv3 License
For issues or questions, see the documentation or file an issue.
An MCP server that executes Python code in isolated rootless containers with optional MCP server proxying. Implementation of Anthropic's and Cloudflare's ideas for reducing MCP tool definitions contex
ภาพรวม
An MCP server that executes Python code in isolated rootless containers with optional MCP server proxying. Implementation of Anthropic's and Cloudflare's ideas for reducing MCP tool definitions context bloat.
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คัดลอกคอนฟิก stdio สำหรับ Cursor, Claude Desktop, Claude Code หรือ VS Code ได้ในหน้านี้ คอนฟิกนี้ใช้การติดตั้งของผู้เผยแพร่ ไม่ใช่พร็อกซีของ PlugMCP
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MCP Server Code Execution Mode ทำงานแบบโลคัลผ่าน stdio
ตรวจสอบล่าสุดเมื่อ 2026-10-28 An MCP server that executes Python code in isolated rootless containers with optional MCP server proxying. Implementation of Anthropic's and Cloudflare's ideas for reducing MCP tool definitions context bloat.
