"The FastAPI moment for MCP servers."

⭐ What Is mcp-forge?

mcp-forge eliminates MCP server boilerplate entirely. You write a typed Python function. The framework derives the JSON Schema from your type hints, validates inputs at runtime, and exposes the tool over STDIO, HTTP, or SSE — without changing a single line of your logic.

Every MCP server starts the same way: hand-craft JSON Schema, wire a transport loop, handle notifications/initialized, redirect stderr, copy-paste validation logic. mcp-forge does all of that for you.

from mcp_forge import Forge

app = Forge(name="my-server", version="1.0.0")

@app.tool(description="Search the knowledge base")
async def search(query: str, limit: int = 10) -> list[dict]:
    """Returns ranked results for the given query."""
    ...  # your logic here

if __name__ == "__main__":
    app.run()  # STDIO — Claude Desktop / Cursor / VS Code ready

No JSON Schema by hand. No transport boilerplate. No config files.

⚡ Core Doctrine

These are not features. These are design laws.

☔ Principle	🔧 Implementation
Schema is Derived, Never Written	Pydantic v2 generates full draft-07 JSON Schema from type hints — automatically
Transport is a Runtime Concern	STDIO · HTTP · SSE — switch with one flag, tool code never changes
Contrib is Opt-In	app.include(memory) adds tools; you stay in control, zero forced dependencies
Strict by Default	mypy strict + ruff + 100% typed public API — no surprises in production
Testing Without a Server	ForgeTestClient calls tools directly — no sockets, no mocking, no overhead
Zero Boilerplate	@app.tool() is the entire registration API — one decorator, full MCP compliance

🚀 Quick Start

# Install
pip install mcp-forge

# Scaffold + run
mcp-forge new my-server && cd my-server
mcp-forge run --reload

Connect to Claude Desktop in 30 seconds:

{
  "mcpServers": {
    "my-server": {
      "command": "python",
      "args": ["-m", "my_server"]
    }
  }
}

Switch to HTTP transport with one flag:

mcp-forge run --transport http --port 8080

✨ Features

Feature	Description
🏗️ Declarative Tools	@app.tool() — no schema files, no registration calls
🧠 Auto JSON Schema	Pydantic v2 under the hood — full draft-07 generated from type hints
✅ Runtime Validation	Inputs validated before execution — errors as proper MCP-spec responses
🚀 Multi-Transport	STDIO · HTTP · SSE — switch at runtime, logic unchanged
⏳ Async-First	async def and def tools work side by side — no event loop management
🔌 Contrib Routers	memory · filesystem · web — one-line include
🧪 Testing Client	ForgeTestClient — no server, no mocking, no sockets
📦 PEP 561 Typed	Ships py.typed — full mypy strict + Pyright support

📚 Examples

Minimal server

from mcp_forge import Forge

app = Forge(name="calculator")

@app.tool()
def add(a: float, b: float) -> float:
    """Add two numbers."""
    return a + b

app.run()

With contrib tools

from mcp_forge import Forge
from mcp_forge.contrib import memory, filesystem, web

app = Forge(name="agent-tools")
app.include(memory)      # remember(), recall(), forget(), list_memory()
app.include(filesystem)  # read_file(), write_file(), list_dir(), delete_file()
app.include(web)         # fetch_url()

app.run()

Unit testing — no server needed

from mcp_forge.testing import ForgeTestClient

client = ForgeTestClient(app)

def test_add():
    result = client.call("add", {"a": 2, "b": 3})
    assert result == 5

📁 Architecture

mcp-forge/
├── core/
│   ├── forge.py        ← Forge class — declarative app entrypoint
│   ├── schema.py       ← Auto JSON Schema from Pydantic v2
│   ├── validator.py    ← Input/output validation engine
│   ├── config.py       ← ForgeConfig dataclass
│   └── exceptions.py   ← MCP-aligned exception hierarchy
├── transports/
│   ├── stdio.py        ← STDIO — MCP spec 2024-11-05 compliant
│   ├── http.py         ← HTTP — FastAPI-based REST transport
│   └── sse.py          ← SSE — Server-Sent Events streaming
├── cli/
│   └── main.py         ← Typer CLI — new, run, validate, build
└── contrib/
    ├── memory.py       ← Scoped in-process memory store
    ├── filesystem.py   ← Safe filesystem tools with path sandboxing
    └── web.py          ← HTTP fetch with timeout and error handling

📦 Installation

# Core only (STDIO transport)
pip install mcp-forge

# With HTTP + SSE transports
pip install "mcp-forge[http]"

# Everything
pip install "mcp-forge[all]"

Requires: Python 3.11+ · pydantic>=2.0

🌍 Ecosystem Compatibility

Client	Transport	Status
Claude Desktop	STDIO	✅ Tested
Cursor	STDIO	✅ Tested
VS Code (GitHub Copilot)	STDIO · HTTP	✅ Tested
Continue.dev	HTTP · SSE	✅ Tested
Custom LLM agents	HTTP · SSE	✅ Tested

🤝 Contributing

Contributions are welcome. See CONTRIBUTING.md for the full guide.

git clone https://github.com/benni-os/mcp-forge
cd mcp-forge
pip install -e ".[dev]"
pytest

• 🐛 Found a bug? → Open an issue
• 💡 Have an idea? → Start a discussion
• 📜 See what's planned → ROADMAP.md

🌐 The Benni OS Ecosystem

mcp-forge is part of the Benni OS decentralized agentic architecture. The ecosystem is organized into modular Public Open-Source Infrastructure and Proprietary Core Autonomous Systems:

🔓 Public Open-Source Infrastructure

Layer / Domain	Repository	Maintainer	Description	Status
Security & Defense	agent-cyber-sentinel	@BenniAlencar	Tier-0 Zero-Trust runtime security shield, prompt injection firewall & secret redactor.	🟢 Stable (Apache-2.0)
Execution & State	agent-run-ledger	@BenniAlencar	Resumable multi-step execution state machine, anti-loop circuit breaker & crash recovery.	🟢 Stable (Apache-2.0)
Long-Term Memory	agent-memory-mesh	@BenniAlencar	Sovereign bi-temporal knowledge graph & episodic memory with multi-tenant isolation.	🟢 Stable (Apache-2.0)
Zero-Trust Verification	reality-lock	@BenniAlencar	Cryptographic execution verification & signed SHA-256 evidence ledgers for side-effects.	🟢 Stable (Apache-2.0)
Autonomous Web Perception	agent-browser-mesh	@BenniAlencar	High-speed, zero-token-waste autonomous browser engine with semantic DOM-Delta compaction & native MCP.	🟢 Stable (Apache-2.0)
MCP Tooling Matrix	mcp-forge	Benni-OS	Rapid developer toolchain for building, validating, and publishing Model Context Protocol servers.	🟢 Public OSS
Local Hybrid Inference	benni-inference-engine	Benni-OS	GPU+CPU MoE expert offloading runtime with Skill 81 Ceiling Extraction on consumer hardware.	🟢 Public OSS
Federated Execution	benni-operator-gateway	Benni-OS	Unified policy-governed operator gateway for dispatching actions across local and cloud environments.	🟢 Public OSS
Model Routing Hub	benni-nexus	Benni-OS	Intelligent LLM model router optimizing for latency, cost, and task-specific reasoning ceilings.	🟢 Public OSS
Autonomous Community	community-autopilot	Benni-OS	Autonomous event-driven community management, issue triage, and repository telemetry.	🟢 Public OSS

---

🔒 Proprietary Core & Autonomous Systems (Enterprise Benni OS)

The open-source stack serves as the decentralized foundation for the enterprise-grade Benni OS autonomous swarm kernel:

System	Role & Scope	Architecture Doctrine	Access
Benni Master OS	Central operating system kernel v9.4 governing 43 canonical skills, runtime contracts, and swarm coordination.	Universal Skills 00–100	🔒 Private Core
Project Benjamin	Sovereign autonomous execution orchestrator with typed handoff contracts and zero-human-in-the-loop loops.	Skill 93 Autonomous Dispatch	🔒 Private Core
Project Adam	Agent synthesis, benchmark evaluation, and continuous recursive self-evolution engine.	Skill 92 Self-Evolution	🔒 Private Core
Benni Control Plane	Distributed state persistence, atomic snapshot restore protocols, and multi-tenant ledger governance.	Skill 90 Control Plane OS	🔒 Enterprise
Benni Social Hub	Multi-channel content authority distribution, attribution engine, and automated revenue funnels.	Skill 52 & Skill 95 Revenue Loop	🔒 Enterprise
Benni Canvas	Autonomous UI engineering subsystem v14.0 delivering generative high-end motion and responsive dashboards.	Skill 54 Open Design & Skill 56	🔒 Enterprise
Benni Nemesis	Federated integration gateway connecting cloud APIs, vector databases, and multi-cloud webhooks.	Skill 97 Nemesis Gateway	🔒 Private Core
Benni OS Genesis	Structured prompt engineering compilation and generative knowledge distillation engine.	Skill 70 Model Behavior	🔒 Private Core

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👉 Explore & Connect with the Benni OS Ecosystem:

• Official Website: https://bennios.dev
• Benni Operator Hub: https://hub.bennios.dev
• GitHub Organization: https://github.com/benni-os
• Maintainer Profile: https://github.com/BenniAlencar
• Documentation & Blueprints: https://docs.bennios.dev

mcp-forge — Open-Source Python MCP Framework by Benni OS

ZERO_BOILERPLATE • AUTO_SCHEMA • MULTI_TRANSPORT • STRICT_TYPING • MIT_LICENSE

Engineered by Benni Alencar and the Benni OS Core Engineering Group · If mcp-forge saves you time, give it a ⭐

• agent-deep-research: Autonomous multi-source deep research engine with cryptographic citation proofs & >85% token distillation.

• agent-code-sandbox: Micro-second zero-dependency code sandbox with AST security guards & context token shielding.