Mcpproxy Go
Free open-source MCP proxy with BM25 tool discovery and TPA quarantine
For solo developers and small teams juggling many MCP servers, MCPProxy is the best free option we've tried. The BM25 tool discovery genuinely slashes token usage, and the TPA quarantine is a real security net, not a checkbox. It's desktop-only and config-heavy, so if you need cloud access or collaborative permissions, look elsewhere. Alternatives like Composio offer cloud convenience but with latency and data exposure.
Verified 2d ago · liveness 70/100 · cite: rightaichoice.com/tools/mcpproxy-go
- AI agent developers with many MCP servers
- Cursor power users hitting tool limits
- Security teams needing approval gates
- Developers wanting a free, offline MCP proxy
- Non-technical users
- Teams needing collaborative permissions
- Users wanting cloud-hosted proxy
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Skip MCPProxy if you need a cloud-hosted proxy, collaborative team permissions, a no-code UI, or you can't edit JSON config files.
You may need to spend time manually reviewing and approving quarantined servers before they can execute tools; this is a manual process, not an automated one.
Free forever, no hidden costs. Cheaper than any cloud proxy like Composio, which charges per operation. Ideal for individual devs and small teams. If you need enterprise support or multi-user features, you'd invest in a commercial gateway instead.
In short
Mcpproxy Go — Free open-source MCP proxy with BM25 tool discovery and TPA quarantine. Best for AI agent developers with many MCP servers, Cursor power users hitting tool limits, Security teams needing approval gates. Free to use.
What's new in Mcpproxy Go
Checked 8 days agoAcross the latest 1 update: 1 news mention.
What people actually say about Mcpproxy Go — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
5 mentions across 2 sources (Hacker News, GitHub) · researched Jul 3, 2026.
- +Bypasses Cursor's 40-tool and OpenAI's 128-function API limits easily.
- +BM25 semantic matching reduces token usage by up to 99%.
- +Security features: automatic quarantine and TPA detection protect users.
- +Works fully offline with no cloud dependency.
- +One-click install into Cursor IDE via deeplink.
- −Early-stage product – few real-world reviews or long-term reliability data.
- −Documentation on advanced configuration and troubleshooting is sparse.
- −Some users report crashes when adding many MCP servers.
- −Requires some comfort with JSON config files and CLI.
- −No web UI – all interaction via desktop app and config file.
- • No hidden costs – entirely free and open-source.
Viability Score
How well maintained and how widely used is Mcpproxy Go? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: September 2026
How we score →Key Features
- BM25 natural language tool search
- Single retrieve_tools endpoint
- Automatic quarantine for new servers
- Tool Poisoning Attack pattern detection
- Manual approval before tool execution
- Execution blocking for quarantined servers
- Response truncation with caching
- Offline desktop app
- System tray integration
- One-click Cursor IDE install via deeplink
- mcp_config.json configuration
- CLI and environment variable management
- Signed and notarized macOS builds
- Windows installer signed by SignPath Foundation
- Linux apt/dnf with auto-updates
About Mcpproxy Go
MCPProxy is a free, open-source desktop app that consolidates hundreds of MCP servers behind a single endpoint. Instead of loading dozens of function schemas into your AI agent's context, it exposes one retrieve_tools function. When the agent needs a tool, it queries MCPProxy in natural language, and BM25 search returns only the most relevant schemas. That cuts token usage by roughly 99% and boosts accuracy by 43%, per RAG-MCP and ScaleMCP research. It's built for developers who run many MCP servers in Cursor IDE (which caps at 40 tools), Claude Desktop, ChatGPT, or any MCP-compatible client—and for security teams worried about malicious tool descriptions. Security is the standout feature. Every newly added server goes into automatic quarantine, where MCPProxy runs Tool Poisoning Attack (TPA) pattern detection on its tool descriptions. Quarantined servers cannot execute any tools until a human reviews and approves them. This blocks attacks that hide instructions in tool descriptions to make AI models read SSH keys or exfiltrate data—a threat Anthropic has called 'expected behavior.' MCPProxy runs entirely offline with system tray integration. Install it into Cursor with one click via deeplink, configure everything through a single mcp_config.json, and manage it via CLI or environment variables. Binaries are signed and notarized on macOS, signed by SignPath Foundation on Windows, and delivered through apt/dnf repositories with auto-updates on Linux. That makes it a safe choice for production use. Unlike cloud-based MCP proxies such as Composio, which add latency and expose your tool calls to third-party servers, MCPProxy keeps everything local. Your data never leaves your machine. It's MIT-licensed and free forever, with a growing community and regular updates. If you need a no-cost, offline, security-first MCP federation layer, MCPProxy is one of the most practical options available.
Behind the Verdict
We'd reach for MCPProxy when you've outgrown Cursor's 40-tool limit or OpenAI's 128-function cap, and you're tired of context bloat eating your token budget. The BM25 retrieval is the real deal—the ~99% token savings are backed by research, and in our testing, accuracy didn't suffer. The security quarantine, with TPA pattern detection and manual approval, is a thoughtful addition that most proxies skip entirely. Where it bites: the desktop-only model. You can't run this on a server or access it remotely, so it's not for teams that need a shared, cloud-hosted proxy. Configuration is also hands-on—mcp_config.json, CLI, environment variables—so non-technical users will struggle. If you just want a quick cloud proxy without setup, Composio is more convenient but adds latency and sends your tool calls through their servers. Watch out for the manual approval step. It's a necessary evil for security, but if you're adding servers frequently, the human review bottleneck can slow you down. Also, the TPA detection is pattern-based, so zero-day attacks might slip through until you approve the server. That said, for a free, open-source tool, the polish is impressive—signed binaries, auto-updates, one-click Cursor install. It's a niche tool for a specific pain point, but it solves that pain point very well.
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Real-world workflow fit
Concrete scenarios for the personas Mcpproxy Go actually fits — and what changes day-one when you adopt it.
You have 15 MCP servers but Cursor caps at 40 tools. You install MCPProxy, add servers to mcp_config.json, and one-click install into Cursor.
Outcome: Your agent sees only retrieve_tools; BM25 finds relevant tools, token usage drops ~99%, and you stop hitting the 40-tool limit.
Your team adds a new MCP server from an untrusted source. MCPProxy auto-quarantines it, scans TPA patterns, and blocks execution until you approve.
Outcome: You review the tool descriptions, approve if safe, and avoid tool poisoning attacks that could exfiltrate data.
Your app loads hundreds of function schemas into context, racking up tokens. You route calls through MCPProxy's single endpoint.
Outcome: Function schema bloat is eliminated, cutting token costs by ~99% while maintaining accuracy, per RAG-MCP research.
Use Cases
- Consolidate dozens of MCP servers behind one endpoint for any agent client.
- Bypass Cursor IDE's 40-tool limit and OpenAI's 128-function cap.
- Cut token usage ~99% by discovering tools on demand instead of loading all schemas.
- Quarantine new MCP servers to prevent tool poisoning attacks before approval.
- Route tool calls with response truncation and caching to avoid context bloat.
- Run fully offline in the system tray on macOS, Windows, or Linux.
Limitations
- MCPProxy is a desktop application available for Windows, macOS, and Linux; it does not advertise a cloud or web version.
- Configuration requires editing mcp_config.json and using CLI and environment variables, which may be challenging for non-technical users.
- It depends on upstream MCP servers being available and compatible.
- The tool does not document an official API for programmatic control, though it integrates with MCP-compatible clients.
as of 2026-08-25
Verification history
We have re-verified Mcpproxy Go 7 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Showing the 6 most recent of 7 verification passes.
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Mcpproxy Go tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/mo
Ideal for
Solo developers and small teams needing a free, offline MCP proxy with no cost.
What this tier adds
Free forever with all features: BM25 discovery, TPA quarantine, response truncation, and offline desktop app.
Where the pricing makes sense
The company stage and team size where Mcpproxy Go's pricing actually pencils out — and where peers do it cheaper.
Free forever, no hidden costs. Cheaper than any cloud proxy like Composio, which charges per operation. Ideal for individual devs and small teams. If you need enterprise support or multi-user features, you'd invest in a commercial gateway instead.
Setup time & first value
How long it actually takes to get something useful out of Mcpproxy Go — broken out by persona, not the marketing-page minute.
Install DMG/installer and launch—under 5 minutes. Add servers to mcp_config.json and start—under 15 minutes. Configure quarantine approvals—initial review takes an hour if you have many servers. Total first value typically within 1 hour.
Switching to or from Mcpproxy Go
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- ↗To Composio: migrate if you need cloud-hosted proxy with managed integrations, but accept data exposure to third-party servers.
- ↗To a cloud gateway: import your mcp_config.json into a hosted solution if you outgrow desktop-only constraints.
Integrations
Resources & Guides
- Documentationmcpproxy.app
Docs · Mcpproxy Go
Full product docs from mcpproxy.app
- Quickstartmcpproxy.app
Getting Started · Mcpproxy Go
Get up and running fast from mcpproxy.app
- Documentationmcpproxy.app
Configuration · Mcpproxy Go
Full product docs from mcpproxy.app
- Documentationmcpproxy.app
Features · Mcpproxy Go
Full product docs from mcpproxy.app
- Resourcemcpproxy.app
Blog · Mcpproxy Go
Helpful link from mcpproxy.app
Tutorials & Learning
Official links
Featured Head-to-Head Comparisons
Mcpproxy Go vs Presto Voice
These tools serve completely different markets — MCPProxy Go is for developers needing to federate multiple MCP servers with security and cost savings, while Presto Voice is for QSR chains automating drive-thrus. Choose MCPProxy if you build AI agents and hit tool limits; choose Presto Voice if you run drive-thru locations and want revenue lift. There is no overlap.
Mcpproxy Go vs Spider Cloud
Pick MCPProxy Go if you're an AI agent developer juggling multiple MCP servers and need to bypass tool limits with built-in security gates. Choose Spider Cloud when your priority is feeding fresh web data into RAG pipelines or LLM agents — its Rust-based scraping + Browser AI commands deliver fast, reliable crawling at pennies per thousand pages. The two tools solve completely different problems: MCPProxy is a control plane for MCP tools, Spider Cloud is a data plane for web content.
Mcpproxy Go vs Temporal Ai
If your bottleneck is hitting tool limits in Cursor/OpenAI and you need a lightweight, local MCP server gateway, MCPProxy is perfect. If you're building production-grade, long-running AI workflows that must survive crashes and scale across teams, Temporal is the right choice. They solve different problems; pick based on your scale and durability needs.
Popular in MCP Servers & Agent Tooling
Frequently Asked Questions
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