Overview

ACI — ACI.dev is the open source tool-calling platform that hooks up 600+ tools into any agentic IDE or custom AI agent through direct function calling or a unified MCP server. The birthplace of VibeOps.

ACI.dev is the open source tool-calling platform that hooks up 600+ tools into any agentic IDE or custom AI agent through direct function calling or a unified MCP server. The birthplace of VibeOps. The repository is written primarily in Python and has 4,777 GitHub stars.

Collected from GitHub on 2026-05-21. Repository signal: 4,777 stars, Python, pushed on 2026-04-24. Review the official website and docs before publishing.

4,777 GitHub stars

Python codebase

Topics: agents, ai, ai-agents, api, developer-tools

Features & capabilities

Everything it does, in plain English.

Feature4,777 GitHub starsIncluded

FeaturePython codebaseIncluded

FeatureTopics: agents, ai, ai-agents, api, developer-toolsIncluded

API AccessProgrammatic access available for developers.Available

PlatformsWeb · API

The honest take

Where it shines, where it stumbles.

✓ Pros

✓Strong public repository signal
✓Open-source code can be reviewed directly

! Watch-outs

!Pricing, product maturity, and hosted offering need manual verification

Who it's for

Where ACI pays for itself fast.

— Use case

Connect external systems to AI assistants

— Use case

Build Model Context Protocol integrations

Community reviews

Share your take on ACI

4.4

★★★★★

24 reviews

5★

4★

3★

2★

1★

Zara J. ✓ Verified

Professor

★★★★★

1 months ago

Happy with my subscription

Good value for the price. The API is well-documented and easy to work with. The collaboration features are genuinely well thought-out. Integration with my existing tools was seamless — no friction at all. The learning curve was steeper than expected. Looking forward to seeing how it improves.

Nicole Z. ✓ Verified

Solutions Architect · GitHub

★★★★★

6 months ago

Really good — a few things to improve

Works really well for my use case. The onboarding flow was smooth and I was productive from day one. Best tool in this category, hands down.

Amanda P. ✓ Verified

VP of Engineering · freelance

★★★★★

10 months ago

Solid product, recommended

Works really well for my use case. The ROI was clear within the first week of using it. The free tier is genuinely generous compared to competitors. A few missing integrations I'd like to see added. A staple in my tech stack now.

Sofia K. ✓ Verified

Full Stack Developer · my own agency

★★★★★

1 years ago

Incredible — highly recommend

This is exactly what I was looking for. The AI doesn't just suggest — it learns from my preferences over time. The free tier is genuinely generous compared to competitors. Will continue using this long-term.

Ben R. ✓ Verified

Professor · Series A startup

★★★★★

1 years ago

Useful and reliable

Works really well for my use case. It handles edge cases better than anything else I've tried. I use this daily and it's become essential to how I work. Reduced the time I spend on this task by about 70%. Customer support response times could be faster. A staple in my tech stack now.

Sarah B. ✓ Verified

Software Engineer · a marketing agency

★★★★★

1 years ago

Incredible — highly recommend

Absolutely love this tool. Customer support responded within hours and solved my issue. The interface is intuitive enough that I didn't need to read any docs. Pricing is fair for the value you get. A staple in my tech stack now.

Ryan H. ✓ Verified

Researcher · Microsoft

★★★★★

1 years ago

Happy with my subscription

Mostly great, minor complaints. The ROI was clear within the first week of using it. My only complaint is the pricing could be more competitive. Will continue using this long-term.

Heather W. ✓ Verified

Full Stack Developer · early-stage startup

★★★★★

1 years ago

Changed how I work completely

Can't imagine working without it now. It handles edge cases better than anything else I've tried. It handles edge cases better than anything else I've tried. Would recommend to anyone in my industry.

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