A new benchmark just ranked enterprise software by how open it is to AI agents — and the results should inform every tool decision you make this year.
A benchmark called ToolBench just dropped ratings for how well enterprise apps support AI agents via MCP (Model Context Protocol). The findings aren't surprising if you've been paying attention — but seeing it ranked is a different thing entirely.
What Changed
GitHub and Figma came out on top. Slack, Workday, Meta's ad platform, and WhatsApp landed at the bottom. The report notes that Slack actively limits requests from external agents, and Workday makes agent integration a "dead end" — meaning automation workflows that touch Workday hit a wall by design.
This isn't about compatibility bugs. It's deliberate architecture. These vendors are choosing how open or closed to be, and the ones at the bottom of that list have made their position clear.
The Bigger Picture
This ranking arrives alongside a broader story: large enterprises are starting to build smaller internal tools and "vibe-code" customizations rather than replace their core software. The WSJ reported this today — companies aren't leaving Slack or Workday, they're building around them.
That's a revealing combination. Vendors that are closed to agents are counting on exactly that behavior: the switching cost is too high, so you stay, you work around the walls, and you keep paying. The closed architecture isn't a bug in their business model — it's the feature.
What This Means for You
If you're building AI-powered workflows for clients or your own stack, the openness of every tool in that chain now matters as much as the feature set. A tool that actively limits agent access is a future bottleneck. The ToolBench rankings give you a starting map.
Trish @ StackDrift
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