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Invariant: Guardrails for secure and robust agent development. It is listed under Development & Code on AI Registry as a free tool.
The tools below are approved listings in the same category, ordered by how closely their tags match Invariant. This is an automatic list. We have not written a researched verdict for Invariant yet, so treat it as a shortlist and check each vendor's pricing page before switching.
Built from each tool's listing. Vendors can update their own listing after claiming it.
Scan MCP servers for potential threats & security findings.
This is Cisco's open source scanner for Model Context Protocol servers, announced in a Cisco blog post as a tool for securing the AI agent supply chain. It addresses the risk that public MCP registries and websites host thousands of servers, which run untrusted code and hand AI interactions to third party tools. The p...
Event-sourced graph runtime for durable and stateful agents
activegraph is an open source Python runtime for long running AI agents from Yohei Nakajima, the creator of BabyAGI. It records everything an agent does in an append only event log and projects that log into a live graph of beliefs, tasks, evidence, decisions and dependencies. The graph becomes the agent's world: what ...
ADHD — a skill for coding agents.
adhd is an open source reasoning harness for coding agents published by Divergent Labs, a research group building reasoning systems around divergent, nonlinear thinking. Instead of letting a model commit to its first plausible idea, the harness generates many candidate solutions in parallel, each under a different cogn...
Official Aeon - the open-source autonomous AI agent framework.
Aeon is an open source framework for autonomous AI agents that run recurring work unattended. You give it a direction and it draws on a catalogue of 85 skills to carry out tasks such as priority briefs, market monitoring, pull request reviews, research digests and security scans, without approval loops. It runs on GitH...
Codex for Android, iOS & Mac.
Aether is an open source AI agent app for the phone and desktop, originally built for Android and now also available for iOS and macOS. It pairs a polished conversation interface, inspired by apps such as ChatGPT and Codex, with a local agent engine built on the Pi harness kernel, so the agent can run shell commands, c...
A fast and minimal framework for building agentic systems
Agency is an open source Python library that provides an actor model framework for building agent integrated systems. It gives developers a minimal foundation for connecting AI agents with traditional software, so they can design whatever architecture their application needs rather than adopting a fixed agent pattern. ...