ToolSuture Fixes Broken AI Agent Tools Without Touching the Agent's Code

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A developer built ToolSuture, an AI recovery system, as an entry for the All Things Agentic Hackathon to address a overlooked reliability problem: tools changing underneath a deployed agent. Rather than rewriting the agent when an external API or tool contract changes, ToolSuture runs an observe-diagnose-repair loop using Gemini 1.5 Flash on Vertex AI to assess whether the old and new tool contracts remain semantically equivalent. If they do, the system creates a compatibility layer around the frozen agent and replays the original mission to verify success — with zero changes to the agent's code. Crucially, ToolSuture also refuses to act when a change appears structurally similar but is operationally different, such as a recoverable deletion becoming permanent — blocking execution entirely. The project reframes agent autonomy not as permitting more actions, but as distinguishing safe recoverable changes from dangerous irreversible ones.

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