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LLMs and modern sandbox primitives create a new opportunity for extensible software on the web, enabling developers to build solid core applications that users can safely extend via LLM-generated extensions.
Jeremy Morrell argues that LLMs dramatically reduce the cost of authoring extensions while modern sandbox primitives lower deployment costs and improve security, creating a new opportunity for extensible web applications where developers provide a solid core and users extend it safely with LLM assistance. ✦ AI generated
Jeremy Morrell · Simon Willison's Weblog · 2026-08-19 · original ↗
My hypothesis is that there is a new opportunity for Extensible Software on the web. LLMs radically lower the cost of authoring extensions, and modern sandbox primitives lower the deployment cost and provide good security boundaries. We can build our app as a solid, accountable core, and allow users to safely extend it in many directions by having LLMs fill in the missing pieces. We can give our users super powers.
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- ·LLMs radically lower extension authoring cost
- ·Sandboxes lower deployment cost + security
- ·Build solid core, users extend safely
- ·LLMs fill missing pieces for users
- ·Developer: accountable core application
- ·User: superpowers via LLM extensions
- ·Security boundaries from sandbox primitives
- ·Multiple extension directions possible
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