WebMCP winners: Observatory lets humans and agents co-edit fantasy maps on one canvas
OpenAIDevs · x · 2026-09-29
OpenAI Devs highlights WebMCP Challenge winners from Devpost, showcasing human-agent collaboration on a shared semantic workspace.
- Observatory by Martin Hooijmans: a local-first fantasy map builder where writers paint terrain, rooms, walls, objects and labels, while a browser agent inspects and modifies the same map via bounded WebMCP tools — prompts become editable vector strokes, not flattened images. Humans and agents share the same state, persistence and undo paths; destructive changes require visible single-use approval tokens.
- Built with Vue 3, Pinia, PixiJS/WebGL, IndexedDB and Vite; tools registered via document.modelContext.registerTool with strict JSON schemas, optimistic revision checks, idempotent operation IDs and compact result envelopes.
- Mandate by Harzer Heribert turns chosen CRM records, fields and a time limit into scoped WebMCP tools for an agent.
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