# Strata Mundo

- **Event:** [Built with Opus 4.7: a Claude Code hackathon](https://cerebralvalley.ai/e/built-with-4-7-hackathon)
- **When:** Apr 21 at 12:00 PM – Apr 27 at 2:00 AM (EDT)
- **Where:** Online
- **Team:** [Barbara Jauregui Wurst](https://cerebralvalley.ai/u/Dadababa)
- **GitHub:** https://github.com/barbarajauregui-dadababa/stratamundo
- **Demo video:** https://youtu.be/EVB_bCUYySg
- **Gallery:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/250

Strata Mundo — your math mastery voyage

Most math tools tell you a percentage. Strata Mundo tells you how a learner reasons.

A learner builds fractions by dragging brass pieces onto a target — every drag, removal, and reset is recorded as process telemetry. Claude Opus 4.7 reads the full trajectory and produces a categorical mastery map per CCSS standard: mastered, building the skill, misconception detected (with the specific named wrong mental model and traceable evidence), or not yet probed. Never percentages. A Plan Architect Managed Agent then synthesizes a tailored plan: 2–3 activities per gap, drawn from a curated multimodal library, sequenced concrete → representational → abstract.

The library grows from contributions. Anyone — guides, parents, teachers, learners themselves — can submit a new activity. Every submission is reviewed by Opus 4.7 against six published pedagogical criteria, then by a human. Criteria are public on the methodology page.

Built solo in 4 days for the Cerebral Valley Built with Opus 4.7 hackathon. Live at stratamundo.com. Everything user-facing — home, methodology, contribute, search, voyage, report — uses Opus 4.7 as the substantive reasoning engine. Categorical, never numeric. Misconception-named, never vague. Community-grown, AI-vetted, human-approved.

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Markdown version of https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/250. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt