witanlabs/research-log

How we built Witan - four months of engineering an LLM spreadsheet agent

24
/ 100
Experimental

Leverages a multi-agent architecture with a REPL-based execution layer instead of discrete tool calls—allowing agents to write and execute inline scripts that compose operations more efficiently than sequential API requests. Implements structured reasoning workflows (disambiguate → define end state → plan → execute → verify) paired with domain-specific financial knowledge as reusable prompt skills, which proved more impactful than tool improvements alone. Uses programmatic benchmarking with pixel/layout/sequence comparison rather than LLM-as-judge evaluation to reliably detect regressions and guide development—the evaluation framework itself became critical to discovering architectural breakthroughs (74%→92% accuracy).

No License No Package No Dependents
Maintenance 10 / 25
Adoption 8 / 25
Maturity 3 / 25
Community 3 / 25

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Mar 02, 2026

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