I Compared a Local 4B, a Better Cloud Model, and Role Separation. The Results Were Weird.

Previously: 9 Bugs That All Looked Like a Working System · I Built an AI That Rewrites Its Own Prompts · The Edit That Fixed 4 Tasks and Broke 1 · I Let an LLM Rewrite Its Own Prompt. The Real Win Was the Gate That Rejected It. · I Tried 4 Models to Save My Self-Improving Agent. All 4 Failed.

AgentSelfEdit is an open-source sidecar that rewrites its own system prompt from execution feedback. It A/B tests edits and promotes only statistically-proven winners.

Repo: github.com/deghosal-2026/agent-self-edit/tree/v0.3.0

Release notes: docs/release/v0.3.0/release-notes.md

Field test report: docs/field-test/v0.3.0/FIELD_TEST_REPORT.md

I Compared a Local 4B, a Better Cloud Model, and Role Separation. The Results Were Weird.

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The Edit That Fixed 4 Tasks and Broke 1