Fiber, an API-to-agent compiler with receipts

Field notes

Fiber describes a pipeline that normalizes OpenAPI contracts before projecting them into generated clients, MCP tools, and agent-facing workflows. Its compatibility layer is intended to compare the same task across interfaces and providers, recording traces, errors, retries, token counts, latency, and cost. The visible Stripe example uses 25 paired test-mode runs and links to raw JSON, while the build plan sets release gates around deterministic diffs, compiling packages, passing task assertions, and trace-linked scores.