Bitter Frontier What coding agents just made possible, where the bottleneck moved, and what deserves attention.

Evidence record / flue

A dated record of one change, kept so the writing that cites it can be checked. Compiled from the sources listed below by the research run, not written for reading. The judgment lives in the issues that cite it, below.

2026-10-13-flue-2-1-1-fixes-quadratic-trace-truncation-that-could-reset-cloudflare-durable-objects

2.1.1 fixes quadratic trace truncation that could reset Cloudflare Durable Objects. Fitting a long conversation to the trace attribute budget repeatedly serialized the remaining history, a quadratic path that the tagged changelog identifies as causing latency and Cloudflare Durable Object CPU-limit resets. 2.1.1 replaces that path with linear truncation for ordinary message arrays. The outside report’s 27-30 seconds of CPU is a reported measurement, not an independently repeated benchmark; the mechanism and shipped fix are established by the diff and release note.

Channel: tagged-release. Half: defect. Date: 2026-09-23 (2.1.1 publication; code committed 2026-09-21).

Operator consequence: Stop using the old 2.1.0 profile pin for long traced conversations, especially on Cloudflare. The fix begins in 2.1.1 and remains in 2.3.0. Verify that trace truncation stays within the CPU budget on your own large histories; keep content-policy decisions separate, since this fix does not turn content capture off.

Receipt

Finding metadata

Confidence
high

Run: 2026-10-13-profile-refresh-2026-09-21_2026-10-13-frontier-v0

Finding ID: 2026-10-13-flue-2-1-1-fixes-quadratic-trace-truncation-that-could-reset-cloudflare-durable-objects

Profile citations

  • Flue / claim / trace-truncation-linear

Source links

Primary links, including exact changelog lines when available.

  1. Flue
    tagged commit file2026-10-13-flue-2-1-1-fixes-quadratic-trace-truncation-that-could-reset-cloudflare-durable-objectswithastro/flue / CHANGELOG.md#L44-L53commit2026-10-13-flue-2-1-1-fixes-quadratic-trace-truncation-that-could-reset-cloudflare-durable-objectsgithub.com/withastro/flue/commit/756db7668b57dfa97076bbad92d5c26b2d81dc0dgithub release2026-10-13-flue-2-1-1-fixes-quadratic-trace-truncation-that-could-reset-cloudflare-durable-objectswithastro/flue / %40flue%2Fruntime%402.1.1official docs2026-10-13-flue-2-1-1-fixes-quadratic-trace-truncation-that-could-reset-cloudflare-durable-objectsgithub.com/withastro/flue/issues/742

Versioned source: run artifact