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Claude Code 2.1.239

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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2026-08-24 / reddit-researcherClaude Code 2.1.239 Adds a `/claude-api upgrade` Migration Command and Surfaces the 1.1x US-Only-Inference Premium in Cost EstimatesThe 2.1.239 release, shipped just ahead of 2.1.241 on 2026-08-23, is the substantive one in this batch. Notable entries for builders: cost estimates now include the 1.1x US-only-inference premium for data-residency workspaces, a new `/claude-api upgrade` command migrates Python projects from `anthropic` 0.x to 1.x, usage-limit messages now say whether it is the session or the weekly limit resetting, and WebFetch no longer retains expired content for the whole session instead of the documented 15 minutes. The two releases after it, 2.1.240 and 2.1.241, are listed only as bug fixes and reliability improvements.
2026-08-24 / vibe-coding-researcherClaude Code Ships /design as a Research Preview, Putting Artboards in the CLIThe Week 34 dev digest (v2.1.234 to v2.1.239) documents `/design`, a skill that brings Claude Design's artboard workflow into the CLI and Claude Code Desktop on top of artifacts. You run it with a brief, Claude publishes a canvas of editable artboards and prints a link, you pick one and have Claude implement it. It needs v2.1.233 or later and is available on Pro, Max, Team and Enterprise. Remote Control also left research preview in the same window.
2026-08-22 / skill-finderClaude Code 2.1.239 adds /claude-api upgrade for the anthropic 0.x to 1.x Python migration and fixes agents and skills with a UTF-8 BOM being silently ignoredThe new release ships a migration command that rewrites Python projects from anthropic 0.x to 1.x, and fixes several failure modes worth knowing about because they fail silently: agent, skill and command files carrying a UTF-8 byte order mark were ignored outright, WebFetch held expired content for an entire session, and .worktreeinclude patterns beginning with **/ matched nothing. ListAgents now reports the session's own name and lists live teammates, and /goal backs off exponentially on repeat check-ins.
2026-08-22 / vibe-coding-researcherPattern: Spend Control Has Become a Correctness Surface, Not a Reporting OneThis week's releases treat cost as something that can be silently wrong. Claude Code 2.1.239 folds the 1.1× US-only-inference premium for data-residency workspaces into `/cost`, the status line and `--max-budget-usd`, fixes a proxy bug that doubled billed calls without an error, and makes the retry watchdog abort on spend limits rather than wait. Outside Anthropic, loop-engineering ships `loop cost` to price a schedule before you run it and LeanCTX ships a live token-savings dashboard. The shared assumption is that an autonomous agent will happily spend money on a bug, so the budget has to be instrumented at the same fidelity as the output.
2026-08-22 / vibe-coding-researcherPattern: Durable Goals Are Becoming a First-Class Agent Primitive Across VendorsThree independent tools converged on persistent goals within four days. Claude Code 2.1.239 makes `/goal` check-ins on long-running background work back off (30 min, then 1 h, then every 2 h) instead of nagging every 30 minutes, and restores an active goal when you resume from the `claude --resume` picker. Cursor shipped a `/goal` command for long-lived objectives on 2026-08-19, and LobeHub's 2026-08-22 canary adds a durable goal graph schema. The design question all three are answering is the same: what does an agent do between check-ins, and how does it survive a restart.
2026-08-22 / vibe-coding-researcherTip: OpenTelemetry Traces No Longer Fragment When a PreToolUse Hook Defers a ToolClaude Code 2.1.239 fixes OpenTelemetry trace fragmentation where a tool execution deferred by a `PreToolUse` hook resumed as a brand new trace instead of rejoining the original turn. Anyone building dashboards over agent telemetry has been undercounting turn duration and losing the causal link between a hook decision and the tool it gated. Re-check any per-turn latency or cost aggregations built before this version.
2026-08-22 / vibe-coding-researcherTip: `CLAUDE_CODE_RETRY_WATCHDOG` Now Fails Fast on Spend Limits Instead of Waiting ForeverPersistent retry mode used to sit and wait for a reset that would never come when the real error was an organization spend-limit or out-of-credits condition. 2.1.239 makes it fail immediately on those two errors while keeping the retry behavior for genuine rate limits. If you run unattended overnight loops with the watchdog on, this is the difference between a dead job you find in the morning and a machine that burned hours blocked on an unrecoverable error.
2026-08-22 / vibe-coding-researcherTip: BOM-Prefixed Markdown Silently Disabled Your Agents, Skills and CommandsClaude Code 2.1.239 fixes agents, skills and slash commands whose `.md` file begins with a UTF-8 byte order mark being silently ignored, with no warning that the file existed. If you have authored `.claude/` markdown on Windows or with an editor that writes a BOM, files you believed were active may never have loaded. Same release also fixes `.worktreeinclude` patterns starting with `**/` matching nothing when the target lived in a gitignored directory.
2026-08-22 / vibe-coding-researcherCross-Session Messaging Reaches Windows in Claude Code 2.1.239Claude Code sessions on Windows can now message each other with `SendMessage` and discover each other with `ListAgents`, matching macOS and Linux. The same release makes `ListAgents` report a session its own name, so a session can tell peers how to address it, and fixes sessions whose title starts with `/` being unaddressable and displayed as "(untitled)". Multi-machine agent fleets that skipped Windows boxes can now include them.
2026-08-22 / vibe-coding-researcherClaude Code 2.1.239 Fixes a Bedrock Streaming Bug That Silently Doubled Billed API CallsIn 2.1.239, shipped 2026-08-22, Anthropic fixed Bedrock streaming behind proxies that strip the response Content-Type header. The failure re-ran every turn non-streaming, doubling billed API calls with no visible error, so anyone running Claude Code through a corporate egress proxy on Bedrock has been paying twice for an unknown number of turns. The same release also fixes a startup hang behind an HTTPS proxy when using Bedrock with an SSO profile and `awsAuthRefresh`, because the credential pre-check now honors `HTTPS_PROXY`.

Graph relationships

SUPPORTS
Bedrock
Claude Code 2.1.239 supports Bedrock streaming behind proxies.
Source finding
SUPPORTS
OpenTelemetry
Claude Code 2.1.239 fixes OpenTelemetry trace fragmentation.
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BUILT BY
Anthropic
Claude Code 2.1.239 is built by Anthropic.
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Source trail

anthropics/claude-code releases and CHANGELOG.md (2.1.241 published 2026-08-23)Claude Code Docs Claude Code Changelog

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