--- collection: coding-agents collection_name: Coding Agents week_start: 2026-09-07 title: Claude Code finds its footing as agent platforms grow up release_count: 16 generated: 2026-09-14 canonical: https://releases.sh/collections/coding-agents/digest/2026-09-07 --- # Claude Code finds its footing as agent platforms grow up Anthropic shipped seven Claude Code releases in a week bookended by regression fixes, while Cursor launched Projects — a coordinator agent that plans work, delegates to parallel cloud subagents, and keeps context over months. ### Agents that plan, delegate, and stay on call The week's biggest swing came from [Cursor's new Projects surface](/release/rel_NXxwmHxZ7vXoY3yPmlCkh-cursor-launches-projects-with-cloud-coordinator-agents-and-shared-context), which puts a coordinator agent in the left-hand nav and lets it plan a body of work, farm it out to thousands of parallel subagents on cloud machines, and hand back finished results for review. Shared context files sync across cloud and local machines, and subscriptions let the coordinator respond to Slack channels, schedules, or pull requests without a human prompt. It's a clear bet that the unit of software work is shifting from "a session" to "a standing project." Cognition pushed Devin in the same direction, less from ambition than from operational reality. The [September release](/release/rel_R3E6R0pO7Qpg21TseB5Fj-devin-september-2026-release-adds-plugins-closes-child-prs-on-archive) adds plugins that bundle skills, rules, hooks, and MCP servers into one installable package with security notices on every install, and archiving a session now closes the open PRs of child sessions archived with it — exactly the kind of hygiene you need once agents spawn agents. A few days later, [PagerDuty oncall integration and 21 zero-config OAuth MCP servers](/release/rel_RfA8JB38SN2EW9HlNBUEX-devin-adds-pagerduty-oncall-integration-and-21-zero-config-oauth-mcp-servers) arrived, letting Devin act as an oncall responder that triages incidents and posts investigation notes, plus an idempotency_key on the v1 Sessions API that returns the original session on repeat calls. ### A hard week of hardening in Claude Code Claude Code's release cadence dominated the week, and the story was less about features than about surviving its own velocity. A [gateway sign-in regression](/release/rel_45IXy2TrPtNQdEJZFrqde-claude-code-v2-1-266-fixes-gateway-sign-in-regression-breaking-proxy-setups) capped off a bad run: the undocumented CLAUDE_CODE_USE_GATEWAY variable began forcing Cloud-gateway sign-in on its own, breaking every request for proxy and LLM-gateway setups using an API key or custom auth headers. Behind it came another fix for [HTTP 400 failures on third-party Anthropic-compatible endpoints](/release/rel_6ZRH2i6CV0d7Up8LiaCd5-claude-code-2-1-268-fixes-http-400-on-third-party-endpoints-and-webfetch-hangs) caused by a regex in the Artifact tool's input schema, plus a WebFetch hang and a busy loop pinning a CPU core. The recovery releases carried real substance too. [v2.1.265](/release/rel_yog93Z48kGhAKt5SKLSC2-claude-code-v2-1-265-adds-plugin-folders-fixes-subagent-resume-bugs) added `--plugin-dir` support for a whole folder of plugins and a 1 GB cap on tool results saved to disk, alongside fixes for prompt-cache reuse in resumed subagents. [v2.1.267](/release/rel_AfRurTQfcz1JD3wHLf2cL-claude-code-v2-1-267-adds-effort-caps-fixes-sandbox-bypass-and-session-resume) added a `maxEffortLevel` cap across every provider and patched a sandbox containment bypass for marketplace paths with backslashes. And [v2.1.269](/release/rel_TGkQfJi7pkUbEYAUfxqGq-claude-code-v2-1-269-adds-plugin-eval-suite-and-output-style-switching) introduced `claude plugin eval` for scored, reproducible plugin eval suites and `/output-style [name]` switching over Remote Control and headless sessions — the most substantial capability drop of the seven, though it needed [a follow-up](/release/rel_BF6DVMhFr7odsmtywGpK9-claude-code-v2-1-270-fixes-read-only-git-commands-prompting-for-permission) to stop read-only git commands from prompting for permission mid-session. ### Codex widens its surface OpenAI spent the week extending Codex rather than rebuilding it. [Codex 0.154.0](/release/rel_Wa8XzB5R8zg5-7sFSecaW-codex-0-154-0-adds-gpt-6-astra-and-experimental-worktrees) brought GPT-6-Astra to the model picker and Bedrock catalogs and added experimental worktrees for isolated checkouts via `--worktree`. The [Python SDK's 0.154.0](/release/rel_m2vuLSv2cWoquCDLHVPeF-openai-codex-python-sdk-0-154-0-adds-externalmessage-and-max-reasoning-effort) added ExternalMessage for sync and async runs, new max and ultra reasoning-effort values, and a breaking change wrapping hook handlers in `.root`. On mobile, [ChatGPT for iOS](/release/rel_7BTuuxemUJdBBa3YL96sz-codex-chatgpt-for-ios-adds-mentions-and-background-worktrees) gained @ mentions and background worktree setup with a Live Activity, while the [desktop app](/release/rel_f1sQz0ebnWxaf20pv0YfG-chatgpt-desktop-app-adds-quick-chat-with-pets-and-appshots-on-windows) brought Quick Chat to the floating Pets controls and Appshots to Windows. Smaller but useful: Grok Build fixed [headless prompt hangs](/release/rel_oef2T0Dkc-Or7R0RMIY54-grok-build-1-0-25-fixes-headless-prompt-hangs-and-cleanly-handles-session) and wrong-session resumption, then tidied its [session header and tmux pane lag](/release/rel_aZEb9R8O8AwcsLrUGx2rL-grok-build-1-0-30-updates-session-header-and-fixes-tmux-pane-lag). ## Releases covered ### Anthropic - [Claude Code v2.1.266 fixes gateway sign-in regression breaking proxy setups](https://releases.sh/release/rel_45IXy2TrPtNQdEJZFrqde-gateway-sign-in-regression-fixed-for-proxy-setups) - [Claude Code 2.1.268 fixes HTTP 400 on third-party endpoints and WebFetch hangs](https://releases.sh/release/rel_6ZRH2i6CV0d7Up8LiaCd5-third-party-endpoint-400s-fixed-webfetch-gets-300s-deadline) - [Claude Code v2.1.265 adds plugin folders, fixes subagent resume bugs](https://releases.sh/release/rel_yog93Z48kGhAKt5SKLSC2-plugin-folders-supported-subagent-resume-cache-fixed) - [Claude Code v2.1.267 adds effort caps, fixes sandbox bypass and session resume bugs](https://releases.sh/release/rel_AfRurTQfcz1JD3wHLf2cL-effort-caps-added-sandbox-containment-bypass-fixed) - [Claude Code v2.1.269 adds plugin eval suite and /output-style switching](https://releases.sh/release/rel_TGkQfJi7pkUbEYAUfxqGq-plugin-eval-suite-powershell-background-commands-survive-exit) - [Claude Code v2.1.270 fixes read-only git commands prompting for permission](https://releases.sh/release/rel_BF6DVMhFr7odsmtywGpK9-read-only-git-commands-no-longer-prompt-for-permission) ### Cognition - [Devin September 2026 release adds plugins, closes child PRs on archive](https://releases.sh/release/rel_R3E6R0pO7Qpg21TseB5Fj-session-prs-close-with-archive-plugins-bundle-devin-setup) - [Devin adds PagerDuty oncall integration and 21 zero-config OAuth MCP servers](https://releases.sh/release/rel_RfA8JB38SN2EW9HlNBUEX-pagerduty-oncall-triage-21-new-zero-config-mcp-servers) ### Cursor - [Cursor launches Projects with cloud coordinator agents and shared context](https://releases.sh/release/rel_NXxwmHxZ7vXoY3yPmlCkh-projects-coordinator-agents-cloud-machines-shared-context) ### OpenAI - [Codex 0.154.0 adds GPT-6-Astra and experimental worktrees](https://releases.sh/release/rel_Wa8XzB5R8zg5-7sFSecaW-gpt-6-astra-in-model-picker-worktrees-land) - [OpenAI Codex Python SDK 0.154.0 adds ExternalMessage and max reasoning effort](https://releases.sh/release/rel_m2vuLSv2cWoquCDLHVPeF-codex-sdk-adds-externalmessage-hookmetadata-now-wraps-handler-in-root) - [Codex ChatGPT for iOS adds @ mentions and background worktrees](https://releases.sh/release/rel_7BTuuxemUJdBBa3YL96sz-mentions-live-answers-background-worktrees-on-ios) - [ChatGPT desktop app adds Quick Chat with Pets and Appshots on Windows](https://releases.sh/release/rel_f1sQz0ebnWxaf20pv0YfG-quick-chat-from-pets-controls-appshots-land-on-windows) ### xAI - [Grok Build 1.0.25 fixes headless prompt hangs and cleanly handles session resumption](https://releases.sh/release/rel_oef2T0Dkc-Or7R0RMIY54-headless-prompts-time-out-session-resumption-no-longer-attaches-wrong-session) - [Grok Build 1.0.30 updates session header and fixes tmux pane lag](https://releases.sh/release/rel_aZEb9R8O8AwcsLrUGx2rL-session-header-single-row-tmux-pane-lag-fixed)