Anthropic decides to support OpenAI's markdown instructions spec
This makes life easier for folks who use both platforms."We're adding support for AGENTS.md to Claude Code," said Claude Code engineer Thariq Shihipar in a social media post. "Starting today in version 2.1.277, if there is no CLAUDE.md in a folder, Claude will check for and use AGENTS.md."Claude Code users can toggle this behavior, he said, with the /config command. REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/c'); }); These documents get read by coding agents with every request.
- ▪This makes life easier for folks who use both platforms."We're adding support for AGENTS.md to Claude Code," said Claude Code engineer Thariq Shihipar in a social media post.
- ▪"Starting today in version 2.1.277, if there is no CLAUDE.md in a folder, Claude will check for and use AGENTS.md."Claude Code users can toggle this behavior, he said, with the /config command.
- ▪REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/c'); }); These documents get read by coding agents with every request.
2 outlets in our directory ran this story, first to last over 3 hours. All of the coverage we found sits in one bucket: centre. That one-sidedness is itself worth noticing.
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Story provenance
Source · retrieval · rights · ranking — open for full record
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | The Register |
| Canonical URL | https://www.theregister.com/ai-and-ml/2026/09/18/anthropic-decides-to-support-openais-markdown-instructions-spec/5297588 |
| Publication time | Fri, 18 Sep 2026 23:33:16 +0200 |
| Retrieval time | 2026-09-19T00:08:45.647Z |
| Last seen | 2026-09-19T00:08:45.647Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 9bxQ9bO6JzJh · 2 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); ai and ml Anthropic decides to support OpenAI's markdown instructions spec Devs cheer relief from compatibility headache Thomas Claburn Thomas Claburn AI AND SOFTWARE REPORTER Published fri 18 Sep 2026 // 22:33 UTC READ MORE Claude Code revamps projects so you can work and pay in parallel 2 hours ago Researchers used Claude to hack OpenAI employees' ChatGPT accounts 4 hours ago KDE turns 30 and someone's brought an AI-native desktop proposal 7 hours ago The ideal database for AI agents…
Excerpt limited to ~120 words for fair-use compliance. The full article is at The Register.
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