Content Quality: Clear News structure (Overview, What We Know, Security Model, What We Do not Know, Analysis), 612 words, within the 400-1200 News range. Third-party example mods and any on-by-default claim are absent, as intended.
Source Verification: Read all three snapshots from disk (gunzip, text-extracted). source-0.html.gz (claude.com/blog/claude-code-mods, dated October 1, 2026): confirms mods are small TypeScript functions; rewrite a prompt, add UI, replace a built-in feature; ship inside plugins; work in CLI and desktop app; hook events; rewrite a prompt, block/rewrite/retry a tool call, approve or deny a permission request, redact secrets from tool output; sequential order with first-loaded seeing the event first and the result last; /diff is now a mod; sec-default; CI/CD, production safeguards, audit logging examples. The exact sentence quoted in the article is present: 'Mods run with the same access to your machine as Claude Code itself. They aren't sandboxed, and you should only install mods from sources you trust, the same way you'd install any code on your computer.' (snapshot uses a curly apostrophe). The article attributes this to Anthropic in both summary and body; it is not presented as a security finding. The title phrase 'Run Unsandboxed' is a compressed form of Anthropic's own 'aren't sandboxed' / 'same access to your machine' statement and is backed by it. source-1.html.gz (raw README): confirms four mods (sec-default, diff, telemetry, agents-md), the diff and agents-md descriptions, 'adds no policy of its own', 'claude plugin test mods/diff', 'published as it is built into the binary', and the verbatim Early access sentence. source-2.html.gz (code.claude.com/docs/en/changelog, 895k chars of text): contains 2.1.288 (October 2, 2026) with the $.ui.selection() entry and 2.1.287 (October 1, 2026) with 'Added Claude Mods: plugins may now modify deeper behavior' and the You should know built-in mod with '/plugin enable cc-plugin-you-should-know@builtin (for first-party sessions with telemetry on)'. Versions and dates match the article. Two imprecisions found: (1) the article says sec-default loads 'on Team and Enterprise plans with managed settings', but the announcement says 'On Team and Enterprise plans, and on any machine with managed settings' (either condition, not both), and presents preventing deny-rule overrides as its purpose where the announcement gives it as an example ('like overriding your permission deny rules'); (2) the article says mods can be installed 'from the Claude directory with the /plugin command' where the source gives two routes, 'from the Claude directory or by running /plugin in the CLI'. Both are filed as clarifications. Nothing in the sources states that mods are on by default, and the article does not claim it.
Factual Accuracy: Headline, summary, lead, capability list, delivery mechanism, version numbers and dates all trace to the snapshots. The Security Model section reports Anthropic documentation and quotes it verbatim; the closing Analysis paragraph is labelled as analysis and its inference (policy-enforcement point and possible risk) follows from the cited statements. The What We Do not Know claim that the sources do not describe directory vetting is accurate: the announcement says only to submit to the directory.
Overall Assessment: Solid, well-sourced first-party product coverage. Verified verbatim on every load-bearing claim; two minor clarifications published alongside.