Meta AI

By Meta. No UTM value documented yet.

What works today

Muse reads an A2A agent card when it finds one. When it found ours, it messaged us and introduced itself as an AI browser agent acting for a researcher.

As of 2026-10-30.

Rows are tests, columns are surfaces. Select a cell to see each link location, the date, the method and the evidence. Reported means a third-party report we have not yet verified first-hand. See how we test.

Test
muse.ai web
iOS app
Android app
macOS app
Muse in WhatsApp
REF-01 Referrer present

Partial (2026-11-02)

  • Inline citation in an answer: Partial · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ document.referrer: https://l.meta.ai/ Landing URL: https://attribution.now/t/ref-01/meta-ai/web/inline-citation No inline citation markers exist; this is the cited source in the answer's "Sources:" list. The referrer is Meta's link shim, not muse.ai, so it names Meta but not Muse and is not on the usual AI-referrer lists. Data
  • Link or URL written in answer text: Partial · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ document.referrer: https://l.meta.ai/ Landing URL: https://attribution.now/t/ref-01/meta-ai/web/bare-url The URL Muse wrote rendered as a link preview card (title + og:image); clicked the card. Data
  • Link the user pasted, echoed back: Partial · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ document.referrer: https://l.meta.ai/ Landing URL: https://attribution.now/t/ref-01/meta-ai/web/pasted-link Clicked the link Muse echoed back as plain text links. Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Missing (2026-11-02)

  • Inline citation in an answer: Missing · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Referer: (none) document.referrer: (none) Landing URL: https://attribution.now/t/ref-01/meta-ai/macos/inline-citation Clicked the attribution.now link in the answer's sources; opened in Chrome with Sec-Fetch-Site none. Data
  • Sources / citations panel: Untested.
  • Link or URL written in answer text: Missing · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Referer: (none) document.referrer: (none) Landing URL: https://attribution.now/t/ref-01/meta-ai/macos/bare-url Opened in Chrome with Sec-Fetch-Site none. Data
  • Link the user pasted, echoed back: Missing · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Referer: (none) document.referrer: (none) Landing URL: https://attribution.now/t/ref-01/meta-ai/macos/pasted-link Clicked the link Muse echoed back; opened in Chrome with Sec-Fetch-Site none. Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.
REF-02 No full-URL leak

Works (2026-11-02)

  • Inline citation in an answer: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Origin only; no thread path or ID. Data
  • Link or URL written in answer text: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Origin only. Data
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Origin only. Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

n/a (2026-11-02)

  • Inline citation in an answer: n/a · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. No referrer is sent, so nothing can leak. Data
  • Sources / citations panel: Untested.
  • Link or URL written in answer text: n/a · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. No referrer is sent. Data
  • Link the user pasted, echoed back: n/a · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. No referrer is sent. Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.
REF-03 Link markup (web only)

Missing (2026-11-02)

  • Inline citation in an answer: Missing · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Link is l.meta.ai/?u=…&h=… with rel="noopener noreferrer". The noreferrer is offset by the shim, which sends its own origin. Data
  • Link or URL written in answer text: Missing · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Card link is l.meta.ai/?u=…&h=… with rel="noopener noreferrer". Data
  • Link the user pasted, echoed back: Missing · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Echoed links (and links in the user's own message) are l.meta.ai shim links with rel="noopener noreferrer". Data
n/a
n/a
n/a
n/a
UTM-01 UTM present

Missing (2026-11-02)

  • Inline citation in an answer: Missing · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Landing URL: https://attribution.now/t/ref-01/meta-ai/web/inline-citation No utm_* parameter in the shim's u= target or on the landing URL. Data
  • Link or URL written in answer text: Missing · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Landing URL: https://attribution.now/t/ref-01/meta-ai/web/bare-url No utm_* parameter. Data
  • Link the user pasted, echoed back: Missing · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. No utm_* parameter on any echoed link. Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Missing (2026-11-02)

  • Inline citation in an answer: Missing · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Landing URL: https://attribution.now/t/ref-01/meta-ai/macos/inline-citation No utm_* parameter on the landing URL. Data
  • Sources / citations panel: Untested.
  • Link or URL written in answer text: Missing · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Landing URL: https://attribution.now/t/ref-01/meta-ai/macos/bare-url No utm_* parameter. Data
  • Link the user pasted, echoed back: Missing · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. No utm_* parameter on any echoed link. Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.
MRG-01 Keeps existing query

Works (2026-11-02)

  • Inline citation in an answer, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Landing URL: https://attribution.now/t/mrg-01/meta-ai/web/pasted-link?a=1&b=2 ?a=1&b=2 arrived intact through the shim (no tag is added). Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Works (2026-11-02)

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Landing URL: https://attribution.now/t/mrg-01/meta-ai/macos/pasted-link?a=1&b=2 ?a=1&b=2 arrived intact (no tag is added). Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.
MRG-02 Keeps fragment

Works (2026-11-02)

  • Inline citation in an answer, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Landing URL: https://attribution.now/t/mrg-02/meta-ai/web/pasted-link#section-2 #section-2 survived the shim (it is URL-encoded inside u=). Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Works (2026-11-02)

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Landing URL: https://attribution.now/t/mrg-02/meta-ai/macos/pasted-link#section-2 #section-2 reached the page (no tag is added). Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.
MRG-03 No overwrite

Works (2026-11-02)

  • Inline citation in an answer, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Landing URL: https://attribution.now/t/mrg-03/meta-ai/web/pasted-link?utm_source=newsletter&utm_medium=email utm_source=newsletter kept (no tag is added). Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Works (2026-11-02)

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Landing URL: https://attribution.now/t/mrg-03/meta-ai/macos/pasted-link?utm_source=newsletter&utm_medium=email utm_source=newsletter kept (no tag is added). Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.
MRG-04 Signed URLs untouched

Works (2026-11-02)

  • Inline citation in an answer, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Chrome 156.0.8078.80 / macOS 27.2. Referer: https://l.meta.ai/ Landing URL: https://attribution.now/t/mrg-04/meta-ai/web/pasted-link?expires=2099-01-01&signature=abc123 Signed URL arrived byte-identical through the shim. Data

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Untested

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Works (2026-11-02)

  • Inline citation in an answer, Sources / citations panel, Link or URL written in answer text: Untested.
  • Link the user pasted, echoed back: Works · 2026-11-02 · Verified (manual) · Muse 10.1 (macOS app) → Chrome 156 / macOS 27.2. Landing URL: https://attribution.now/t/mrg-04/meta-ai/macos/pasted-link?expires=2099-01-01&signature=abc123 Signed URL arrived byte-identical. Data

Untested

  • Link or URL written in answer text, Link the user pasted, echoed back: Untested.

Lab-wide

Test
All surfaces
UTM-02 UTM consistent
Untested
UTM-03 UTM documented
Untested
OPS-01 Changelog
Untested

Next improvements

No open improvements. Thank you.

Personal agent: Meta Muse

Muse runs errands for one person: it books travel, fills forms and checks out, in a dedicated cloud machine with its own browser. Launched September 8, 2026 (source).

It browses your site in a browser of its own, so its visits run your pages and your analytics tag like a person's. See Detect personal agent traffic for how to label and report them.

Signal
Meta Muse

Names itself

A name in the user agent. Easy to read, but anyone can copy it.

Missing (2026-10-30)

  • Meta Muse: Missing · 2026-10-30 · Verified (manual). User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Safari/537.36, no name. 13 runs from October 29 to 30. Data

Signs its requests

A Web Bot Auth signature a site can verify.

Missing (2026-10-30)

  • Meta Muse: Missing · 2026-10-30 · Verified (manual). No Signature-Agent or Signature header in 13 runs. Data

Tags its visits

A utm_source on the first page, so the visit has a source.

Untested

How to recognize it today

Only by inference. Muse claims Linux x86_64 and sends only the "Chromium" brand in Sec-CH-UA, where Chrome also sends "Google Chrome". It comes from Cloudflare's network and renders with a software GPU on an ARM processor.

Shipped

Nothing recorded yet.

Full history on the changelog.

Last verified: 2026-11-02. Last checked: 2026-11-02.

Work on Meta AI and see something out of date? Request a review and we will update the entry.