Meta's Muse Agent Drives 11% Stock Rally, Then Rolls Back Undisclosed Human-Concierge Feature

Meta's Muse agent became the market's newest AI story, driving an 11%-plus stock rally as investors reframed the company as an agent play. Muse reached 448,000 daily active users and 264,000 daily downloads, offering task automation — sending emails, booking travel, filling forms, and placing phone calls — powered by the Muse Spark model across $20 and $100 monthly tiers. Reuters framed Wall Street's expectation that Muse becomes 'a new revenue engine.'

The episode turned when Meta rolled back an undisclosed 'human concierge' feature in which human contractors quietly handled some Muse phone calls. After internal transparency feedback, Meta pulled it, but the revelation landed as a credibility problem: users had believed they were interacting with an autonomous agent. Community reaction flagged it as a trust breach, compounded by a reported zero-day vulnerability in which one user allegedly extracted 6.8GB of filesystem data.

Competitively, Muse Spark scores 61-62 on the Artificial Analysis Intelligence Index — trailing Claude Fable 5.1 at 66 — so Meta's traction is being driven by product distribution and consumer reach rather than raw model leadership. That fits a broader week-long theme of Meta's shaky open-model position (Llama losing ground, Muse Spark switching to closed weights). The human-concierge episode also echoes long-running skepticism about 'AI' products quietly backstopped by human labor. Watch whether the DAU momentum survives the transparency hit and the security scrutiny — and whether Meta Connect 2026 delivers a genuine Llama and Muse capability leap to justify the rally.