AI Agents via Text Messaging

A growing ecosystem of AI agents now lives directly in SMS and messaging platforms, representing a major evolution in how people interact with artificial intelligence ^[1]. iMessage has become especially crowded: a directory called the Agent Store now lists 144 agents living inside iMessage alone ^[2]. Caddy, founded by former Loom product and design leads Rajiv Sancheti and Connor Waslo and backed by Y Combinator, has been in public beta on iMessage and RCS since April 2026 ^[3][4]. Comma takes a lighter-weight approach - a free, open-source assistant that works across a user's browser, computer, and files while remaining reachable through Signal, Telegram, and WeChat ^[1]. None of this would scale without infrastructure: Photon's Spectrum SDK gives developers one interface to deploy agents across iMessage, RCS, SMS, and WhatsApp, and has already attracted more than a million end users and 500 paying customers with under 3 percent churn ^[5].

Nowhere is investor appetite clearer than in Instinct, built by Spear Street Technology under founder Noah Shinn. The company raised $350 million at a $2.5 billion valuation in August 2026, then jumped to $1 billion at a $10 billion valuation just a month later in September ^[6][7]. That capital is funding some of the category's most aggressive autonomy features: Instinct now issues its agents dedicated email addresses so they can create accounts, contact businesses, and follow up on requests without filling a user's personal inbox, and it has begun rolling out the ability to place phone calls on a user's behalf ^[7]. Family coordination is drawing separate but sizable bets: Fambot, founded by Uber and Instagram alumni David Reich, Greg Karlin, and Jason Morrow, launched publicly on September 1, 2026 with more than 1,000 families already using the service and $3.5 million in pre-seed funding ^[8]. Meanwhile Poke - launched in March 2026 after a $15 million seed plus a $10 million round at a $300 million valuation - was acquired by Cognition, the maker of Devin, in July 2026 for what was described as 'low nine figures,' with Cognition explicitly buying Poke's conversational personality rather than just its technology ^[9].

While startups compete on personality and autonomy, the largest distribution gains are coming from the platforms themselves. Meta's Business Agent for WhatsApp, launched globally in June 2026, lets businesses auto-answer questions, recommend products, book appointments, and escalate to a human - and more than one million businesses had already activated one across WhatsApp, Messenger, and Instagram, a base handling over one billion business conversation threads per day ^[10]. Google is pursuing the same path through the messaging protocol layer rather than a dedicated app, building Gemini directly into Google Messages over RCS; the integration already serves AI responses in 165 countries, though not yet in the European Union ^[11]. These protocol-level moves matter because they reach users who never seek out a standalone agent app - the agent simply shows up inside the thread they already use.

As autonomy expands, so does scrutiny. Instinct's agent-owned email addresses and phone-calling features have 'raised concerns about privacy and security,' and an early version of its privacy policy drew criticism before being updated ^[1][6]. A separate platform risk applies to szn, an iMessage agent from former Apple Siri engineer Nikhil Gupta that gives each customer a dedicated model and a named assistant with its own email and phone number - but it operates inside iMessage without official Apple sanction, and Apple has previously blocked unofficial iMessage integrations ^[13]. Against that backdrop, several entrants are competing on restraint rather than reach: Ollie, backed by Khosla Ventures, is SOC 2 compliant and built on a subscription model explicitly framed as an alternative to data harvesting ^[12]; and an October roundup highlighted two newer counter-positioned entrants, Underdog, an invite-only beta that runs on-device, is free, and carries no advertising, and Tab, which emerged from stealth at a $300 million valuation ^[1]. The split suggests the category hasn't settled on one business model - subscription, platform bundling, and ad-free on-device processing are all being tested at once.

Community reaction splits along two lines. On YouTube, explainers covering Instinct's jump from a $2.5 billion to a $10 billion valuation foreground the same autonomy push drawing scrutiny elsewhere - specifically the mechanics of letting one person's assistant act on someone else's behalf - and treat trust and data controls as a first-class concern rather than an afterthought. A separate video tracing Poke's origin story (it began as an email summarizer before users started texting it for homework help) highlights an unusual growth mechanic: a chatbot 'bouncer' that let early users negotiate their own membership price instead of joining a waitlist. On Reddit, sentiment runs more skeptical. An AMA for a similar iMessage assistant drew pointed questions about whether the economics work at all, given the combined weight of inference costs and per-message carrier fees, alongside a reported incident of one user's information leaking to someone else. A separate comparison thread across several messaging agents argued that the real dividing line in the category isn't personality or price - it's whether a tool actually completes a task end-to-end or simply hands back a draft for the user to finish. Taken together, the community conversation treats delegation of real-world authority - sending money, emailing on someone's behalf, acting for a family member - as the feature most likely to determine which of these agents earns lasting trust, not just an installed base. On X, coverage has stayed largely promotional and press-driven, with one notable exception: a separate wave of attention around business-facing brand agents going live inside Apple's own Messages for Business channel, a reminder that the personal-agent trend documented here is running parallel to a distinct B2B messaging-agent push.