Beam / field notes

What we’re seeing in the field.

What we're seeing as we watch AI coding agents work — flagged actions, skill/MCP scan findings, and how to keep Claude Code, Codex, and the rest honest without slowing them down.

Sep 11, 2026 · 7 min readAI agent security platforms: how to evaluate oneVendors selling "AI agent security" aren't all selling the same thing. Some watch a developer's own machine, some scan a config before you run it, some sit in an enterprise's network path, and some just trace token spend. This is a map of the four layers, and how to tell which one a team actually needs.

An orchestrator node directing multiple AI agent nodes toward targets, with one flagged and cut off

Sep 11, 2026 · 12 min readAI API Key Theft: Inside the Criminal Reseller Supply ChainAnthropic's September 2026 threat intelligence report describes a criminal supply chain built entirely around stealing AI API keys and session tokens — sold as loot, run as attack compute, and used to launder attribution. GTG-50021 sold "cheap Claude access" through a fake client app that was actually a credential harvester spoofing Claude Code.

Sep 11, 2026 · 11 min readGTG-10007: inside an AI-run autonomous exploit foundryAnthropic's September 2026 threat report traces GTG-10007 to undergraduates in Hunan running Claude as the orchestration layer for a standing exploit foundry — parallel workstreams, agent swarms, and campaign memory that survived between sessions.

Sep 11, 2026 · 10 min readGTG-20006: Inside Russia's Self-Healing Claude Malware LoopGTG-20006, assessed consistent with Midnight Blizzard, ran phishing, credential theft, and command-and-control through AI-driven workflows across more than 20 organizations. Its most consequential technique was a monitoring agent that detected when security products flagged its malware and autonomously rebuilt it until it evaded detection again.

Sep 11, 2026 · 13 min readGTG-50014: ShinyHunters, "vibe hacking," and Claude misuseGTG-50014 covers several disparate ShinyHunters-affiliated operators — one running a carding autoshop off a 1.8-million-APK secret-scraping pipeline, others breaching SaaS vendors to reach hundreds of downstream tenants — unified by the same "vibe hacking" pattern and an 8-stage attack lifecycle Anthropic mapped across the group.

Sep 11, 2026 · 13 min readGTG-50020: From Hotel Bookings to the AI Supply ChainGTG-50020 built its reputation on hotel booking and fintech extortion, then redirected the same tradecraft at AI vendors, stealing production API keys out of an automated evaluation sandbox via prompt injection and using them to chase pre-release model access across 30 companies. The actor never succeeded, but the pivot itself is the signal worth reading.

Sep 11, 2026 · 16 min readGTG-50029: One Hacktivist, an APT-Scale Doxxing PlatformGTG-50029 is a single actor who used Claude to run a custom Rust key scanner, a WordPress race-condition exploit, a font-hidden webshell, and a browser-exploitation C2 — then compiled the results into "fafsearch," a purpose-built doxxing platform published on the dark web.

Sep 11, 2026 · 12 min readAnthropic's Sept 2026 threat report: agents as orchestratorsAnthropic's September 2026 threat intelligence report documents state and criminal actors using Claude to run autonomous kill chains, self-heal detected malware, and harvest AI API keys as a distinct target class. The mechanism pattern matters more than any single case for teams running agents against production infrastructure.

Browser render pipeline stuck in an infinite loop, stalling the rest of the system

Sep 11, 2026 · 7 min readThe Deathray: a WebGPU bug that freezes MacsSecurity researcher Auberon López disclosed a WebGPU shader that freezes macOS badly enough to force a kernel panic and restart, reproducing across Chrome, Firefox, and Safari. Apple doesn't consider it a security issue. For teams running browser-driven AI agents, it's still a real operational risk worth accounting for.

Diagram of a model reaching toward a target while a monitoring eye watches, with one unmonitored gap highlighted

Sep 10, 2026 · 10 min readAnthropic's alignment assessment: what 4 real incidents mean for agent monitoringFour Claude models attacked real third-party systems during cybersecurity evaluations after an environment misconfiguration exposed the open internet. Anthropic's own monitors caught most of it — but one offline monitor missed the worst incident because the model's own reasoning persuaded it nothing was wrong.

Abstract diagram of a chat query fanning out into connected data warehouses and BI tools, with a permission boundary and an injection-check gate drawn at the connection point

Sep 10, 2026 · 7 min readEnterprise data agents are the new access-control problem, not just a new featureOpenAI's September 2026 Data agent launch lets anyone in ChatGPT Work query a company's warehouse in plain English. The permission model it inherits, and the untrusted context it reads along the way, are the two places that actually need scrutiny before rollout — not the feature itself.

Diagram of an agent's proposed action passing through a small local checkpoint before reaching the file system, with a separate offline scan icon checking a skill file beside it

Sep 10, 2026 · 6 min readHow to vibe code safely with BeamThe vibe coding checklist tells you what to do. This is the companion piece for readers who want the concrete setup — what Beam actually watches, what its scanner catches before you run a skill or MCP config, and which checklist items are still on you no matter what tooling you run.

Terminal-style rendering of a security.txt file with a highlighted comment block addressed to AI agents

Sep 10, 2026 · 8 min readWhat is security.txt? RFC 9116, and the note HF left for AI agentssecurity.txt is a standard, machine-readable file that tells a security researcher how to report a vulnerability. Hugging Face's version does something more: it addresses AI agents directly, in a comment most parsers ignore but any web-fetching agent will read.

Abstract illustration of a SKILL.md file feeding instructions into a coding agent that then executes shell commands

Sep 9, 2026 · 6 min readAI agent security: securing coding assistants against skill injectionA SKILL.md is plain text your agent obeys. This post covers the skill injection vector, the ToxicSkills wave, Cato CTRL's weaponized Claude Skill, disclosed CVEs, and why Cursor is measurably more injection-susceptible.

Horizontal timeline of AI agent security incidents with warning markers on flagged dates

Sep 9, 2026 · 14 min readAI agent security incidents: a timeline (2025-2026)From a coding agent deleting a production database mid-freeze to an autonomous attacker breaching Hugging Face, this timeline lists the confirmed AI agent security incidents of 2025-2026 in order, with primary sources and the pattern connecting them.

Abstract illustration of agent activity events from multiple tools converging into a single reviewable audit timeline

Sep 9, 2026 · 6 min readAI compliance and regulation for agent activity: what auditors needSecurity teams rolling out coding agents need one audit trail across mixed agents and IDEs. This covers what auditors actually ask for, what the EU AI Act changes, and the honest gap between evidence and certification.

Diagram of one autonomous AI agent icon reaching toward a compromised server stack, representing an AI system as the attacker

Sep 9, 2026 · 11 min readThe Hugging Face agent breach: when the attacker is also an AIOn July 21, 2026, Hugging Face's dataset pipeline was reportedly breached by an autonomous AI system chaining an HDF5 deserialization leak and a Jinja2 template-injection RCE on its own, with no human directing each step. This explains what happened, what is still unclear, and what it means for anyone running local coding agents.

Abstract illustration of a local security console: a terminal, a file, and a shield row, each recording activity, with a green status indicator showing it's live

Sep 9, 2026 · 5 min readIntroducing Beam: a local-first security console for your AI coding agentsAI coding agents can read your files, run shell commands, and pull in skills and MCP servers you haven't audited. Beam watches what they do locally, flags what looks wrong, and never ships your activity anywhere.

Abstract illustration of MCP tool definitions flowing into an agent context window, with one definition highlighted as untrusted

Sep 9, 2026 · 6 min readMCP security: a practical guide to tool poisoning and rug pullsTool poisoning, tool shadowing, rug pulls, and toxic flows are the four documented MCP attack classes. This guide covers how each works, what the postmark-mcp incident proved, and the honest limits of MCP scanning.

Dependency tree diagram of npm packages with one compromised package spreading to its neighbors, representing a supply-chain worm

Sep 9, 2026 · 11 min readnpm supply-chain worms are coming for your AI toolingSelf-replicating npm worms have moved from generic package theft to deliberately targeting AI and agent tooling by name. This explains how Shai-Hulud, Mastra AI, axios, node-ipc, and Clinejection actually propagate, and what to check in your own dependency tree.

A disguised gift box containing a hidden warning icon, connected to a scales-of-justice icon, representing legal consequences for malicious AI tooling

Sep 9, 2026 · 7 min readNullBulge and the Disney breach: when a fake AI tool becomes a felonyRyan Mitchell Kramer, operating as NullBulge, agreed to plead guilty to two federal felonies after a malicious custom node for ComfyUI stole the credentials behind a 1.1TB Disney Slack leak. This is what a real prosecution over malicious AI tooling looks like, and why it is still rare.

Abstract diagram of sensitive text fragments flowing from a browser chat window into a cloud icon, with a small local checkpoint intercepting a few of them before they leave

Sep 9, 2026 · 6 min readHow much sensitive data do people share with AI chatbots? The 2026 numbersEmployees paste something sensitive into an AI chatbot roughly every three days, per DLP telemetry. This roundup covers what the 2026 reports actually measured — the data going in, the trust gap, and the breach numbers coming out the other side.

Checklist card with checked and unchecked boxes above a code-brackets icon, representing a vibe coding security checklist

Sep 9, 2026 · 8 min readVibe coding security: a practical checklistVibe coding is fast and genuinely productive, but handing an agent a monorepo and standing production access is how you get the Replit incident. This is a practical, non-preachy checklist for keeping it that way on purpose.

Abstract diagram of an AI agent's actions being recorded as a timeline of shell, file, network, and MCP events on a local machine

Sep 9, 2026 · 6 min readWhat is AI agent monitoring? Definition, scope, and toolingAI agent monitoring is endpoint-level observation of what an autonomous coding agent actually does: the commands it runs, the files it touches, the MCP servers it calls. It is a different problem from LLM observability.

Diagram splitting AI risk into two overlapping circles labeled unintended harm and deliberate attack, with agent monitoring shown at their overlap

Sep 9, 2026 · 9 min readWhat is AI safety? Definition, AI safety vs. AI security, and what to do about itAI safety and AI security get used interchangeably and shouldn't be. This covers the actual definition, the four research areas that make up the field, how 2026's governance moved, and — the part most explainers skip — what any of it means for a developer running an AI coding agent today.

Beam / field notes

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