Vibe CodingARC-AGI-2 Breaks 50% — Recursive Sub-Agent Delegation WinsSymbolica·high signalXBlueskyLinkedInCopy linkPoetiq 54% via iterative refinement loops. Symbolica Agentica 85.28% with recursive delegation averaging 2.6 agents/task, max 9 depth.SourceSource pageSymbolica↳ Follow the threadShared entity / Stack layerMeta^n Escapes the Depth-2 Ceiling of Self-Improving Agents by Freezing the Meta-Operation and Recursing on Its InputarXiv 2608.24735Policy dependency / Stack layerWebMCP-Phalanx blocks all 80 tool-description injections in a browser agent, then gets bypassed by a malicious tool name called before inspectionarXivPolicy dependency / Threat patternmcp-shell Ships Security Off in One Deploy Path and Bypassable in the Other (CVE-2026-55580/55581/55582)GitHub Security AdvisoriesStack layer / Threat patternCROSS-CATEGORY: The Guardrail Layer Around Coding Agents Shipped at Four Different Points in the Lifecycle in 48 HoursHacker News Show HN and Product Hunt (2026-08-24 and 2026-08-25)Stack layerMobilePA-Bench Tests On-Device Agents on 212 Real Mobile Tools With Live Application DatabasesarXiv 2608.23035Stack layerClaude Code 2.1.243 adds a Loops breakdown to /usage and splits prompt-cache TTL between the main conversation and subagentsClaude Code changelogStack layerFabien Sanglard published the agent.md he tuned until LLM output matched his hand-written codeFabien Sanglard (via Hacker News)Policy dependency / Stack layerAttnlocate treats prompt injection as an object detection problem inside the attention matrix, hitting 0.934 TPR at 0.067 FPRarXiv