MarketsYC Spring 2026 RFS 6 of 7 Ideas AI-NativeY Combinator·high signalXBlueskyLinkedInCopy linkYC wants Cursor for PM, AI-native agencies (65-80% margins), AI-guided physical work. Not funding AI features — funding agent-first companies.SourceSource pageY Combinator↳ Follow the threadPolicy dependency / Stack layerCompose agent guardrails as an algebra instead of a rule list: 94.8% of policy-violating events intercepted while keeping 86.9% task completionarXiv 2608.16402Stack layer / ContrastCursor launches Origin, its own code hosting platform, putting repos, PRs and agents in one placeCursorPolicy dependency / Stack layerClaude Agent SDK for Python 0.2.140 adds MCP 2.x in-process servers and a structured ResultError instead of exit code 1GitHub (anthropics/claude-agent-sdk-python)Stack layer / ContrastOmniScientist Runs Ideation, Experimentation and Manuscript Writing Across 36 Real Cases and Wins 85% of Head-to-Head Comparisons Against a Features-Only BaselinearXiv (via HuggingFace Daily Papers)Stack layer / Contrast'Coherence Debt': Withheld Facts Make Coding Agents Fabricate Rather Than Stall, and Harnesses Differ Tenfold in Tokens for Identical ResultsarXiv 2608.16630Stack layer / Threat patternGuillermo Rauch: Vercel Ran Cybersecurity Evals on GLM 5.3 and Calls It 'the New Open Frontier' — Cheap Enough to Scan 3× More OftenX/TwitterStack layer / Contrastr/LocalLLaMA Asked Who Is Still Not on Full Auto, and 148 Comments Said Small Scoped Tasks Beat Autonomyr/LocalLLaMAStack layer / ContrastCopilotKit Ships OpenBot: 1,089 Stars in Three Days for AG-UI Agents That Each Get Their Own Browser and FilesGitHub