Principles of Building AI agents
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Every Harness Will Become A Claw — Sam Bhagwat, Mastra
AI Engineer· 2026-07-21 21:30
Industry Evolution and Agent Spectrum - The AI industry has evolved over the past 18 to 24 months, shifting from basic LLMs to advanced agents and harnesses [2][6][24] - The agentic spectrum transitions across different levels of autonomy, comparable to self-driving technology [6] - Local harnesses have been widely adopted for daily coding tasks, while cloud harnesses provide 24/7 always-on capabilities [3][4][13] Technical Capabilities and Architecture - Harnesses are characterized by high durability, doggedness, planning modes, and parallel sub-agents running for hours or days [8][9] - Cloud-based architectures utilize cloud sandboxes to enable greater resource allocation and advanced parallelism compared to local machines [15] - Advanced harness features include session-long tool approvals, automatic context window compaction, and dynamic skill generation [10][12][21] Market Trends and Future Outlook - The "Harness Era" represents a phase where every harness tends to expand into a claw through technological, economic, and psychological drivers [2][25] - Historical platform shifts, such as the emergence of Android and iOS in the 2010s, indicate that consumer brain space limits the long-term survival of multiple applications [28][30] - The industry anticipates a future shakeout phase in the late 2020s, requiring developers to ensure high economic value or high frequency of use for their AI agents [32][34][36]