Startup
Ellipsis
Managed agent platform: pick the harness, model and tools; Ellipsis runs it
Ellipsis runs coding agents on its own infrastructure and handles VMs, permissions, budgets and logs. Agents are defined in YAML: trigger, harness and model, prompt, repos, hooks, compute and spend limits. Supported harnesses include Claude Code, Codex, OpenCode, Gemini CLI, GitHub Copilot and Cursor. Use cases are software factories, code review and background agents. The company is backed by Y Combinator.
Neighbours in the directory
San Francisco, CA · Est. 2022
The de-facto standard toolkit for building LLM applications and agents.
LangChain makes the LangChain framework and LangGraph, the low-level orchestration standard for stateful, controllable agents, plus the LangSmith platform for tracing, evaluating and monitoring them in production.
~$75M raised
San Francisco, CA · Est. 2023
Devin, the AI software engineer, and the Windsurf IDE.
Cognition builds Devin, an autonomous AI software engineer that plans and executes engineering tasks end-to-end, and acquired the Windsurf agentic IDE in 2025. One of the defining startups of the coding-agent wave.
~$10.2B valuation (Sep 2025)
San Francisco, CA · Est. 2023
Conversational AI agents for customer experience.
Sierra, co-founded by Bret Taylor and Clay Bavor, builds production conversational agents that resolve real customer issues with guardrails, evaluation and human escalation — a template for deploying vertical agents at the enterprise edge.
~$10B valuation (Oct 2025)
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
Built on · 3
- Claude CodeProject
- CodexProject
- Gemini CLIProject
Sources
Verified Oct 29, 2026