Hermes Agent: Agent Frameworks

Founded 2023|San Francisco, CA|11-50 people|Free open-source

What is Hermes Agent?

Hermes Agent is Nous Research's open-source autonomous AI agent with persistent memory — released February 2026 and the fastest-growing agent framework of 2026, hitting 95.6K GitHub stars in seven weeks. Unlike most agents that forget everything between sessions, Hermes maintains a curated memory of preferences, projects, environment, and lessons learned.

The memory system is layered: MEMORY.md and USER.md files live in ~/.hermes/memories/ and inject into the system prompt as a frozen snapshot at session start. On top of this, Hermes ships 8 external memory provider plugins — Honcho, OpenViking, Mem0, Hindsight, Holographic, RetainDB, ByteRover, and Supermemory — adding knowledge graphs, semantic search, automatic fact extraction, and cross-session user modeling.

Hermes also auto-generates skills: as the agent solves novel tasks, it captures the procedure as a reusable skill. Nous Research benchmarks show agents with 20+ self-created skills complete similar future tasks 40% faster (in tokens and time, not necessarily quality). The improvement is domain-specific — skills don't transfer across domains. Hermes is fully open-source and self-hostable, positioned as the agent that compounds in value the longer you use it.

Key features

Core capabilities this platform advertises.

Persistent memory across sessions in ~/.hermes/memories/
8 external memory provider plugins (Mem0, Honcho, OpenViking, etc.)
Self-generates and reuses skills from past tasks
Layered MEMORY.md + USER.md system-prompt injection
Open-source — 95.6K GitHub stars in 7 weeks

Strengths and tradeoffs

What this tool does well, and the limitations to keep in mind.

Pros

Best-in-class persistent memory across sessions
Auto-generated skills that compound 40% speed gains over time
Open-source under Apache 2.0 — fully self-hostable
Growing ecosystem of 8+ external memory providers
Fastest-growing agent framework of 2026

Cons

Skill transfer is domain-specific — limited cross-domain generalization
Newer project — fewer enterprise references than incumbents
Memory complexity adds setup friction for casual users
Best benefits emerge after 6+ months of consistent use

Plans & pricing

What's included in each plan, and how the tiers compare.

Open Source

Forever

Full agent + memory system
8 external memory provider plugins
Self-hostable — bring your own LLM
Apache 2.0 license

View official pricing page

Common use cases

Solo developers and small teams who use AI agents daily and want one that learns and compounds over time

Long-running personal AI assistant that learns your preferences
Solo developer power-use scenarios where memory compounds
Research and exploration tasks with knowledge accumulation
Project-aware coding workflows across many sessions
Self-hosted private agent with full data ownership

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Best Hermes Agent alternatives & competitors

Top companies in Agent Frameworks you can use instead of Hermes Agent.

OpenClaw

Connects to 50+ channels — WhatsApp, Telegram, Slack, Discord, Signal, iMessage, Teams