Hermes Agent: Tool Memory and MCP Integration

Once Hermes can chat reliably, the next step is understanding why it can “get things done.” The core answer lies in four modules: Tools, Memory, Skills, and MCP. Mastering these transforms Hermes from a simple chat interface into a true working assistant.

Don’t conflate these four modules—they serve distinct purposes:

• Tools answer “Can it act?”
• Memory answers “Will it remember next time?”
• Skills answer “Can workflows be reused?”
• MCP answers “Can it integrate with external systems?”

We visualize them as a capability map because beginners often fixate solely on tool lists—overlooking permission boundaries and long-term maintenance costs.

If you’re using Hermes for personal projects, prioritize like this:

1. Enable read-only tools first.
2. Save only a small set of critical memories.
3. Encode stable, repeatable workflows as Skills. Postpone MCP and remote automation until you’ve identified tasks truly worth automating long-term.

1. What Are Tools?

Tools are Hermes’ means of interacting with the external world. Without tools, large language models generate only text; with tools, Hermes can read files, execute commands, search the web, open browsers, generate images, schedule tasks, and send messages.

When learning about Hermes’ Tools, Memory, Skills, and MCP, start by distinguishing which components handle context persistence, which drive action execution, and which enable external integration.

Official documentation broadly categorizes tools as follows:

• Web: Search and extract content from web pages.
• Terminal & Files: Run shell commands, read/write files, apply patches.
• Browser: Open pages, parse DOM structure, perform visual browsing.
• Media: Analyze/generate images, convert text to speech.
• Agent Orchestration: Plan steps, clarify intent, execute code, delegate to sub-agents.
• Memory & Recall: Store long-term memories, search past conversations.
• Automation & Messaging: Schedule cron jobs, send notifications.
• Integrations: Home Assistant, MCP servers, other external systems.

View current tool configuration:

hermes tools

Launch chat with specific toolsets:

hermes chat --toolsets "web,terminal"

2. Gradually Expand Tool Permissions

New users should not enable all tools at once. Follow this progressive order:

When reading “Hermes Agent: Tools, Memory, Skills, and MCP”, first align the questions, keywords, actions, and acceptance criteria shown in the diagram—then read the main text. Afterward, try explaining the concepts again using your own project.

1. Start with read-only tools: file reading, web search.
2. Then add low-risk tools: report generation, text summarization.
3. Next enable write tools: editing files, generating code.
4. Finally consider high-privilege tools: terminal execution, Docker, SSH, cron, message sending.

The more capable an agent becomes, the more critical its boundaries become—especially around production servers, databases, payment systems, authentication logic, or deployment scripts. Never grant unrestricted access.

3. Terminal Backends

Hermes’ terminal tools can execute across multiple backends:

Backend	Use Case
local	Local development, trusted tasks
docker	Isolated sandbox, reproducible environments
ssh	Remote servers or machines with greater compute power
singularity	HPC clusters
modal	Ephemeral cloud compute
daytona	Hosted cloud workspaces
vercel_sandbox	Lightweight cloud VMs

The simplest default is local execution:

terminal:
  backend: local

For improved safety, switch to Docker:

hermes config set terminal.backend docker

The Docker backend functions like a persistent sandbox: commands run inside containers, and installed packages or written files persist across sessions.

4. Memory System

Hermes stores memory at:

~/.hermes/memories/

Two primary files exist:

• MEMORY.md: Hermes’ internal notes—e.g., environment facts, project conventions, learned heuristics.
• USER.md: User profile—e.g., communication preferences, writing style, recurring habits.

More memory isn’t always better. Official documentation enforces capacity limits precisely to ensure only truly essential information is retained.

Good candidates for memory:

• “My blog project lives at /var/www/my-markdown-site.”
• “I prefer Chinese replies, with conclusions stated upfront.”
• “Deployment requires passing build checks first.”
• “Production service restarts require manual confirmation.”

Avoid storing in memory:

• One-off temporary queries.
• API keys, passwords, tokens.
• Unverified assumptions or guesses.
• Full copies of lengthy documents.

5. Skills System

Skills encode reusable, structured workflows for Hermes. They reside in:

~/.hermes/skills/

Think of a Skill as a documented procedure: “When encountering this type of task, here’s exactly how the agent should proceed.”

List available skills:

hermes skills

Search skills:

hermes skills search kubernetes

Install a skill:

hermes skills install openai/skills/k8s

Invoke skills directly in chat using slash commands:

/plan Help me design an automated blog deployment workflow.

Skills excel at codifying standardized processes such as:

• Consistent article formatting.
• Fixed deployment checklists.
• Standardized code review criteria.
• Prescribed data analysis templates.

6. What Is MCP?

MCP stands for Model Context Protocol, enabling Hermes to connect to external tool servers. Through MCP, you can integrate GitHub, databases, filesystems, internal company APIs, knowledge bases, and more.

Hermes’ MCP configuration resides under mcp_servers in ~/.hermes/config.yaml.

Minimal stdio-based example:

mcp_servers:
  filesystem:
    command: "npx"
    args: ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"]

HTTP-based MCP example:

mcp_servers:
  company_api:
    url: "https://mcp.internal.example.com"
    headers:
      Authorization: "Bearer ***"

⚠️ Note: Tokens in examples are placeholders only. Never commit real secrets to version control—or expose them publicly to agents.

7. A Practical Combination

To turn Hermes into a project assistant, combine modules like this:

• Tools: Enable terminal, file, and web.
• Backend: Use local for development; switch to docker when security matters.
• Memory: Store project paths, deployment procedures, and hard constraints (e.g., “never auto-restart prod”).
• Skills: Create a “Blog Post Publishing Checklist” skill.
• MCP: Connect to GitHub or your internal knowledge base.

Then ask:

Review today’s changes in this project. Tell me whether they’re safe to commit, and generate a concise commit message.

Hermes will read files, compare diffs, assess risk—and format the response according to your historical preferences.

At this point, distill “Hermes Agent: Tools, Memory, Skills, and MCP” into a retrospective table: clarify the central narrative first, then validate it against a small concrete task.

After finishing “Hermes Agent: Tools, Memory, Skills, and MCP”, pick one small end-to-end example to run through fully—then assess which steps you can now execute independently.

8. Summary

• Tools empower Hermes to act.
• Memory enables it to persist context.
• Skills let it reuse proven workflows.
• MCP allows it to extend into external systems.

Using Hermes effectively isn’t about memorizing commands—it’s about thoughtfully selecting and composing the right capabilities for each task.