Hermes MCP

A comprehensive Elixir/OTP implementation of the Model Context Protocol providing both client and server functionality, leveraging Elixir's concurrency model and fault tolerance for building robust MCP integrations in Phoenix and standalone applications.

Evaluated Mar 01, 2026 (50d ago) vv0.14.1
Homepage ↗ Repo ↗ Sdk elixir mcp-sdk erlang-otp phoenix high-concurrency fault-tolerant mcp-server mcp-client open-source
⚙ Agent Friendliness
75
/ 100
Can an agent use this?
🔒 Security
72
/ 100
Is it safe for agents?
⚡ Reliability
N/A
Not evaluated
Does it work consistently?
AF Security Reliability

Best When

You are building MCP infrastructure in an Elixir/Phoenix application and need production-grade concurrency, fault tolerance, and hot code reloading.

Avoid When

Your team does not have Elixir expertise — the learning curve plus MCP complexity is significant for non-Elixir shops.

Use Cases

  • Building MCP servers in Elixir/Phoenix applications that expose custom tools to AI assistants
  • Creating MCP clients in Elixir to connect to and interact with existing MCP servers
  • Running high-concurrency, fault-tolerant MCP infrastructure where OTP supervision trees provide resilience

Not For

  • Teams not using Elixir/Erlang — this SDK is Elixir-specific
  • Rapid prototyping where Python or TypeScript MCP SDKs have more examples and community resources
  • Simple single-tool integrations where the full OTP supervision model adds unnecessary complexity

Alternatives

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Scores are editorial opinions as of 2026-03-01.

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Packages Evaluated
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Need Evaluation
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