What this adds

A single bullet in the Official Integrations section of README.md for H33, the native Rust Model Context Protocol server for the H33 post-quantum security platform.

+ - **[H33](https://github.com/H33ai-postquantum/mcp-h33)** - Native Rust MCP server for the [H33](https://h33.ai) post-quantum security platform: substrate attestation, FHE biometric auth, ZK-STARK proofs, three-family signing (Dilithium + FALCON + SPHINCS+), BotShield, HICS code scoring, HATS Tier 1 governance, and Bitcoin UTXO quantum insurance. \`cargo install h33-mcp\`.

Inserted in alphabetical order between Gyazo and Harper.

Why this belongs in Official Integrations

H33.ai, Inc. maintains h33-mcp as a production MCP server for our platform. It is the canonical surface that AI coding agents (Claude Code, Cursor, Codex, Aider) use to call into H33's post-quantum substrate, FHE biometric pipeline, and ZK-STARK lookups.

• Native Rust. No unsafe code; unwrap() and expect() are denied at the crate level.
• Refuses to start with the wrong key class. The server validates that H33_AGENT_TOKEN looks like a cka_* agent capability token, not a ck_live_* server key, and refuses to start otherwise — this enforces the architectural rule that agents and servers never share credentials.
• Tested. 37 unit tests pass under cargo test. Round-trip integration tests against the H33 staging environment pass.
• Installable today.

  cargo install h33-mcp
  brew install h33ai/tap/h33-mcp
  curl -sSL https://install.h33.ai/mcp | sh

Configuration

Add to ~/.claude/mcp.json (Claude Code) or the equivalent for your client:

```json
{
"mcpServers": {
"h33": {
"command": "h33-mcp",
"env": { "H33_AGENT_TOKEN": "cka_..." }
}
}
}
```

Mint a cka_* token with the sister CLI:

```bash
cargo install h33-cli
h33 mint
export H33_AGENT_TOKEN="cka_..."
```

Links

• Crate: https://crates.io/crates/h33-mcp
• Source: https://github.com/H33ai-postquantum/mcp-h33
• Sister CLI: https://crates.io/crates/h33-cli
• Shared token format crate: https://crates.io/crates/h33-agent-token
• Docs: https://h33.ai/docs
• Homepage: https://h33.ai

Maintainer: H33.ai, Inc. support@h33.ai

Patent pending — 129 claims filed.