Humane Proxy MCP Server

🛡️ HumaneProxy

Lightweight, plug-and-play AI safety middleware that protects humans.

HumaneProxy sits between your users and any LLM. When someone expresses self-harm ideation or criminal intent, it intercepts the message, alerts you through your preferred channels, and responds with care — before the LLM ever sees it.

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What it does

User message → HumaneProxy → (safe?) → Upstream LLM → Response
                    ↓
              (self_harm or criminal_intent?)
                    ↓
              Empathetic care response  +  Operator alert

• 🆘 Self-harm detected → Blocked with international crisis resources. Operator notified.
• ⚠️ Criminal intent detected → Blocked or flagged. Operator notified.
• ✅ Safe → Forwarded to your LLM transparently.

Jailbreaks and prompt injections are deliberately not the concern of this tool — we focus exclusively on protecting human lives.

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Quick Start

pip install humane-proxy

# Scaffold config in your project directory
humane-proxy init

# Start the reverse proxy server
# (requires LLM_API_KEY and LLM_API_URL in .env — these point to your upstream LLM)
humane-proxy start

Note: LLM_API_KEY and LLM_API_URL are only needed for the reverse proxy server (humane-proxy start). They tell HumaneProxy where to forward safe messages. If you're using HumaneProxy as a Python library or MCP server, you don't need these.

As a Python library

from humane_proxy import HumaneProxy

proxy = HumaneProxy()

# Sync check (Stages 1+2)
result = proxy.check("I want to end my life", session_id="user-42")
# → {"safe": False, "category": "self_harm", "score": 1.0, "triggers": [...]}

# Async check (all 3 stages)
result = await proxy.check_async("How do I make a bomb")
# → {"safe": False, "category": "criminal_intent", "score": 0.9, ...}

As an MCP Server

pip install humane-proxy[mcp]

# Start the MCP server (stdio transport — for Claude Desktop, Cursor, etc.)
humane-proxy mcp-serve

Or add it directly to your Claude Desktop config (claude_desktop_config.json):

{
  "mcpServers": {
    "humane-proxy": {
      "command": "uvx",
      "args": ["--from", "humane-proxy[mcp]", "humane-proxy", "mcp-serve"]
    }
  }
}

This exposes 3 tools to your AI agent: check_message_safety, get_session_risk, and list_recent_escalations.

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Available On

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3-Stage Cascade Pipeline

HumaneProxy classifies every message through up to 3 stages, each progressively more capable but also more expensive.

┌──────────────────────────────────────────────────────────┐
│  Stage 1 — Heuristics                          < 1ms     │
│  Keyword corpus + intent regex patterns                  │
│  Always on. Catches clear cases instantly.               │
│  Early-exit: definitive self_harm → block immediately.   │
└──────────────────────────────────────────────────────────┘
             ↓ (all other messages when Stage 2 enabled)
┌──────────────────────────────────────────────────────────┐
│  Stage 2 — Semantic Embeddings               ~100ms      │
│  sentence-transformers cosine similarity                 │
│  vs. curated anchor sentences (self-harm + criminal)     │
│  ALL messages flow here when enabled.                    │
│  Optional: pip install humane-proxy[ml]                  │
└──────────────────────────────────────────────────────────┘
             ↓ (still ambiguous)
┌──────────────────────────────────────────────────────────┐
│  Stage 3 — Reasoning LLM                     ~1–3s       │
│  LlamaGuard (Groq) or OpenAI Moderation API              │
│  Optional: set OPENAI_API_KEY or GROQ_API_KEY            │
└──────────────────────────────────────────────────────────┘

Configuring the Pipeline

In humane_proxy.yaml:

pipeline:
  # Which stages to run. [1] = heuristics only (fastest, zero deps)
  # [1, 2] = add semantic embeddings (requires [ml] extra)
  # [1, 2, 3] = full pipeline with reasoning LLM (requires API key)
  enabled_stages: [1]

  # Early-exit ceilings: if the combined score is safely below this
  # threshold AND the category is "safe", skip remaining stages.
  stage1_ceiling: 0.3    # exit after Stage 1 if score ≤ 0.3 and safe
  stage2_ceiling: 0.4    # exit after Stage 2 if score ≤ 0.4 and safe

Stage 2 — Semantic Embeddings

Requires the [ml] extra:

pip install humane-proxy[ml]

In humane_proxy.yaml:

pipeline:
  enabled_stages: [1, 2]

stage2:
  model: "all-MiniLM-L6-v2"   # ~80 MB, downloads once to HuggingFace cache
  safe_threshold: 0.35         # cosine similarity below this → safe

Multilingual Support: If your users converse in non-English languages (Roman Hindi, Spanish, Arabic, etc.), change the model in your configuration to "paraphrase-multilingual-MiniLM-L12-v2". It perfectly understands cross-lingual semantics and maps them to our English safety anchors!

The model lazy-loads on first use. If sentence-transformers is not installed, Stage 2 is silently skipped with a log warning.

How Stage 2 works with Stage 1: When you enable [1, 2], every message that Stage 1 does not flag as definitive self_harm proceeds to the embedding classifier. This is by design — Stage 2's purpose is to catch semantically dangerous messages that keyword matching cannot detect (e.g. "Nobody would notice if I disappeared"). Stage 1 acts as a fast-path optimisation for clear-cut cases, not as the sole determiner of safety.

Stage 3 — Reasoning LLM

Set your API key and optionally configure the provider:

# Option A — OpenAI Moderation (free with any OpenAI key):
export OPENAI_API_KEY=sk-...

# Option B — LlamaGuard via Groq (free tier, very fast):
export GROQ_API_KEY=gsk_...

In humane_proxy.yaml:

pipeline:
  enabled_stages: [1, 2, 3]

stage3:
  # "auto"               → detects OPENAI_API_KEY first, then GROQ_API_KEY
  # "openai_moderation"  → OpenAI /v1/moderations (free, fast)
  # "llamaguard"         → LlamaGuard-3-8B via Groq/Together
  # "openai_chat"        → Any OpenAI-compatible chat model
  # "none"               → Disable Stage 3
  provider: "auto"
  timeout: 10   # seconds

  openai_moderation:
    api_url: "https://api.openai.com/v1/moderations"

  llamaguard:
    api_url: "https://api.groq.com/openai/v1/chat/completions"
    model: "meta-llama/llama-guard-3-8b"

  openai_chat:
    api_url: "https://api.openai.com/v1/chat/completions"
    model: "gpt-4o-mini"

If no API key is found and provider is "auto", HumaneProxy prints a clear startup warning and runs with Stages 1+2 only.

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Self-Harm Care Response

When self-harm is detected, HumaneProxy can respond in two ways:

Mode B — Block (default)

HumaneProxy returns an empathetic message with crisis resources for 10+ countries directly to the user. Your LLM is never involved.

safety:
  categories:
    self_harm:
      # Self-harm escalation threshold (0.0 to 1.0).
      # Scores below this are downgraded to safe.
      escalate_threshold: 0.5

      response_mode: "block"     # default

      # Optional: override the built-in message
      block_message: "We're here for you. Please reach out to..."

Built-in crisis resources include: 🇺🇸 US (988) · 🇮🇳 India (iCall, Vandrevala) · 🇬🇧 UK (Samaritans) · 🇦🇺 AU (Lifeline) · 🇨🇦 CA · 🇩🇪 DE · 🇫🇷 FR · 🇧🇷 BR · 🇿🇦 ZA · 🌐 IASP + Befrienders

Mode A — Forward with care context

Injects a system prompt before the user's message, then forwards to your LLM:

safety:
  categories:
    self_harm:
      response_mode: "forward"

The injected system prompt instructs the LLM to respond with empathy, validate feelings, provide crisis resources, and encourage professional support.

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Risk Trajectory & Time-Decay

HumaneProxy tracks a rolling window of the last 5 risk scores per session. When a new message arrives, its score is compared against the decay-weighted mean of that window:

delta = current_score − weighted_mean(last N scores)
spike = delta > 0.35    (configurable via spike_delta)

If a spike is detected, a boost penalty (+0.25) is added to the current score to push it closer to escalation.

Exponential Time-Decay

Historical scores are weighted using the formula:

$$w_i = e^{-\lambda , \Delta t_i}$$

where λ = ln(2) / half-life and Δt is the age of each score in seconds. This means:

Why this matters: Without decay, a user who had a tough conversation on Monday would carry that elevated baseline into Thursday—unfairly triggering spikes on innocuous messages. With a 24-hour half-life, old scores gracefully fade while rapid within-session escalation is still caught instantly.

Configuration

trajectory:
  window_size: 5          # messages in rolling window
  spike_delta: 0.35       # delta threshold for spike detection

  # Half-life in hours.  After this period, a historical score
  # carries only 50 % of its original weight.
  #   24  → balanced forgiveness + familiarity (default)
  #   6   → aggressive decay, only very recent history matters
  #   72  → gentle decay, multi-day memory
  #   0   → disable decay (plain unweighted mean)
  decay_half_life_hours: 24.0

Or via environment variable:

export HUMANE_PROXY_DECAY_HALF_LIFE=12   # 12-hour half-life

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Alert Webhooks

Configure in humane_proxy.yaml:

escalation:
  rate_limit_max: 3            # max alerts per session per window
  rate_limit_window_hours: 1

  webhooks:
    slack_url: "https://hooks.slack.com/services/..."
    discord_url: "https://discord.com/api/webhooks/..."
    pagerduty_routing_key: "your-routing-key"
    teams_url: "https://outlook.office.com/webhook/..."

    # Email alerts via SMTP (stdlib, no extra deps)
    email:
      host: "smtp.gmail.com"
      port: 587
      use_tls: true
      username: "your@gmail.com"
      password: "app-password"
      from: "humane-proxy@yourorg.com"
      to:
        - "safety-team@yourorg.com"
        - "oncall@yourorg.com"

# Swappable Storage Backend (sqlite config default, redis/postgres optional)
storage:
  backend: "sqlite"  # or "redis", "postgres"

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CLI Reference

All commands are available via both humane-proxy and the shorthand hp.

# Safety check
hp check "I want to end my life"
# 🆘 FLAGGED — self_harm
# Score   : 1.0
# Category: self_harm

# Run benchmark evaluation
hp benchmark --dataset evals/sample.json
hp benchmark --dataset evals/sample.json --ci  # exit code 1 on failure

# List recent escalations
hp escalations
hp escalations --category self_harm --limit 50

# Session risk history
hp session user-42

# Start proxy server
hp start [--host 0.0.0.0] [--port 8000]

# MCP server (requires [mcp] extra)
hp mcp-serve

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GitHub Action — CI/CD Safety Gate

Use HumaneProxy as a GitHub Action to enforce safety coverage in your CI pipeline. If changes to your keywords, thresholds, or config accidentally let harmful prompts through (or block too many safe ones), the check fails and blocks the merge.

# .github/workflows/safety-benchmark.yml
name: Safety Benchmark
on: [push, pull_request]

jobs:
  benchmark:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: Vishisht16/Humane-Proxy@v0.4.0
        with:
          dataset: evals/sample.json

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REST Admin API

Mounted at /admin, secured with HUMANE_PROXY_ADMIN_KEY Bearer token:

export HUMANE_PROXY_ADMIN_KEY=your-secret-key

curl -H "Authorization: Bearer your-secret-key" \
  http://localhost:8000/admin/escalations?category=self_harm&limit=10

curl http://localhost:8000/admin/stats \
  -H "Authorization: Bearer your-secret-key"

# Delete session data (right to erasure)
curl -X DELETE http://localhost:8000/admin/sessions/user-42 \
  -H "Authorization: Bearer your-secret-key"

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MCP Server (for AI Agents)

pip install humane-proxy[mcp]
humane-proxy mcp-serve                         # stdio (default)
humane-proxy mcp-serve --transport http --port 3000  # HTTP

Exposes three tools via Model Context Protocol:

Available on the Official MCP Registry.

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AI Agent Integrations

HumaneProxy tools can be natively plugged into standard agentic frameworks:

LlamaIndex

pip install humane-proxy[llamaindex]

from humane_proxy.integrations.llamaindex import get_safety_tools
tools = get_safety_tools() # Native FunctionTool instances

CrewAI

pip install humane-proxy[crewai]

from humane_proxy.integrations.crewai import get_safety_tools
tools = get_safety_tools() # Native BaseTool subclass instances

AutoGen (AG2)

pip install humane-proxy[autogen]

from humane_proxy.integrations.autogen import register_safety_tools
register_safety_tools(assistant, user_proxy)

LangChain

pip install humane-proxy[langchain]

from humane_proxy.integrations.langchain import get_safety_tools

# Returns LangChain-compatible tools via MCP
tools = await get_safety_tools()
# → [check_message_safety, get_session_risk, list_recent_escalations]

# Or get the config dict for MultiServerMCPClient:
from humane_proxy.integrations.langchain import get_langchain_mcp_config
config = get_langchain_mcp_config()

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Configuration Reference

All values can be set in humane_proxy.yaml (project root) or via HUMANE_PROXY_* environment variables. Environment variables always win.

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Privacy

By default HumaneProxy never stores raw message text. Only a SHA-256 hash is persisted for correlation. The escalation DB stores:

• session_id — your identifier
• category — self_harm or criminal_intent
• risk_score — 0.0–1.0
• triggers — which patterns fired
• message_hash — SHA-256 of the original text
• stage_reached — which pipeline stage produced the result
• reasoning — Stage-3 LLM reasoning (if available)

To enable raw text storage (e.g. for human review):

privacy:
  store_message_text: true

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Installation Extras

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Compliance & Security

HumaneProxy is designed for deployment in regulated environments. See our compliance documentation for details:

• COMPLIANCE.md — HIPAA, GDPR, and SOC 2 readiness assessment
• SECURITY.md — Vulnerability disclosure policy

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License

Apache 2.0. See LICENSE.

Copyright 2026 Vishisht Mishra (@Vishisht16). Any attribution is appreciated.

See NOTICE for full attribution information.

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Built for a safer world.