pic-standard 0.5.2

PIC Standard: Provenance & Intent Contracts for agentic side-effect governance

PIC Standard: Provenance & Intent Contracts

The Open Protocol for Causal Governance in Agentic AI.

PIC closes the causal gap: when untrusted inputs (prompt injection, user text, web pages) influence high‑impact side effects (payments, exports, infra changes), PIC forces a machine‑verifiable contract between what the agent claims and what evidence actually backs it.

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Quickstart

# Install core (schema + verifier + CLI)
pip install pic-standard

# Verify an example proposal
pic-cli verify examples/financial_irreversible.json
# ✅ Schema valid
# ✅ Verifier passed

Optional extras:

pip install "pic-standard[langgraph]"  # LangGraph integration
pip install "pic-standard[mcp]"        # MCP integration
pip install "pic-standard[crypto]"     # Signature evidence (Ed25519)

From source (contributors):

git clone https://github.com/madeinplutofabio/pic-standard.git
cd pic-standard && pip install -e .
pytest -q  # run tests

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The PIC Contract

PIC uses an Action Proposal JSON (protocol: PIC/1.0). The agent emits it right before executing a tool:

Field	Purpose
intent	What the agent is trying to do
impact	Risk class (money, privacy, irreversible, …)
provenance	Which inputs influenced the decision (and their trust level)
claims + evidence	What the agent asserts and which evidence IDs support it
action	The actual tool call being attempted (tool binding)

Verifier rule: For high‑impact proposals (money, privacy, irreversible), at least one claim must reference evidence from TRUSTED provenance. Fail‑closed.

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Evidence Verification

PIC supports deterministic evidence verification that upgrades provenance trust in-memory.

Version	Type	Description
v0.3	hash	SHA-256 verification of file artifacts (file://...)
v0.4	sig	Ed25519 signature verification via trusted keyring

# Verify hash evidence
pic-cli evidence-verify examples/financial_hash_ok.json

# Verify signature evidence
pic-cli evidence-verify examples/financial_sig_ok.json

# Full pipeline: schema → evidence → verifier
pic-cli verify examples/financial_hash_ok.json --verify-evidence

📖 Full guide: docs/evidence.md

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Keyring (Trusted Signers)

Signature evidence requires a keyring of trusted public keys.

# Inspect current keyring
pic-cli keys

# Generate starter keyring
pic-cli keys --write-example > pic_keys.json

PIC loads keys from PIC_KEYS_PATH env var, or ./pic_keys.json, or empty (no signers).

📖 Full guide: docs/keyring.md — key formats, expiry, revocation, rotation

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Integrations

LangGraph

Enforce PIC at the tool boundary with PICToolNode:

pip install "pic-standard[langgraph]"
python examples/langgraph_pic_toolnode_demo.py

• Requires __pic proposal in each tool call
• Validates schema + verifier + tool binding
• Returns ToolMessage outputs

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MCP (Model Context Protocol)

Enforce PIC at the MCP tool boundary with production defaults:

pip install "pic-standard[mcp]"
python -u examples/mcp_pic_client_demo.py

• Fail‑closed (blocks on verifier/evidence failure)
• Debug gating (PIC_DEBUG=1 for diagnostics)
• Request tracing, DoS limits, evidence sandboxing

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OpenClaw

Plugin for OpenClaw AI agents via the hook API:

# 1. Start the PIC bridge
pip install pic-standard
pic-cli serve --port 7580

# 2. Build and install the plugin
cd integrations/openclaw
npm install && npm run build
openclaw plugins install .
# Or manually: cp -r . ~/.openclaw/extensions/pic-guard/

• pic-gate — verifies proposals before tool execution
• pic-init — injects PIC awareness at session start
• pic-audit — structured audit logging

📖 Full guide: docs/openclaw-integration.md

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How It Works

graph TD
    A[Untrusted Input] --> B{AI Agent / Planner}
    C[Trusted Data/DB] --> B
    B --> D[Action Proposal JSON]
    D --> E[PIC Verifier Middleware]
    E --> F{Valid Contract?}
    F -- Yes --> G[Tool Executor]
    F -- No --> H[Blocked / Alert Log]

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Why PIC?

Guardrails constrain what the model says. PIC constrains what the agent is allowed to do (side effects) based on verifiable provenance + evidence.

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Versioning

• PIC/1.0 — the proposal protocol (schema)
• Python package follows Semantic Versioning

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Roadmap

• [✅] Phase 1: Standardize money and privacy Impact Classes
• [✅] Phase 2: Reference Python verifier + CLI
• [✅] Phase 3: Anchor integrations (LangGraph + MCP)
• [✅] Phase 4: Evidence verification (hash + signature)
• [✅] Phase 5: OpenClaw integration
• [⬜] Phase 6: Additional SDKs (TypeScript) + case studies + audit

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Community

We're actively seeking:

• Security researchers to stress‑test causal logic
• Framework authors to build native integrations
• Enterprise architects to define domain Impact Classes

Maintained by @fmsalvadori   MadeInPluto