feat: add ThoughtProof verification plugin (Sentinel + RV)

[ThoughtProof]

ThoughtProof Verification Plugin

Adds epistemic verification for AI agents — catch bad reasoning before it costs money.

Two products, one flow:

• Sentinel — fast pre-execution triage (~$0.003, ~2s). Call on every decision.
• RV — adversarial deep verification (~$0.02–0.08, 5–45s). Call when Sentinel is uncertain or stakes are high.

Actions (4 + 1 internal hook)

Action	Purpose	Risk	Cost
thoughtproof.sentinel	Pre-execution check (ALLOW/BLOCK/UNCERTAIN)	read	~$0.003
thoughtproof.verify	Adversarial reality verification (evaluate → critique → synthesize)	read	$0.02–0.08
thoughtproof.attest	On-chain attestation (EAS for Sentinel, TP-VC for RV)	medium	gas
thoughtproof.status	Health check both APIs	read	free
(internal) reputation hook	ERC-8004 feedback after verification	—	gas

Features

• x402 pay-per-call — native HTTP 402 support, zero subscription needed
• maxPaymentAmount safety cap — prevent compromised servers from draining wallets
• Sentinel → RV escalation — fast triage on every decision, deep analysis only when needed
• ERC-8004 reputation — automatic, not agent-callable (prevents self-scoring)
• 3 auth modes — API key, x402 signer, or pre-configured x402 fetch

Already published

This plugin is also available as a standalone npm package:

npm install @thoughtproof/goat-plugin

npmjs.com/package/@thoughtproof/goat-plugin — published, 31 tests passing, 0 TS errors.

Files

plugins/thoughtproof/           — 9 source files
tests/unit/thoughtproof.test.ts — 31 tests
examples/thoughtproof-verification/ — demo agent
plugins/index.ts                — 1 line added (export)

Links

• ThoughtProof
• Sentinel API
• ERC-8004
• x402