8004-MCP - Agent Registry Protocol

Multi-chain MCP server for ERC-8004 Agent Registry. Query agents, reputation, and feedback across Solana + EVM chains.

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⚡ First Time Setup (IMPORTANT)

1. Check System Health

await client.callTool({ name: 'health_check', arguments: {} });
// Returns: { server: 'ok', chains: {...}, walletStore: 'not_initialized', ... }

2. Initialize Wallet Store (One-Time)

The wallet store encrypts all your wallets with a single master password.

// ⚠️ SAVE THIS PASSWORD - Cannot be recovered if lost!
await client.callTool({ name: 'wallet_store_init', arguments: {
  password: 'YourSecureMasterPassword123!'
}});
// Returns: { initialized: true, message: 'Wallet store created' }

3. Create a Wallet

await client.callTool({ name: 'wallet_create', arguments: {
  name: 'my-eth-wallet',
  chainType: 'evm'  // or 'solana'
}});
// Returns: { name: 'my-eth-wallet', address: '0x...', chainType: 'evm' }

4. Fund Your Wallet

Check the "Approximate Costs" section below for funding amounts.

// Get faucet info (testnet) or ask owner (mainnet)
const funding = await client.callTool({ name: 'faucet_info', arguments: {
  chain: 'eth'  // or 'sol', 'base'
}});
// Returns faucet URLs and wallet address

⚠️ Important for Agents:

• See "Approximate Costs" section for funding amounts
• Faucets require captchas - you can't use them directly
• Ask your owner to fund your wallet
• On mainnet: no faucets, must ask owner for real funds

5. On New Sessions - Unlock Store

await client.callTool({ name: 'wallet_store_unlock', arguments: {
  password: 'YourSecureMasterPassword123!'
}});
// Now all write operations work

Common Issues

Symptom	Cause	Solution
STORE_NOT_INITIALIZED	First run	Call wallet_store_init
STORE_LOCKED	New session	Call wallet_store_unlock
INVALID_PASSWORD	Wrong password	Check password (no recovery!)
Timeout on wallet ops	Store locked	Unlock first
INSUFFICIENT_BALANCE	Empty wallet	Ask owner to fund (see below)

Requesting Funds from Owner

As an agent, you cannot use faucets directly (captchas). Ask your owner:

// 1. Get your wallet address
const info = await client.callTool({ name: 'faucet_info', arguments: { chain: 'eth' }});

// 2. Ask owner to fund (see "Approximate Costs" section for amounts)
// Example: "Please fund my wallet 0x1234... with ~0.01 SOL or ~$0.50 in ETH"

// 3. Wait for owner to send funds, then proceed with agent_register

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Quick Start (MCP Client)

import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
import { spawn } from 'child_process';

const server = spawn('npx', ['@quantulabs/8004-mcp'], {
  stdio: ['pipe', 'pipe', 'inherit'],
  env: { ...process.env, NETWORK_MODE: 'testnet' }
});

const client = new Client(
  { name: 'my-agent', version: '1.0.0' },
  { capabilities: {} }
);

await client.connect(new StdioClientTransport({
  reader: server.stdout,
  writer: server.stdin,
}));

// Ready - use client.callTool()

Global ID Format

Chain	Format	Example
Solana	sol:<pubkey>	sol:HHCVWcqs...
Ethereum	eth:<chainId>:<tokenId>	eth:11155111:738
Base	base:<chainId>:<tokenId>	base:84532:42

---

Core Tools

Read Operations (No wallet needed)

agent_search

Search agents across chains.

await client.callTool({ name: 'agent_search', arguments: {
  query: 'trading bot',      // Search name/description
  chain: 'eth',              // Optional: sol, eth, base, arb, poly, op
  limit: 20,                 // Default: 20, max: 100
  offset: 0,                 // Pagination offset
  cursor: 'abc...',          // Cursor pagination (EVM only, faster)
  // Advanced filters (EVM only):
  hasMcp: true,              // Has MCP endpoint
  hasA2a: true,              // Has A2A endpoint
  active: true,              // Active agents only
  x402support: true,         // Supports x402 payments
  mcpTools: ['web-search'],  // Has specific MCP tools
  a2aSkills: ['translation'] // Has specific A2A skills
}});
// Returns: { results: IAgentSummary[], total, hasMore, cursor? }

cache_search

Fast fuzzy search (FTS5). Use for partial name matches.

await client.callTool({ name: 'cache_search', arguments: {
  query: 'Upsense',  // Partial match works
  chain: 'all',
  limit: 20
}});

agent_get

Get agent details by ID.

await client.callTool({ name: 'agent_get', arguments: {
  id: 'eth:11155111:738'  // Global ID
}});
// Returns: IAgent with name, description, owner, endpoints, metadata

agent_exists

Check if agent exists.

await client.callTool({ name: 'agent_exists', arguments: {
  id: 'sol:HHCVWcqs...'
}});
// Returns: { exists: boolean }

reputation_get

Get reputation summary.

await client.callTool({ name: 'reputation_get', arguments: {
  id: 'sol:HHCVWcqs...'
}});
// Returns: { averageScore, totalFeedbacks, trustTier (Solana only) }

feedback_list

List feedbacks for an agent.

await client.callTool({ name: 'feedback_list', arguments: {
  id: 'sol:HHCVWcqs...',
  limit: 20,
  minScore: 50  // Optional filter
}});

leaderboard_get

Top agents by reputation.

await client.callTool({ name: 'leaderboard_get', arguments: {
  chain: 'sol',
  limit: 10
}});

solana_atom_stats_get

ATOM reputation metrics (Solana only).

await client.callTool({ name: 'solana_atom_stats_get', arguments: {
  asset: 'HHCVWcqs...'  // Solana pubkey (no sol: prefix)
}});
// Returns: { qualityScore, trustTier, uniqueClients, fastEma, slowEma }

solana_integrity_verify

Verify indexer data integrity (Solana only).

await client.callTool({ name: 'solana_integrity_verify', arguments: {
  asset: 'HHCVWcqs...'
}});
// Returns: { status: 'valid' | 'syncing' | 'corrupted' }

Write Operations (Wallet required)

Wallet Store Setup (Master Password)

// 1. Initialize store (one-time) - SAVE THE MASTER PASSWORD!
await client.callTool({ name: 'wallet_store_init', arguments: {
  password: 'MySecureMaster123!'
}});

// 2. Create wallets (stored in encrypted store)
await client.callTool({ name: 'wallet_create', arguments: {
  name: 'my-solana',
  chainType: 'solana'  // or 'evm'
}});

// 3. On new session, unlock store with master password
await client.callTool({ name: 'wallet_store_unlock', arguments: {
  password: 'MySecureMaster123!'
}});

// 4. Now write operations work (all wallets unlocked)

feedback_give

Submit feedback for an agent.

await client.callTool({ name: 'feedback_give', arguments: {
  id: 'sol:HHCVWcqs...',
  value: 85,              // Score 0-100
  tag1: 'uptime',         // Category tag
  tag2: 'day',            // Period tag
  comment: 'Great agent', // Optional
  skipSend: false         // true = dry-run (returns unsigned tx)
}});

agent_register

Register new agent on-chain. See "Approximate Costs" section for funding.

await client.callTool({ name: 'agent_register', arguments: {
  chain: 'eth',  // or 'sol', 'base', etc.
  name: 'My Agent',
  description: 'Does cool stuff',
  tokenUri: 'https://example.com/agent.json',  // Optional: your hosted metadata
  // If no tokenUri: SDK uploads to IPFS automatically
}});

---

Approximate Costs

Solana (Devnet/Mainnet)

Operation	Cost	Notes
agent_register	~0.01 SOL	Includes ATOM stats account
feedback_give	~0.0005 SOL	Event-based, low rent
feedback_response_append	~0.0005 SOL	Event-based
agent_uri_update	~0.00005 SOL	Tx fee only

EVM - L2 Chains (Base, Arbitrum, Optimism)

Recommended for lowest costs.

Operation	Gas	Typical Cost
agent_register	150-200k	$0.01-0.50
feedback_give	100k	$0.01-0.30
feedback_response_append	60k	$0.01-0.20
agent_uri_update	50k	$0.01-0.15

EVM - Ethereum Mainnet

High variability - gas spikes during congestion.

Operation	Gas	Cost (25-100 gwei)
agent_register	150-200k	$10-60
feedback_give	100k	$7-30
feedback_response_append	60k	$4-18
agent_uri_update	50k	$3-15

Tip: Use L2 chains (Base, Arbitrum) for 10-100x lower costs than Ethereum mainnet.

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Dry-Run Mode (skipSend)

Test write operations without funds or broadcasting:

// Returns unsigned transaction, no funds needed
const preview = await client.callTool({ name: 'feedback_give', arguments: {
  id: 'sol:HHCVWcqs...',
  value: 85,
  tag1: 'uptime',
  skipSend: true  // Dry-run
}});
// preview.content[0].text contains: { unsigned: true, transaction: "base64...", message: "..." }

Supported on: feedback_give, agent_register, agent_transfer, agent_uri_update, feedback_revoke, solana_validation_request, solana_validation_respond

---

Network Configuration

// Check current network
await client.callTool({ name: 'network_get', arguments: {} });

// Switch to mainnet
await client.callTool({ name: 'network_set', arguments: { mode: 'mainnet' } });

// Switch to testnet (default)
await client.callTool({ name: 'network_set', arguments: { mode: 'testnet' } });

Network	Solana	Ethereum	Base
testnet	devnet	Sepolia (11155111)	Base Sepolia (84532)
mainnet	mainnet-beta	Mainnet (1)	Base (8453)

---

x402 Protocol

Payment-linked reputation.

// 1. Build identity for 402 response
const identity = await client.callTool({ name: 'x402_identity_build', arguments: {
  agentId: 'sol:HHCVWcqs...'
}});

// 2. Parse payment proof from response header
const proof = await client.callTool({ name: 'x402_proof_parse', arguments: {
  paymentResponse: 'base64-encoded-header...'
}});

// 3. Submit feedback with proof
await client.callTool({ name: 'x402_feedback_submit', arguments: {
  agentId: 'sol:HHCVWcqs...',
  value: 90,
  tag1: 'x402-resource-delivered',
  tag2: 'exact-svm',
  proofOfPayment: proof.proofOfPayment
}});

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Error Codes

Error	Cause	Solution
STORE_LOCKED	Write op without unlock	Call wallet_store_unlock with master password
STORE_NOT_INITIALIZED	No wallet store	Call wallet_store_init first
INVALID_PASSWORD	Wrong master password	Check password (cannot recover if lost)
AGENT_NOT_FOUND	Invalid ID	Verify global ID format
INSUFFICIENT_BALANCE	Wallet empty	Fund wallet address
PROVIDER_NOT_AVAILABLE	Chain not initialized	Check network_get

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OASF Standards

// List valid skill slugs
await client.callTool({ name: 'oasf_list_skills', arguments: {} });

// List valid domain slugs
await client.callTool({ name: 'oasf_list_domains', arguments: {} });

// List feedback tags
await client.callTool({ name: 'oasf_list_tags', arguments: {} });

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All Tools Reference

Agent Operations

• agent_get - Get agent by ID
• agent_exists - Check existence
• agent_search - Search with filters
• agent_list_by_owner - List by owner address
• agent_register - Register new agent (write)
• agent_transfer - Transfer ownership (write)
• agent_uri_update - Update metadata URI (write)
• agent_metadata_set - Set on-chain metadata (Solana, write)

Feedback Operations

• feedback_give - Submit feedback (write)
• feedback_read - Read single feedback
• feedback_list - List feedbacks
• feedback_revoke - Revoke feedback (write)
• feedback_response_append - Respond to feedback (write)

Reputation Operations

• reputation_get - Get summary
• leaderboard_get - Top agents

Collection Operations

• collection_get - Get collection details
• collection_list - List collections
• collection_agents - List agents in collection
• collection_base_get - Get base registry
• collection_create - Create collection (Solana, write)
• collection_uri_update - Update collection URI (Solana, write)

Wallet Store (Master Password)

• wallet_store_init - Initialize store with master password
• wallet_store_unlock - Unlock all wallets with master password
• wallet_store_lock - Lock store (secure wipe)
• wallet_store_status - Get store status
• wallet_store_change_password - Change master password
• wallet_store_migrate - Migrate legacy wallets

Wallet Operations

• wallet_list - List wallets in store
• wallet_info - Wallet details
• wallet_create - Create new wallet (requires unlocked store)
• wallet_import - Import private key (requires unlocked store)
• wallet_delete - Delete wallet (requires unlocked store)
• wallet_security - Configure auto-lock timeout

Cache Operations

• cache_search - Fast FTS5 search
• cache_refresh - Force refresh
• cache_stats - Cache statistics
• cache_sync_status - Sync status

Solana-Specific

• solana_atom_stats_get - ATOM metrics
• solana_atom_stats_initialize - Init ATOM account (write)
• solana_trust_tier_get - Trust tier
• solana_enriched_summary_get - Combined metrics
• solana_agent_wallet_get - Get operational wallet
• solana_sign - Sign with agent wallet
• solana_verify - Verify signature
• solana_validation_request - Request validation (write)
• solana_validation_respond - Respond to validation (write)
• solana_validation_read - Read validation
• solana_validation_wait - Wait for response
• solana_validation_pending_get - Pending validations
• solana_integrity_verify - O(1) integrity check
• solana_integrity_verify_deep - Deep verification

EVM-Specific

• evm_agent_wallet_set - Set operational wallet (write)
• evm_agent_wallet_unset - Remove operational wallet (write)

x402 Protocol

• x402_identity_build - Build agent identity
• x402_proof_parse - Parse payment proof
• x402_feedback_build - Build feedback file
• x402_feedback_submit - Submit with proof (write)

Configuration & Health

• config_get - Current config
• config_set - Update config
• config_reset - Reset to defaults
• network_get - Network status
• network_set - Switch network
• health_check - System health (server, chains, wallet store, cache)
• faucet_info - Testnet faucet URLs and funding info

OASF Standards

• oasf_list_skills - Valid skill slugs
• oasf_list_domains - Valid domain slugs
• oasf_list_tags - Feedback tags
• oasf_validate_skill - Validate skill
• oasf_validate_domain - Validate domain
• oasf_validate_tag - Validate tag

Crawler

• crawler_fetch_mcp - Fetch MCP capabilities
• crawler_fetch_a2a - Fetch A2A agent card
• crawler_is_alive - Health check

IPFS (Configured by default)

• ipfs_configure - Override default IPFS/Pinata settings (optional)
• ipfs_add_json - Store JSON (max 1MB)
• ipfs_add_registration - Store registration file
• ipfs_get_registration - Retrieve registration

Note: IPFS is pre-configured with a shared Pinata account. No setup required for basic usage.

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Claude Code Integration

This section is for Claude Code / AI assistants using 8004-MCP tools.

Intent Mapping

User Says	Tool	Notes
"find agents", "search for X"	agent_search or cache_search	Use cache_search for partial names
"agent details", "info on X"	agent_get	Pass global ID
"is X reliable?", "reputation"	reputation_get	Returns score + trust tier
"top agents", "best agents"	leaderboard_get	Chain optional
"reviews for X", "feedback"	feedback_list
"my wallets"	wallet_list
"switch to mainnet"	network_set	mode: 'mainnet'
"OASF skills/domains/tags"	oasf_list_*

DO NOT use web search for:

• Agent registry queries (use 8004 tools)
• Reputation/feedback lookups
• OASF standards
• x402 protocol

Search Strategy

1. Exact name known → agent_search with nameQuery
2. Partial name → cache_search (fuzzy FTS5)
3. By capabilities → agent_search with hasMcp, hasA2a, mcpTools, etc.
4. By owner → agent_search with owner

Write Operation Flow

1. Check wallet_store_status - is store initialized and unlocked?
2. If not initialized: wallet_store_init (save master password!)
3. If locked: wallet_store_unlock with master password
4. If no wallet: wallet_create for needed chain
5. Execute write operation
6. Report transaction hash on success