Agent0 SDK

Agent0 is the TypeScript SDK for agentic economies. It enables agents to register, advertise their capabilities and how to communicate with them, and give each other feedback and reputation signals. All this using blockchain infrastructure (ERC-8004) and decentralized storage, enabling permissionless discovery without relying on proprietary catalogues or intermediaries.

What Does Agent0 SDK Do?

Agent0 SDK enables you to:

- Create and manage agent identities - Register your AI agent on-chain with a unique identity, configure presentation fields (name, description, image), set wallet addresses, and manage trust models with x402 support
- Advertise agent capabilities - Publish MCP and A2A endpoints, with automated extraction of MCP tools and A2A skills from endpoints
- OASF taxonomies - Advertise standardized skills and domains using the Open Agentic Schema Framework (OASF) taxonomies for better discovery and interoperability
- Enable permissionless discovery - Make your agent discoverable by other agents and platforms using rich search by attributes, capabilities, skills, tools, tasks, and x402 support
- Build reputation - Give and receive feedback, retrieve feedback history, and search agents by reputation with cryptographic authentication
- Cross-chain registration - One-line registration with IPFS nodes, Pinata, Filecoin, or HTTP URIs
- Public indexing - Subgraph indexing both on-chain and IPFS data for fast search and retrieval

Release (1.5.2)

This release includes the unified agent discovery/search API.

For breaking changes and migration notes, see release_notes/RELEASE_NOTES_1.5.2.md (and prior notes in release_notes/).

Bug reports & feedback: GitHub: Report issues | Telegram: Agent0 channel | Email: team@ag0.xyz

Installation

$3

- Node.js 22 or higher
- npm or yarn package manager
- Private key for signing transactions (or run in read-only mode)
- Access to an Ethereum RPC endpoint (e.g., Alchemy, Infura)
- (Optional) IPFS provider account (Pinata, Filecoin, or local IPFS node)

$3

``bash
npm install agent0-sdk
`

To install a specific version explicitly:

`bash
npm install agent0-sdk@1.5.2
`

Note: This package is an ESM (ECMAScript Module) package. Use import statements in your code:

`typescript
import { SDK } from 'agent0-sdk';
`

$3

`bash
git clone https://github.com/agent0lab/agent0-ts.git
cd agent0-ts
npm install
npm run build
`

Note: The generated TypeScript types are created as part of npm run build (or manually with npm run codegen). Always use npm run build instead of running tsc directly.

Quick Start

$3

`typescript
import { SDK } from 'agent0-sdk';

// Initialize SDK with IPFS and subgraph
const sdk = new SDK({
chainId: 11155111, // Ethereum Sepolia testnet (use 1 for Ethereum Mainnet)
rpcUrl: process.env.RPC_URL!,
privateKey: process.env.PRIVATE_KEY ?? process.env.AGENT_PRIVATE_KEY, // Optional: for write operations
ipfs: 'pinata', // Options: 'pinata', 'filecoinPin', 'node'
pinataJwt: process.env.PINATA_JWT // For Pinata
// Subgraph URL auto-defaults from DEFAULT_SUBGRAPH_URLS
});
`

$3

In the browser you typically keep reads on your rpcUrl and use a wallet (EIP-1193) for writes.

`typescript
import { SDK } from 'agent0-sdk';
import { discoverEip6963Providers, connectEip1193 } from 'agent0-sdk/eip6963';

const providers = await discoverEip6963Providers();
if (providers.length === 0) throw new Error('No injected wallets found');

// Pick a wallet (UI selection recommended)
const { provider } = providers[0];
await connectEip1193(provider); // prompts user

const sdk = new SDK({
chainId: 11155111,
rpcUrl: 'https://sepolia.infura.io/v3/YOUR_PROJECT_ID',
walletProvider: provider,
});
`

$3

`typescript
// Create agent
const agent = sdk.createAgent(
'My AI Agent',
'An intelligent assistant for various tasks. Skills: data analysis, code generation.',
'https://example.com/agent-image.png'
);

// Configure endpoints (automatically extracts capabilities)
await agent.setMCP('https://mcp.example.com/'); // Extracts tools, prompts, resources
await agent.setA2A('https://a2a.example.com/agent-card.json'); // Extracts skills
agent.setENS('myagent.eth');

// Add OASF skills and domains (standardized taxonomies)
agent.addSkill('data_engineering/data_transformation_pipeline', true);
agent.addSkill('natural_language_processing/natural_language_generation/summarization', true);
agent.addDomain('finance_and_business/investment_services', true);
agent.addDomain('technology/data_science/data_science', true);

// Optionally set a dedicated agent wallet on-chain (requires new wallet signature).
// If you want agentWallet = owner wallet, you can skip this (contract sets initial value to owner).
// await agent.setWallet('0x...', { newWalletPrivateKey: process.env.NEW_WALLET_PRIVATE_KEY });
agent.setTrust(true, true, false); // reputation, cryptoEconomic, teeAttestation

// Add metadata and set status
agent.setMetadata({ version: '1.0.0', category: 'ai-assistant' });
agent.setActive(true);

// Register on-chain with IPFS
const registrationFile = await agent.registerIPFS();
console.log(Agent registered: ${registrationFile.agentId}); // e.g., "11155111:123"
console.log(Agent URI: ${registrationFile.agentURI}); // e.g., "ipfs://Qm..."
`

$3

`typescript
// Load existing agent for editing
const agent = await sdk.loadAgent('11155111:123'); // Format: "chainId:agentId"

// Edit agent properties
agent.updateInfo(undefined, 'Updated description with new capabilities', undefined);
await agent.setMCP('https://new-mcp.example.com/');

// Re-register to update on-chain
await agent.registerIPFS();
console.log(Updated: ${agent.agentURI});
`

$3

`typescript
// Unified search (single chain): agent filters + reputation filters in one call
const results = await sdk.searchAgents(
{
name: 'AI', // substring
mcpTools: ['code_generation'],
a2aSkills: ['python'],
active: true,
x402support: true,
feedback: { minValue: 80, tag: 'enterprise', includeRevoked: false },
},
{ sort: ['updatedAt:desc'] }
);

for (const agent of results) {
console.log(${agent.name}: ${agent.description});
console.log( Tools: ${agent.mcpTools?.join(', ')});
console.log( Skills: ${agent.a2aSkills?.join(', ')});
}

// Multi-chain search (SDK defaults include 1, 11155111, 137)
const multiChainResults = await sdk.searchAgents({ active: true, chains: [1, 11155111, 137] });

console.log(Found ${multiChainResults.length} agents across chains);

// Get single agent (read-only, faster)
// Supports chainId:agentId format
const agentSummary = await sdk.getAgent('11155111:123'); // explicit chainId:agentId
`

$3

`typescript
// Search across multiple chains
const results = await sdk.searchAgents({
active: true,
chains: [1, 11155111, 137] // Ethereum Mainnet, Ethereum Sepolia, Polygon Mainnet
});

// Search all configured chains
const allResults = await sdk.searchAgents({
active: true,
chains: 'all' // Searches all configured chains
});

// Search agents by feedback-derived reputation across chains (unified search)
const reputationResults = await sdk.searchAgents(
{ chains: [1, 11155111, 137], feedback: { minValue: 80, includeRevoked: false } }
);

// Get agent from specific chain
const agent = await sdk.getAgent('1:123'); // Ethereum Mainnet

// Search feedback for a specific agent (unchanged)
const feedbacks = await sdk.searchFeedback({ agentId: '1:123' }); // Ethereum Mainnet

// NEW: Search feedback given by a reviewer wallet (across all agents)
const givenFeedback = await sdk.searchFeedback({
reviewers: ['0x742d35cc6634c0532925a3b844bc9e7595f0beb7'],
});

// NEW: Search feedback across multiple agents at once
const multiFeedback = await sdk.searchFeedback({
agents: ['1:123', '1:456', '11155111:789'],
});

// Get reputation summary for agent on specific chain
const summary = await sdk.getReputationSummary('1:123'); // Ethereum Mainnet
`

$3

`typescript
// Optional: prepare an OFF-CHAIN feedback file (only needed for rich fields)
const feedbackFile = sdk.prepareFeedbackFile({
capability: 'tools',
name: 'code_generation',
skill: 'python',
context: { sessionId: 'abc' },
});

// Give feedback (on-chain fields are passed directly)
const tx = await sdk.giveFeedback(
'11155111:123',
85, // value (number|string)
'data_analyst', // tag1 (optional)
'finance', // tag2 (optional)
'https://api.example.com/feedback', // endpoint (optional on-chain)
feedbackFile // optional off-chain file
);
// Submitted-by-default: wait explicitly for confirmation to get a receipt + the domain result
const { receipt, result: feedback } = await tx.waitConfirmed();

// Search feedback
const feedbackResults = await sdk.searchFeedback(
{ agentId: '11155111:123', capabilities: ['tools'] },
{ minValue: 80, maxValue: 100 }
);

// Get reputation summary
const summary = await sdk.getReputationSummary('11155111:123');
console.log(Average value: ${summary.averageValue});
`

IPFS Configuration Options

`typescript
// Option 1: Filecoin Pin (free for ERC-8004 agents)
const sdk = new SDK({
chainId: 11155111,
rpcUrl: '...',
signer: privateKey,
ipfs: 'filecoinPin',
filecoinPrivateKey: 'your-filecoin-private-key'
});

// Option 2: IPFS Node
const sdk = new SDK({
chainId: 11155111,
rpcUrl: '...',
signer: privateKey,
ipfs: 'node',
ipfsNodeUrl: 'https://ipfs.infura.io:5001'
});

// Option 3: Pinata (free for ERC-8004 agents)
const sdk = new SDK({
chainId: 11155111,
rpcUrl: '...',
signer: privateKey,
ipfs: 'pinata',
pinataJwt: 'your-pinata-jwt-token'
});

// Option 4: HTTP registration (no IPFS)
const sdk = new SDK({ chainId: 11155111, rpcUrl: '...', signer: privateKey });
const regTx = await agent.registerHTTP('https://example.com/agent-registration.json');
await regTx.waitConfirmed();
`

Multi-Chain Support

The SDK supports querying agents across multiple blockchain networks:

- Ethereum Mainnet (Chain ID: 1)
- Ethereum Sepolia (Chain ID: 11155111)
- Polygon Mainnet (Chain ID: 137)

$3

Use chainId:agentId format to specify which chain an agent is on:

`typescript
// Get agent from specific chain
const agent = await sdk.getAgent('1:1234'); // Ethereum Mainnet

// Search feedback for agent on specific chain
const feedbacks = await sdk.searchFeedback({ agentId: '1:1234' }); // Ethereum Mainnet
const feedbacksDefault = await sdk.searchFeedback({ agentId: '11155111:1234' }); // Default chain

// Get reputation summary for agent on specific chain
const summary = await sdk.getReputationSummary('1:1234'); // Ethereum Mainnet
const summaryDefault = await sdk.getReputationSummary('1234'); // Uses default chain
`

$3

Search across multiple chains simultaneously:

`typescript
// Search across multiple chains
const result = await sdk.searchAgents({
active: true,
chains: [1, 11155111, 137] // Ethereum Mainnet, Ethereum Sepolia, Polygon Mainnet
});

// Search all configured chains
const allChainsResult = await sdk.searchAgents({
active: true,
chains: 'all' // Searches all configured chains
});

// Multi-chain feedback-derived reputation search (unified search)
const reputationResult = await sdk.searchAgents(
{ chains: [1, 11155111, 137], feedback: { minValue: 80, includeRevoked: false } }
);

// Search all chains for agents with reputation (unified search)
const allChainsReputation = await sdk.searchAgents(
{ chains: 'all', feedback: { minValue: 80, includeRevoked: false } }
);

// Pagination has been removed; multi-chain results are returned as a flat list.
`

$3

When you initialize the SDK, you specify a default chain. Agent IDs without a chainId: prefix use the default chain:

`typescript
const sdk = new SDK({
chainId: 11155111, // Default chain
rpcUrl: 'https://eth-sepolia.g.alchemy.com/v2/YOUR_KEY'
});

// Uses default chain (11155111)
const agent = await sdk.getAgent('1234'); // Equivalent to "11155111:1234"

// Explicitly specify different chain
const agent = await sdk.getAgent('1:1234'); // Ethereum Mainnet
`

OASF Taxonomies

The SDK includes support for the Open Agentic Schema Framework (OASF) taxonomies, enabling agents to advertise standardized skills and domains. This improves discoverability and interoperability across agent platforms.

$3

`typescript
// Add OASF skills (with optional validation)
agent.addSkill('advanced_reasoning_planning/strategic_planning', true);
agent.addSkill('data_engineering/data_transformation_pipeline', true);

// Add OASF domains (with optional validation)
agent.addDomain('finance_and_business/investment_services', true);
agent.addDomain('technology/data_science/data_visualization', true);

// Remove skills/domains
agent.removeSkill('old_skill');
agent.removeDomain('old_domain');
`

$3

OASF skills and domains appear in your agent's registration file:

`json
{
"endpoints": [
{
"name": "OASF",
"endpoint": "https://github.com/agntcy/oasf/",
"version": "v0.8.0",
"skills": [
"advanced_reasoning_planning/strategic_planning",
"data_engineering/data_transformation_pipeline"
],
"domains": [
"finance_and_business/investment_services",
"technology/data_science/data_science"
]
}
]
}
`

$3

The SDK includes complete OASF v0.8.0 taxonomy files:
- Skills: src/taxonomies/all_skills.json (136 skills)
- Domains: src/taxonomies/all_domains.json (204 domains)

Browse these files to find appropriate skill and domain slugs. For more information, see the OASF specification and release_notes/RELEASE_NOTES_0.31.md.

Unified Search Reference (Exhaustive)

The unified search API is:

`ts
const results = await sdk.searchAgents(filters?: SearchFilters, options?: SearchOptions);
// results: AgentSummary[]
`

$3

`ts
export interface FeedbackFilters {
hasFeedback?: boolean;
hasNoFeedback?: boolean;
includeRevoked?: boolean;
minValue?: number;
maxValue?: number;
minCount?: number;
maxCount?: number;
fromReviewers?: string[];
endpoint?: string; // substring match
hasResponse?: boolean;
tag1?: string;
tag2?: string;
tag?: string; // matches tag1 OR tag2
}
`

| Field | Semantics |
| --- | --- |
| hasFeedback / hasNoFeedback | Filter by whether the agent has any feedback |
| includeRevoked | Include revoked feedback entries in the pool used for filtering |
| minValue / maxValue | Threshold on average value over feedback matching the other feedback constraints (inclusive) |
| minCount / maxCount | Threshold on count over feedback matching the other feedback constraints (inclusive) |
| fromReviewers | Only consider feedback from these reviewer wallets |
| endpoint | Only consider feedback whose endpoint contains this substring |
| hasResponse | Only consider feedback that has at least one response (if supported) |
| tag1 / tag2 | Only consider feedback matching tag1/tag2 |
| tag | Shorthand: match either tag1 OR tag2 |

$3

`ts
export interface SearchFilters {
chains?: number[] | 'all';
agentIds?: string[];

name?: string; // substring
description?: string; // substring

owners?: string[];
operators?: string[];

hasRegistrationFile?: boolean;
hasWeb?: boolean;
hasMCP?: boolean;
hasA2A?: boolean;
hasOASF?: boolean;
hasEndpoints?: boolean;

webContains?: string;
mcpContains?: string;
a2aContains?: string;
ensContains?: string;
didContains?: string;

walletAddress?: string;

supportedTrust?: string[];
a2aSkills?: string[];
mcpTools?: string[];
mcpPrompts?: string[];
mcpResources?: string[];
oasfSkills?: string[];
oasfDomains?: string[];

active?: boolean;
x402support?: boolean;

registeredAtFrom?: Date | string | number;
registeredAtTo?: Date | string | number;
updatedAtFrom?: Date | string | number;
updatedAtTo?: Date | string | number;

hasMetadataKey?: string;
metadataValue?: { key: string; value: string };

keyword?: string;
feedback?: FeedbackFilters;
}
`

$3

`ts
export interface SearchOptions {
sort?: string[]; // e.g. ["averageValue:desc", "updatedAt:desc"]
semanticMinScore?: number; // keyword searches only
semanticTopK?: number; // keyword searches only
}
`

| Field | Semantics |
| --- | --- |
| sort | List of sort keys: "field:asc" or "field:desc" |
| semanticMinScore | Minimum semantic score cutoff (keyword searches only) |
| semanticTopK | Limits semantic prefilter size (semantic endpoint has no cursor) |

$3

`ts
export interface AgentSummary {
chainId: number;
agentId: string;
name: string;
image?: string;
description: string;
owners: string[];
operators: string[];
// Endpoint strings (present when advertised; not booleans)
mcp?: string;
a2a?: string;
web?: string;
email?: string;
ens?: string;
did?: string;
walletAddress?: string;
supportedTrusts: string[];
a2aSkills: string[];
mcpTools: string[];
mcpPrompts: string[];
mcpResources: string[];
oasfSkills: string[];
oasfDomains: string[];
active: boolean;
x402support: boolean;
createdAt?: number;
updatedAt?: number;
lastActivity?: number;
agentURI?: string;
agentURIType?: string;
feedbackCount?: number;
averageValue?: number;
semanticScore?: number;
extras: Record;
}
`

🚀 Coming Soon

- Support for validations
- Enhanced x402 payments
- Advanced reputation aggregation
- Import/Export to centralized catalogues

Examples

Complete working examples are available in the examples/ directory:

- quick-start.ts - Basic agent creation and registration
- agent-update.ts - Agent registration with IPFS
- feedback-usage.ts - Complete feedback flow with IPFS storage
- search-agents.ts - Agent search and discovery
- transfer-agent.ts` - Agent ownership transfer

Documentation

Full documentation is available at sdk.ag0.xyz, including:

- Installation Guide
- Agent Configuration
- Registration
- Search
- Feedback
- Key Concepts
- API Reference

License

Agent0 SDK is MIT-licensed public good brought to you by Marco De Rossi in collaboration with Consensys, 🦊 MetaMask and Agent0, Inc. We are looking for co-maintainers. Please reach out if you want to help.

Thanks also to Edge & Node (The Graph), Protocol Labs and Pinata for their support.