Add ERC-8004 plugin docs to SDK reference

sdk/create-client.mdx

@@ -96,6 +96,85 @@ const extended = client.extend(
 const payments = await extended.query.getPayerPayments(payerAddress)
 ```
 
+### ERC-8004 plugin
+
+The `erc8004Actions()` plugin adds on-chain identity, reputation, and service discovery. Registry addresses are resolved automatically from the chain config, but you can override them via options.
+
+```typescript
+import { createX402r, erc8004Actions } from '@x402r/sdk'
+
+const client = createX402r({ publicClient, walletClient, operatorAddress: '0x...' })
+  .extend(erc8004Actions())
+
+// Identity
+const isReg = await client.identity.isRegistered('0xABC...')
+const txHash = await client.identity.register('https://example.com/agent.json')
+const verified = await client.identity.verifyAgentId(7n, '0xABC...')
+const agent = await client.identity.resolveAgent(7n)
+
+// Reputation
+await client.reputation.rate(7n, 90)
+const summary = await client.reputation.getSummary(7n, ['0xReviewer1...'])
+await client.reputation.giveFeedback(7n, {
+  value: 500n,
+  valueDecimals: 2,
+  tag1: 'quality',
+  tag2: 'x402',
+})
+
+// Discovery
+const endpoint = await client.discovery.resolveServiceEndpoint(7n, 'x402r.arbiter')
+```
+
+<Tip>
+`rate()` is a convenience wrapper around `giveFeedback()` that accepts a 0-100 integer score and uses the default tags (`starred` / `x402`). Use `giveFeedback()` when you need custom tags or decimal precision.
+</Tip>
+
+#### Plugin options
+
+| Option | Type | Default | Description |
+|--------|------|---------|-------------|
+| `registryAddress` | `Address` | Auto-resolved | Identity registry address override |
+| `reputationRegistryAddress` | `Address` | Auto-resolved | Reputation registry address override |
+| `defaultTag1` | `string` | `'starred'` | Default `tag1` for `rate()` and `getSummary()` |
+| `defaultTag2` | `string` | `'x402'` | Default `tag2` for `rate()` and `getSummary()` |
+
+#### Identity methods
+
+| Method | Parameters | Returns | Description |
+|--------|-----------|---------|-------------|
+| `register` | `agentURI?: string` | `Hash` | Register the connected wallet as an agent |
+| `verifyAgentId` | `agentId: bigint, claimedAddress: Address` | `boolean` | Check if an agent ID belongs to the claimed address |
+| `resolveAgent` | `agentId: bigint` | `ResolvedAgent` | Look up full agent record by ID |
+| `isRegistered` | `address: Address` | `boolean` | Check if an address is registered |
+
+#### Reputation methods
+
+| Method | Parameters | Returns | Description |
+|--------|-----------|---------|-------------|
+| `rate` | `agentId: bigint, score: number` | `Hash` | Submit a 0-100 rating using default tags |
+| `getSummary` | `agentId: bigint, reviewers: Address[], options?` | `ReputationSummary` | Aggregate reputation from specific reviewers |
+| `giveFeedback` | `agentId: bigint, params: Erc8004GiveFeedbackParams` | `Hash` | Submit feedback with full control over tags and metadata |
+
+#### Discovery methods
+
+| Method | Parameters | Returns | Description |
+|--------|-----------|---------|-------------|
+| `resolveServiceEndpoint` | `agentId: bigint, serviceName: string` | `ResolvedServiceEndpoint` | Resolve an agent's service endpoint by name |
+
+#### Re-exported types
+
+The following types from `@x402r/erc8004` are re-exported by `@x402r/sdk` for convenience:
+
+- `ResolvedAgent` - full agent identity record
+- `ReputationSummary` - aggregated reputation data
+- `ResolvedServiceEndpoint` - resolved service endpoint record
+- `Erc8004PluginOptions` - plugin configuration
+- `Erc8004GiveFeedbackParams` - parameters for `giveFeedback()`
+- `Erc8004IdentityActions` - identity namespace type
+- `Erc8004ReputationActions` - reputation namespace type
+- `Erc8004DiscoveryActions` - discovery namespace type
+
 ## Next Steps
 
 <CardGroup cols={3}>

sdk/overview.mdx

@@ -32,7 +32,7 @@ bun add @x402r/sdk
 ```
 </CodeGroup>
 
-`@x402r/sdk` is the only package most developers need. It includes role-scoped client factories, 8 action groups (payment, escrow, refund, evidence, freeze, query, operator, watch), and an `.extend()` plugin system.
+`@x402r/sdk` is the only package most developers need. It includes role-scoped client factories, 8 action groups (payment, escrow, refund, evidence, freeze, query, operator, watch), and an `.extend()` plugin system. The `erc8004Actions()` plugin adds on-chain identity, reputation, and service discovery via [ERC-8004](/sdk/create-client#erc-8004-plugin).
 
 For low-level access to contract ABIs and deploy utilities: