openrouter-agent-migration

name	openrouter-agent-migration
description	Migration guide from @openrouter/sdk to @openrouter/agent for callModel, tool(), stop conditions, and agent features. This skill should be used when code imports callModel, tool(), or stop conditions from @openrouter/sdk and needs to migrate to @openrouter/agent.
version	1.0.0

Migrating from @openrouter/sdk to @openrouter/agent

Agent functionality (callModel, tool(), stop conditions, format converters, streaming helpers) has moved from @openrouter/sdk to the standalone @openrouter/agent package. The @openrouter/agent package includes its own OpenRouter client class, so you do not need @openrouter/sdk for agent use cases.

---

When This Applies

Migrate if your code imports any of these from @openrouter/sdk:

• callModel or uses client.callModel()
• tool() factory function
• Stop conditions: stepCountIs, hasToolCall, maxCost, maxTokensUsed, finishReasonIs
• Format converters: fromClaudeMessages, toClaudeMessage, fromChatMessages, toChatMessage
• Types: Tool, ToolWithExecute, ToolWithGenerator, ManualTool, CallModelInput, ModelResult

---

Quick Migration

Step 1: Install

npm install @openrouter/agent

If you only use agent features, you can remove @openrouter/sdk:

npm uninstall @openrouter/sdk
npm install @openrouter/agent

If you also use non-agent SDK features (models list, chat completions, credits, OAuth, API keys), keep both packages installed.

Step 2: Update Imports

The OpenRouter client class and client.callModel() pattern work identically. Only the import source changes:

- import OpenRouter from '@openrouter/sdk';
+ import { OpenRouter } from '@openrouter/agent';

The rest of your code stays the same:

const client = new OpenRouter({ apiKey: process.env.OPENROUTER_API_KEY });

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Hello!',
});

const text = await result.getText();

---

Complete Import Mapping

Client & callModel

Old	New
import OpenRouter from '@openrouter/sdk'	import { OpenRouter } from '@openrouter/agent'
import OpenRouter, { tool, stepCountIs } from '@openrouter/sdk'	import { OpenRouter } from '@openrouter/agent' import { tool } from '@openrouter/agent/tool' import { stepCountIs } from '@openrouter/agent/stop-conditions'

A standalone callModel function is also available for advanced use cases where a pre-existing OpenRouterCore instance is available:

import { callModel } from '@openrouter/agent/call-model';

// Requires an OpenRouterCore instance (from @openrouter/sdk/core)
const result = callModel(coreInstance, { model: 'openai/gpt-5-nano', input: 'Hello' });

For most use cases, prefer the client.callModel() method shown above.

Tool Creation

Old	New
import { tool } from '@openrouter/sdk'	import { tool } from '@openrouter/agent/tool'

Stop Conditions

Old	New
import { stepCountIs, hasToolCall, maxCost } from '@openrouter/sdk'	import { stepCountIs, hasToolCall, maxCost } from '@openrouter/agent/stop-conditions'
import { maxTokensUsed, finishReasonIs } from '@openrouter/sdk'	import { maxTokensUsed, finishReasonIs } from '@openrouter/agent/stop-conditions'

Types

Old	New
import type { Tool, ToolWithExecute, ToolWithGenerator, ManualTool } from '@openrouter/sdk/lib/tool-types'	import type { Tool, ToolWithExecute, ToolWithGenerator, ManualTool } from '@openrouter/agent/tool-types'
import type { CallModelInput } from '@openrouter/sdk/lib/async-params'	import type { CallModelInput } from '@openrouter/agent/async-params'
import { ModelResult } from '@openrouter/sdk/lib/model-result'	import { ModelResult } from '@openrouter/agent/model-result'

Format Converters

Old	New
import { fromClaudeMessages, toClaudeMessage } from '@openrouter/sdk'	import { fromClaudeMessages, toClaudeMessage } from '@openrouter/agent'
import { fromChatMessages, toChatMessage } from '@openrouter/sdk'	import { fromChatMessages, toChatMessage } from '@openrouter/agent'

Type Guards

Old	New
import { hasExecuteFunction, isGeneratorTool, isRegularExecuteTool } from '@openrouter/sdk'	import { hasExecuteFunction, isGeneratorTool, isRegularExecuteTool } from '@openrouter/agent/tool-types'

---

Before & After Example

Before (using @openrouter/sdk)

import OpenRouter, { tool, stepCountIs, hasToolCall } from '@openrouter/sdk';
import { z } from 'zod';

const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY,
});

const searchTool = tool({
  name: 'web_search',
  description: 'Search the web',
  inputSchema: z.object({ query: z.string() }),
  outputSchema: z.object({ results: z.array(z.string()) }),
  execute: async ({ query }) => {
    return { results: ['Result 1', 'Result 2'] };
  },
});

const finishTool = tool({
  name: 'finish',
  description: 'Complete the task',
  inputSchema: z.object({ answer: z.string() }),
  execute: async ({ answer }) => ({ answer }),
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  : ,
  : ,
  : [searchTool, finishTool],
  : [(), ()],
});

 text =  result.();

After (using @openrouter/agent)

import { OpenRouter } from '@openrouter/agent';
import { tool } from '@openrouter/agent/tool';
import { stepCountIs, hasToolCall } from '@openrouter/agent/stop-conditions';
import { z } from 'zod';

const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY,
});

const searchTool = tool({
  name: 'web_search',
  description: 'Search the web',
  inputSchema: z.object({ query: z.string() }),
  outputSchema: z.object({ results: z.array(z.string()) }),
  execute: async ({ query }) => {
    return { results: ['Result 1', 'Result 2'] };
  },
});

const finishTool = tool({
  name: 'finish',
  description: 'Complete the task',
  inputSchema: z.object({ answer: z.string() }),
  execute:  ({ answer }) => ({ answer }),
});

 result = client.({
  : ,
  : ,
  : ,
  : [searchTool, finishTool],
  : [(), ()],
});

 text =  result.();

The only changes are the three import lines at the top.

---

When to Keep @openrouter/sdk

Keep @openrouter/sdk installed if you use any of these non-agent features:

Feature	Access
Model listing	client.models.list()
Chat completions	client.chat.send()
Legacy completions	client.completions.generate()
Usage analytics	client.analytics.getUserActivity()
Credit balance	client.credits.getCredits()
API key management	client.apiKeys.list(), .create(), etc.
OAuth PKCE flow	client.oAuth.createAuthCode(), .exchangeAuthCodeForAPIKey()

For mixed projects, use @openrouter/sdk for these features and @openrouter/agent for agent features:

import OpenRouter from '@openrouter/sdk';               // SDK client for models, credits, etc.
import { OpenRouter as Agent } from '@openrouter/agent'; // Agent client for callModel
import { tool } from '@openrouter/agent/tool';
import { stepCountIs } from '@openrouter/agent/stop-conditions';

// Use SDK client for non-agent features
const sdkClient = new OpenRouter({ apiKey: process.env.OPENROUTER_API_KEY });
const models = await sdkClient.models.list();
const credits = await sdkClient.credits.getCredits();

// Use Agent client for callModel
const agent = new Agent({ apiKey: process.env.OPENROUTER_API_KEY });
const result = agent.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Hello!',
  tools: [myTool],
  stopWhen: stepCountIs(5),
});

---

New Features in @openrouter/agent

These features are only available in @openrouter/agent, not in @openrouter/sdk:

Shared Context Schema

Type-safe shared state across all tools in a conversation:

import { OpenRouter } from '@openrouter/agent';
import { z } from 'zod';

const client = new OpenRouter({ apiKey: '...' });

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Process this data',
  sharedContextSchema: z.object({
    userId: z.string(),
    sessionData: z.record(z.unknown()),
  }),
  context: {
    shared: { userId: '123', sessionData: {} },
  },
  tools: [myTool],
});

Tool Context

Tools can declare their own typed context and access shared context:

import { tool } from '@openrouter/agent/tool';
import { z } from 'zod';

const myTool = tool({
  name: 'my_tool',
  description: 'A tool with context',
  inputSchema: z.object({ query: z.string() }),
  contextSchema: z.object({ apiKey: z.string() }),
  execute: async (params, context) => {
    // context.local — this tool's own context
    // context.shared — shared context across all tools
    // context.setContext({ ... }) — update this tool's context
    // context.setSharedContext({ ... }) — update shared context
    return { result: 'done' };
  },
});

Tool Approval Flow

Require user approval before tool execution:

const dangerousTool = tool({
  name: 'delete_file',
  description: 'Delete a file',
  inputSchema: z.object({ path: z.string() }),
  requireApproval: true, // or a function: (toolCall, context) => boolean
  execute: async ({ path }) => { /* ... */ },
});

Turn Lifecycle Callbacks

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Complex task',
  tools: [myTool],
  onTurnStart: async (context) => {
    console.log(`Starting turn ${context.numberOfTurns}`);
  },
  onTurnEnd: async (context, response) => {
    console.log(`Turn ${context.numberOfTurns} complete`);
  },
});

---

All Subpath Exports

@openrouter/agent provides granular subpath imports:

Subpath	Exports
@openrouter/agent	Barrel: all exports below
@openrouter/agent/client	OpenRouter class
@openrouter/agent/call-model	callModel standalone function
@openrouter/agent/tool	tool() factory function
@openrouter/agent/tool-types	Tool, ToolWithExecute, ToolWithGenerator, ManualTool, type guards
@openrouter/agent/stop-conditions	stepCountIs, hasToolCall, maxCost, maxTokensUsed, finishReasonIs
@openrouter/agent/model-result	ModelResult response wrapper
@openrouter/agent/async-params	CallModelInput, hasAsyncFunctions, resolveAsyncFunctions
@openrouter/agent/anthropic-compat	fromClaudeMessages, toClaudeMessage
@openrouter/agent/chat-compat	fromChatMessages, toChatMessage
@openrouter/agent/conversation-state	createInitialState, updateState, appendToMessages
@openrouter/agent/next-turn-params	nextTurnParams utilities
@openrouter/agent/stream-transformers	extractUnsupportedContent, getUnsupportedContentSummary
@openrouter/agent/tool-context	buildToolExecuteContext,