How to integrate Ashby MCP with Mastra AI

This guide walks you through connecting Ashby to Mastra AI using the Composio tool router. By the end, you'll have a working Ashby agent that can list all candidates for open roles, post a new job opening for engineering, summarize candidates in interview stage through natural language commands. This guide will help you understand how to give your Mastra AI agent real control over a Ashby account through Composio's Ashby MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Ashby

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Ashby is an applicant tracking system that handles job postings, candidate management, and hiring analytics.

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Introduction

This guide will help you understand how to give your Mastra AI agent real control over a Ashby account through Composio's Ashby MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Ashby with

OpenAI Agents SDK Claude Agent SDK Claude Code Claude Cowork Codex OpenClaw Hermes CLI Google ADK LangChain Vercel AI SDK LlamaIndex CrewAI

TL;DR

Here's what you'll learn:

Set up your environment so Mastra, OpenAI, and Composio work together
Create a Tool Router session in Composio that exposes Ashby tools
Connect Mastra's MCP client to the Composio generated MCP URL
Fetch Ashby tool definitions and attach them as a toolset
Build a Mastra agent that can reason, call tools, and return structured results
Run an interactive CLI where you can chat with your Ashby agent

What is Mastra AI?

Mastra AI is a TypeScript framework for building AI agents with tool support. It provides a clean API for creating agents that can use external services through MCP.

Key features include:

MCP Client: Built-in support for Model Context Protocol servers
Toolsets: Organize tools into logical groups
Step Callbacks: Monitor and debug agent execution
OpenAI Integration: Works with OpenAI models via @ai-sdk/openai

What is the Ashby MCP server, and what's possible with it?

The Ashby MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Ashby account. It provides structured and secure access to your recruiting data, so your agent can perform actions like managing job postings, tracking candidate progress, scheduling interviews, and generating hiring reports on your behalf.

Automated job posting management: Easily create, update, or close job listings across your organization with direct agent assistance.
Candidate pipeline tracking: Have your agent fetch, organize, and update candidate progress through every stage of the hiring process.
Interview scheduling and coordination: Let your agent schedule interviews, send calendar invites, and manage interviewer assignments to streamline the process.
Data-driven hiring analytics: Generate reports and insights about your hiring funnel, candidate sources, and time-to-hire with a simple agent request.
Centralized communication with applicants: Enable your agent to send status updates, feedback, or reminders to candidates, keeping everyone in the loop automatically.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS

Prerequisites

Before starting, make sure you have:

Node.js 18 or higher
A Composio account with an active API key
An OpenAI API key
Basic familiarity with TypeScript

Getting API Keys for OpenAI and Composio

OpenAI API Key

Go to the OpenAI dashboard and create an API key.
You need credits or a connected billing setup to use the models.
Store the key somewhere safe.

Composio API Key

Log in to the Composio dashboard.
Go to Settings and copy your API key.
This key lets your Mastra agent talk to Composio and reach Ashby through MCP.

Install dependencies

bash

npm install @composio/core @mastra/core @mastra/mcp @ai-sdk/openai dotenv

Install the required packages.

What's happening:

@composio/core is the Composio SDK for creating MCP sessions
@mastra/core provides the Agent class
@mastra/mcp is Mastra's MCP client
@ai-sdk/openai is the model wrapper for OpenAI
dotenv loads environment variables from .env

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

COMPOSIO_API_KEY authenticates your requests to Composio
COMPOSIO_USER_ID tells Composio which user this session belongs to
OPENAI_API_KEY lets the Mastra agent call OpenAI models

Import libraries and validate environment

typescript

import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey as string,
});

What's happening:

dotenv/config auto loads your .env so process.env.* is available
openai gives you a Mastra compatible model wrapper
Agent is the Mastra agent that will call tools and produce answers
MCPClient connects Mastra to your Composio MCP server
Composio is used to create a Tool Router session

Create a Tool Router session for Ashby

typescript

async function main() {
  const session = await composio.create(
    composioUserID as string,
    {
      toolkits: ["ashby"],
    },
  );

  const composioMCPUrl = session.mcp.url;
  console.log("Ashby MCP URL:", composioMCPUrl);

What's happening:

create spins up a short-lived MCP HTTP endpoint for this user
The toolkits array contains "ashby" for Ashby access
session.mcp.url is the MCP URL that Mastra's MCPClient will connect to

Configure Mastra MCP client and fetch tools

typescript

const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      nasdaq: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

console.log("Fetching MCP tools from Composio...");
const composioTools = await mcpClient.getTools();
console.log("Number of tools:", Object.keys(composioTools).length);

What's happening:

MCPClient takes an id for this client and a list of MCP servers
The headers property includes the x-api-key for authentication
getTools fetches the tool definitions exposed by the Ashby toolkit

Create the Mastra agent

typescript

const agent = new Agent({
    name: "ashby-mastra-agent",
    instructions: "You are an AI agent with Ashby tools via Composio.",
    model: "openai/gpt-5",
  });

What's happening:

Agent is the core Mastra agent
name is just an identifier for logging and debugging
instructions guide the agent to use tools instead of only answering in natural language
model uses openai("gpt-5") to configure the underlying LLM

Set up interactive chat interface

typescript

let messages: AiMessageType[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end.\n");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: "> ",
});

rl.prompt();

rl.on("line", async (userInput: string) => {
  const trimmedInput = userInput.trim();

  if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
    console.log("\nGoodbye!");
    rl.close();
    process.exit(0);
  }

  if (!trimmedInput) {
    rl.prompt();
    return;
  }

  messages.push({
    id: crypto.randomUUID(),
    role: "user",
    content: trimmedInput,
  });

  console.log("\nAgent is thinking...\n");

  try {
    const response = await agent.generate(messages, {
      toolsets: {
        ashby: composioTools,
      },
      maxSteps: 8,
    });

    const { text } = response;

    if (text && text.trim().length > 0) {
      console.log(`Agent: ${text}\n`);
        messages.push({
          id: crypto.randomUUID(),
          role: "assistant",
          content: text,
        });
      }
    } catch (error) {
      console.error("\nError:", error);
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    console.log("\nSession ended.");
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});

What's happening:

messages keeps the full conversation history in Mastra's expected format
agent.generate runs the agent with conversation history and Ashby toolsets
maxSteps limits how many tool calls the agent can take in a single run
onStepFinish is a hook that prints intermediate steps for debugging

Complete Code

Here's the complete code to get you started with Ashby and Mastra AI:

typescript

import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({ apiKey: composioAPIKey as string });

async function main() {
  const session = await composio.create(composioUserID as string, {
    toolkits: ["ashby"],
  });

  const composioMCPUrl = session.mcp.url;

  const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      ashby: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

  const composioTools = await mcpClient.getTools();

  const agent = new Agent({
    name: "ashby-mastra-agent",
    instructions: "You are an AI agent with Ashby tools via Composio.",
    model: "openai/gpt-5",
  });

  let messages: AiMessageType[] = [];

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: "> ",
  });

  rl.prompt();

  rl.on("line", async (input: string) => {
    const trimmed = input.trim();
    if (["exit", "quit"].includes(trimmed.toLowerCase())) {
      rl.close();
      return;
    }

    messages.push({ id: crypto.randomUUID(), role: "user", content: trimmed });

    const { text } = await agent.generate(messages, {
      toolsets: { ashby: composioTools },
      maxSteps: 8,
    });

    if (text) {
      console.log(`Agent: ${text}\n`);
      messages.push({ id: crypto.randomUUID(), role: "assistant", content: text });
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main();

Conclusion

You've built a Mastra AI agent that can interact with Ashby through Composio's Tool Router. You can extend this further by:

Adding other toolkits like Gmail, Slack, or GitHub
Building a web-based chat interface around this agent
Using multiple MCP endpoints to enable cross-app workflows

TOOLS

Supported Tools

Every Ashby action and event your agent gets out of the box.

Add Candidate to Project

Add a candidate to a project in Ashby.

Add Candidate Tag

Add a tag to a candidate in Ashby.

Add Hiring Team Member

Add an Ashby user to a hiring team at the application, job, or opening level.

Add User to Interviewer Pool

Add a user to an interviewer pool.

Add Opening Job

Adds a job to an opening (job requisition) in Ashby ATS.

Add Opening Location

Tool to add a location to an opening (job requisition).

Anonymize Candidate

Anonymize a candidate by removing personally identifiable information.

Approve Offer

Approve an offer or a specific approval step within an offer's approval process.

Archive Department

Archive a department by its unique identifier.

Archive Interviewer Pool

Archive an interviewer pool in Ashby.

Archive Location

Archives a location or location hierarchy in Ashby.

Change Application Source

Change the source attribution of an application.

Change Application Stage

Move an application to a different interview stage in the hiring pipeline.

Create Application

Create a new job application by associating a candidate with a job opening in Ashby ATS.

Create Candidate

Create a new candidate in the system.

Create Candidate Note

Create a note on a candidate profile.

Create Candidate Tag

Create a new candidate tag in Ashby for categorizing and organizing candidates.

Create Custom Field

Create a new custom field in Ashby.

Create Department

Create a new department.

Create Interviewer Pool

Create a new interviewer pool.

Create Job

Create a new job opening in Ashby ATS.

Create Location

Create a new location or location hierarchy.

Create Offer

Create a new offer for a candidate in Ashby ATS.

Create Opening

Create a new opening (job requisition) in Ashby ATS.

Create Referral

Create a referral in Ashby ATS by submitting a referral form with candidate information.

Create Survey Request

Generate a survey request and receive a survey URL to send to a candidate.

Create Survey Submission

Create a new survey submission for a candidate's application.

Get API Key Info

Retrieve information about the current API key, including associated organization, user details, and permissions.

Get Application Info

Retrieve detailed information about a specific application by its ID.

Get Candidate Info

Retrieve detailed information about a specific candidate by their ID.

Get Custom Field Info

Retrieve detailed information about a specific custom field by its ID.

Get Department Info

Retrieve detailed information about a specific department by its ID.

Get Feedback Form Definition

Retrieve detailed information about a specific feedback form definition by its ID.

Get File Info

Retrieve the URL of a file associated with a candidate.

Get Interviewer Pool Info

Retrieve detailed information about a specific interviewer pool by its ID.

Get Interviewer User Settings

Get interviewer settings for a specific user by their ID.

Get Interview Info

Retrieve detailed information about a specific interview type by its ID.

Get Interview Stage Info

Tool to fetch interview stage details by ID.

Get Job Info

Retrieve detailed information about a specific job by its ID.

Get Job Interview Plan Info

Retrieve the interview plan information for a specific job.

Get Job Posting Info

Retrieve detailed information about a specific job posting by its ID.

Get Location Info

Retrieve detailed information about a specific location by its ID.

Get Offer Info

Retrieve detailed information about a specific offer by its ID.

Get Opening Info

Retrieve detailed information about a specific opening (job requisition) by its ID.

Get Referral Form

Fetches the default referral form or creates a default referral form if none exists.

Get Survey Form Definition

Retrieve detailed information about a specific survey form definition by its ID.

Get User Info

Retrieve detailed information about a specific user by their ID.

List Application Criteria Evaluations

Retrieve AI-generated criteria evaluations for an application.

List Application Feedback

Retrieve all feedback submissions for an application.

List Application Hiring Team Roles

Retrieve all available hiring team roles for applications in the organization.

List Application History

Retrieve the complete history of stage transitions for an application.

List Applications

Retrieve a list of applications with optional pagination and sync-token filtering for incremental updates.

List Approvals

Retrieve a list of approvals (offer approvals, job approvals, etc.

List Archive Reasons

Retrieve a list of all archive reasons.

List Brands

Retrieve a list of all brands for the organization.

List Candidate Client Info

Retrieve all client info records for a specific candidate with pagination support.

List Candidate Notes

Retrieve all notes for a specific candidate in Ashby.

List Candidate Projects

Retrieve all projects associated with a candidate.

List Candidates

Retrieve a list of candidates.

List Candidate Tags

Retrieve a list of all candidate tags in your Ashby account.

List Close Reasons

Lists all close reasons for jobs or openings.

List Communication Templates

Retrieve a list of all communication templates.

List Custom Fields

Retrieve a list of all custom field definitions configured in Ashby.

List Departments

Retrieve a list of all departments in the organization.

List Feedback Form Definitions

Retrieve all feedback form definitions from your Ashby organization.

List Hiring Team Roles

Retrieve a list of possible hiring team roles in the organization.

List Interviewer Pools

Retrieve a list of all interviewer pools.

List Interview Events

Retrieves all interview events for a specific interview schedule.

List Interview Plans

Retrieve a list of interview plans.

List Interview Types

List all interview types defined in Ashby.

List Interview Schedules

Retrieve a list of interview schedules.

List Interview Stage Groups

Retrieve a list of interview stage groups.

List Interview Stages

Retrieve all interview stages for an interview plan in order.

List Job Boards

Retrieve a list of job boards.

List Job Postings

Retrieve a list of job postings.

List Jobs

Retrieve a list of all jobs from Ashby ATS (Applicant Tracking System).

List Job Templates

Retrieve a list of all job templates from Ashby ATS.

List Locations

Retrieve a list of all locations.

List Offers

Retrieve a list of job offers with their latest versions.

List Openings

Retrieve a list of openings (job requisitions).

List Projects

Retrieve a list of all projects.

List Sources

Retrieve a list of all candidate sources.

List Source Tracking Links

Retrieve all source tracking links configured in Ashby.

List Survey Form Definitions

Retrieve a list of all survey form definitions from Ashby.

List Survey Submissions

Lists all survey submissions of a given survey type from Ashby.

List Users

Retrieve a list of all users in the organization.

Move Department

Tool to move a department to another parent in the organizational hierarchy.

Move Location

Tool to move a location to a different parent in the location hierarchy.

Remove Hiring Team Member

Remove an Ashby user from a hiring team at the application, job, or opening level.

Remove User from Interviewer Pool

Remove a user from an interviewer pool.

Remove Opening Job

Remove a job from an opening (job requisition) in Ashby ATS.

Remove Opening Location

Tool to remove a location from an opening (job requisition).

Restore Department

Restore an archived department by its unique identifier.

Restore Interviewer Pool

Restore an archived interviewer pool in Ashby.

Restore Location

Restores an archived location or location hierarchy in Ashby.

Search Candidates

Search for candidates by email or name.

Search Jobs

Search for jobs by title in Ashby ATS (Applicant Tracking System).

Search Opening

Search for openings by identifier.

Search Projects

Search for projects by title in Ashby.

Search Users

Search for an Ashby user by email address.

Set Custom Field Value

Set the value of a custom field for a given object (candidate, application, job, etc.

Set Custom Field Values

Set the values of multiple custom fields for a given object in a single call.

Set Job Status

Set the status of a job in Ashby ATS (Applicant Tracking System).

Set Opening Archived

Sets the archived state of an opening.

Set Opening State

Set the workflow state of an opening (job requisition).

Start Offer

Create a new offer version instance for an in-progress offer process.

Start Offer Process

Start an offer process for a candidate's application in Ashby ATS.

Submit Application Feedback

Submit structured feedback for an application using a feedback form.

Transfer Application

Transfer an application to a different job position in Ashby ATS.

Update Application

Update an application's properties in Ashby.

Update Application History

Update the complete history of an application's stage transitions.

Update Candidate

Update an existing candidate's profile information in Ashby ATS.

Update Job Compensation

Update a job's compensation tiers in Ashby ATS.

Update Department

Update an existing department's information such as its name.

Update Interviewer Pool

Update an existing interviewer pool's title or training requirements.

Update Job

Update an existing job's properties in Ashby ATS.

Update Job Posting

Update an existing job posting's details including title, description, and visibility status.

Update Location Address

Update the address of a location or location hierarchy.

Update Location External Name

Update a location's external (candidate-facing) name.

Update Location Name

Update a location's name.

Update Location Remote Status

Tool to update a location's remote status.

Update Location Workplace Type

Tool to update a location's workplace type (OnSite, Remote, or Hybrid).

Update Opening

Update properties of an existing opening (job requisition).

Update Selectable Values Custom Field

Update the selectable values for a ValueSelect or MultiValueSelect custom field.

Update User Interviewer Settings

Update interviewer settings for a user, including daily and weekly interview limits.

FRAMEWORKS

How to build Ashby MCP Agent with another framework

OpenAI Agents SDK

Use Ashby MCP with OpenAI Agents SDK

Claude Agent SDK

Use Ashby MCP with Claude Agent SDK

Claude Code

Use Ashby MCP with Claude Code

Claude Cowork

Use Ashby MCP with Claude Cowork

Codex

Use Ashby MCP with Codex

OpenClaw

Use Ashby MCP with OpenClaw

Hermes

Use Ashby MCP with Hermes

CLI

Use Ashby MCP with CLI

Google ADK

Use Ashby MCP with Google ADK

LangChain

Use Ashby MCP with LangChain

Vercel AI SDK

Use Ashby MCP with Vercel AI SDK

LlamaIndex

Use Ashby MCP with LlamaIndex

CrewAI

Use Ashby MCP with CrewAI

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

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Oauth2Api Key

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Breathe HR

Api Key

Breathe HR is cloud-based HR software for SMEs to manage employee data, absences, and performance. It simplifies HR admin, making it easy to keep employee records accurate and up to date.

Connecteam

Api Key

Connecteam is a workforce management platform for deskless teams, streamlining operations, HR, and team communication. It helps businesses save time by automating scheduling, time tracking, and staff engagement tasks.

FAQ

Frequently asked questions

With a standalone Ashby MCP server, the agents and LLMs can only access a fixed set of Ashby tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Ashby and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Mastra AI fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Ashby tools.

Yes, absolutely. You can configure which Ashby scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Ashby data and credentials are handled as safely as possible.

Start with Ashby.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Ashby tool your agent needs.Free to start.

Start building

Customer stories

Teams ship real agents on Composio

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Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati

Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya

Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave

CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu

Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola

Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche

Co-Founder, Ingram Technologies

How to integrate Ashby MCP with Mastra AI

Connect Ashby without auth hassles

Introduction

Also integrate Ashby with

TL;DR

What is Mastra AI?

What is the Ashby MCP server, and what's possible with it?

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for OpenAI and Composio

Install dependencies

Set up environment variables

Import libraries and validate environment

Create a Tool Router session for Ashby

Configure Mastra MCP client and fetch tools

Create the Mastra agent

Set up interactive chat interface

Complete Code

Conclusion

Supported Tools

How to build Ashby MCP Agent with another framework

OpenAI Agents SDK

Claude Agent SDK

Claude Code

Claude Cowork

Codex

OpenClaw

Hermes

CLI

Google ADK

LangChain

Vercel AI SDK

LlamaIndex

CrewAI

Explore Other Toolkits

Async interview

Bamboohr

Breathe HR

Connecteam

Frequently asked questions

What are the differences in Tool Router MCP and Ashby MCP?+

Can I use Tool Router MCP with Mastra AI?+

Can I manage the permissions and scopes for Ashby while using Tool Router?+

How safe is my data with Composio Tool Router?+

Start with Ashby.It takes 30 seconds.

Teams ship real agents on Composio