"agent-designer" names no specific product, so these are candidate frameworks for designing and building AI agents. CrewAI offers agent and task design guidance for role, goal and backstory configuration 212, and Strands Agents is an open source toolkit for production agents in Python and TypeScript 4. Mastra provides a TypeScript framework for agents, workflows, memory and tools 515, and LangChain offers an open agent engineering platform with agent patterns and Deep Agents orchestrat
A question back: Which language or framework do you plan to build the agent in (for example TypeScript, Python or Go)?
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Sources
- 2CrewAIcrewai.com · read 2026-10-29
- 4Strands Agents | The open source toolkit for production AI agentsstrandsagents.com · read 2026-10-29
- 5TypeScript AI Framework for Agents and Apps | Mastramastra.ai · read 2026-10-29
- 7LangChain: the open agent platform to own your intelligencelangchain.com · read 2026-10-29
- 10Genkit | Google's open-source framework for AI apps & agentsgenkit.dev · read 2026-10-30
- 12design-agent: declares "design-agent" (the record we read and signed)unfragile.ai · read 2026-10-24
- 15mastra: declares "mastra" (the record we read and signed)unfragile.ai · read 2026-10-24
- 17Docs by LangChain: declares "langchain" (the record we read and signed)unfragile.ai · read 2026-10-24
- 20developing-genkit-dart: declares "developing-genkit-dart" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
microsoft-agent-framework · microsoft-agent-framework verified and signed
Create, update, refactor, explain, or review Microsoft Agent Framework solutions using shared guidance plus language-specific references for .NET and Python.
design-agent · design-agent verified and signed
CrewAI agent design and configuration. Use when creating, configuring, or debugging crewAI agents — choosing role/goal/backstory, selecting LLMs, assigning tools, tuning max_iter/max_rpm/max_execution_time, enabling planning/delegation, setting up knowledge sources, using guardrails, or configuring
· AgentsKit website read, tools not yet checked
Build agents without gluing many libraries together. A composable TypeScript foundation for runtime, tools, memory, RAG, and chat interfaces.
· Strands Agents website read, tools not yet checked
Strands is the open source toolkit for building production AI agents in Python and TypeScript: an agent harness and SDK, sandboxed shell, evals, and research labs.
mastra · mastra verified and signed
Comprehensive Mastra framework guide for building agents, workflows, tools, memory, workspaces, and storage with current APIs. Use for documentation lookup, API verification, TypeScript setup, common errors, migrations, and `mastra api` CLI tasks: inspect or call resources on local, Mastra platform,
authenticator · aigne-writers found in code, not yet checked
Authenticates user with a blocklet
langchain · Docs by LangChain verified and signed
Use when building AI agents, integrating language models with
copilotkit-agui · copilotkit-agui verified and signed
Use when building custom agent backends, implementing the AG-UI protocol, debugging streaming issues, or understanding how agents communicate with frontends. Covers event types, SSE transport, AbstractAgent/HttpAgent patterns, state synchronization, tool calls, and human-in-the-loop flows.
agent-elements · agent-elements verified and signed
Use whenever the user wants to build or modify a chat, agent, or tool-calling UI in a React 19 + Tailwind v4 project — especially if the code imports from `@/components/agent-elements/*` or the project has that folder on disk. Triggers: "agent chat", "tool call UI", "streaming chat", "plan approval"
developing-genkit-dart · developing-genkit-dart verified and signed
Generates code and provides documentation for the Genkit Dart SDK. Use when the user asks to build AI agents in Dart, use Genkit flows, or integrate LLMs into Dart/Flutter applications.
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