LangChain
./ConnectFramework and platform for building LLM-powered apps
OpenAPI
$ protocol support
[✗]MCP Server
[✓]OpenAPI Spec
[✗]Accepts MPP
[✗]Accepts x402
[✗]Supports ACP
[✗]Supports UCP
[✗]Skill File
[✗]Plugin Manifest
[✗]llms.txt
[✗]Structured Feed
[✗]Agent Protocol
$ agent access
authAPI Key
onboardingPartial — dashboard signup, then API key
tosExplicitly welcomes bots
webhooksYes
free tierYes
billingsubscription
#agents#llm#framework#open-source
https://www.langchain.com