LangChain
./ConnectFramework and integrations for LLM apps and agents, with LangSmith and LangGraph alongside
OpenAPI
$ protocol support
[✗]MCP Server
[✓]OpenAPI Spec
[✗]Skill File
[✗]llms.txt
[✗]Structured Feed
$ payment protocols
none documented — this service is not reachable over an agent payment protocol
$ agent access
authAPI Key
onboardingPartial — dashboard signup, then API key
tosExplicitly welcomes bots
webhooksYes
free tierYes
billingsubscription
#agents#framework#integrations#open-source
https://www.langchain.com
// last verified 8/19/2026
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