Anthropic open-sources the Model Context Protocol (MCP)
Confirmed
Importance: historic (5 of 5)The takeaway
Anthropic introduced MCP, an open standard for connecting AI assistants to data sources and tools; within a year it was adopted by OpenAI, Google, Microsoft and most AI developer tools, becoming the de facto agent–tool protocol.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- Historic (5 of 5)
- Last verified
- 29 September 2026
Your AI and this story
- GPT-6 AstraIn its training data
- Claude Opus 5.5In its training data
- Gemini 4 HydrogenIn its training data
- Grok 4.7In its training data
It happened before the cutoffs of all four assistants, so it can be in their training data.
Key facts
- Announced 25 November 2024 with SDKs and reference servers
- Client–server protocol exposing tools, resources and prompts
- OpenAI announced MCP support in March 2025; Google, Microsoft and others followed
- Donated to the Linux Foundation’s Agentic AI Foundation on 9 December 2025
What happened
Anthropic open-sourced a specification and SDKs so any application could expose context and actions to any LLM client.
Why it matters
Solved the N×M integration problem for agents and became core infrastructure of the agentic AI ecosystem.
Sources
3 sources from 3 sites. Numbers match the chips in the text.
3 sources: 3 primary
Primary
- Introducing the Model Context Protocol (Anthropic)anthropic.com, official
- Model Context Protocol documentationmodelcontextprotocol.io, docs
- modelcontextprotocol (GitHub)github.com, code
Changes
- Filed