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🧾 MIME Type for LLMFeed – application/llmfeed+json

🎯 Purpose​

Define and promote a dedicated MIME type for .llmfeed.json and .llmfeed-lite.json files:

Content-Type: application/llmfeed+json

This type enables smarter handling of LLM-specific context feeds by:

  • AI agents
  • HTTP APIs
  • developer tools
  • browsers

📦 What is a MIME type?​

A MIME (Multipurpose Internet Mail Extensions) type tells systems how to interpret a file based on its content and purpose.

For example:

  • application/json → raw JSON
  • application/xml → structured XML
  • text/html → web page

LLMFeed now defines its own specialized format: application/llmfeed+json

🧠 Why application/llmfeed+json matters​

  • Lets LLMs recognize a context file on sight
  • Allows VSCode extensions and syntax highlighters to activate
  • Enables secure and accurate routing of LLM feeds via APIs
  • Makes .llmfeed.json indexable by feed-aware search tools

🛠 Usage examples​

In HTTP headers (APIs or static files)​

Content-Type: application/llmfeed+json

In Node.js (Express)​

res.setHeader("Content-Type", "application/llmfeed+json");

In a curl upload​

curl -H "Content-Type: application/llmfeed+json" -d @llmfeed.json https://api.agent.com/context

📍 Scope of use​

  • .llmfeed.json (full version)
  • .llmfeed-lite.json (simplified version)
  • future .llmfeed.v2.json versions

⚠️ This type should only be used for LLM context capsules following the standard defined at wellknownmcp.org.

📬 Registration (future)​

This MIME type will be submitted to IANA for official registry as adoption grows.

Proposed by: wellknownmcp.org
Contact: opensource@wellknownmcp.org