Navigation

Articles

Career
Concepts
Events
Lifestyle
Organizations
People
Places
Projects

ContextArea

From Jan Wilmake's personal knowledge base

ContextArea

ContextArea (contextarea.com) is a web-based context engineering and MCP client tool developed by Jan Wilmake and launched publicly on February 11, 2026. It enables users to compose prompts using URLs as context, tag MCP servers inline, and run prompts against multiple AI models. Every result is instantly shareable via a unique URL.[1]

Core Concept

ContextArea is built around a simple but powerful paradigm:

  • URLs are context — paste any URL into the prompt area and it is fetched and included as context
  • MCP servers via @ — type @{mcp-url} to inject an MCP server's tools into the prompt
  • Shareable results — every prompt + result gets a unique, shareable URL at contextarea.com/...

Jan framed it as: "URLs are context, tag MCP servers in a whim — every result is instantly shareable — Fully MIT OSS."[1]

Features

  • Monaco editor — uses the Monaco (VSCode) code editor as its core input surface[2]
  • MCP marketplace — built-in discovery and one-click installation of MCP servers with name and icon support[1]
  • Image support — images can be dropped in and they render for models that support vision[3]
  • ContextArea as MCP — ContextArea is itself an MCP server, exposing tools to list activated MCPs and run sub-agents[3]
  • ContextArea API — exposes an API for creating experiences with URL-as-context and MCP-via-@ support[3]
  • Raw JS/CSS/HTML — the entire application uses no frontend framework; just Monaco + vanilla web[4]

Development History

DateMilestone
Early 2025First version: contextarea.com as a personal prompt tool
Oct 2025Used heavily in building Parallel MCP demos and sharing prompt+result links
Dec 2025Used for sharing context+rules links (e.g. contextarea.com/rules-...)
Jan 2026Used as identity provider development environment; Jan live-streamed building a remote MCP client with Parallel's styling
Feb 6, 2026Rebuilt with Monaco as core editor; added MCP server tagging
Feb 9, 2026MCP support added; becomes first ContextArea with MCP client
Feb 11, 2026Formal launch with video; MIT open-sourced
Feb 12, 2026ContextArea becomes an MCP itself; API launched

Source code: github.com/janwilmake/contextarea-worker[2]

Relationship to Other Projects

ContextArea integrates tightly with Jan's other tools:

  • Uses uithub API to load GitHub repository context
  • Supports LLMTEXT MCPs via @{mcp-url} syntax
  • Can invoke openapisearch OpenAPI MCPs
  • The "sharing" model inspired by and feeds into Jan's broader agent-friendly URL philosophy

See Also

Payment Integration Exploration

In February 2026, Jan explored integrating x402 machine payments into ContextArea — making it possible for AI agents to pay for MCP tools automatically. He noted: "I'm actually trying to build something and maybe integrate payments into it: contextarea.com", referencing an open MCP PR for payment support, and was seeking corporate sponsorship to fund the bandwidth costs this would entail.[5]

References

  1. X post archive: x-archive/raw/posts/2026-02-11.md ↑
  2. X post archive: x-archive/raw/posts/2026-02-06.md ↑
  3. X post archive: x-archive/raw/posts/2026-02-12.md ↑
  4. X post archive: x-archive/raw/posts/2026-02-10.md ↑
  5. X post archive: x-archive/raw/posts/2026-02-23.md ↑