ctxt.io for agents

Share whatever your agent produces as auto-expiring links. This repo packages the ctxt.io MCP server for agent runtimes: a Claude Code plugin (MCP + share skill), a Codex plugin, a Cursor plugin, and install recipes for VS Code and claude.ai.

• MCP endpoint: https://ctxt.io/mcp (streamable HTTP, no auth, no account)
• Tools: create_context, read_context, delete_context
• Free expiries: 5m – 1d. ttl=30d and Pro options (name, password) cost $1 one-time; the tool result says how payment completes — a payment_url a human opens, plus any agent-payment capability the server currently advertises.

Claude Code (plugin — recommended)

/plugin marketplace add ctxt-io/ctxt-agents
/plugin install ctxt@ctxt

You get the MCP server and a share skill that teaches Claude when to share and how to produce good-looking HTML output (self-contained HTML + inline SVG — scripts are stripped server-side, so static only). The skill also registers the /ctxt:share slash command.

MCP server only, no plugin:

claude mcp add --transport http ctxt https://ctxt.io/mcp

Codex

Codex plugin (bundles the MCP server + the share skill; lives in codex/ctxt/ with a .codex-plugin/plugin.json manifest):

codex plugin marketplace add ctxt-io/ctxt-agents
codex plugin add ctxt@ctxt

MCP server only — add to ~/.codex/config.toml:

[mcp_servers.ctxt]
url = "https://ctxt.io/mcp"

Skill only — Codex loads skills from ~/.agents/skills (open Agent Skills format):

mkdir -p ~/.agents/skills
cp -r codex/ctxt/skills/share ~/.agents/skills/ctxt-share

Cursor

One-click install (opens Cursor with the server pre-filled):

Add to Cursor

Cursor plugin (bundles the MCP server + the share skill, which Cursor registers as /share; lives in cursor/ctxt/ with a .cursor-plugin/plugin.json manifest, and the repo root carries a .cursor-plugin/marketplace.json so the whole repo can be added as a marketplace):

Cursor → Settings → Tools & MCP → add marketplace → ctxt-io/ctxt-agents

MCP server only, by hand — add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

{
  "mcpServers": {
    "ctxt": { "url": "https://ctxt.io/mcp" }
  }
}

VS Code

Add to .vscode/mcp.json — note VS Code uses a top-level servers map, not mcpServers:

{
  "servers": {
    "ctxt": { "type": "http", "url": "https://ctxt.io/mcp" }
  }
}

claude.ai / Claude Desktop

Customize → Connectors → Add custom connector → https://ctxt.io/mcp (no auth).

Any other MCP client

Point it at https://ctxt.io/mcp: stateless streamable HTTP, plain JSON responses, no authentication.

Notes

• Links are bearer-accessible by default — anyone holding the URL can read them; password-protected (Pro) links additionally require the password. Don't share secrets.
• The delete_token returned at creation is a deletion capability. Treat it as a secret and keep it out of shared content.
• Releasing: bump version in all three plugin manifests together (Claude only updates installed plugins when the version changes) and tag the release; CI checks the manifests stay in sync.
• Docs: https://ctxt.io/mcp/docs · Terms: https://ctxt.io/tos · Privacy: https://ctxt.io/privacy
• Security reports: see SECURITY.md.

License

MIT