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transfer

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upload.83blue.com

Free no-signup file transfer, handoff & scratchpad memory for AI agents. Share files by url.

https://upload.83blue.com/mcpWebsiteNo authMCP 2025-06-18v1.0.0last checked 18 Oct 2026spoke MCP on 100% of 84 checks (30 days)initialize in 62 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http transfer https://upload.83blue.com/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://upload.83blue.com/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://upload.83blue.com/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "transfer": {
      "url": "https://upload.83blue.com/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "transfer": {
      "type": "http",
      "url": "https://upload.83blue.com/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 18 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Handshake succeeds; 9 tools listable
Credentials demanded in prose	✕deploy_site These tools are listed anonymously and their own descriptions ask for an account or key, but no challenge is issued — so a client has nothing to act on and the refusal arrives as a tool error.

What the probe found

warningTools needing credentials are listed without a challenge

1 of the 9 tools listed anonymously say in their own descriptions that they need an account or a key (deploy_site), but the endpoint issued no WWW-Authenticate challenge. The requirement is stated only in prose, so a call reaches the tool and comes back as a tool error instead of an authorization step.

Tools

delete_sitedeploy_sitelist_sitesrecallreceive_fileremembershare_conversationshare_fileshare_text

Contract history

8 Oct 2026v1.0.0no contract changes

12 Sep 2026v1.0.02 compatible1 cosmeticinstructions rewritten

Instructions rewritten: receive_file. The description an agent follows changed; the callable contract may not have.

12 Sep 2026v1.0.02 cosmeticinstructions rewritten

Instructions rewritten: deploy_site. The description an agent follows changed; the callable contract may not have.

12 Sep 2026v1.0.03 compatible

2 Sep 2026v1.0.0first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/transfer/badge.svg)](https://mcpi.app/servers/transfer)