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Proton Bridge MCP vs Threadline MCP

A side-by-side look at the Proton Bridge MCP and Threadline MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.

Proton Bridge MCP logoProton Bridge MCPCommunication · Local subprocess (stdio)Read, organise and carefully-gated send for Proton Mail, without your mail leaving this machine.32EmergingAuth: not declaredThreadline MCP logoThreadline MCPCommunication · Local subprocess (stdio)Agent-to-agent messaging relay. Discover agents, send messages, and receive replies. Zero-config.49FairAuth: not declared

Verdict: choose Proton Bridge MCP for communication work as a local process; choose Threadline MCP for communication as a local process. You can also run both side by side in one mcpServers block.

Which MCP server should you choose?

Proton Bridge MCP logoChoose Proton Bridge MCP when

  • You need dedicated capabilities in the Communication domain.
  • You prefer a local stdio subprocess transport.
Explore Proton Bridge MCP

Threadline MCP logoChoose Threadline MCP when

  • You need dedicated capabilities in the Communication domain.
  • You prefer a local stdio subprocess transport.
Explore Threadline MCP

Feature & specification comparison

Rows where the two servers differ are marked.

SpecProton Bridge MCP logoProton Bridge MCPThreadline MCP logoThreadline MCP
CategoryCommunicationCommunication
Quality signal32/100 · Emerging49/100 · Fair
Install commandConfirmedConfirmed
TransportLocal subprocess (stdio)Local subprocess (stdio)
AuthNot declaredNot declared
PricingNot declaredNot declared
Required env varsNone listedNone listed
Verified ownerCommunity listingCommunity listing
GitHub stars184
Directory activity 0 views 0 installs 0 upvotes 3 views 0 installs 0 upvotes
ToolsNot listedNot listed
Full listingView Proton Bridge MCP View Threadline MCP

Tools & capabilities

Proton Bridge MCP tools

No tool names declared yet. Check the project README from the listing page.

Threadline MCP tools

No tool names declared yet. Check the project README from the listing page.

Ready-to-paste client configs

Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.

Proton Bridge MCP

mcpServers (Claude Desktop / Cursor)
{
  "mcpServers": {
    "proton-bridge-mcp": {
      "command": "uvx",
      "args": [
        "pypdf"
      ]
    }
  }
}

Threadline MCP

mcpServers (Claude Desktop / Cursor)
{
  "mcpServers": {
    "threadline-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "instar"
      ]
    }
  }
}

Frequently asked questions

Proton Bridge MCP is categorized under Communication and uses a local stdio subprocess. Threadline MCP belongs to Communication and uses a local stdio subprocess. Pick Proton Bridge MCP for communication work and Threadline MCP for communication.

Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.

Proton Bridge MCP has no declared pricing — check the project's own site. Threadline MCP has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.

Yes. MCP clients support multiple servers: add proton-bridge-mcp and threadline-mcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.

On AllMCPs, Proton Bridge MCP has a quality signal of 32/100 (Emerging) with 0 views, 0 installs and 1 GitHub stars. Threadline MCP has 49/100 (Fair) with 3 views, 0 installs and 84 GitHub stars.

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