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Promptster

Official registry AI and agents

Test and compare prompts across any AI provider. Bring your own keys.

Source code Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http promptster 'https://www.promptster.dev/mcp' --header 'Authorization: <Promptster API key (pk_live_...) from promptster.dev/developer/api-keys>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "promptster": {
            "type": "http",
            "url": "https://www.promptster.dev/mcp",
            "headers": {
                "Authorization": "<Promptster API key (pk_live_...) from promptster.dev/developer/api-keys>"
            }
        }
    }
}

Frequently asked questions

What is Promptster?

Test and compare prompts across any AI provider. Bring your own keys.

How do I install Promptster?

It runs as a remote server. In Claude Code: claude mcp add --transport http promptster 'https://www.promptster.dev/mcp' --header 'Authorization: <Promptster API key (pk_live_...) from promptster.dev/developer/api-keys>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Promptster need an API key?

Yes. It expects Authorization, which you set in its configuration.

Is Promptster open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains Promptster?

It is published by promptsterhq. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.