The Blekline extension masks prompts in-browser before send — complementary to MCP (IDE/agent path).
Supported surfaces
ChatGPT, Claude, Gemini, Perplexity, Grok, Poe, DeepSeek (see extension manifest host permissions).
Architecture
Content script → background.ts → @blekline/client → POST /api/mask
Enterprise private tenant: set PLASMO_PUBLIC_BLEKLINE_APP_ORIGIN.
vs MCP
| Surface | Best for |
|---|---|
| Extension | Browser SaaS chat UIs |
| MCP server | Cursor, Claude Desktop, Codex |
| MCP proxy | Tool-call governance before Daytona |
Use both for full coverage: browser wedge + IDE ingress + runtime sandbox (Daytona).
Next steps: AI Enablement Stack · Quick start · MCP Cursor setup · Open workspace · Report issue