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@rembric/mcp-bridge

v0.30.0

Published

Zero-dependency stdio to Streamable HTTP MCP bridge for Rembric

Vulnerabilities

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Links

Git

Maintainers

susomejiassusomejias

Keywords

Readme

@rembric/mcp-bridge

A zero-dependency MCP stdio-to-Streamable-HTTP bridge for Rembric. It is started with npx -y @rembric/mcp-bridge@<exact-version> and takes no arguments.

Set REMBRIC_SERVER_URL (without /mcp) and REMBRIC_API_TOKEN in the process environment. REMBRIC_PROJECT_SLUG is an optional fallback. A .rembric file in the resolved project directory wins over that fallback. The directory is selected from CLAUDE_PROJECT_DIR, then PWD, then the current working directory. A valid .rembric slug wins over REMBRIC_PROJECT_SLUG; otherwise the bridge uses path-less /mcp.

The bridge forwards MCP frames without creating a second client handshake. It uses the path /mcp/<slug> when a valid slug is found, otherwise /mcp. Plain HTTP and HTTPS are both accepted. The /healthz version check is advisory and never prevents a connection.

Compatibility

The bridge replaces mcp-remote for standard stdio MCP hosts. Host-specific runs are recorded below; an unverified host is supported by the transport contract, not claimed as a measured host run.

| Host | Status and evidence | | ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Claude Code | Verified 2026-08-15 on Linux, Claude Code 2.1.233: initialize/clientInfo passthrough, normal tool call, one 404 recovery, and server-initiated roots/list relay were exercised against the recorded Streamable HTTP stub (measurements/gate-arms-run.log, gate-arm3-roots-relay.log). | | opencode | Supported, host run unverified: its plugin starts this exact stdio bridge; subprocess tests cover initialize passthrough, HTTP/SSE framing, and 404 recovery. | | Codex CLI | Supported, host run unverified: its manifest starts the same exact-pinned stdio bridge. | | Hermes Agent | Verified by operator configuration: Hermes requires the documented explicit mcp_servers.rembric.env map; the bridge works once that map is present. | | Pi | Not applicable: Pi has its own in-process MCP client and does not use this bridge. | | Windows | Supported, host run unverified: no Windows CI or recorded run exists. |