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fix(mcp): default container to authenticated userId when x-sm-project is absent (#792) #864

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fix(mcp): default container to authenticated userId when x-sm-project is absent (#792) #864

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10 changes: 9 additions & 1 deletion apps/mcp/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,7 @@ const mcpHandler = SupermemoryMCP.serve("/mcp", {
const handleMcpRequest = async (c: Context<{ Bindings: Bindings }>) => {
const authHeader = c.req.header("Authorization")
const token = authHeader?.replace(/^Bearer\s+/i, "")
const containerTag = c.req.header("x-sm-project")
const headerContainerTag = c.req.header("x-sm-project")
const apiUrl = c.env.API_URL || DEFAULT_API_URL

const reqHost = c.req.header("x-forwarded-host") || c.req.header("host") || ""
Expand Down Expand Up @@ -174,6 +174,14 @@ const handleMcpRequest = async (c: Context<{ Bindings: Bindings }>) => {
)
}

// Default to the authenticated user's id when no explicit project header is
// provided. Without this fallback all MCP sessions share the hard-coded
// `sm_project_default` container inside SupermemoryClient, which is not the
// container the user's direct /v3 and /v4 API calls query — causing writes
// via MCP to be invisible to reads via the REST API and MCP `recall` when
// the client doesn't forward x-sm-project. See issue #792.
const containerTag = headerContainerTag || authUser.userId

// Create execution context with authenticated user props
const ctx = {
...c.executionCtx,
Expand Down