src/mcplocal/src/http/project-mcp-endpoint.ts

@@ -62,21 +62,31 @@ export function registerProjectMcpEndpoint(app: FastifyInstance, mcpdClient: Mcp
       return existing.router;
     }
 
+    // HTTP-mode mcplocal has no pod-level credentials — the default
+    // `mcpdClient.token` is an empty string. Every downstream call from this
+    // request (upstream discovery, LLM config fetch, prompt index for
+    // begin_session) has to use the CALLER's McpToken as the bearer, or mcpd
+    // rejects with 401. Build one per-request client here and thread it
+    // everywhere instead of sprinkling `.withToken(authToken)` at each call site.
+    const requestClient = authToken ? mcpdClient.withToken(authToken) : mcpdClient;
+
     // Create new router or refresh existing one
     const router = existing?.router ?? new McpRouter();
     await refreshProjectUpstreams(router, mcpdClient, projectName, authToken);
 
     // Resolve project LLM model: local override → mcpd recommendation → global default
     const localOverride = loadProjectLlmOverride(projectName);
-    const mcpdConfig = await fetchProjectLlmConfig(mcpdClient, projectName);
+    const mcpdConfig = await fetchProjectLlmConfig(requestClient, projectName);
     const resolvedModel = localOverride?.model ?? mcpdConfig.llmModel ?? undefined;
 
     // If project llmProvider is "none", disable LLM for this project
     const llmDisabled = mcpdConfig.llmProvider === 'none' || localOverride?.provider === 'none';
     const effectiveRegistry = llmDisabled ? null : (providerRegistry ?? null);
 
-    // Configure prompt resources with SA-scoped client for RBAC
+    // Configure prompt resources with SA-scoped client for RBAC.
-    const saClient = mcpdClient.withHeaders({ 'X-Service-Account': `project:${projectName}` });
+    // Keep the X-Service-Account header for mcpd-side audit tagging, but carry
+    // the caller's bearer so auth passes (the principal resolves as McpToken:<sha>).
+    const saClient = requestClient.withHeaders({ 'X-Service-Account': `project:${projectName}` });
     router.setPromptConfig(saClient, projectName);
 
     // System prompt fetcher for LLM consumers (uses router's cached fetcher)

src/mcplocal/tests/project-mcp-endpoint.test.ts

@@ -30,9 +30,13 @@ function mockMcpdClient() {
     delete: vi.fn(),
     forward: vi.fn(async () => ({ status: 200, body: [] })),
     withHeaders: vi.fn(),
+    withToken: vi.fn(),
+    withTimeout: vi.fn(),
   };
-  // withHeaders returns a new client-like object (returns self for simplicity)
+  // Chainable withX returns the same client for simplicity
   (client.withHeaders as ReturnType<typeof vi.fn>).mockReturnValue(client);
+  (client.withToken as ReturnType<typeof vi.fn>).mockReturnValue(client);
+  (client.withTimeout as ReturnType<typeof vi.fn>).mockReturnValue(client);
   return client;
 }