Add projectId option to read a connected project's flags - #539
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September 30, 2026 09:41
…ources' into vincentderks/connected-project-id-option # Conflicts: # packages/vercel-flags-core/CLAUDE.md # packages/vercel-flags-core/src/black-box.test.ts
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Do not merge before the dashboard flow for project connections exists. Once released this is public API on a public repo. Stacked on #540.
A consumer project reads another project's flags by naming it:
createClient({ projectId })on@vercel/flags-coredoes the same. Reads use this deployment's OIDC token plusX-Vercel-Flags-Project-Id; the project must have been connected on the source side. CombiningprojectIdwith an SDK key throws, as does an id outside[A-Za-z0-9_]{1,64}.Tests: option on core and adapter (header and origin, invalid id, combined with an SDK key), and the source-header behaviour on stream, polling, ingest, bundled lookup and 401 messages.