Add specific people to a workflow through a manual source - THE "add selected to campaign" surface (valid on type=manual sources only; create one first if none exists). Runs the full entry pipeline synchronously per person, reading MySQL (never ES): person exists → not stoplisted (stoplist_entries + people.status) → within active_limit / coworkers_limit (over-cap people WAIT). A NEW person gets a workflow_records row pinned to the published version, sender pinned by rotation_strategy; a person ALREADY in the workflow is RE-ENTERED (existing record reused + reset to the top - deliberate re-run). Requires a published version (422 invalid_transition) and a non-archived workflow (409 conflict).

All-or-nothing input: any unknown people_sid → 422 relation_not_found and nobody is enrolled - resolve sids via people search first. NOT idempotent for already-enrolled people: each call re-runs them. result = THIS call's counts (entered / re_entered / blocked_stoplisted / blocked_limit / blocked_other) - relay them ("4 entered, 1 re-run, 1 blocked: stoplisted"); item = the source row after the call.

When NOT: a living audience that keeps growing (create a view/filter source with auto_add:true); removing an enrolled person (workflow-records exit); importing new contacts into the CRM (data-sources).

Contract:

• MCP tool add_workflow_source_people, registry package mcp.playtables/workflow_sources, mount playtables.workflows.
• Operation action, response envelope action.
• Flags: none.