diff --git a/bin/prompt_envelope.py b/bin/prompt_envelope.py
index 988e44b..34222e1 100644
--- a/bin/prompt_envelope.py
+++ b/bin/prompt_envelope.py
@@ -10,6 +10,7 @@ Profiles tune the spawn recipe per job family; add new ones to PROFILES.
 """
 import json
 import re
+import hashlib
 
 BOX_API = "https://box.muse-dev.online/api/box"
 
@@ -155,27 +156,35 @@ def wrap(job_name, job_id, agent, target, rendered):
     profile = pick_profile(job_name)
     spawn = spawn_call(job_id, job_name, profile)
     follow = native_followup_call(job_id, job_name, profile, agent)
+    parts = job_id.split("-")
+    wo_id = parts[-1] if len(parts) > 1 and len(parts[-1]) >= 8 else hashlib.sha256(job_id.encode()).hexdigest()[:8]
+    session_name = f"work-{agent}-{wo_id}"
+    tmux_new = _tool("tmux.new", {"session": session_name, "command": "bash"})
+    tmux_send = _tool("tmux.send", {"session": session_name, "keys": "echo 'Starting task execution...'"})
     top = (
-        "WORK ORDER - ACTION REQUIRED, NOT INFORMATIONAL.\n"
-        "Your FIRST output must be tool calls, not prose. Start now:\n"
+        f"[WO:{wo_id}] WORK ORDER - ACTION REQUIRED, NOT INFORMATIONAL.\n"
+        "Your FIRST output must be tool calls, not prose. Run background commands via shared tmux:\n"
         "  1) %s\n"
         "  2) %s\n"
+        "  3) %s\n"
+        "  4) %s\n"
         "Each tool call returns a result message; keep going until the task is done.\n"
-        "---- TASK ----\n" % (spawn, follow)
+        "---- TASK ----\n" % (tmux_new, tmux_send, spawn, follow)
     )
     has_result = "[RESULT" in rendered
     bottom = (
         "\n---- END TASK ----\n"
         "REMINDER (importance: critical): work is only real if a tool call ran. "
-        "If you have not yet spawned subagents or set a follow-up timer, do it now:\n"
+        "Execute and inspect commands in your background tmux session or subagents:\n"
         "  %s\n"
         "  %s\n"
+        "  Capture output: [TOOL tmux.capture {\"session\": \"%s\", \"lines\": 30}]\n"
         "Native tools (preferred): cron.create (runonce/interval), cron.status, cron.view, cron.runs "
         "(truth about what ran), cron.run, subagent spawn; hooks.dry_run before hooks.enable. "
         "Native cron form: %s\n"
         "Box fallback tools: [TOOL health.check {}] [TOOL swarm.list {}] [TOOL swarm.status {\"swarm_id\": \"<id>\"}] "
         "[TOOL swarm.results {\"swarm_id\": \"<id>\"}] [TOOL quality.check {}]\n"
-        % (spawn, follow, native_followup_call(job_id, job_name, profile, agent))
+        % (spawn, follow, session_name, native_followup_call(job_id, job_name, profile, agent))
     )
     bottom += _box_surface_block(agent, job_name, job_id, target)
     if not has_result: