[Bug] Teammate process crashes on permission prompt with Ink rendering error: <Box> nested in <Text>

Bug Description
Title: Spawned teammate crashes at startup with Ink error <Box> can't be nested
inside <Text> (v2.1.119, --teammate-mode tmux)

Version: 2.1.119
Platform: macOS 15.5 (Darwin 25.5.0), iTerm2 stable, zsh
Flags/env: CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1, launched with claude
--teammate-mode tmux
iTerm2: Python API enabled; it2 CLI v0.2.3 installed and working (it2 session list
returns sessions)

Summary:
Spawned teammates in --teammate-mode tmux crash at startup with an Ink rendering
error. The teammate process dies before doing any work, so the lead session sees
only silence — indistinguishable from a stuck agent. This has been masking as
"debate MCP hangs" and "Opus reasoning loops" in our debugging for multiple
sessions.

Crash:
ERROR <Box> can't be nested inside <Text> component
/$bunfs/root/src/entrypoints/cli.js:502:249

Stack:
createInstance (/$bunfs/root/src/entrypoints/cli.js:502:249)
PL (/$bunfs/root/src/entrypoints/cli.js:484:58456)
LYH (/$bunfs/root/src/entrypoints/cli.js:484:88642)
rZH (/$bunfs/root/src/entrypoints/cli.js:484:87842)
RD6 (/$bunfs/root/src/entrypoints/cli.js:484:86738)
iZH (/$bunfs/root/src/entrypoints/cli.js:484:86558)
jM_ (/$bunfs/root/src/entrypoints/cli.js:484:83272)
aH (/$bunfs/root/src/entrypoints/cli.js:484:6552)
LH (/$bunfs/root/src/entrypoints/cli.js:484:5006)
FH (/$bunfs/root/src/entrypoints/cli.js:484:5318)

Repro:

1. Launch CC with --teammate-mode tmux and CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1
2. TeamCreate({ team_name: "test", agent_type: "lead" })
3. Spawn teammate: Agent({ name: "x", team_name: "test", subagent_type:

"general-purpose", model: "haiku", run_in_background: true, prompt: "run python3 -c
'print(1)'" })

1. The teammate's first Bash call requires permission. The permission-prompt UI

triggers the Ink crash; the teammate pane dies.

In my reproducing case the teammate's first tool call was python3 << EOF ...
(market-hours detection). Any non-allowlisted Bash works.

Impact:

• Any Agent Teams workflow that's not fully pre-allowlisted crashes on first

permission prompt.

• The lead has no direct signal that the teammate died — reads as a hang.
• Existing silence-watchdogs (15+ min thresholds) misdiagnose as stuck-agent and

retry, compounding confusion.

• Debugging assumed Opus reasoning loops / MCP hangs; actual cause was this crash.

Requests:

1. Fix the Ink layout on the permission-prompt / startup path — <Box> is nested

inside <Text> somewhere in that component tree.

1. When a teammate exits unexpectedly, emit a TEAMMATE_CRASHED system message to

the lead's inbox with exit code + last stderr. Right now crash and silence are
indistinguishable from the lead side.

1. Optional: ship source maps / a less-minified build so cli.js:502:249 is

actionable.

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.119
• Feedback ID: 7244c4f7-de93-4d77-b2c1-af8f7fed762d

Errors

[{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at TWH (/$bunfs/root/src/entrypoints/cli.js:2736:30496)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-24T03:33:53.938Z"},{"error":"Error: Tool mcp__PAL__listmodels not found\n    at Uj7 (/$bunfs/root/src/entrypoints/cli.js:3077:31268)\n    at kz (/$bunfs/root/src/entrypoints/cli.js:484:21134)\n    at P1 (/$bunfs/root/src/entrypoints/cli.js:484:39900)\n    at M9H (/$bunfs/root/src/entrypoints/cli.js:484:50713)\n    at rZH (/$bunfs/root/src/entrypoints/cli.js:484:87780)\n    at RD6 (/$bunfs/root/src/entrypoints/cli.js:484:86738)\n    at iZH (/$bunfs/root/src/entrypoints/cli.js:484:86558)\n    at jM_ (/$bunfs/root/src/entrypoints/cli.js:484:82889)\n    at aH (/$bunfs/root/src/entrypoints/cli.js:484:6552)\n    at LH (/$bunfs/root/src/entrypoints/cli.js:484:5006)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:18721:2361)","timestamp":"2026-04-24T03:33:55.083Z"},{"error":"Error: Tool mcp__debate__listmodels not found\n    at Uj7 (/$bunfs/root/src/entrypoints/cli.js:3077:31268)\n    at kz (/$bunfs/root/src/entrypoints/cli.js:484:21134)\n    at P1 (/$bunfs/root/src/entrypoints/cli.js:484:39900)\n    at M9H (/$bunfs/root/src/entrypoints/cli.js:484:50713)\n    at rZH (/$bunfs/root/src/entrypoints/cli.js:484:87780)\n    at RD6 (/$bunfs/root/src/entrypoints/cli.js:484:86738)\n    at iZH (/$bunfs/root/src/entrypoints/cli.js:484:86558)\n    at jM_ (/$bunfs/root/src/entrypoints/cli.js:484:82889)\n    at aH (/$bunfs/root/src/entrypoints/cli.js:484:6552)\n    at LH (/$bunfs/root…

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