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teernisse c5b1fb3a80 chore(plans): add input-history and model-selection plans

plans/input-history.md:
- Implementation plan for shell-style up/down arrow message history
  in SimpleInput, deriving history from session log conversation data
- Covers prop threading, history derivation, navigation state,
  keybinding details, modal parity, and test cases

plans/model-selection.md:
- Three-phase plan for model visibility and control: display current
  model, model picker at spawn, mid-session model switching via Zellij

plans/PLAN-tool-result-display.md:
- Updates to tool result display plan (pre-existing changes)

plans/subagent-visibility.md:
- Updates to subagent visibility plan (pre-existing changes)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-06 14:51:36 -05:00

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Model Selection & Display

Summary

Add model visibility and control to the AMC dashboard. Users can see which model each agent is running, pick a model when spawning, and switch models mid-session.

Models

Label	Value sent to Claude Code
Opus 4.6	`opus`
Opus 4.5	`claude-opus-4-5-20251101`
Sonnet 4.6	`sonnet`
Haiku	`haiku`

Step 1: Display Current Model

Surface context_usage.model in SessionCard.js.

Data already extracted by parsing.py (line 202) from conversation JSONL
Already available via /api/state in context_usage.model
Add model name formatter: claude-opus-4-5-20251101 -> Opus 4.5
Show in SessionCard (near agent badge or context usage area)
Shows null until first assistant message

Files: dashboard/components/SessionCard.js

Step 2: Model Picker at Spawn

Add model dropdown to SpawnModal.js. Pass to spawn API, which appends --model <value> to the claude command.

Extend /api/spawn to accept optional model param
Validate against allowed model list
Prepend --model {model} to command in AGENT_COMMANDS
Default: no flag (uses Claude Code's default)

Files: dashboard/components/SpawnModal.js, amc_server/mixins/spawn.py

Step 3: Mid-Session Model Switch

Dropdown on SessionCard to change model for running sessions via Zellij.

Send /model <value> to the agent's Zellij pane:

zellij -s {session} action write-chars "/model {value}" --pane-id {pane}
zellij -s {session} action write 10 --pane-id {pane}

New endpoint: POST /api/session/{id}/model with {"model": "opus"}
Only works when agent is idle (waiting for input). If mid-turn, command queues and applies after.

Files: dashboard/components/SessionCard.js, amc_server/mixins/state.py (or new mixin)

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