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feat: per-story model selection for Claude Code #124

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17 changes: 17 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,23 @@ Ralph only works if there are feedback loops:

Frontend stories must include "Verify in browser using dev-browser skill" in acceptance criteria. Ralph will use the dev-browser skill to navigate to the page, interact with the UI, and confirm changes work.

### Per-Story Model Selection (Claude Code)

When using `--tool claude`, you can specify a model per story by adding a `model` field:

```json
{
"id": "US-005",
"title": "Complex table reconstruction",
"model": "opus",
"notes": "Requires opus for complex multi-column table logic"
}
```

Ralph reads the `model` field from the next incomplete story and passes `--model` to the Claude CLI. Valid values: `sonnet`, `opus`, `haiku`, or full model IDs like `claude-opus-4-6`. Stories without a `model` field use the default model.

This lets you use a cheaper model (sonnet) for straightforward stories and reserve opus for complex ones, optimizing cost across a run.

### Stop Condition

When all stories have `passes: true`, Ralph outputs `<promise>COMPLETE</promise>` and the loop exits.
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3 changes: 2 additions & 1 deletion prd.json.example
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Expand Up @@ -14,7 +14,8 @@
],
"priority": 1,
"passes": false,
"notes": ""
"notes": "",
"model": ""
},
{
"id": "US-002",
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18 changes: 17 additions & 1 deletion ralph.sh
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Expand Up @@ -87,12 +87,28 @@ for i in $(seq 1 $MAX_ITERATIONS); do
echo " Ralph Iteration $i of $MAX_ITERATIONS ($TOOL)"
echo "==============================================================="

# Detect per-story model override from prd.json
# Reads the "model" field from the first story where passes is false
STORY_MODEL=""
STORY_ID=""
if [ -f "$PRD_FILE" ] && [[ "$TOOL" == "claude" ]]; then
STORY_MODEL=$(jq -r '[.userStories[] | select(.passes == false)] | sort_by(.priority) | first | .model // empty' "$PRD_FILE" 2>/dev/null || echo "")
STORY_ID=$(jq -r '[.userStories[] | select(.passes == false)] | sort_by(.priority) | first | .id // empty' "$PRD_FILE" 2>/dev/null || echo "")
if [ -n "$STORY_MODEL" ] && [ -n "$STORY_ID" ]; then
echo " Story $STORY_ID requests model: $STORY_MODEL"
fi
fi

# Run the selected tool with the ralph prompt
if [[ "$TOOL" == "amp" ]]; then
OUTPUT=$(cat "$SCRIPT_DIR/prompt.md" | amp --dangerously-allow-all 2>&1 | tee /dev/stderr) || true
else
# Claude Code: use --dangerously-skip-permissions for autonomous operation, --print for output
OUTPUT=$(claude --dangerously-skip-permissions --print < "$SCRIPT_DIR/CLAUDE.md" 2>&1 | tee /dev/stderr) || true
MODEL_FLAG=""
if [ -n "$STORY_MODEL" ]; then
MODEL_FLAG="--model $STORY_MODEL"
fi
OUTPUT=$(claude --dangerously-skip-permissions --print $MODEL_FLAG < "$SCRIPT_DIR/CLAUDE.md" 2>&1 | tee /dev/stderr) || true
fi

# Check for completion signal
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