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+---
+name: ax-flow
+description: This skill helps an LLM generate correct AxFlow workflow code using @ax-llm/ax. Use when the user asks about flow(), AxFlow, workflow orchestration, parallel execution, DAG workflows, conditional routing, map/reduce patterns, or multi-node AI pipelines.
+version: "19.0.33"
+---
+
+# AxFlow Codegen Rules (@ax-llm/ax)
+
+Use this skill to generate `AxFlow` workflow code. Prefer short, modern, copyable patterns. Do not write tutorial prose unless the user explicitly asks for explanation.
+
+## Use These Defaults
+
+- Use `flow()` factory, not `new AxFlow()`.
+- Import: `import { ai, flow, f } from '@ax-llm/ax';`
+- `autoParallel: true` is the default; independent executes run in parallel automatically.
+- Node results are stored as `${nodeName}Result` in state.
+- Always define `.node()` before `.execute()` for that node.
+- Use `.returns()` (or `.r()`) as the last step to lock the output type.
+- Use descriptive node names: `documentSummarizer`, not `proc1`.
+- Use descriptive field names: `userInput`, `responseText`, not `text`, `result`.
+
+## Critical Rules
+
+- Use `flow()` factory syntax for new code.
+- Node results in state follow the pattern `state.${nodeName}Result.${fieldName}`.
+- `.execute()` maps current state to node inputs; `.map()` transforms state without AI calls.
+- `.returns()` maps final state to the flow output type.
+- Always define nodes before executing them; reversed order throws at runtime.
+- Keep state flat; avoid deep nesting in `.map()`.
+- Ensure loop conditions can change to avoid infinite loops.
+- Structure independent executes to maximize auto-parallelization.
+- Use `flow<InputType, OutputType>()` for typed flows.
+- Aliases: `.n()` = `.node()`, `.nx()` = `.nodeExtended()`, `.m()` = `.map()`, `.r()` = `.returns()`.
+
+## Canonical Pattern
+
+```typescript
+import { ai, flow } from '@ax-llm/ax';
+
+const llm = ai({ name: 'openai', apiKey: process.env.OPENAI_APIKEY! });
+
+const wf = flow<{ userInput: string }, { responseText: string }>()
+  .node('testNode', 'userInput:string -> responseText:string')
+  .execute('testNode', (state) => ({ userInput: state.userInput }))
+  .returns((state) => ({ responseText: state.testNodeResult.responseText }));
+
+const result = await wf.forward(llm, { userInput: 'Hello world' });
+console.log(result.responseText);
+```
+
+## Factory Options
+
+```typescript
+// Basic
+const wf = flow();
+
+// With options
+const wf = flow({ autoParallel: false });
+
+// Typed
+const wf = flow<InputType, OutputType>();
+
+// Typed with options
+const wf = flow<InputType, OutputType>({ autoParallel: true, batchSize: 5 });
+```
+
+## State Evolution
+
+State grows with each executed node. Results are stored as `${nodeName}Result`:
+
+```typescript
+// Initial state: { userInput: 'Hello' }
+flow.execute('processor', (state) => ({ input: state.userInput }));
+// State: { userInput: 'Hello', processorResult: { output: '...' } }
+
+flow.execute('analyzer', (state) => ({ text: state.processorResult.output }));
+// State: { ..., analyzerResult: { sentiment: '...', confidence: 0.8 } }
+```
+
+## Node Definition
+
+```typescript
+// String signature (creates AxGen automatically)
+flow.node('processor', 'input:string -> output:string');
+
+// Multiple outputs
+flow.node('analyzer', 'text:string -> sentiment:string, confidence:number');
+
+// Array outputs
+flow.node('extractor', 'documentText:string -> entities:string[]');
+
+// Short alias
+flow.n('processor', 'input:string -> output:string');
+```
+
+## Extended Nodes (nx)
+
+Add fields to a base signature without rewriting it:
+
+```typescript
+import { f, flow } from '@ax-llm/ax';
+
+// Chain-of-thought reasoning
+flow.nx('reasoner', 'question:string -> answer:string', {
+  prependOutputs: [
+    { name: 'reasoning', type: f.internal(f.string('Step-by-step reasoning')) },
+  ],
+});
+
+// Add confidence scoring
+flow.nx('analyzer', 'input:string -> result:string', {
+  appendOutputs: [{ name: 'confidence', type: f.number('Confidence 0-1') }],
+});
+
+// Add optional context input
+flow.nx('processor', 'query:string -> response:string', {
+  appendInputs: [{ name: 'context', type: f.optional(f.string('Extra context')) }],
+});
+```
+
+Extension options: `prependInputs`, `appendInputs`, `prependOutputs`, `appendOutputs`.
+
+## Execute With Input Mapping
+
+```typescript
+flow.execute('summarizer', (state) => ({ documentText: state.document }));
+
+// With AI override (use a different model for this node)
+flow.execute('processor', (state) => ({ input: state.data }), { ai: alternativeAI });
+```
+
+## Map (State Transformation)
+
+Use `map()` for data shaping without AI calls:
+
+```typescript
+// Sync
+flow.map((state) => ({ ...state, upperText: state.rawText.toUpperCase() }));
+
+// Async
+flow.map(async (state) => {
+  const data = await fetchFromAPI(state.query);
+  return { ...state, enrichedData: data };
+});
+
+// Parallel async transforms
+flow.map([
+  async (state) => ({ ...state, result1: await api1(state.data) }),
+  async (state) => ({ ...state, result2: await api2(state.data) }),
+], { parallel: true });
+```
+
+## Returns (Final Output)
+
+```typescript
+const wf = flow<{ input: string }>()
+  .map((state) => ({ ...state, upper: state.input.toUpperCase(), len: state.input.length }))
+  .returns((state) => ({ upper: state.upper, isLong: state.len > 20 }));
+
+// Result is typed as { upper: string; isLong: boolean }
+const result = await wf.forward(llm, { input: 'test' });
+```
+
+## Sequential Processing
+
+```typescript
+const wf = flow<{ input: string }, { finalResult: string }>()
+  .node('step1', 'input:string -> intermediate:string')
+  .node('step2', 'intermediate:string -> output:string')
+  .execute('step1', (state) => ({ input: state.input }))
+  .execute('step2', (state) => ({ intermediate: state.step1Result.intermediate }))
+  .returns((state) => ({ finalResult: state.step2Result.output }));
+```
+
+## Auto-Parallel Execution
+
+Independent executes run in parallel automatically (`autoParallel: true` by default):
+
+```typescript
+const wf = flow<{ text: string }, { combined: string }>()
+  .node('sentimentAnalyzer', 'text:string -> sentiment:string')
+  .node('topicExtractor', 'text:string -> topics:string[]')
+  .node('entityRecognizer', 'text:string -> entities:string[]')
+  // These three run in parallel (all depend only on state.text)
+  .execute('sentimentAnalyzer', (state) => ({ text: state.text }))
+  .execute('topicExtractor', (state) => ({ text: state.text }))
+  .execute('entityRecognizer', (state) => ({ text: state.text }))
+  // This waits for all three
+  .returns((state) => ({
+    combined: JSON.stringify({
+      sentiment: state.sentimentAnalyzerResult.sentiment,
+      topics: state.topicExtractorResult.topics,
+      entities: state.entityRecognizerResult.entities,
+    }),
+  }));
+
+// Inspect execution plan
+const plan = wf.getExecutionPlan();
+console.log(plan.parallelGroups, plan.maxParallelism);
+```
+
+Disable auto-parallel:
+
+```typescript
+const wf = flow({ autoParallel: false });
+// or per execution:
+await wf.forward(llm, input, { autoParallel: false });
+```
+
+## Conditional Branching
+
+```typescript
+const wf = flow<{ query: string; expertMode: boolean }, { response: string }>()
+  .node('simple', 'query:string -> response:string')
+  .node('expert', 'query:string -> response:string')
+  .branch((state) => state.expertMode)
+    .when(true)
+      .execute('expert', (state) => ({ query: state.query }))
+    .when(false)
+      .execute('simple', (state) => ({ query: state.query }))
+  .merge()
+  .returns((state) => ({
+    response: state.expertResult?.response ?? state.simpleResult?.response,
+  }));
+```
+
+After `.merge()`, only the taken branch's result exists; use optional chaining (`?.`) on untaken branch results.
+
+## While Loops
+
+```typescript
+const wf = flow<{ content: string }, { finalContent: string }>()
+  .node('processor', 'content:string -> processedContent:string')
+  .node('qualityChecker', 'content:string -> qualityScore:number')
+  .map((state) => ({ currentContent: state.content, iteration: 0, qualityScore: 0 }))
+  .while((state) => state.iteration < 3 && state.qualityScore < 0.8)
+    .map((state) => ({ ...state, iteration: state.iteration + 1 }))
+    .execute('processor', (state) => ({ content: state.currentContent }))
+    .execute('qualityChecker', (state) => ({
+      content: state.processorResult.processedContent,
+    }))
+    .map((state) => ({
+      ...state,
+      currentContent: state.processorResult.processedContent,
+      qualityScore: state.qualityCheckerResult.qualityScore,
+    }))
+  .endWhile()
+  .returns((state) => ({ finalContent: state.currentContent }));
+```
+
+Rules:
+- Every `.while()` needs a matching `.endWhile()`.
+- Ensure the loop condition can change to avoid infinite loops.
+
+## Feedback Loops (label/feedback)
+
+```typescript
+const wf = flow<{ prompt: string }, { result: string }>()
+  .node('gen', 'prompt:string -> result:string, quality:number')
+  .map((state) => ({ ...state, tries: 0 }))
+  .label('retry')
+    .map((state) => ({ ...state, tries: state.tries + 1 }))
+    .execute('gen', (state) => ({ prompt: state.prompt }))
+  .feedback((state) => state.genResult.quality < 0.9 && state.tries < 3, 'retry')
+  .returns((state) => ({ result: state.genResult.result }));
+```
+
+Rules:
+- Define the label before referencing it in `.feedback()`.
+- Always include a max-iteration guard to avoid infinite loops.
+
+## Explicit Parallel Sub-Flows
+
+```typescript
+flow
+  .parallel([
+    (sub) => sub.execute('analyzer1', (state) => ({ text: state.input })),
+    (sub) => sub.execute('analyzer2', (state) => ({ text: state.input })),
+    (sub) => sub.execute('analyzer3', (state) => ({ text: state.input })),
+  ])
+  .merge('combinedResults', (r1, r2, r3) => ({
+    a1: r1.analyzer1Result.analysis,
+    a2: r2.analyzer2Result.analysis,
+    a3: r3.analyzer3Result.analysis,
+  }));
+```
+
+## Derive (Batch/Array Processing)
+
+```typescript
+const wf = flow<{ items: string[] }, { processed: string[] }>({ batchSize: 3 })
+  .derive('processed', 'items', (item, index) => `processed-${item}-${index}`, {
+    batchSize: 2,
+  });
+```
+
+## Dynamic AI Context (Multi-Model)
+
+Route nodes to different AI providers:
+
+```typescript
+const fast = ai({ name: 'groq', apiKey: '...' });
+const smart = ai({ name: 'anthropic', apiKey: '...' });
+
+const wf = flow<{ text: string }, { out: string }>()
+  .node('draft', 'text:string -> out:string')
+  .node('refine', 'text:string -> out:string')
+  .execute('draft', (state) => ({ text: state.text }), { ai: fast })
+  .execute('refine', (state) => ({ text: state.draftResult.out }), { ai: smart })
+  .returns((state) => ({ out: state.refineResult.out }));
+```
+
+## Description and toFunction
+
+```typescript
+const wf = flow<{ userQuestion: string }, { responseText: string }>()
+  .node('qa', 'userQuestion:string -> responseText:string')
+  .execute('qa', (state) => ({ userQuestion: state.userQuestion }))
+  .returns((state) => ({ responseText: state.qaResult.responseText }))
+  .description('Question Answerer', 'Answers user questions concisely.');
+
+const fn = wf.toFunction();
+// fn.name, fn.parameters (JSON Schema), fn.func
+```
+
+## Instrumentation (Tracing)
+
+```typescript
+import { ai, flow } from '@ax-llm/ax';
+import { context, trace } from '@opentelemetry/api';
+
+const tracer = trace.getTracer('axflow');
+const llm = ai({ name: 'openai', apiKey: '...' });
+
+const wf = flow<{ userQuestion: string }>()
+  .node('summarizer', 'documentText:string -> summaryText:string')
+  .execute('summarizer', (s) => ({ documentText: s.userQuestion }))
+  .returns((s) => ({ answer: s.summarizerResult.summaryText }));
+
+const result = await wf.forward(llm, { userQuestion: 'hi' }, {
+  tracer,
+  traceContext: context.active(),
+});
+```
+
+## Program IDs and Demos
+
+```typescript
+const wf = flow<{ input: string }>()
+  .node('summarizer', 'text:string -> summary:string')
+  .node('classifier', 'text:string -> category:string');
+
+// Discover program IDs
+console.log(wf.namedPrograms());
+// [{ id: 'root.summarizer', ... }, { id: 'root.classifier', ... }]
+
+// Set demos (TypeScript catches typos)
+wf.setDemos([{ programId: 'root.summarizer', traces: [] }]);
+
+// Apply optimization
+wf.applyOptimization(optimizedProgram);
+```
+
+## Error Handling
+
+```typescript
+try {
+  const result = await wf.forward(llm, input);
+} catch (error) {
+  console.error('Flow execution failed:', error);
+}
+```
+
+Common errors:
+- `"Node 'x' not found"` -- define `.node()` before `.execute()`.
+- `"endWhile() without matching while()"` -- every `.while()` needs `.endWhile()`.
+- `"when() without matching branch()"` -- `.when()` must be inside `.branch()`/`.merge()`.
+- `"merge() without matching branch()"` -- every `.branch()` needs `.merge()`.
+- `"Label 'x' not found"` -- define `.label()` before `.feedback()` references it.
+
+## Examples
+
+Fetch these for full working code:
+
+- [Flow](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/ax-flow.ts) — complete flow usage
+- [Auto-Parallel](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/ax-flow-auto-parallel.ts) — auto-parallelization
+- [Async Map](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/ax-flow-async-map.ts) — async map transforms
+- [Enhanced Demo](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/ax-flow-enhanced-demo.ts) — instance-based nodes
+- [Flow as Function](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/ax-flow-to-function.ts) — flow as callable function
+- [Fluent Builder](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/fluent-flow-example.ts) — fluent builder pattern
+- [Flow Logging](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/flow-logging-simple.ts) — flow logging
+- [Load Balancing](https://raw.githubusercontent.com/ax-llm/ax/refs/heads/main/src/examples/balancer.ts) — load balancing
+
+## Do Not Generate
+
+- Do not use `new AxFlow(...)` for new code.
+- Do not execute a node before defining it with `.node()`.
+- Do not use generic field names like `text`, `result`, `data`, `input`, `output`.
+- Do not create deep-nested state objects in `.map()`.
+- Do not create loop conditions that can never change.
+- Do not add unnecessary dependencies between executes (kills auto-parallelism).
+- Do not forget to use optional chaining on branch results after `.merge()`.