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Dynamic Plan

<Branch> chooses between execution paths at runtime. Here, an analyzer classifies task complexity and routes to either a quick fix or a multi-step plan.

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Workflow Definition

// dynamic-plan.tsx
import { createSmithers, Task, Sequence, Branch } from "smithers-orchestrator";
import { ToolLoopAgent as Agent } from "ai";
import { anthropic } from "@ai-sdk/anthropic";
import { z } from "zod";

const { Workflow, smithers, outputs } = createSmithers({
  analysis: z.object({
    summary: z.string(),
    complexity: z.enum(["low", "high"]),
  }),
  plan: z.object({
    steps: z.array(z.string()),
  }),
  result: z.object({
    output: z.string(),
  }),
});

const analyzer = new Agent({
  model: anthropic("claude-sonnet-4-5-20250929"),
  instructions:
    "Analyze the given task. Determine if it is low or high complexity. Return a short summary and a complexity rating.",
});

const planner = new Agent({
  model: anthropic("claude-sonnet-4-5-20250929"),
  instructions: "Break the task into concrete, ordered steps.",
});

const implementer = new Agent({
  model: anthropic("claude-sonnet-4-5-20250929"),
  instructions: "Implement the requested task and return the result.",
});

export default smithers((ctx) => {
  const analysis = ctx.outputMaybe("analysis", { nodeId: "analyze" });
  const isComplex = analysis?.complexity === "high";

  return (
    <Workflow name="dynamic-plan">
      <Sequence>
        <Task id="analyze" output={outputs.analysis} agent={analyzer}>
          Analyze this task and classify its complexity: "Refactor the authentication
          module to support OAuth2 and SAML providers."
        </Task>

        <Branch
          if={isComplex}
          then={
            <Sequence>
              <Task id="plan" output={outputs.plan} agent={planner}>
                Create a step-by-step plan for: {analysis?.summary}
              </Task>
              <Task id="implement" output={outputs.result} agent={implementer}>
                Execute these steps:{" "}
                {ctx
                  .outputMaybe("plan", { nodeId: "plan" })
                  ?.steps.join(", ")}
              </Task>
            </Sequence>
          }
          else={
            <Task id="implement" output={outputs.result} agent={implementer}>
              Quick implementation for: {analysis?.summary}
            </Task>
          }
        />
      </Sequence>
    </Workflow>
  );
});

​
Running

smithers up dynamic-plan.tsx --input '{}'
High complexity path: 
[dynamic-plan] Starting run def456
[analyze] Done -> { summary: "Refactor auth to support OAuth2 + SAML", complexity: "high" }
[plan] Done -> { steps: ["Abstract provider interface", "Implement OAuth2", "Implement SAML", "Add tests"] }
[implement] Done -> { output: "Refactored auth module with provider abstraction..." }
[dynamic-plan] Completed
Low complexity path (planner skipped): 
[analyze] Done -> { summary: "Minor auth tweak", complexity: "low" }
[implement] Done -> { output: "Applied quick fix..." }

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How Branch Works

  • if is evaluated each time the workflow re-renders. Only the matching branch (then or else) is mounted.
  • The Branch is inside a Sequence, so it is not reached until analyze finishes and analysis is populated.
  • Resumable: completed task outputs are persisted, so re-running picks up where it left off.