> ## Documentation Index
> Fetch the complete documentation index at: https://smithers-feat-claude-workflow-mirror.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# <DriftDetector>

> Capture state, compare against a baseline, and alert on meaningful drift.

```ts theme={null}
// Props
import { DriftDetector } from "smithers-orchestrator";

type DriftDetectorProps = {
  id?: string; // default "drift"; ids {id}-capture, {id}-compare
  captureAgent: AgentLike;
  compareAgent: AgentLike;
  captureOutput: OutputTarget;
  compareOutput: OutputTarget; // include `drifted: boolean`
  baseline: unknown;
  alertIf?: (comparison: any) => boolean; // default: comparison.drifted === true
  alert?: ReactElement;
  poll?: { intervalMs?: number; maxPolls?: number }; // default maxPolls = 100; intervalMs is reserved, not yet passed to the Loop
  skipIf?: boolean;
};
```

```tsx theme={null}
<Workflow name="api-drift-check">
  <DriftDetector
    captureAgent={snapshotAgent}
    compareAgent={diffAgent}
    captureOutput={outputs.capture}
    compareOutput={outputs.compare}
    baseline={{ endpoints: ["/users", "/orders"], schemaHash: "abc123" }}
    alert={
      <Task id="notify" output={outputs.notify} agent={slackAgent}>
        API drift detected. Notify the team.
      </Task>
    }
  />
</Workflow>
```

## Notes

* Without `poll`, the component runs once; with `poll`, it wraps in a Loop.
* When comparison output exists, `alertIf` decides whether to render `alert`; without `alertIf`, `comparison.drifted === true` is the trigger.
* Without `alert`, the component compares but takes no action on drift.

## Source

The `<DriftDetector>` implementation and the files it imports, straight from the package source. This section is generated; edit the source, not this block.

<CodeGroup>
  ```js DriftDetector.js theme={null}
  import React from "react";
  import { SmithersContext } from "@smithers-orchestrator/react-reconciler/context";
  import { Task } from "./Task.js";
  import { Sequence } from "./Sequence.js";
  import { Branch } from "./Branch.js";
  import { Loop } from "./Ralph.js";
  /** @typedef {import("./DriftDetectorProps.ts").DriftDetectorProps} DriftDetectorProps */

  /**
   * @param {unknown} value
   * @returns {value is Record<string, unknown>}
   */
  function isRecord(value) {
      return Boolean(value) && typeof value === "object" && !Array.isArray(value);
  }

  /**
   * @param {unknown} comparison
   * @param {((comparison: unknown) => boolean) | undefined} alertIf
   * @returns {boolean}
   */
  function shouldAlert(comparison, alertIf) {
      if (comparison == null) {
          return false;
      }
      if (alertIf) {
          return Boolean(alertIf(comparison));
      }
      return isRecord(comparison) && comparison.drifted === true;
  }

  /**
   * @param {DriftDetectorProps} props
   */
  export function DriftDetector(props) {
      if (props.skipIf)
          return null;
      const prefix = props.id ?? "drift";
      const ctx = React.useContext(SmithersContext);
      const comparison = ctx?.outputMaybe(props.compareOutput, { nodeId: `${prefix}-compare` });
      const drifted = shouldAlert(comparison, props.alertIf);
      const captureTask = React.createElement(Task, {
          id: `${prefix}-capture`,
          output: props.captureOutput,
          agent: props.captureAgent,
          children: `Capture the current state for drift detection. Baseline reference: ${typeof props.baseline === "string"
              ? props.baseline
              : JSON.stringify(props.baseline)}`,
      });
      const compareTask = React.createElement(Task, {
          id: `${prefix}-compare`,
          output: props.compareOutput,
          agent: props.compareAgent,
          dependsOn: [`${prefix}-capture`],
          children: `Compare the captured current state against the baseline and determine if meaningful drift has occurred. Include a "drifted" boolean and "significance" string in your response. Baseline: ${typeof props.baseline === "string"
              ? props.baseline
              : JSON.stringify(props.baseline)}`,
      });
      const alertBranch = props.alert
          ? React.createElement(Branch, {
              if: drifted,
              then: props.alert,
          })
          : null;
      const sequenceChildren = [captureTask, compareTask];
      if (alertBranch)
          sequenceChildren.push(alertBranch);
      const sequence = React.createElement(Sequence, null, ...sequenceChildren);
      if (props.poll) {
          return React.createElement(Loop, {
              id: `${prefix}-poll`,
              until: false,
              maxIterations: props.poll.maxPolls ?? 100,
              onMaxReached: "return-last",
          }, sequence);
      }
      return sequence;
  }
  ```

  ```js context.js theme={null}
  // @smithers-type-exports-begin
  /** @typedef {import("./OutputSnapshot.ts").OutputSnapshot} OutputSnapshot */
  /** @typedef {import("./SmithersCtxOptions.ts").SmithersCtxOptions} SmithersCtxOptions */
  // @smithers-type-exports-end

  import React from "react";
  import { SmithersCtx } from "@smithers-orchestrator/driver/SmithersCtx";
  import { SmithersError } from "@smithers-orchestrator/errors/SmithersError";
  export { SmithersCtx } from "@smithers-orchestrator/driver/SmithersCtx";
  /** @type {React.Context<SmithersCtx<any> | null>} */
  export const SmithersContext = React.createContext(null);
  SmithersContext.displayName = "SmithersContext";
  /**
   * @template Schema
   * @returns {{ SmithersContext: React.Context<SmithersCtx<Schema> | null>, useCtx: () => SmithersCtx<Schema> }}
   */
  export function createSmithersContext() {
      /** @type {React.Context<SmithersCtx<Schema> | null>} */
      const Context = React.createContext(null);
      Context.displayName = "SmithersContext";
      /**
     * @returns {SmithersCtx<Schema>}
     */
      function useCtx() {
          const ctx = React.useContext(Context);
          if (!ctx) {
              throw new SmithersError("CONTEXT_OUTSIDE_WORKFLOW", "useCtx() must be called inside a <Workflow> created by createSmithers()");
          }
          return ctx;
      }
      return { SmithersContext: Context, useCtx };
  }
  ```

  ```js Task.js theme={null}
  // @smithers-type-exports-begin
  /**
   * @template D
   * @typedef {import("./InferDeps.ts").InferDeps<D>} InferDeps
   */
  /** @typedef {import("./OutputTarget.ts").OutputTarget} OutputTarget */
  // @smithers-type-exports-end

  import React from "react";
  import { renderToStaticMarkup } from "react-dom/server";
  import { markdownComponents } from "../markdownComponents.js";
  import { zodSchemaToJsonExample } from "../zod-to-example.js";
  import { SmithersError } from "@smithers-orchestrator/errors/SmithersError";
  import { SmithersContext } from "@smithers-orchestrator/react-reconciler/context";
  import { AspectContext } from "../aspects/AspectContext.js";
  import { AntigravityAgent } from "@smithers-orchestrator/agents/AntigravityAgent";
  import { ClaudeCodeAgent } from "@smithers-orchestrator/agents/ClaudeCodeAgent";
  import { GeminiAgent } from "@smithers-orchestrator/agents/GeminiAgent";
  import { PiAgent } from "@smithers-orchestrator/agents/PiAgent";
  /** @typedef {import("@smithers-orchestrator/agents/AgentLike").AgentLike} AgentLike */
  /** @typedef {import("./DepsSpec.ts").DepsSpec} DepsSpec */
  /**
   * @template Row, Output, D
   * @typedef {import("./TaskProps.ts").TaskProps<Row, Output, D>} TaskProps
   */

  /**
   * Render a prompt React node to plain markdown text.
   *
   * If the prompt is a React element (e.g. a compiled MDX component), we inject
   * `markdownComponents` via the standard MDX `components` prop so that
   * renderToStaticMarkup outputs clean markdown instead of HTML.
   * No HTML tag stripping or entity decoding needed.
   * @param {unknown} prompt
   * @returns {string}
   */
  export function renderPromptToText(prompt) {
      if (prompt == null)
          return "";
      if (typeof prompt === "string")
          return prompt;
      if (typeof prompt === "number")
          return String(prompt);
      try {
          let element;
          if (React.isValidElement(prompt)) {
              // Inject markdown components into the element so MDX components
              // render fragments instead of HTML tags.
              element = React.cloneElement(prompt, {
                  components: markdownComponents,
              });
          }
          else {
              element = React.createElement(React.Fragment, null, prompt);
          }
          return renderToStaticMarkup(element)
              .replace(/\n{3,}/g, "\n\n")
              .trim();
      }
      catch (err) {
          const result = String(prompt ?? "");
          if (result === "[object Object]") {
              throw new SmithersError("MDX_PRELOAD_INACTIVE", `MDX prompt could not be rendered — the prompt resolved to [object Object] instead of a React component.\n\n` +
                  `This usually means the MDX preload is not active. Common causes:\n` +
                  `  • bunfig.toml uses [run] preload instead of top-level preload (the [run] section doesn't apply to dynamic imports)\n` +
                  `  • bunfig.toml is not in the current working directory\n` +
                  `  • mdxPlugin() is not registered in the preload script\n` +
                  `  • The MDX file is imported without a default import (use: import MyPrompt from "./prompt.mdx")\n\n` +
                  `Original error: ${err instanceof Error ? err.message : String(err)}`);
          }
          return result;
      }
  }
  /**
   * @param {unknown} value
   * @returns {value is import("zod").ZodObject<import("zod").ZodRawShape>}
   */
  function isZodObject(value) {
      return Boolean(value && typeof value === "object" && "shape" in value);
  }
  /**
   * @param {DepsSpec | undefined} deps
   * @param {Record<string, string> | undefined} needs
   * @returns {string[] | undefined}
   */
  function deriveDepNodeIds(deps, needs) {
      if (!deps)
          return undefined;
      const ids = new Set();
      for (const key of Object.keys(deps)) {
          const nodeId = needs?.[key] ?? key;
          if (nodeId)
              ids.add(nodeId);
      }
      return ids.size > 0 ? [...ids] : undefined;
  }
  /**
   * @param {string[] | undefined} dependsOn
   * @param {string[] | undefined} depNodeIds
   * @returns {string[] | undefined}
   */
  function mergeDependsOn(dependsOn, depNodeIds) {
      const merged = new Set();
      for (const id of dependsOn ?? [])
          merged.add(id);
      for (const id of depNodeIds ?? [])
          merged.add(id);
      return merged.size > 0 ? [...merged] : undefined;
  }
  /**
   * @param {any} ctx
   * @param {DepsSpec | undefined} deps
   * @param {Record<string, string> | undefined} needs
   * @returns {Record<string, unknown> | null}
   */
  function resolveDeps(ctx, deps, needs) {
      if (!deps)
          return Object.create(null);
      const keys = Object.keys(deps);
      if (keys.length === 0)
          return Object.create(null);
      const resolved = Object.create(null);
      for (const key of keys) {
          const target = deps[key];
          const nodeId = needs?.[key] ?? key;
          const value = ctx.outputMaybe(target, { nodeId });
          if (value === undefined)
              return null;
          resolved[key] = value;
      }
      return resolved;
  }
  /**
   * @param {AgentLike} agent
   * @param {string[] | undefined} allowTools
   * @returns {AgentLike}
   */
  function applyCliToolAllowlist(agent, allowTools) {
      if (!allowTools) {
          return agent;
      }
      if (agent instanceof ClaudeCodeAgent) {
          const opts = { ...agent.opts };
          if (allowTools.length === 0) {
              return new ClaudeCodeAgent({
                  ...opts,
                  allowedTools: [],
                  tools: "",
              });
          }
          return new ClaudeCodeAgent({
              ...opts,
              allowedTools: [...allowTools],
          });
      }
      if (agent instanceof PiAgent) {
          const opts = { ...agent.opts };
          if (allowTools.length === 0) {
              return new PiAgent({
                  ...opts,
                  tools: [],
                  noTools: true,
              });
          }
          return new PiAgent({
              ...opts,
              tools: [...allowTools],
              noTools: false,
          });
      }
      if (agent instanceof GeminiAgent) {
          const opts = { ...agent.opts };
          return new GeminiAgent({
              ...opts,
              allowedTools: [...allowTools],
          });
      }
      if (agent instanceof AntigravityAgent) {
          const opts = { ...agent.opts };
          return new AntigravityAgent({
              ...opts,
              allowedTools: [...allowTools],
          });
      }
      return agent;
  }
  /**
   * @param {unknown} ctx
   * @param {string[] | undefined} allowTools
   * @returns {string[] | undefined}
   */
  function resolveCliToolAllowlist(ctx, allowTools) {
      if (allowTools !== undefined) {
          return allowTools;
      }
      const cliAgentToolsDefault = ctx && typeof ctx === "object"
          ? ctx.__smithersRuntime?.cliAgentToolsDefault
          : undefined;
      return cliAgentToolsDefault === "explicit-only" ? [] : undefined;
  }
  /**
   * @template Row, Output, D
   * @param {TaskProps<Row, Output, D>} props
   * @returns {React.ReactElement | null}
   */
  export function Task(props) {
      const { children, agent, fallbackAgent, deps, ...rest } = props;
      const taskContext = props.smithersContext ?? SmithersContext;
      const ctx = React.useContext(taskContext);
      const aspectCtx = React.useContext(AspectContext);
      const depNodeIds = deriveDepNodeIds(deps, rest.needs);
      if (deps && !ctx) {
          throw new SmithersError("CONTEXT_OUTSIDE_WORKFLOW", "Task deps require a workflow context. Build the workflow with createSmithers().");
      }
      const resolvedDeps = deps ? resolveDeps(ctx, deps, rest.needs) : undefined;
      if (deps && resolvedDeps == null) {
          // Deps not yet available — component defers until upstream tasks complete.
          // This is normal reactive behavior; the task will re-render once deps are
          // ready. Record the deferral so the engine can distinguish a transient wait
          // from a permanent one: a deferral that survives to quiescence means a
          // dependency that can never resolve (e.g. a deps key that maps to a node id
          // no task produces), which would otherwise be a silent skip.
          ctx?.recordDeferredDep?.(props.id, depNodeIds ?? []);
          return null;
      }
      // Build aspect metadata to attach to the task element so the engine can
      // enforce budgets and track metrics at execution time.
      const aspectMeta = aspectCtx ? buildAspectMeta(aspectCtx) : undefined;
      const agentChain = Array.isArray(agent)
          ? fallbackAgent
              ? [...agent, fallbackAgent]
              : agent
          : agent && fallbackAgent
              ? [agent, fallbackAgent]
              : agent;
      const effectiveAllowTools = resolveCliToolAllowlist(ctx, rest.allowTools);
      const restrictedAgentChain = Array.isArray(agentChain)
          ? agentChain.map((entry) => applyCliToolAllowlist(entry, effectiveAllowTools))
          : agentChain
              ? applyCliToolAllowlist(agentChain, effectiveAllowTools)
              : agentChain;
      const nextDependsOn = mergeDependsOn(rest.dependsOn, depNodeIds);
      const childValue = typeof children === "function" && (agent || deps)
          ? children(resolvedDeps ?? Object.create(null))
          : children;
      if (agent) {
          // Auto-inject `schema` prop into React element children when output is a ZodObject
          let childElement = childValue;
          const schemaForInjection = props.outputSchema ??
              (isZodObject(props.output) ? props.output : undefined);
          if (React.isValidElement(childValue) && schemaForInjection) {
              childElement = React.cloneElement(childValue, {
                  schema: zodSchemaToJsonExample(schemaForInjection),
              });
          }
          const prompt = renderPromptToText(childElement);
          return React.createElement("smithers:task", {
              ...rest,
              dependsOn: nextDependsOn,
              waitAsync: rest.async === true,
              agent: restrictedAgentChain,
              __smithersKind: "agent",
              ...aspectMeta,
          }, prompt);
      }
      if (typeof children === "function" && !deps) {
          const nextProps = {
              ...rest,
              dependsOn: nextDependsOn,
              waitAsync: rest.async === true,
              __smithersKind: "compute",
              __smithersComputeFn: children,
              ...aspectMeta,
          };
          return React.createElement("smithers:task", nextProps, null);
      }
      const nextProps = {
          ...rest,
          dependsOn: nextDependsOn,
          waitAsync: rest.async === true,
          __smithersKind: "static",
          __smithersPayload: childValue,
          __payload: childValue,
          ...aspectMeta,
      };
      return React.createElement("smithers:task", nextProps, null);
  }
  /**
   * Build the __aspects metadata object from the current AspectContext.
   * This is attached to the smithers:task element props so the engine can read
   * budgets and tracking config at execution time.
   * @param {{
   *     tokenBudget?: unknown;
   *     latencySlo?: unknown;
   *     tracking?: unknown;
   *     accumulator?: unknown;
   * }} aspectCtx
   * @returns {{ __aspects: Record<string, unknown> }}
   */
  function buildAspectMeta(aspectCtx) {
      return {
          __aspects: {
              tokenBudget: aspectCtx.tokenBudget,
              latencySlo: aspectCtx.latencySlo,
              tracking: aspectCtx.tracking,
              accumulator: aspectCtx.accumulator,
          },
      };
  }
  ```

  ```js Sequence.js theme={null}
  import React from "react";
  /** @typedef {import("./SequenceProps.ts").SequenceProps} SequenceProps */

  /**
   * @param {SequenceProps} props
   */
  export function Sequence(props) {
      if (props.skipIf)
          return null;
      // Sequence carries no host props of its own; pass an empty bag (align with
      // the sanitizing structural components) so control props don't leak through.
      return React.createElement("smithers:sequence", {}, props.children);
  }
  ```

  ```js Branch.js theme={null}
  import React from "react";
  import { SmithersError } from "@smithers-orchestrator/errors/SmithersError";
  /** @typedef {import("./BranchProps.ts").BranchProps} BranchProps */

  /**
   * @param {BranchProps} props
   */
  export function Branch(props) {
      // <Branch> resolves its subtree from the `then`/`else` props; any JSX children
      // would be silently dropped, removing those tasks from the graph with no
      // feedback. Fail fast instead. (Checked before skipIf so a stray-children
      // mistake still surfaces even on a skipped branch.)
      if (props.children !== undefined && props.children !== null) {
          throw new SmithersError("INVALID_INPUT", `<Branch> does not take children. Use the "then" and "else" props instead, e.g. ` +
              `<Branch if={cond} then={<Task .../>} else={<Task .../>} />. ` +
              `Children passed to <Branch> are silently ignored and would drop those tasks from the graph.`);
      }
      if (props.skipIf)
          return null;
      const chosen = props.if ? props.then : (props.else ?? null);
      // The branch is resolved to `chosen` at render time, so the host element
      // carries no props of its own (align with the sanitizing structural components).
      return React.createElement("smithers:branch", {}, chosen);
  }
  ```

  ```js Ralph.js theme={null}
  // @smithers-type-exports-begin
  /** @typedef {import("./RalphProps.ts").RalphProps} RalphProps */
  // @smithers-type-exports-end

  import React from "react";
  /** @typedef {import("./LoopProps.ts").LoopProps} LoopProps */

  /**
   * @param {LoopProps} props
   */
  export function Loop(props) {
      if (props.skipIf)
          return null;
      // Sanitize to the loop's host props (align with other structural components);
      // key/skipIf are React/control props and children are passed separately.
      const next = {
          id: props.id,
          until: props.until,
          maxIterations: props.maxIterations,
          onMaxReached: props.onMaxReached,
          continueAsNewEvery: props.continueAsNewEvery,
      };
      return React.createElement("smithers:ralph", next, props.children);
  }
  /** @deprecated Use `Loop` instead. */
  export const Ralph = Loop;
  ```

  ```ts DriftDetectorProps.ts theme={null}
  import type React from "react";
  import type { AgentLike } from "@smithers-orchestrator/agents/AgentLike";
  import type { OutputTarget } from "./OutputTarget.ts";

  export type DriftDetectorProps = {
  	/** ID prefix for generated task/component ids. */
  	id?: string;
  	/** Agent that captures the current state snapshot. */
  	captureAgent: AgentLike;
  	/** Agent that compares current state against the baseline. */
  	compareAgent: AgentLike;
  	/** Output schema for the captured state. */
  	captureOutput: OutputTarget;
  	/** Output schema for the comparison result. Should include `drifted: boolean` and `significance: string`. */
  	compareOutput: OutputTarget;
  	/** Static baseline data, or a function/agent that fetches it. */
  	baseline: unknown;
  	/** Condition function that determines whether to fire the alert. If omitted, uses `comparison.drifted === true`. */
  	alertIf?: (comparison: unknown) => boolean;
  	/** Element to render when drift is detected (e.g. a Task that sends a notification). */
  	alert?: React.ReactElement;
  	/** If set, wraps the detector in a Loop for periodic polling. */
  	poll?: {
  		/** Reserved for future delayed polling; maxPolls currently controls Loop iterations. */
  		intervalMs?: number;
  		maxPolls?: number;
  	};
  	/** Skip the entire component. */
  	skipIf?: boolean;
  };
  ```
</CodeGroup>