ruvnet/ruflo · error

duplicate anchor task id

Error message

duplicate anchor task id: ${task.id}

What it means

Anchor task ids must be unique within the file — validation builds a Set as it walks the tasks and the second occurrence of an id throws, naming the duplicate. Duplicate ids would corrupt receipt correlation and the order-independent corpus hash (`humanEvalHash` sorts by id).

Solutions

1. Find the duplicate named in the message and give one of the two tasks a distinct id
2. Dedupe programmatically when generating anchors from other sources
3. Re-run after fixing — validation reports one duplicate at a time, so large files may need several passes

Example fix

// before
[ { "id": "login", "q": "..." }, { "id": "login", "q": "other..." } ]

// after
[ { "id": "login", "q": "..." }, { "id": "login-oauth", "q": "other..." } ]

import { readFileSync } from 'node:fs';

function anchorTaskIdsUnique(file: string): { ok: boolean; duplicate?: string } {
  const { tasks } = JSON.parse(readFileSync(file, 'utf8'));
  const seen = new Set<string>();
  for (const t of tasks ?? []) {
    if (seen.has(t.id)) return { ok: false, duplicate: t.id };
    seen.add(t.id);
  }
  return { ok: true };
}

try {
  return loadEffectiveFlywheelAnchor(root, opts);
} catch (e) {
  if (e instanceof Error && e.message.startsWith('duplicate anchor task id')) {
    const dup = e.message.split(': ')[1];
    throw new Error(`Two tasks share id '${dup}' — rename one; ids are lineage correlation keys and must be unique.`);
  }
  throw e;
}

When it happens

Trigger: Two tasks sharing an id, typically after merging two anchor files or copy-pasting a task and editing its query but forgetting to change its id.

Common situations: Manual curation merges; generators appending tasks without dedupe; refactors that rewrite queries but leave ids untouched.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• anchor task has no query
• anchor task requires non-empty string labels
• flywheel anchor manifest requires path and sha256
• invalid anchor task id at index
• project flywheel anchor requires at least 4 labelled tasks

AI-assisted analysis of ruvnet/ruflo@2602b642d9 (2026-08-18). Data as JSON: /api/errors/96a65d128473c3e0. Report an issue: GitHub.

Appendix: source

Thrown at v3/@claude-flow/cli/src/services/harness-project-anchor.ts:102

function parseTasks(path: string): { version: string; tasks: HumanEvalTask[] } {
  const parsed = JSON.parse(readFileSync(path, 'utf8')) as {
    schemaVersion?: string;
    version?: string;
    tasks?: HumanEvalTask[];
  };
  if (parsed.schemaVersion && parsed.schemaVersion !== PROJECT_ANCHOR_SCHEMA) {
    throw new Error(`unsupported flywheel anchor schema: ${parsed.schemaVersion}`);
  }
  if (!Array.isArray(parsed.tasks) || parsed.tasks.length < 4) {
    throw new Error('project flywheel anchor requires at least 4 labelled tasks');
  }
  const ids = new Set<string>();
  for (const [index, task] of parsed.tasks.entries()) {
    if (!task || typeof task.id !== 'string' || !/^[A-Za-z0-9._-]{1,128}$/.test(task.id)) {
      throw new Error(`invalid anchor task id at index ${index}`);
    }
    if (ids.has(task.id)) throw new Error(`duplicate anchor task id: ${task.id}`);
    ids.add(task.id);
    if (typeof task.q !== 'string' || task.q.trim().length === 0) {
      throw new Error(`anchor task ${task.id} has no query`);
    }
    if (!Array.isArray(task.labels) || task.labels.length === 0 || task.labels.some((label) => typeof label !== 'string' || !label.trim())) {
      throw new Error(`anchor task ${task.id} requires non-empty string labels`);
    }
  }
  return { version: parsed.version ?? 'project-anchor-v1', tasks: parsed.tasks };
}

function toSelection(
  path: string,
  expectedHash: string,
): FlywheelAnchorSelection {
  const parsed = parseTasks(path);
  const actualHash = humanEvalHash(parsed.tasks);
  if (actualHash !== normalizeHash(expectedHash)) {

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