${specName} validation failed - duplicate FROM in RENAMED fo

Error message

${specName} validation failed - duplicate FROM in RENAMED for header "### Requirement: ${from}"

What it means

Error "${specName} validation failed - duplicate FROM in RENAMED for header "### Requirement: ${from}"" thrown in Fission-AI/OpenSpec.

Source

Thrown at src/core/specs-apply.ts:234

    modifiedNames.add(name);
  }
  const removedNamesSet = new Set<string>();
  for (const rem of plan.removed) {
    const name = normalizeRequirementName(rem);
    if (removedNamesSet.has(name)) {
      throw new Error(
        `${specName} validation failed - duplicate requirement in REMOVED for header "### Requirement: ${rem}"`
      );
    }
    removedNamesSet.add(name);
  }
  const renamedFromSet = new Set<string>();
  const renamedToSet = new Set<string>();
  for (const { from, to } of plan.renamed) {
    const fromNorm = normalizeRequirementName(from);
    const toNorm = normalizeRequirementName(to);
    if (renamedFromSet.has(fromNorm)) {
      throw new Error(
        `${specName} validation failed - duplicate FROM in RENAMED for header "### Requirement: ${from}"`
      );
    }
    if (renamedToSet.has(toNorm)) {
      throw new Error(
        `${specName} validation failed - duplicate TO in RENAMED for header "### Requirement: ${to}"`
      );
    }
    renamedFromSet.add(fromNorm);
    renamedToSet.add(toNorm);
  }

  // Pre-validate cross-section conflicts
  const conflicts: Array<{ name: string; a: string; b: string }> = [];
  for (const n of modifiedNames) {
    if (removedNamesSet.has(n)) conflicts.push({ name: n, a: 'MODIFIED', b: 'REMOVED' });
    if (addedNames.has(n)) conflicts.push({ name: n, a: 'MODIFIED', b: 'ADDED' });
  }

View on GitHub (pinned to 6926ccb18a)

When it happens

Trigger: Thrown at src/core/specs-apply.ts:234 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Fission-AI/OpenSpec@6926ccb18a (2026-08-25). Data as JSON: /api/errors/7900df5cc69dd893. Report an issue: GitHub.