bytedance/deer-flow · error · HTTPException

Custom skill '{skill_name}' has no history

Error message

Custom skill '{skill_name}' has no history

What it means

Error "Custom skill '{skill_name}' has no history" thrown in bytedance/deer-flow.

Source

Thrown at backend/app/gateway/routers/skills.py:369

            raise HTTPException(status_code=404, detail=f"Custom skill '{skill_name}' not found")
        return CustomSkillHistoryResponse(history=history)
    except HTTPException:
        raise
    except Exception as e:
        logger.error("Failed to read history for %s: %s", skill_name, e, exc_info=True)
        raise HTTPException(status_code=500, detail=f"Failed to read history: {str(e)}")


@router.post("/skills/custom/{skill_name}/rollback", response_model=CustomSkillContentResponse, summary="Rollback Custom Skill")
async def rollback_custom_skill(skill_name: str, body: SkillRollbackRequest, request: Request, config: AppConfig = Depends(get_config)) -> CustomSkillContentResponse:
    await require_admin_user(request, detail=_ADMIN_REQUIRED_DETAIL)
    try:
        storage = _get_user_skill_storage(config)
        if not storage.custom_skill_exists(skill_name) and not storage.get_skill_history_file(skill_name).exists():
            raise HTTPException(status_code=404, detail=f"Custom skill '{skill_name}' not found")
        history = storage.read_history(skill_name)
        if not history:
            raise HTTPException(status_code=400, detail=f"Custom skill '{skill_name}' has no history")
        record = history[body.history_index]
        target_content = record.get("prev_content")
        if target_content is None:
            raise HTTPException(status_code=400, detail="Selected history entry has no previous content to roll back to")
        storage.validate_skill_markdown_content(skill_name, target_content)
        static_findings = await _scan_static_skill_markdown_or_raise(skill_name, target_content, app_config=config)
        scan = await scan_skill_content(target_content, executable=False, location=f"{skill_name}/{SKILL_MD_FILE}", app_config=config, static_findings=static_findings)
        skill_file = storage.get_custom_skill_file(skill_name)
        current_content = skill_file.read_text(encoding="utf-8") if skill_file.exists() else None
        history_entry = {
            "action": "rollback",
            "author": "human",
            "thread_id": None,
            "file_path": SKILL_MD_FILE,
            "prev_content": current_content,
            "new_content": target_content,
            "rollback_from_ts": record.get("ts"),
            "scanner": {"decision": scan.decision, "reason": scan.reason, "static_findings": static_findings},

View on GitHub (pinned to 1dd6ba1acb)

Solutions

1. Edit and save the custom skill at least once to create a history entry before requesting history.
2. Confirm the skill_name matches an existing custom skill.

When it happens

Trigger: Thrown at backend/app/gateway/routers/skills.py:369 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bytedance/deer-flow@1dd6ba1acb (2026-08-14). Data as JSON: /api/errors/7ffeb59a86b4a10e. Report an issue: GitHub.