Tencent/WeKnora · error

follow-up additional_instruction exceeds 2000 characters

Error message

follow-up additional_instruction exceeds 2000 characters

What it means

Validation error from QuestionSuggestionConfig.Validate: follow-ups.AdditionalInstruction exceeds 2000 characters, so the agent-authored instruction is rejected before it is stored or sent to a model.

Source

Thrown at internal/types/custom_agent.go:404

		return fmt.Errorf("follow-up max_context_turns must be between 1 and 5")
	}
	if !oneOf(c.Starters.Mode, SuggestionModeCurated, SuggestionModeKnowledge, SuggestionModeHybrid) {
		return fmt.Errorf("invalid starter suggestion mode %q", c.Starters.Mode)
	}
	if !oneOf(c.FollowUps.Mode, SuggestionModeGenerated, SuggestionModeKnowledge, SuggestionModeHybrid) {
		return fmt.Errorf("invalid follow-up suggestion mode %q", c.FollowUps.Mode)
	}
	for i, item := range c.Starters.Items {
		trimmed := strings.TrimSpace(item)
		if trimmed == "" {
			return fmt.Errorf("starter suggestion %d cannot be empty", i+1)
		}
		if len([]rune(trimmed)) > 200 {
			return fmt.Errorf("starter suggestion %d exceeds 200 characters", i+1)
		}
	}
	if len([]rune(strings.TrimSpace(c.FollowUps.AdditionalInstruction))) > 2000 {
		return fmt.Errorf("follow-up additional_instruction exceeds 2000 characters")
	}
	for _, category := range c.FollowUps.Categories {
		if !oneOf(category, SuggestionCategoryClarify, SuggestionCategoryDeepen, SuggestionCategoryAction) {
			return fmt.Errorf("invalid follow-up suggestion category %q", category)
		}
	}
	return nil
}

func oneOf(value string, allowed ...string) bool {
	for _, candidate := range allowed {
		if value == candidate {
			return true
		}
	}
	return false
}

View on GitHub (pinned to 988cbb0330)

Solutions

1. Shorten additional_instruction to 2000 characters or fewer
2. Split long instructions into concise, focused guidance

When it happens

Trigger: Thrown at internal/types/custom_agent.go:404 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Tencent/WeKnora@988cbb0330 (2026-09-02). Data as JSON: /api/errors/898a8b48703814c2. Report an issue: GitHub.