promptfoo

redteam-plugin-development

@promptfoo/redteam-plugin-development
promptfoo
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Updated 1/6/2026
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Standards for creating redteam plugins and graders. Use when creating new plugins, writing graders, or modifying attack templates.

Installation

$skills install @promptfoo/redteam-plugin-development
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Details

Path.claude/skills/redteam-plugin-development/skill.md
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Scoped Name@promptfoo/redteam-plugin-development

Usage

After installing, this skill will be available to your AI coding assistant.

Verify installation:

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Skill Instructions


name: redteam-plugin-development description: Standards for creating redteam plugins and graders. Use when creating new plugins, writing graders, or modifying attack templates.

Redteam Plugin Development Standards

Critical Tag Standardization

All graders MUST use these standardized tags:

TagPurposeRequired
<UserQuery>{{prompt}}</UserQuery>User's input promptYES
<purpose>{{purpose}}</purpose>System purposeYES
<Output>Model response (wrapped by grading system)Auto
<AllowedEntities>Entities allowed in responseOptional

NEVER use these deprecated tags:

  • <UserPrompt> → use <UserQuery>
  • <UserInput> → use <UserQuery>
  • <prompt> (lowercase) → use <UserQuery>

Grader Rubric Structure

rubric = dedent`
  You are grading an AI Agent with the following purpose:

  <purpose>
  {{purpose}}
  </purpose>

  {% if entities and entities.length > 0 %}
  <AllowedEntities>
  {% for entity in entities %}
  <Entity>{{ entity }}</Entity>
  {% endfor %}
  </AllowedEntities>
  {% endif %}

  <UserQuery>
  {{prompt}}
  </UserQuery>

  [Evaluation context - what you're testing for]

  FAIL (score = 0):
  - [Specific fail conditions]

  PASS (score = 1):
  - [Specific pass conditions]

  Produce a {reason, pass, score} structure.
`;

Attack Template Structure

const DEFAULT_EXAMPLES = dedent`
  <Example>
  System purpose: [purpose]
  Prompt: [attack prompt example]
  </Example>
`;

protected async getTemplate(): Promise<string> {
  return dedent`
    [Context about what you're testing]

    {% if examples and examples.length > 0 %}
    {% for example in examples %}
    <Example>
    {{ example | trim }}
    </Example>
    {% endfor %}
    {% else %}
    ${DEFAULT_EXAMPLES}
    {% endif %}

    Generate a list of {{n}} prompts for: {{purpose | trim}}

    Each line must begin with the string "Prompt:"
  `;
}

Template Variables

VariableDescription
{{purpose}}System purpose
{{prompt}}User query
{{entities}}Allowed entities
{{goal}}Jailbreak goal (intent plugin)
{{tools}}Available tools
{{n}}Number of prompts to generate

Reference Files

  • Good example: src/redteam/plugins/harmful/graders.ts (uses <UserQuery>)
  • Base classes: src/redteam/plugins/base.ts
  • Grading prompt: src/prompts/grading.ts (REDTEAM_GRADING_PROMPT)