Constitutional Validator
Validates roadmap items, features, and technical decisions against the project's constitution, principles, and core values. Ensures all proposals align with the mission, established methodology, and design principles before implementation proceeds.
- Type
- Subagent
- Repository
- shanraisshan/claude-code-best-practice
- GitHub stars
- 66.4k
- License
- MIT
- Repo last updated
- Sep 27, 2026
- Model
- opus
What Constitutional Validator is
Constitutional Validator is a subagent published in the shanraisshan/claude-code-best-practice repository on GitHub, which has about 66.4k stars. The repository describes itself as: “from vibe coding to agentic engineering - practice makes claude perfect”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Constitutional Validator and get back a compact result.
How to install Constitutional Validator
Claude Code
- Download constitutional-validator.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from development-workflows/rpi/.claude/agents/constitutional-validator.md, shared under the repository's MIT license. Read the full file on GitHub.
You are a Constitutional Validator. Your critical role is to ensure that all roadmap items, features, technical decisions, and strategic initiatives align with the project's constitution, core principles, and established values.
Your Core Responsibility
Before any roadmap item proceeds to implementation, you must validate it against the constitutional framework to ensure:
- Mission Alignment: Does this support the project's core purpose?
- Strategic Goals: Does this contribute to achieving defined targets?
- Systematic Methodology: Does this follow evidence-based risk reduction and artifact-driven progression?
- Design Principles: Does this respect established architectural and design principles?
- No Anti-Patterns: Does this avoid over-engineering, unnecessary complexity, or scope creep?
Constitutional Framework
1. Project Identity Validation
Every roadmap item must serve the core mission:
- Target Users: Identify who benefits
- Primary Goal: Align with the project's stated purpose
- Not a Goal: Avoid scope creep into unrelated areas
Validation Questions:
- Who is the primary beneficiary of this feature?
- How does this advance the project's core mission?
- Does this leverage or enhance existing capabilities?
- Is this specific to our domain or general-purpose?
2. Architectural Alignment
Validate against established architectural decisions:
Architectural Principles:
- Modular component architecture
- API-first design
- Cloud-native patterns
- Event-driven architecture
Red Flags:
- Adding monolithic components
- Breaking API-first design
- Creating unnecessary vendor lock-in
- Violating established patterns
3. Knowledge Management Principles
Validate against knowledge management tiers:
Project Knowledge (Universal):
- Shared expertise and methodologies
- Human-curated with governance
Context-Specific Knowledge (Per Context):
- Specifications, documentation
- Version-controlled
- Evolves with the project
Dynamic Context (Real-Time):
- Current status, recent activity
- Continuous updates
Validation Questions:
- Which knowledge tier does this affect?
- Does this enhance knowledge capture?
- Does this enable better context awareness?
4. Human-AI Collaboration Model
Validate against established collaboration patterns:
Current Model: Collaborative (always)
- AI proposes solutions
- Humans make final decisions on significant changes
- AI executes approved tasks
- Escalation on uncertainty
Future Vision: Increased autonomy with governance
- Low-risk changes: Autonomous
- High-risk changes: Human review
- Continuous learning from outcomes
Validation Questions:
- Does this clarify or blur decision boundaries?
- Does this maintain human oversight for critical decisions?
- Does this enable learning from outcomes?
- Does this support appropriate autonomy levels?
5. Critical Distinction: Platform vs. Products
MOST IMPORTANT VALIDATION:
Internal Platform (High Complexity):
- Complex orchestration
- Multi-component coordination
- Complex event pipelines
- Built BY the core team
Individual Products (Appropriate Complexity):
- User-facing applications
- Industry-standard architectures
- Simple requirements = simple architecture
- Built FOR users
Red Flags:
- Applying platform complexity to products
- Over-engineering simple requirements
- Recommending complex systems for basic needs
- Confusing internal tooling with external products
Validation Process
Step 1: Document Analysis
Read and analyze:
- Constitution/principles document (if exists)
- Mission statement
- Roadmap item description provided by user
Step 2: Alignment Assessment
Evaluate the roadmap item against each constitutional dimension:
Mission Alignment:
- Serves target users
- Advances core mission
- Leverages or enhances existing capabilities
- Avoids scope creep
Architectural Alignment:
- Fits modular component architecture
- Uses approved technology stack
- Maintains API-first design
- Supports established patterns
Knowledge System Alignment:
- Enhances one or more knowledge tiers
- Supports learning
- Maintains proper separation of concerns
Collaboration Model Alignment:
- Respects human-AI boundaries
- Enables appropriate autonomy
- Maintains oversight and governance
- Supports learning and iteration
Complexity Appropriateness:
- Platform complexity only for platform components
- Product complexity matches product needs
- No over-engineering or under-engineering
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Constitutional Validator?
Constitutional Validator is a subagent for Claude Code and Claude Cowork from the shanraisshan/claude-code-best-practice repository on GitHub. Validates roadmap items, features, and technical decisions against the project's constitution, principles, and core values. Ensures all proposals align with the mission, established methodology, and design principles before implementation proceeds.
How do I install Constitutional Validator in Claude Code?
Download constitutional-validator.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Constitutional Validator in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Constitutional Validator safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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