Which development phases does it monitor?

Plan Guardian is designed to run alongside any phase, but it is most effective during implementation and testing phases (Phases 5 through 11) where the risk of architectural drift is highest.

Can I ignore a drift warning if the change is intentional?

Yes, you can acknowledge a warning by choosing to 'continue anyway' with a justification, or you can explicitly update the plan digest to reflect the new project direction.

How does Plan Guardian know what the original plan is?

It automatically generates a lightweight 'plan digest' from your PRD.md, ideation summaries, and architectural decision records found in your repository's .claude directory.

Does it interrupt my workflow for every minor change?

No, it uses a sampling mechanism and configurable sensitivity levels to ensure it only alerts you when significant deviations or architecture violations are detected based on weighted criteria.

Plan Guardian

Name: Plan Guardian
Author: majiayu000

bymajiayu000

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Analytics & Monitoring

Monitors active development in real-time to detect and prevent architectural drift and scope creep from the original project plan.

Plan Guardian acts as an automated background oversight agent for Claude Code, continuously sampling work-in-progress against a predefined plan digest. By analyzing file changes and command outputs against the core PRD and architectural decisions, it catches misalignment early—before significant rework is required. It provides tiered response levels ranging from silent notices to full work halts, ensuring that developers remain focused on the project's essential requirements and technical constraints while maintaining a detailed audit log of all deviations and approved plan updates.

Key Features

01Configurable sampling rates based on development phase sensitivity

0264 GitHub stars

03Real-time drift detection against PRD and architectural patterns

04Contextual warning injection with tiered response levels (Warn, Drift, Halt)

05Automated plan digest generation from project documentation

06Detailed audit logging of all assessments and manual overrides

Use Cases

01Ensuring MVP focus by flagging deferred features during the active build phase

02Enforcing architectural patterns and technical constraints in complex codebases

03Preventing accidental scope creep during rapid TDD implementation phases

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add majiayu000/claude-skill-registry plan-guardian

For use in Claude.ai and ChatGPT

Download Skill