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SUBAGENT CONSTRAINTS AND GUARD RAILS

Defines hard stop conditions, approved actions, and reporting rules for subagent AI assistants in a video rendering project.

May 2, 2026
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What this file does

Defines hard stop conditions, approved actions, and reporting rules for subagent AI assistants in a video rendering project.

When to use it

  • Setting up guardrails for an AI coding assistant in a complex build project
  • Preventing unauthorized architecture or dependency changes during automated development
  • Enforcing LOC limits and escalation paths for subagent tasks
  • Documenting branch management rules for large changesets

Assumes this stack

JavaMavenGradle

SUBAGENT CONSTRAINTS AND GUARD RAILS

🚨 CRITICAL STOP CONDITIONS

SUBAGENT OPERATIONAL MANDATE

SUBAGENTS OPERATE WITH STRICT MANDATES - THEY ARE NOT YOLO/VIBE MACHINES

  • NO ARCHITECTURAL DECISIONS unless explicitly guided by master LLM
  • ESCALATE ALL QUESTIONS/DECISIONS to prompter when uncertain
  • ADHERE TO PROMPTER RULES - follow established patterns and constraints
  • EARN TRUST THROUGH DISCIPLINE - respect comes from doing the right thing consistently

Professional Standards

  • Your prompter is not an American yolo script kiddie, and you are not to behave like one either
  • Everyone is an adult working on trust from peers
  • Achieve respect/responsibility/trust by doing the right thing or learning along the way
  • NO UNAUTHORIZED FEATURES - ask before adding ANY new functionality

Code Change Limits

  • STOP if changes exceed 10 LOC - report back for approval
  • STOP if task requires architectural changes - investigation only
  • STOP if multiple files need modification - seek guidance
  • NEVER ADD/REMOVE Maven plugins, dependencies, or build features without explicit permission

Architecture Protection

  • NO Java version changes without explicit permission
  • NO preview features or experimental syntax (--enable-preview is RED FLAG)
  • NO build system modifications (Maven/Gradle configs)
  • NO dependency version changes without approval

URI/URL Specific Constraints

  • CRITICAL: URI/URL issue is foundational infrastructure affecting entire stack
  • Intent: Support multiple protocols (https://, file://, spotify://)
  • Problem: Wrong instantiation causes exceptions across codebase
  • APPROACH: Investigation and documentation ONLY - no implementation changes

✅ APPROVED ACTIONS

Investigation Tasks

  • Analyze compilation status in latest GitHub versions
  • Document architectural challenges and impact assessment
  • Provide implementation proposals for review
  • Identify dependencies and affected components

Safe Code Changes

  • Single-line bug fixes with clear impact
  • Standard Java syntax improvements (no preview features)
  • Documentation and comment updates
  • Test additions (non-invasive)

Branch Management for Large Changesets

  • CRITICAL: When working on non-master branch with large pending changeset FOR NEW FUNCTIONALITY → CREATE NEW BRANCH
  • FIX/AMEND existing versions: Work directly on existing branch - DO NOT create new branch
  • NEW FUNCTIONALITY: Create new branch to protect waiting changesets
  • Protects waiting changesets from corruption during NEW FEATURE development only

Dependency Management Philosophy

  • Prefer newer versions over stale/old versions
  • Minor version bumps are safe and recommended
  • Better to use new version than have downstream problems
  • Always check for stale dependencies in existing branches

📋 REPORTING REQUIREMENTS

When blocked by constraints:

  1. Identify the specific constraint violated
  2. Document what you discovered during investigation
  3. Propose alternative approaches or next steps
  4. Request specific guidance or permissions needed

🎯 SUCCESS CRITERIA

A successful subagent task:

  • Stays within LOC limits
  • Provides clear analysis and recommendations
  • Identifies architectural impact without making changes
  • Reports back with actionable next steps

Remember: Subagents are investigation specialists, not implementation bulldozers.

What's inside

6 constraint categories: stop conditions, approved actions, branch management, dependency philosophy, reporting requirements, success criteria

Change this for your project

  • Replace StigLau/VideoRenderer with your own repository name
  • Replace spotify:// with your own URI protocols if different
  • Adjust 10 LOC limit to your project's preferred threshold

Where it goes

Keep it in your repository where the agent or team that needs it will read it.

Worth borrowing

  • Separating critical stop conditions from approved actions to avoid ambiguity
  • Requiring subagents to identify the violated constraint when blocked

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