stop-when-fixed

A coding rule that says to stop making changes once the original problem is fixed, the tests pass, and the requirements are met.

In plain words
What is it for?
Use it during bug fixes and feature work to decide when implementation and cleanup are complete.
Why use it?
It reduces the risk of introducing new bugs or unnecessary complexity while polishing code that already works.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/localrivet/gomcp/stop-when-fixed
Clone the repo
git clone --depth 1 https://github.com/localrivet/gomcp

Made for: Cursor.

Per session 484 This file is loaded in full into every session.
When invoked 484 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00484 $0.00484
Opus 5 $0.00242 $0.00242
Sonnet 5 $0.00097 $0.00097
Haiku 4.5 $0.00048 $0.00048

Measured 2d ago against content hash de01ad9dbcf4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

stop-when-fixed scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/stop-when-fixed.mdc · 56 lines

What it actually says

  • Stop When Fixed: Know When to Step Back

    • Like a salesperson who stops talking once the sale is made, stop changing code once the issue is fixed
    • Unnecessary "improvements" risk introducing new bugs and complications
    • When tests pass and requirements are met, the task is complete
  • Signs It's Time to Stop

    • ✅ The original issue is verifiably fixed
    • ✅ Tests pass and the feature works as expected
    • ✅ The code is reasonably clean and maintainable
    • ✅ User/client has confirmed the solution works
  • Resist the Urge to "Perfect" Working Code

    // ✅ DO: Stop when the problem is solved
    func SaveUserPreference(userID string, preference string) error {
      // Simple solution that works reliably
      return db.SavePreference(userID, preference)
    }
    
    // ❌ DON'T: Keep "improving" after the fix
    func SaveUserPreference(userID string, preference string) error {
      // Unnecessary complexity added after the fix
      metrics.TrackEvent("save_preference_attempt")
      if cached, err := cache.GetPreference(userID); err == nil && cached == preference {
        return nil // Unneeded optimization
      }
      err := db.SavePreference(userID, preference)
      if err == nil {
        cache.SetPreference(userID, preference) // Added caching that wasn't required
        metrics.TrackEvent("save_preference_success")
      }
      return err
    }
    
  • Document What Works and Why

    • When a solution works, document it clearly
    • Explain the approach that succeeded and any failed attempts
    • This helps future developers understand why decisions were made
  • When Refactoring is Appropriate

    • Only refactor working code as a separate, deliberate task
    • Get the original fix approved and merged first
    • Create a new task specifically for refactoring or improvements
    • Ensure thorough testing of any refactoring changes
  • The Principle of Minimum Viable Fixes

    • The best fix is often the simplest one that reliably solves the problem
    • Complex solutions create more potential points of failure
    • Optimize for readability and maintainability, not cleverness
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 56 lines · 484 tokens per session scan A de01ad9dbcf4

Subscribe to this mod's changes

stop-when-fixed is a cursor rule published in the GitHub repository localrivet/gomcp (51 stars, last pushed 1y ago), licensed MIT. It adds 484 tokens to every session, about $0.0024 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.