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.
npx agentmods add rules/localrivet/gomcp/stop-when-fixedgit clone --depth 1 https://github.com/localrivet/gomcpWhat 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.
| Model | Per session | Once 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 |
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.
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
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.
- 2d ago First seen · 56 lines · 484 tokens per session scan A de01ad9dbcf4
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.
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