Self-Correction Loop

Core Principles

1. Every correction is a compounding investment — A correction costs the user 30 seconds today but saves hours across all future sessions. Treat every correction as high-priority knowledge capture, not a one-time fix.

2. Generalize before storing — "Use TimeProvider not DateTime.Now in the Orders module" becomes "Always use TimeProvider instead of DateTime.Now/UtcNow across all modules." Specific corrections become class-level rules.

3. Categorize for retrieval — Rules organized by category (Code Style, Architecture, Naming, Testing, Data Access, API Design, Configuration, Performance) are findable. Uncategorized rules are forgotten.

4. Deduplicate aggressively — Before adding a rule, scan existing rules for overlap. Update an existing rule rather than adding a near-duplicate. Memory bloat defeats the purpose.

5. Review memory at session start — The first thing Codex should do in a new session is check MEMORY.md for project-specific rules. Knowledge captured but never reviewed is wasted effort.

Patterns

Correction Detection & Capture Flow

When a user corrects Codex's output, follow this exact sequence:

1. DETECT — User says something like:
   - "No, use X instead of Y"
   - "We don't do it that way here"
   - "That's wrong, it should be..."
   - "Always/Never do X in this project"
   - "Remember this for next time"

2. ACKNOWLEDGE — Confirm understanding of the correction
   "Got it — using HybridCache instead of IMemoryCache."

3. GENERALIZE — Extract the class-level rule
   Specific: "Don't use IMemoryCache in the Orders endpoint"
   General:  "Always use HybridCache instead of IMemoryCache — it provides
              stampede protection and L1+L2 caching out of the box."

4. CHECK — Scan MEMORY.md for existing related rules
   - If a related rule exists, UPDATE it (broader scope, better wording)
   - If no related rule exists, ADD a new one under the right category

5. STORE — Write to MEMORY.md under the appropriate category

6. CONFIRM — Tell the user what was captured
   "Added to Memory > Data Access: Always use HybridCache over IMemoryCache."

MEMORY.md Organization Format

Structure memory by category with consistent rule formatting:

# Project Memory

## Code Style
- Always use file-scoped namespaces — never block-scoped
- Use primary constructors for DI injection in services and handlers

## Architecture
- This project uses Vertical Slice Architecture — one file per feature operation

## Data Access
- Always use HybridCache over IMemoryCache — stampede protection + L1/L2
- Never use repository pattern over EF Core — use DbContext directly

## Testing
- Integration tests use ApiFixture base class — never raw WebApplicationFactory

Use categories: Code Style, Architecture, Naming, Data Access, API Design, Testing, Configuration, Performance. Each rule: one line, actionable, with rationale after the dash.

Rule Generalization: Specific to Class

Transform specific corrections into broadly applicable rules:

SPECIFIC CORRECTION:
"Don't use DateTime.Now in the CreateOrder handler"

GENERALIZATION STEPS:
1. Is this specific to CreateOrder? → No, it's a .NET-wide concern
2. Is this specific to handlers? → No, applies everywhere
3. What's the underlying principle? → TimeProvider is testable, DateTime is not
4. What's the broadest correct statement?

GENERALIZED RULE:
"Always use TimeProvider instead of DateTime.Now/UtcNow — TimeProvider is
injectable and testable. This applies to all production code."

Periodic Memory Audit

Every 5-10 sessions (or when memory exceeds 50 rules), audit for quality:

AUDIT CHECKLIST:
1. Remove rules that contradict each other — keep the most recent
2. Merge rules that overlap — combine into a single, clearer rule
3. Remove rules that are now obvious (e.g., captured early but now second nature)
4. Verify rules are still accurate — .NET evolves, patterns change
5. Check that categories are balanced — a category with 20+ rules needs subcategories

Session-Start Memory Review

At session start, read MEMORY.md and apply relevant rules proactively. Do not wait to be reminded of rules that were already captured.

Anti-patterns

Ignoring Corrections

// BAD — user corrects, Codex fixes but doesn't capture
User: "No, we use HybridCache here, not IMemoryCache"
Codex: "Fixed. Here's the updated code with HybridCache..."
*Next session: makes the same mistake*

// GOOD — fix AND capture
User: "No, we use HybridCache here, not IMemoryCache"
Codex: "Fixed. Here's the updated code with HybridCache.
         Added to Memory > Data Access: Always use HybridCache over IMemoryCache."
*Next session: checks memory, uses HybridCache from the start*

Overly Specific Rules

// BAD — rule is too narrow to be useful
"In the CreateOrder handler on line 47, use TimeProvider"

// GOOD — generalized to apply broadly
"Always use TimeProvider instead of DateTime.Now/UtcNow in all production code"

Never Reviewing Memory

// BAD — 50 rules captured, none ever reviewed
MEMORY.md grows to 200 lines, contains duplicates and contradictions,
Codex doesn't read it because it's too long to be useful

// GOOD — periodic audit keeps memory lean and accurate
MEMORY.md stays under 80 rules, well-categorized, no duplicates,
Codex reads it at session start and applies rules proactively

Storing Session-Specific Context

// BAD — temporary state saved as permanent memory
"Currently working on the Orders module refactor, file is at src/Orders/Handler.cs"

// GOOD — only permanent, reusable knowledge
"The Orders module uses VSA with one file per feature under Features/"

Decision Guide

Scenario	Action
User explicitly corrects Codex's code	Capture generalized rule in MEMORY.md
User says "remember this" or "always/never"	Capture exactly as stated, generalize if possible
Same correction given twice	High priority — the rule wasn't captured or wasn't reviewed
Correction is project-specific	Store in MEMORY.md with project context
Correction is universal .NET	Store in MEMORY.md — it applies to this project
MEMORY.md exceeds 50 rules	Trigger an audit — deduplicate, merge, prune
Starting a new session	Review MEMORY.md before writing any code
Rule contradicts an existing rule	Keep the most recent correction, remove the old one
Correction is about a one-time task	Don't store — only capture reusable patterns
User asks to forget a rule	Remove it from MEMORY.md immediately
Pattern observed but not yet confirmed	Create an instinct via instinct-system skill (confidence 0.3) instead of a MEMORY.md rule
Instinct reaches 0.9 confidence	Promote to MEMORY.md as a permanent rule (see instinct-system skill)