Memory Compounding

Memory is an index, not a transcript. Without review it accumulates stale entries that mislead future work. This skill is the discipline for keeping memory sharp, not just large.

When to use

• Monthly memory hygiene (AGENTS.md: "review both, prune stale entries").
• You notice the same gotcha recorded 3+ times.
• A memory entry contradicts the current code (trust the code).
• After a non-trivial debug/build cycle that produced a reusable learning.

The 5-outcome review rubric

For each entry in ~/.pi/agent/pi-hermes-memory/MEMORY.md, USER.md, failures.md, and the SQLite memories table (via memory_search), apply exactly one outcome:

Outcome	When	Action
Keep	Accurate + useful	Leave as-is
Update	Correct but incomplete	Add the missing detail
Consolidate	Same lesson appears multiple times	Merge into one entry, remove duplicates
Replace	Outdated or superseded by current code	Replace with the current truth
Delete	No longer applies (framework changed, code removed)	Remove

The promotion rule

When the same gotcha appears 3+ times in failures.md or across memory entries, promote it: write a dedicated reference file or a new skill section. A lesson that keeps recurring is a pattern, not a one-off — it earns a permanent home.

Solution docs (durable cross-project learnings)

After any non-trivial debug/build cycle, evaluate whether to write a solution doc to docs/solutions/:

• Write if: the problem took 3+ hypotheses to solve, OR the bug pattern appears in 3+ files, OR the solution contradicts a common assumption.
• Skip if: the fix was mechanical (typo, import error, one-line change).

Solution doc format:

# [Problem Title]
Category: debugging | architecture | testing | workflow | conventions
Tags: [comma-separated]
Date: YYYY-MM-DD
## Problem
[symptoms, not just the error message]
## What Didn't Work
[failed hypotheses and why]
## Solution
[what worked — with code example]
## Why
[the underlying principle]
## Prevention
[how to prevent this class of problem]

Ensure AGENTS.md or CLAUDE.md points to docs/solutions/ so agents can find it. This closes the loop: every solved problem makes the next one easier.

Don't

• Don't persist: whole diffs, verbose logs, celebratory narration, "looked correct" without evidence, duplicate notes, raw secrets/PII.
• Don't delete a memory just because it's old — delete it because it's wrong now.
• Don't skip the review when memory contradicts the code — trust the code, fix the memory.