Write structured entries to memory/YYYY-MM-DD.md instead of free-form text. This improves recall via memory_search.
When to Use
After any meaningful action:
- Made a decision or received a decision from the founder
- Discovered a new fact (via Exa, PostHog, web, conversation)
- Found an insight or pattern
- Completed a task with a result
- Updated a hypothesis
Entry Format
### HH:MM — [TYPE] Title
What happened (1-2 sentences).
Facts:
- concrete fact 1
- concrete fact 2
Concepts: keyword1, keyword2, keyword3 Files: path/to/file (if changed)
## Types (TYPE)
| Type | When |
|------|------|
| DECISION | Decision made (by whom, why, what changes) |
| FACT | New confirmed fact (source required) |
| INSIGHT | Pattern, connection, conclusion from data |
| TOOL | Finding from tool usage (PostHog, Exa, web) |
| TASK | Completed task with result |
| HYPOTHESIS | Created/updated/killed a hypothesis |
## Rules
1. **Facts must be verifiable.** "Signups = 0 for 7 days" (ok). "Seems low" (no).
2. **Concepts are for search.** Write keywords you'd use to find this entry later via `memory_search`. Include: names, products, metrics, topics.
3. **Files — only if changed.** List only files that were created or modified.
4. **One entry = one topic.** Don't mix a decision + tool finding in one entry.
5. **Narrative < 50 words.** Context goes in facts, not prose.
## Promotion to MEMORY.md
A fact deserves promotion to MEMORY.md if:
- It changes understanding of wedge, ICP, constraint
- It's confirmed 2+ times from different sources
- It affects current strategy or hypothesis
On promotion — add to the appropriate MEMORY.md section and remove outdated info.
## Example
```markdown
### 14:30 — [TOOL] PostHog: 41% activation step failures
PostHog query revealed a high percentage of errors during the key activation step.
**Facts:**
- 41% of `primary_resource_action` events have `processingStatus=failed` (30d)
- Main errors: timeout on large inputs (above the documented size limit)
- Affects the `first_primary_resource_added -> primary_resource_processed` funnel stage
**Concepts:** activation-blocker, funnel-drop, PostHog, TTFV
**Files:** —