Lesson 1241 of 1570
Giving Your AI Agent a Memory File It Can Read and Write
A simple `memory.md` the agent can update lets it remember across runs without a database.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The big idea
- 2memory
- 3persistence
- 4state
Concept cluster
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Section 1
The big idea
Agents forget everything between runs by default. The cheapest fix is a single file the agent can read and append to — no vector DB, no infrastructure, just a Markdown scratchpad.
Some examples
- Claude with a memory.md tool remembers your name on the third session even though it's a stateless API.
- An agent appends 'user prefers dark mode' to its memory after you say so once.
- ChatGPT given a memory file recalls last week's project context when you start a new chat.
- A coding agent writes 'project uses pnpm not npm' to memory and stops suggesting npm commands.
Try it!
Add a readMemory and appendMemory tool to any agent. Tell it to remember three things across two sessions.
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End-of-lesson quiz
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