Short answer: coding agents forget because each session starts with a bounded context window. Unless durable facts are extracted, stored, and recalled, the next session cannot know what happened before.

The problem is not the model

A stronger model can reason better over the context it sees. It still cannot use context it was never given. If yesterday's architectural decision is not in today's prompt, the agent has to infer it again or ask you.

This is why “paste the README” helps but does not solve the problem. READMEs rarely contain your latest debugging notes, temporary constraints, branch-specific decisions, or personal preferences.

Common symptoms

The agent asks what repo or branch it is working in.
It repeats a failed approach you already rejected.
It forgets local environment details, aliases, or deployment steps.
It ignores coding conventions you corrected last week.
It loses the “why” behind a technical decision.

What a memory layer should do

A coding-agent memory layer should capture durable project facts without storing every transient turn. It should scope memory to the right repo or branch, keep global preferences available, and recall only what fits the current task.

Remnic is designed around that workflow. It stores memories locally, supports project-aware recall, and connects across multiple coding agents so Claude Code, Codex CLI, Cursor, and other MCP clients can share context.

The practical test

Ask whether the agent can start a new session and remember three things: what you are building, what decisions have already been made, and what traps to avoid. If the answer is no, you do not have agent memory yet. You have session history.