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Add persistent graph-based memory via mnemon. Agents recall past context before responding and remember insights after each turn.
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</> SKILL.md
add-mnemon.SKILL.md
---name: add-mnemon
description: Add persistent graph-based memory via mnemon. Agents recall past context before responding and remember insights after each turn.
---# Add Mnemon — Persistent Memory
Installs [mnemon](https://github.com/mnemon-dev/mnemon) in the agent container image. On each container start, `mnemon setup` registers Claude Code hooks that surface relevant memory before the agent responds and store new insights after each turn. Memory is written to the per-agent-group `.claude/` mount and survives container restarts.
## Provider Compatibility
mnemon hooks fire only under `--target claude-code`. Use this skill on agent groups that run the default Claude provider. The provider is the materialized `provider` key in each group's `container.json` (absent or `claude` = default Claude provider). Confirm it before applying:
```bash
grep -H '"provider"' groups/*/container.json 2>/dev/null # no match, or "provider": "claude" = Claude
```
If a group sets a different provider (e.g. `"provider": "opencode"`), it spawns its own process and never invokes the `claude` CLI, so the hooks registered by `mnemon setup` do not run for that group.
## Phase 1: Pre-flight
### Check if already applied
```bash
grep -q 'MNEMON_VERSION' container/Dockerfile && echo "Already applied" || echo "Not applied"
```
If already applied, re-run Phase 2 anyway — every step is idempotent and skips work that is already in place — then continue to Phase 3 (Verify).
Note the version (e.g. `v0.1.1`) — use it as `MNEMON_VERSION` in the next step.
## Phase 2: Apply Changes
### 1. Dockerfile — install mnemon binary
Insert the mnemon block immediately above the `# ---- Bun runtime` section of `container/Dockerfile` (skip if `grep -q 'MNEMON_VERSION' container/Dockerfile` already matches):
`>/dev/stderr 2>&1` routes all mnemon output to stderr (docker logs) so it doesn't interfere with the JSON stdin handshake between host and agent-runner.
### 3. Copy the integration tests
Both reach-ins are into container build/runtime files that aren't importable or typed (a GitHub-release binary in the Dockerfile, a shell line in the entrypoint), so structural tests guard them. Copy them into the host test tree:
pnpm exec vitest run src/mnemon-dockerfile.test.ts src/mnemon-entrypoint.test.ts
```
`mnemon-dockerfile.test.ts` asserts the `MNEMON_VERSION` ARG and `MNEMON_DATA_DIR` ENV are present (red if the install layer is dropped on an upgrade). `mnemon-entrypoint.test.ts` asserts the entrypoint invokes `mnemon setup --target claude-code` (red if the wiring is removed).
### 4. Rebuild and smoke-test the image
```bash
./container/build.sh
docker run --rm --entrypoint mnemon nanoclaw-agent:latest --version
Have a conversation with the agent, then start a new session and reference something from the earlier one. Mnemon should surface the relevant context automatically without you restating it.
## Memory Storage
Mnemon writes to `/home/node/.claude/mnemon/` inside the container, which maps to the per-agent-group `.claude/` directory on the host. To find the exact host path:
To reset all memory for an agent, stop the container and delete the `mnemon/` subdirectory from that host path.
## Troubleshooting
### `mnemon: command not found` in container
The image wasn't rebuilt after adding the Dockerfile layer. Run `./container/build.sh` and restart.
### Memory not persisting across restarts
Verify `MNEMON_DATA_DIR` resolves to a mounted path (not an in-container ephemeral directory):
```bash
docker exec <container> sh -c 'ls -la $MNEMON_DATA_DIR'
```
If the directory is empty after conversations, the mount is missing or the path is wrong. Check the host mount with the `docker inspect` command above.
### Agent not using past memory
`mnemon setup` writes hooks into `/home/node/.claude/settings.json`. Verify:
