hermes atlas
310·repos hermes·v0.21.5 ★ star this repo
home/memory & context/optmem-hermes-plugin

rarf/optmem-hermes-plugin

OptMem memory provider plugin for Hermes Agent (append-only, decay-compressed, BM25 search)

★ 23 langPython licenseMIT updated2026-10-02
view on github →
overview

Local append-only Hermes memory provider with decay compression, BM25 retrieval and reversible native-memory migration.

  • Append-only records with regex/BM25 search and drill-down
  • Hybrid default and verified backup-gated OptMem-only migration
  • Local summaries by default; explicitly opt-in host-routed LLM summaries
security note

Basic static screen: 2868af6 (November 9, 2026), not security certification. Forgetting summaries does not erase append-only raw records. Optional auto_nap with llm_summary sends memory blocks through the configured model. Back up configuration before migration.

full readme from github

OptMem for Hermes

Victor Taelin's original OptMem animation

Original design animation by Victor Taelin. This is an independent Hermes integration, not the upstream project.

Local memory that keeps the history and limits what enters your context. Store durable facts, search them with regex/BM25, and zoom from summaries back to original records. No API key or LLM call is needed by the memory engine.

Install

If optmem-hermes is listed in your Hermes catalog, install it with:

hermes plugins install optmem-hermes

If it is not listed in your catalog, install a published release into the Python environment used by Hermes:

pip install "git+https://github.com/rarf/optmem-hermes-plugin@v0.3.3"

Select the provider in your profile's config.yaml, then restart that profile's Hermes process:

memory:
  provider: optmem-hermes

hermes optmem-hermes status --json

Choose your mode

  • Hybrid (default): OptMem runs alongside native MEMORY.md / USER.md.
  • OptMem-only: replaces native memory injection after verified migration and backup.

To switch safely, inspect the migration plan first:

hermes optmem-hermes migrate --dry-run --json
hermes optmem-hermes migrate --split --json
hermes optmem-hermes check --json
hermes optmem-hermes mode optmem-only --yes --json

Native files are preserved. check is read-only and exits 1 until replacement readiness is satisfied. Use --hermes-home PATH to target one profile explicitly.

To undo the last mode switch without deleting OptMem data:

hermes optmem-hermes rollback --json

Good to know

  • Raw records are append-only. Summaries are lossy, but original details remain recoverable.
  • Later notes do not automatically supersede earlier ones: no semantic conflict resolution.
  • The wake digest is bounded but consumes model context.
  • forget removes summaries, not raw records.
  • Manual merges by default. Compaction happens only when the agent runs the requested optmem_nap ("nothing runs in the background"), matching upstream. auto_nap enables automatic compaction every ~10 turns; it is off by default.
  • Upgrading an older installation: change memory.provider: optmem to optmem-hermes only in the selected profile. Data paths stay unchanged; the CLI becomes hermes optmem-hermes.

Optional LLM summaries

Enable both auto_nap and llm_summary in <HERMES_HOME>/optmem/config.json to summarize through the host's optmem_summary auxiliary task. Both default to false; with either off there is no summary egress or token cost. Enabling both sends memory blocks to the selected provider and may incur costs. Failures fall back to the local extractor; raw records remain. See configuration and LLM routing.

More

Configuration, tools and technical reference · Catalog submission checklist · MIT license

The upstream animation is linked, not copied or rehosted. Upstream ships no LICENSE file; this repository's MIT license does not cover its media. No affiliation or endorsement is implied.