# Holographic: Hermes Agent plugin

> Local fact-store memory provider: SQLite with FTS5 keyword search (word forms in English, Russian, Spanish, French, Portuguese, Indonesian, German, Hindi, Arabic, Bengali, Italian, Turkish, Polish and Dutch.

Canonical: https://hermeswatcher.com/plugins/holographic  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/holographic  
Last updated in catalog: 2026-10-25

Local fact-store memory provider: SQLite with FTS5 keyword search (word forms in English, Russian, Spanish, French, Portuguese, Indonesian, German, Hindi, Arabic, Bengali, Italian, Turkish, Polish and Dutch; Russian and English words of the same root at a lower weight, from bundled DerivBase.Ru (Apache-2.0) and Open English Wordnet (CC BY 4.0) pairs; German compounds and German and Spanish irregular verb forms from bundled Wikidata Lexemes tables (CC0); Chinese, Japanese, Korean and Thai by character n-grams, Chinese also split into words with jieba's dictionary (MIT), Traditional and Simplified Chinese compared as one through a bundled OpenCC table (Apache-2.0), Japanese spelling variants through SudachiDict's (Apache-2.0); synonyms through keywords the agent gives when it stores a fact), trust scores, entities with aliases and HRR (holographic reduced representation) recall, with no API key, network or model calls unless an optional online feature is switched on: search by meaning (embeddings: on) or rescoring by a cross-encoder (rerank: on), both off by default. The provider that shipped in-tree as plugins/memory/holographic, with the same provider name, config (plugins.hermes-memory-store) and memory_store.db, so `hermes update` moves existing users onto it; the schema change is additive and older versions keep working on the file. Taken over from Nous Research's handoff copy (NousResearch/hermes-plugin-holographic) and maintained by itpartypattaya; since 0.1.1 it fixes probe/reason/related/contradict, non-atomic writes and the never-written retrieval_count, gates recall by relevance without repeats, flags duplicates and conflicts when a fact is added, and honours the provider contract (read-only subagent contexts, hermes_home, mirror metadata, backup_paths); since 0.8.0 it keeps the history of every fact (change / end / correct / revert, search and list as_of a date) and `forget` erases a fact with all its versions from the file; since 0.16.0 a name guessed from a fact's text must be shaped like one and stays provisional until a second fact or a person confirms it, and entities can be renamed or deleted (the facts stay). Since 0.18.0 an optional, experimental second stage reorders the recall candidates with a cross-encoder at a /v1/rerank endpoint that answers in Cohere's shape without a key, such as llama-server (rerank: on, off by default). It does not raise hits: on the maintainer's held-out set (126 questions) it cut non-target facts in the top fi

## Good to know before installing

Local only unless an optional online feature (search by meaning or rescoring) is switched on: reads and writes one SQLite file per profile ($HERMES_HOME/memory_store.db unless db_path says otherwise), or with scope: user / chat / thread one file per user or chat in holographic-users/ or holographic-chats/ next to it; each fact version records where it was written (platform, chat type, chat and thread id, session id, the turn author's id and display name, and whether the person said it or the agent inferred it; never chat titles), shown in full by list, history and export and not in recall unless recall_source: short (date, display name, this or another chat); each confirmation of a fact by a person keeps its time, session id and that person's id (no text); forget deletes that and the confirmations with the fact and keeps only an HMAC of the text, keyed by a random key stored in the same file, as a tombstone; delete_entity removes a name, its aliases and links from the entity index (never a fact) and keeps an HMAC of each name the same way (not of an alias only a fact's text gave, which goes without one), and both rewrite the file so freed pages keep no copy; the first writable open

From the plugin's catalog listing.

## How to install

1. Install it. Hermes asks for any API keys it needs, then asks whether to turn it on.

```bash
hermes plugins install holographic
```

2. Said no? Turn it on later:

```bash
hermes plugins enable holographic
```

3. Restart Hermes so it loads the plugin.

Some plugins also need a sign-in or settings: see the official page. Memory plugins ask whether to become your memory provider instead. Steps follow the official plugins guide: https://hermes-agent.nousresearch.com/docs/user-guide/features/plugins

## Facts

- Category: Memory & notes
- Maintained by: itpartypattaya (Community)
- Needs: No API keys declared
- Requires Hermes: `>=0.21.5`
- Version: 0.18.3
- In the catalog since: 2026-10-02, updated 2026-10-25

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/holographic)
- [Source code](https://github.com/itpartypattaya/hermes-plugin-holographic/blob/7488ac32b78f983cff8484209686d59c9b330b76/README.md)
- [All plugins](https://hermeswatcher.com/plugins.md)

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