hermes-agent/plugins/memory/openviking

OpenViking Memory Provider

Context database by Volcengine (ByteDance) with filesystem-style knowledge hierarchy, tiered retrieval, and automatic memory extraction.

Requirements

• pip install openviking
• OpenViking server running (openviking-server)
• Embedding + VLM model configured in ~/.openviking/ov.conf

Setup

hermes memory setup    # select "openviking"

The setup can link to an existing ~/.openviking/ovcli.conf, copy its current connection values into Hermes, or create a minimal ovcli.conf when one does not exist.

Or manually:

hermes config set memory.provider openviking
echo "OPENVIKING_ENDPOINT=http://localhost:1933" >> ~/.hermes/.env

Config

All config via environment variables in .env:

Env Var	Default	Description
OPENVIKING_ENDPOINT	http://127.0.0.1:1933	Server URL
OPENVIKING_API_KEY	(none)	User/admin API key for authenticated servers
OPENVIKING_ACCOUNT	default	Tenant account for local/trusted mode
OPENVIKING_USER	default	Tenant user for local/trusted mode
OPENVIKING_AGENT	hermes	Hermes peer ID in OpenViking, used for peer-scoped memories

When OPENVIKING_API_KEY is set, Hermes lets OpenViking derive account/user identity from the key. In local or trusted deployments without an API key, Hermes sends OPENVIKING_ACCOUNT and OPENVIKING_USER as identity headers.

Tools

Tool	Description
viking_search	Semantic search with fast/deep/auto modes
viking_read	Read content at a viking:// URI (abstract/overview/full)
viking_browse	Filesystem-style navigation (list/tree/stat)
viking_remember	Store a fact directly with OpenViking content/write
viking_forget	Delete one exact viking:// memory file URI
viking_add_resource	Ingest URLs/docs into the knowledge base

Memory Writes And Deletes

viking_remember writes directly to OpenViking with POST /api/v1/content/write and mode=create. It creates peer-scoped memory files under viking://user/peers/${OPENVIKING_AGENT}/memories/...; OpenViking may return a canonical user-scoped form such as viking://user/default/peers/${OPENVIKING_AGENT}/memories/... in API-key mode. Explicit remembers do not depend on session commit extraction.

Hermes built-in memory tool additions are mirrored to OpenViking after the local memory operation succeeds:

Hermes action	OpenViking operation
add	content/write with mode=create under the configured peer memory namespace

Built-in replace and remove operations are not mirrored because Hermes native memory entries do not yet carry stable OpenViking file URIs. Use viking_forget when the user explicitly asks to delete a specific OpenViking memory URI.

viking_forget is intentionally narrow. It only accepts concrete user memory file URIs, such as viking://user/peers/hermes/memories/preferences/mem_abc123.md or the canonical viking://user/default/peers/hermes/memories/preferences/mem_abc123.md. Files directly under memories/, such as viking://user/default/memories/profile.md, are also allowed because OpenViking supports them. The tool rejects directories, resources, skills, sessions, generated summary files, and URIs with query strings or fragments. Use OpenViking's MCP, CLI, or admin APIs for broader resource and directory cleanup.