hermes-maximem-vity 1.0.3

Vity (Maximem AI) memory provider plugin for Hermes Agent

Vity Memory for Hermes Agent

Vity by Maximem AI — persistent, cross-session semantic memory for Hermes Agent, distributed as a standalone plugin.

Vity gives the agent a long-term memory graph (facts, preferences, episodes, knowledge, profile). It automatically recalls relevant context before each turn and captures the conversation after each turn, so the agent remembers users and projects across sessions.

Built on the maximem-vity-sdk Python client.

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Install

First, get an API key at app.maximem.ai/api-keys (starts with mx_). Then:

pip install hermes-maximem-vity
hermes-maximem-vity install

hermes-maximem-vity install does everything in one step:

1. Copies the plugin into ~/.hermes/plugins/vity/, where Hermes discovers it.
2. Prompts for your API key and saves it to ~/.hermes/.env (no duplicates).
3. Activates the provider (memory.provider: vity).

It prints ✅ All set! when finished. Start the agent with hermes.

Non-interactive / scripted installs — pass the key as a flag to skip the prompt:

hermes-maximem-vity install --api-key mx_your_key

Hitting a PEP-668 "externally-managed-environment" or "pip: command not found" error?

System Python (e.g. Homebrew) blocks global pip install. Use pipx (recommended) or a virtual environment:

pipx install hermes-maximem-vity        # install pipx first if needed: brew install pipx
hermes-maximem-vity install

You don't need to match Python versions — the maximem-vity-sdk dependency is installed into Hermes' own environment automatically.

Verify

hermes memory status     # shows: vity ← active
hermes vity status       # API key set ✓, connection ok ✓

Update / remove

pip install -U hermes-maximem-vity && hermes-maximem-vity install --force   # update
hermes-maximem-vity uninstall                                               # remove

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Configuration

API key (secret — stored in ~/.hermes/.env):

Env var	Required	Description
MAXIMEM_API_KEY	✅	Your Maximem API key (mx_…). VITY_API_KEY is also accepted.

The API key owns the memory space — use a separate key per account that needs isolated memories.

Tunables (optional, non-secret — $HERMES_HOME/vity.json, created on install):

Key	Default	Description
auto_recall	true	Inject relevant memories before each turn
auto_capture	true	Capture the conversation after each turn
max_recall_tokens	1000	Token budget for recalled context
min_prompt_length	5	Skip recall for very short prompts

Self-hosted backend (optional): set MAXIMEM_ENDPOINT (or endpoint in vity.json) to point at a non-default Maximem API URL.

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How it works

• Recall before each turn — relevant memories are fetched in the background and injected as context, so the agent starts each turn already aware of the user.
• Capture after each turn — the user/assistant exchange is saved to long-term memory.
• Memory mirroring — when Hermes' built-in memory tool records a fact, it is also stored in Vity so it participates in semantic recall.

All network calls run on background threads, so the agent loop never blocks.

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Agent tools

The plugin exposes four tools to the agent:

Tool	Parameters	Purpose
vity_recall	query (required), top_k (default 10, max 50)	Semantic search of stored memories.
vity_profile	—	Retrieve the user's full stored memory profile.
vity_store	content (required), memory_type (fact/preference/emotion/episode/knowledge/profile)	Save a new memory.
vity_forget	query, dry_run (default true)	Delete matching memories (previews first).

In chat, this is transparent: ask the agent to "remember that …" and it calls vity_store; ask "what do you know about …" and it calls vity_recall. No special commands are required.

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CLI

Manage memory directly from the terminal:

hermes vity status                          # config + live connection check
hermes vity search "favorite color"         # semantic search
hermes vity search "deadlines" --limit 20 --json
hermes vity store "I prefer dark mode" --type preference
hermes vity forget "old project"            # dry-run (preview)
hermes vity forget "old project" --yes      # confirm deletion

To (re)activate the provider, use hermes config set memory.provider vity. Avoid the interactive hermes memory setup wizard — buffered/pasted terminal input can drop the selection and leave the provider unset.

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Development

pip install -e ".[dev]"
pytest -q

Tests stub the Hermes host modules (agent.memory_provider, tools.registry, hermes_constants, utils) so they run without a full Hermes checkout — see tests/conftest.py.

Layout

Path	Purpose
src/hermes_maximem_vity/installer.py	The hermes-maximem-vity console command (install / uninstall / status).
src/hermes_maximem_vity/payload/provider.py	VityMemoryProvider + register() — copied to ~/.hermes/plugins/vity/__init__.py on install.
src/hermes_maximem_vity/payload/cli.py	The hermes vity … subcommands.
src/hermes_maximem_vity/payload/plugin.yaml	Plugin manifest (dependencies, required env).
src/hermes_maximem_vity/payload/vity.json.example	Tunables template (seeded to vity.json on install).
tests/	Unit tests + host-module stubs.

License

MIT — see LICENSE.

Support

• Documentation: https://docs.maximem.ai/vity
• API keys: https://app.maximem.ai/api-keys