Hermes Tiered Memory

hermes-tiered-memory is a single Hermes Agent memory provider with a hot L1 (Mnemosyne) and durable L2 (Hindsight). It keeps the Hermes-facing namespace small and explicit, fails closed when dependencies or configuration are invalid, and promotes L1 writes through a durable local outbox.

Version: 1.0.2

Public tools

The provider exposes exactly these public memory tools:

• tiered_memory_search — search with query and an optional limit (1–100).
• tiered_memory_store — store content with optional object metadata.
• tiered_memory_delete — delete by memory_id.

The L1 and L2 adapters are internal implementation details. They do not register additional Hermes tools. This project does not add native hermes tiered-memory commands; its standalone commands are the hermes-tiered-memory console script described below.

Architecture

Hermes Agent
  └─ one CompositeProvider
       ├─ Mnemosyne L1 (profile/bank-scoped local memory)
       ├─ durable SQLite outbox (L1 write → asynchronous promotion)
       └─ Hindsight L2 (HTTPS, stable document identity, provenance metadata)

Reads are L1-first, with L2 recall and L1 backfill on a miss. Writes commit to L1 and enqueue promotion. Deletes create durable L1 tombstone state and enqueue L2 deletion. The provider uses one configured profile and bank scope; it does not use ambient Mnemosyne defaults.

Installation

Requirements: Python >=3.11,<3.14 and hermes-agent>=0.7.0.

Install the package and the live adapter extras in the same Python environment used by Hermes:

python3 -m pip install 'hermes-tiered-memory[mnemosyne,hindsight]'

For a source checkout, build and install a wheel, then install the Hermes plugin shim. HERMES_HOME must already exist:

python3 -m build --wheel
scripts/install_plugin.sh dist/hermes_tiered_memory-1.0.2-py3-none-any.whl "$HERMES_HOME"

The script installs the wheel, creates the tiered-memory plugin shim, and writes its plugin.yaml. Then set memory.provider: tiered-memory in the selected profile and restart Hermes. See INSTALL.md for discovery and troubleshooting details.

Provisioning and diagnosis

These are the supported standalone commands:

hermes-tiered-memory provision --help
hermes-tiered-memory doctor --help

Provision a signed endpoint configuration and a reviewable Hermes YAML patch:

hermes-tiered-memory provision \
  --output-dir ./tiered-memory-config \
  --key-id operator-ed25519-1 \
  --config-id hindsight-config-1 \
  --host hindsight.example.invalid \
  --auth-mode api_key

provision generates an Ed25519 private key, canonical protected config, detached signature, and patch. It never accepts or reads the Hindsight API key. Use a real HTTPS hostname and review the generated patch before applying it. --auth-mode is exactly api_key or none.

Run read-only checks with the generated files and public key:

hermes-tiered-memory doctor \
  --config ./tiered-memory-config/protected-config.json \
  --signature ./tiered-memory-config/protected-config.sig \
  --verification-key operator-ed25519-1=<base64-public-key>

doctor checks optional extras, protected-config validity, L1 availability, and optionally an L2 /health endpoint. It does not write the live replay state.

Configuration and secret boundary

The provider reads memory.tiered through Hermes' effective profile configuration. A minimal shape is:

memory:
  provider: tiered-memory
  tiered:
    hindsight:
      auth_mode: api_key # api_key or none
    verification_keys:
      - key_id: operator-ed25519-1
        algorithm: ed25519
        public_key_b64: <base64-public-key>
    protected_config:
      path: ./protected-config.json
      signature:
        path: ./protected-config.sig

profiles:
  <active-profile>:
    secrets:
      hindsight:
        api_key: <profile-secret> # required only for auth_mode: api_key

For api_key, the non-empty credential must exist in the active profile's Hermes-owned secrets at profiles.<active-profile>.secrets.hindsight.api_key. For none, that secret must be absent. The provider rejects both mismatches at startup. Credentials are not stored in the protected endpoint file, generated by provision, or sent by doctor; the API key is used only by the L2 HTTP adapter's authorization header.

Read docs/security.md for the protected-config and crypto boundary, docs/migration.md for compatibility and upgrade notes, and docs/ci-release.md for CI and release behavior.

Quickstart

1. Install hermes-tiered-memory[mnemosyne,hindsight] into the Hermes Python environment.
2. Run hermes-tiered-memory provision ... and keep the private key mode 0600.
3. Apply the generated memory.tiered patch after review; put any API key in the active profile's Hermes secret configuration, never in the patch.
4. Set memory.provider: tiered-memory and restart Hermes.
5. Run hermes-tiered-memory doctor ... before exercising the three public tools.

Documentation boundaries

README.md, INSTALL.md, and docs/ are user-facing documentation. The research/ directory, map.md, issues/, and DEVELOPER.md are internal design history or maintainer material, not product compatibility promises. Start with docs/internal-design-history.md if you need that distinction.

Development

python3 -m pip install -e '.[test]'
python3 -m pytest -q

See CHANGELOG.md and docs/release-notes-v1.0.0.md for the v1.0.0 release record.