sbx/hermes-agent-kit repository overview

⁠hermes-agent

A standalone sandbox kit (kind: sandbox, the v2 spec naming) for Hermes Agent⁠ — the self-improving AI agent by Nous Research⁠. It creates skills from experience, improves them during use, maintains persistent memory across sessions, supports 200+ models via OpenRouter, and includes a built-in cron scheduler and multi-platform gateway (Telegram, Discord, Slack, WhatsApp).

The kit runs on a pre-baked image — Hermes and its dependencies are installed at image-build time, not at sandbox creation, so a new sandbox starts in seconds instead of waiting on a multi-minute install. The sandbox has no Docker engine (unlike this kit's previous base image): Hermes' default terminal backend runs commands in the sandbox itself and does not need one, so if your workflow shells out to docker inside the agent, it will not find it here.

⁠Supported providers, and what is not baked in

Only Anthropic, OpenAI, and OpenRouter are installed and reachable — see "Setup" and "How auth works" below. Hermes supports a much wider set of model providers, search backends, messaging-platform gateways, and TTS/STT engines, and normally installs each one's SDK from PyPI the first time you use it. This image disables that: it is sealed (no writable install target), so an attempt to use anything outside the three supported providers fails immediately with FeatureUnavailable naming the exact pip install command Hermes would have run, rather than hanging or failing opaquely against a network policy that does not allow PyPI. That message is expected — it means the feature genuinely is not part of this kit, not that something is broken.

⁠Prerequisites

An API key for at least one supported provider — Anthropic, OpenAI, or OpenRouter. Register it once with sbx secret set-custom; the value is stored in the host secret store and never enters the sandbox directly.

⁠Setup

⁠Anthropic

sbx secret set-custom -g \
    --host api.anthropic.com \
    --env ANTHROPIC_API_KEY \
    --placeholder "sk-ant-{rand}" \
    --value "$ANTHROPIC_API_KEY"

⁠OpenAI

sbx secret set-custom -g \
    --host api.openai.com \
    --env OPENAI_API_KEY \
    --placeholder "sk-{rand}" \
    --value "$OPENAI_API_KEY"

⁠OpenRouter (200+ models)

sbx secret set-custom -g \
    --host openrouter.ai \
    --env OPENROUTER_API_KEY \
    --placeholder "sk-or-{rand}" \
    --value "$OPENROUTER_API_KEY"

⁠Usage

sbx run --kit "docker.io/sbx/hermes-agent-kit:latest" hermes-agent

Or from a git URL targeting this repo:

sbx run --kit "git+https://github.com/docker/sbx-kits-contrib.git#dir=hermes-agent" hermes-agent

Or with a local clone of this repo:

sbx run --kit ./hermes-agent/ hermes-agent

Once inside the agent, use hermes model to choose a provider and model, then start chatting.

⁠How auth works

Each entry in the kit's credentials: list maps a provider to a domain and the header to inject on outbound requests to that domain:

• api.anthropic.com → injects x-api-key: <key>
• api.openai.com → injects Authorization: Bearer <key>
• openrouter.ai → injects Authorization: Bearer <key>

When Hermes makes an outbound request to one of these hosts, the sandbox proxy intercepts it, looks up the matching credential on the host, and injects the auth header. The placeholder value (e.g. sk-ant-<random>) in the container environment is never sent to the provider.

⁠Anthropic: API key vs Claude subscription (OAuth)

Anthropic accepts a credential in exactly one shape per kind, and rejects the other: an API key goes out as x-api-key, a subscription (OAuth) token as Authorization: Bearer with the OAuth beta headers. Hermes picks the shape from where the token resolved — resolve_anthropic_token() reads ANTHROPIC_TOKEN/CLAUDE_CODE_OAUTH_TOKEN, then ANTHROPIC_API_KEY, then ~/.claude/.credentials.json — so the kit's job is to leave exactly the right one in place.

An API key wins when the host has one. Without the oauth: block a host whose only Anthropic credential is an OAuth login would get no usable credential at all: the API-key sentinel would reach Anthropic unswapped and every model call would 401.

The OAuth path needs no translation step, because the file the engine materializes is a store Hermes reads natively — and refreshes in place, which is why it is preferred over a static env token upstream. The file holds sentinels, not real tokens; the proxy swaps them on egress to api.anthropic.com and performs the refresh against platform.claude.com when the access token nears expiry.

What the kit does have to do is get out of the way. ANTHROPIC_API_KEY is set to the proxy-managed sentinel unconditionally — the injection is declared by the kit, not by whether a credential exists — and a non-empty value there deliberately shadows any discovered OAuth credential upstream. So hermes-anthropic-auth.sh runs at every container start and drops the sentinel in the two cases where it is wrong: an OAuth login (Hermes should read the credential file instead) and no credential at all (otherwise Hermes reports an invalid key for a credential that never existed). It writes the decision to ~/.hermes/anthropic-auth.env, which the entrypoint sources; a ~/.profile hook carries it into sbx exec -- sh -lc '…' shells too.

Two things worth knowing: the discriminator is the materialized credential file, not SBX_CRED_ANTHROPIC_MODE — that variable reports none for an OAuth login just as it does for no credential at all, so nothing may key off it; and the engine writes the credential file at sandbox start, so entries you add inside the sandbox do not survive a restart.

Do not authenticate from inside the sandbox. A claude setup-token or a Hermes-native /login run in the container writes a real token into ~/.claude/.credentials.json or ~/.hermes/.anthropic_oauth.json, which defeats proxyManaged: true: from there it is readable by the agent and by anything the agent runs, and this kit's allowlist includes hosts it could be sent to. Keep credentials host-side.

⁠Removing stored secrets

sbx secret rm -g --host api.anthropic.com
sbx secret rm -g --host api.openai.com
sbx secret rm -g --host openrouter.ai