What is hermes-session?

A session guide for an operator agent working with agentOS, a capability-controlled operating system built on the seL4 microkernel. It defines what the agent may inspect and what it must not modify or build.

Inspecting memory, guest systems, threads, and hardware, and reporting structured snapshots from agentOS.

It gives the agent a clear scope for reporting system state while preventing it from taking unsupported actions in the repository.

hermes-session — Skill for Claude Code and Codex by jordanhubbard

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add jordanhubbard/agentos --skill hermes-session

Clone the repo

git clone --depth 1 https://github.com/jordanhubbard/agentos

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jordanhubbard/agentos/hermes-session/github.svg)](https://agentmods.dev/skills/jordanhubbard/agentos/hermes-session)

Your own site

<a href="https://agentmods.dev/skills/jordanhubbard/agentos/hermes-session"><img src="https://agentmods.dev/badge/skills/jordanhubbard/agentos/hermes-session/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jordanhubbard/agentos/hermes-session"><img src="https://agentmods.dev/badge/skills/jordanhubbard/agentos/hermes-session.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 786 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00786
Opus 5	$0.00000	$0.00393
Sonnet 5	$0.00000	$0.00157
Haiku 4.5	$0.00000	$0.00079

Measured 6d ago against content hash 6cef0708c357, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

hermes-session scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/hermes-session/SKILL.md · 76 lines

How it starts

The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hermes operator session (agentOS)

This file is the session context an operator agent (Hermes or any other LLM CLI) loads when attached to agentOS. It is not a UI. It is not a PD.

What agentOS is

agentOS is a capability-secured OS on seL4. Guests (Linux, FreeBSD) and native agents consume virtualizers (serial, net, blk). seL4 is the only kernel-mode code. Native agents are not TCB.

What this session may do (now)

Read and report. Call the inspect snapshot ABI:

Header: platform/include/platform/inspect.h
Fill: aos_inspect_fill
Structured text: aos_inspect_format (key=value lines)

The snapshot covers:

Memory: untyped pool total/used, guest RAM size, PD count
Threads: PD index, name, priority, state (running/blocked/idle/unknown)
Hardware: arch, UART PA, GIC distributor PA, emulated virtio-net IPA/IRQ

Host tests: tests/platform/test_inspect_snapshot.c (via make test-host). Those tests are a pre-filter. They do not prove a live seL4 query.

What this session must not do

No HTML/JS/TUI in this repository. Hermes-the-product is a client.
No JavaScript Protection Domain. No Node in kernel/, services/, or userspace/servers/.
Do not extend term_server. It is museum. Interactive bytes later ride serial_virt (generic serial), same as other native clients.
Do not store API keys or provider secrets in this tree. The user supplies them to the client at attach time.
Do not compose, spawn, or mutate services in this slice. Inspect is read-only (AOS_INSPECT_OP_SNAPSHOT and friends). Compose is a later contract with its own tests.
Do not claim host tests as guest-boot or live-IPC proof.

Architecture (target)

user + API key + provider URL
        │
        ▼
Hermes (or other LLM CLI)     ← guest userspace or external process
        │  SKILL.md (this file) + inspect report
        ▼
serial_virt client (PTY-shaped session is a serial client)
        │
        ▼
inspect snapshot (C structs)  ← filled from root-task observations

Read the full file on GitHub · 76 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

6d ago First seen · 76 lines · 0 tokens per session scan A 6cef0708c357

Subscribe to this mod's changes

hermes-session is a skill published in the GitHub repository jordanhubbard/agentos (29 stars, last pushed yesterday), licensed BSD-2-Clause. It costs nothing until one of its globs matches a file; then it loads 786 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.

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