zer0dex: Instructions file for Codex

AGENTS.md

zer0dex AGENTS.md is an instructions file for Codex, OpenCode from hermes-labs-ai/zer0dex. It costs 308 tokens per session, scanned A, original, Apache-2.0.

Instructions for zer0dex, a local memory system for AI agents that stores searchable information from Markdown files. It uses a compact index as a map to the full notes and provides commands for seeding, querying, and checking memory.

In plain words
What is it for?
Use it to initialize local memory, add Markdown notes, search stored information, check memory status, and run its offline tests.
Why use it?
It gives an agent a repeatable way to remember and retrieve local notes without hosted memory infrastructure. It also clarifies that the index is for navigation, not a complete copy of every detail.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is hermes-labs-ai/zer0dex's own configuration. It tells Codex and OpenCode how to work on zer0dex itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything zer0dex configures →

Reuse

Borrowing it

Nothing to install: this file belongs to hermes-labs-ai/zer0dex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/hermes-labs-ai/zer0dex/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/hermes-labs-ai/zer0dex

Made for: Codex, OpenCode.

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.

agentmods badge for zer0dex AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/hermes-labs-ai/zer0dex/agents-md"><img src="https://agentmods.dev/badge/instructions/hermes-labs-ai/zer0dex/agents-md/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.

agentmods 80×15 button for zer0dex AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/hermes-labs-ai/zer0dex/agents-md"><img src="https://agentmods.dev/badge/instructions/hermes-labs-ai/zer0dex/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 308 This file is loaded in full into every session.
When invoked 308 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00308 $0.00308
Opus 5.5 $0.00123 $0.00123
Sonnet 5.5 $0.00062 $0.00062
Haiku 4.5 $0.00031 $0.00031

Measured 2mo ago against content hash b1119be34be9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

zer0dex AGENTS.md 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 2mo 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.

AGENTS.md · 50 lines

What it actually says

AGENTS.md

zer0dex is a local dual-layer memory architecture for AI agents.

Use it for

  • giving agents a compressed markdown memory index plus semantic retrieval
  • seeding local memory from markdown or notes
  • querying memory through a local HTTP server before each agent message

Do not use it for

  • hosted memory infrastructure
  • compliance or governance controls
  • assuming benchmark numbers transfer unchanged to every domain

Minimal commands

pip install -e ".[dev]"
zer0dex --help
zer0dex init
python -m pytest tests/ -q

Output shape

  • zer0dex check: prerequisite validation with pass/fail lines
  • zer0dex seed: chunk and memory-count progress
  • zer0dex query: scored memory matches
  • zer0dex status: health plus memory count

Success means

  • local setup, seeding, serving, and querying all work from the CLI
  • tests pass offline with mocked dependencies
  • the README quick-start flow matches the actual CLI commands

Common failure cases

  • Ollama or required local models are not installed
  • users treat the compressed index as full memory instead of a navigation layer
  • teams expect zero tuning across very different memory workloads

Maintainer notes

  • keep benchmark claims tied to the published evaluation docs
  • keep the architecture framed as a local pattern and implementation, not a universal memory guarantee
  • do not commit local store directories or secrets
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.

  1. 2mo ago First seen · 50 lines · 308 tokens per session scan A b1119be34be9

Subscribe to this mod's changes

zer0dex AGENTS.md is an instructions file published in the GitHub repository hermes-labs-ai/zer0dex (64 stars, last pushed 18d ago), licensed Apache-2.0. It adds 308 tokens to every session, about $0.0012 per session on Opus 5.5. 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 2026-08-30.

Related

zer0dex AGENTS.md compared with instructions from other repositories

zer0dex AGENTS.md next to 6 instructions from other repositories
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