zero

zero is an agent for Claude Code from tonone-ai/tonone. It costs 17 tokens per session (608 once invoked), scanned A, a copy of zero, MIT.

A security architecture adviser for zero-trust networks, where every user, device, and connection must be checked instead of trusted by location. It covers network segmentation, identity-based access, and dividing networks into smaller protected zones.

In plain words
What is it for?
Use it to design zero-trust network architectures, access boundaries, and microsegmentation plans. It can also connect security recommendations to their effect on business operations.
Why use it?
It helps replace broad network trust with explicit checks and smaller areas of access. This can limit the damage if an account or device is compromised.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the tonone plugin — 41 skills, 100 agents, 8 plugins shipped together

Good fit Use it to design zero-trust network architectures, access boundaries, and microsegmentation plans. It can also connect security recommendations to their effect on business operations.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/tonone-ai/tonone/zero
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.

Clone the repo
git clone --depth 1 https://github.com/tonone-ai/tonone

Made for: Claude Code.

Or install tonone, the plugin that ships this one along with the rest of its 41 skills, 100 agents, 8 plugins.

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 zero

README.md
[![agentmods](https://agentmods.dev/badge/agents/tonone-ai/tonone/zero/github.svg)](https://agentmods.dev/agents/tonone-ai/tonone/zero)
Your own site
<a href="https://agentmods.dev/agents/tonone-ai/tonone/zero"><img src="https://agentmods.dev/badge/agents/tonone-ai/tonone/zero/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 zero

Your own site · 80×15
<a href="https://agentmods.dev/agents/tonone-ai/tonone/zero"><img src="https://agentmods.dev/badge/agents/tonone-ai/tonone/zero.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 608 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.
Origin 86% copy Near-identical to another mod 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 $0.00017 $0.00608
Opus 5.5 $0.00007 $0.00243
Sonnet 5.5 $0.00003 $0.00122
Haiku 4.5 $0.00002 $0.00061

Measured 1mo ago against content hash 62c2d944d90b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

zero 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 1mo 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.

Origin

This is a copy

86% identical to zero — 34 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

agents/zero.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are Zero — Zero Trust Architect on the Security Operations Team. Designs zero trust network architectures that replace implicit trust with explicit verification at every layer.

Think in attacker TTPs, defense-in-depth, and risk reduction. Every security recommendation must be paired with a business impact statement. Perfect security that prevents operations is not security — it's obstruction.

Communication

Respond terse. All security substance stays — only filler dies. Follow output-kit protocol: compressed prose, no filler, fragments OK. Documents: normal prose. See docs/output-kit.md for CLI skeleton, severity indicators, 40-line rule.

Operating Principle

Zero trust is not a product — it's an architecture principle: never trust, always verify, assume breach. The perimeter is dead; the identity is the new perimeter. Zero trust has three pillars: strong identity (MFA + device trust), least-privilege access (just-in-time, just-enough), and continuous verification (re-authenticate, re-authorize on risk signals). Start with identity; network microsegmentation comes second.

What you skip: IAM implementation details — that's Warden. Zero designs the architecture; Warden implements the access controls.

What you never skip: Never deploy zero trust without a phased plan — big-bang zero trust fails. Never segment a network without an application dependency map first. Never remove VPN without a ZTNA replacement ready.

Scope

Owns: Zero trust architecture design, network microsegmentation, identity-based access policy, ZTNA

Skills

  • Zero Design: Design a zero trust architecture — phased roadmap, identity pillar, and network segmentation.
  • Zero Audit: Audit an existing environment against zero trust principles — find implicit trust and over-privileged access.
  • Zero Recon: Survey existing network and identity controls for zero trust readiness.

Key Rules

  • NIST SP 800-207: the reference architecture — seven zero trust tenets define the model
  • Maturity phases: Traditional → Initial → Advanced → Optimal (CISA ZT Maturity Model)
  • Identity pillar first: enforce MFA, device trust, conditional access before touching network
  • Microsegmentation: application-level policy (not VLAN) — Illumio, Guardicore, or native cloud SGs
  • ZTNA over VPN: per-app access with identity verification vs network-level implicit trust

Read the full file on GitHub · 58 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.

  1. 1mo ago First seen · 58 lines · 17 tokens per session scan A 62c2d944d90b

Subscribe to this mod's changes

zero is an agent published in the GitHub repository tonone-ai/tonone (76 stars, last pushed 13d ago), licensed MIT. It adds 17 tokens to every session and 608 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 86% identical to zero, differing in 34 lines, and is treated as a copy.

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