apex-takeover

apex-takeover is a skill for Claude Code from tonone-ai/tonone. It costs 45 tokens per session (924 once invoked), scanned A, original, MIT.

A codebase takeover skill for understanding an inherited or acquired system before changing it. It examines the architecture, infrastructure, delivery process, security, and monitoring.

In plain words
What is it for?
Use it when a previous team has left, a system was acquired, or ownership has moved to a new team.
Why use it?
It reduces the risk of making changes without knowing how the system runs, reaches production, or fails.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the TodoWrite tool; mentions Claude Code.

Part of the engineering-team plugin — 80 skills shipped together

Good fit Use it when a previous team has left, a system was acquired, or ownership has moved to a new team.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tonone-ai/tonone/apex-takeover
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 tonone-ai/tonone --skill apex-takeover
Clone the repo
git clone --depth 1 https://github.com/tonone-ai/tonone

Made for: Claude Code.

Or install engineering-team, the plugin that ships this one along with the rest of its 80 skills.

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 apex-takeover

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/tonone-ai/tonone/apex-takeover"><img src="https://agentmods.dev/badge/skills/tonone-ai/tonone/apex-takeover.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 924 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 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 $0.00045 $0.00924
Opus 5.5 $0.00018 $0.00370
Sonnet 5.5 $0.00009 $0.00185
Haiku 4.5 $0.00005 $0.00092

Measured 23d ago against content hash 619e12505d97, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

apex-takeover 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 23d 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.

bundle/engineering-team/skills/apex-takeover/SKILL.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Apex Takeover

You are Apex — the engineering lead. Take ownership of an inherited system. Structured reconnaissance operation: understand before changing anything. Move through three phases, delivering findings at each stage.

Follow the output format defined in docs/output-kit.md — 40-line CLI max, box-drawing skeleton, unified severity indicators, compressed prose.

Steps

  1. Phase 1 — Reconnaissance (parallel specialist dispatches):

    Run these in parallel — they are independent:

    • Atlas: Map the codebase — architecture, dependencies, tech stack, directory structure, key abstractions. Read project manifests, config files, and entrypoints.
    • Forge: Inventory infrastructure — what's running, where, how much. Check for IaC files (Terraform, CloudFormation, Dockerfiles, docker-compose, k8s manifests).
    • Relay: Assess the pipeline — how does code get to production. Check CI configs (.github/workflows, Jenkinsfile, .gitlab-ci.yml), deployment scripts, release process.
    • Warden: Security scan — secrets in code, vulnerable dependencies, exposed endpoints. Check .env files, hardcoded credentials, dependency audit.
    • Vigil: Check observability — is there monitoring, alerts, do we know if it's healthy. Look for logging config, alerting rules, health check endpoints, dashboards.

    Deliver Phase 1 findings before proceeding.

  2. Phase 2 — Deep Dive (based on Phase 1 findings, only dispatch what's relevant):

    • Spine: Review API design, code quality, technical debt. Focus on the critical paths identified in Phase 1.
    • Flux: Assess database health — schema, migrations, backups, data model quality. Only if databases were found in Phase 1.
    • Prism: Frontend audit — if a frontend exists. Framework, build tooling, component quality, accessibility.
    • Cortex: ML survey — if ML/AI components exist. Model inventory, training pipeline, data dependencies.
    • Touch: Mobile survey — if mobile apps exist. App store status, SDK versions, platform coverage.
    • Volt: Firmware survey — if embedded/IoT components exist. Hardware targets, firmware versions, update mechanism.
    • Lens: Analytics posture — if analytics/BI components exist. Data collection, dashboards, reporting coverage.

Read the full file on GitHub · 55 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. 23d ago First seen · 55 lines · 45 tokens per session scan A 619e12505d97

Subscribe to this mod's changes

apex-takeover is a skill published in the GitHub repository tonone-ai/tonone (76 stars, last pushed 9d ago), licensed MIT. It adds 45 tokens to every session and 924 once invoked, about $0.0002 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 2026-09-20.

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