aod-stack

A skill for selecting and managing technology-specific stack packs: collections of coding rules, security patterns, and agent guidance.

In plain words
What is it for?
Use it to list available packs, activate or remove one, or create project structure from the active pack.
Why use it?
It gives an AI coding agent conventions suited to the technologies used in a project.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/davidmatousek/tachi/aod-stack
Any agent
npx skills add davidmatousek/tachi --skill aod-stack
Clone the repo
git clone --depth 1 https://github.com/davidmatousek/tachi

Made for: Claude Code, Codex.

Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,526 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00042 $0.04526
Opus 5 $0.00021 $0.02263
Sonnet 5 $0.00008 $0.00905
Haiku 4.5 $0.00004 $0.00453

Measured 2d ago against content hash bc455dab8d27, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

aod-stack 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 2d 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

Copies of this mod

1 near-identical copy found in the catalogue:

  • aod-stack — 100% identical, 0 lines differ
.claude/skills/aod-stack/SKILL.md · 501 lines

How it starts

The opening of the file, as written. The whole thing — 501 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Stack Pack Management Skill

Activate, list, and manage stack packs that encode technology-specific conventions, security patterns, and agent persona supplements into AOD.

Subcommands

Command Purpose
/aod.stack use {pack-name} Activate a stack pack
/aod.stack list Show available packs and active status
/aod.stack remove Deactivate the active pack
/aod.stack scaffold Scaffold project structure from the active pack

/aod.stack use {pack-name}

Activate a stack pack by copying its rules, generating a persona loader, and persisting activation state.

Step 1: Validate the pack exists

  1. Check that stacks/{pack-name}/ exists as a directory.
  2. Check that stacks/{pack-name}/STACK.md exists and is non-empty.
  3. If the directory or STACK.md does not exist, display the error:
    Pack not found: {pack-name}
    
    Available packs:
      - {list each directory under stacks/ that contains a STACK.md}
    
    Use: /aod.stack use {pack-name}
    
    Then stop.

Step 2: Handle already-active pack

  1. Read .aod/stack-active.json if it exists.
  2. If another pack is active (the pack field differs from {pack-name}):
    • Prompt the user: "Pack {current-pack} is currently active. Switch to {pack-name}? This will deactivate {current-pack} first. (y/n)"
    • If the user declines, stop.
    • If the user confirms, execute full deactivation: a. Delete all files in .claude/rules/stack/. b. Delete .aod/stack-active.json.
  3. If the same pack is already active (pack field equals {pack-name}):
    • Prompt: "Pack {pack-name} is already active. Re-activate to update rules and persona loader? (y/n)"
    • If the user declines, stop.
    • If the user confirms, proceed (this refreshes rules from the pack source).

Step 3: Detect and resolve inconsistent state

Before proceeding, check for inconsistencies:

  • If .aod/stack-active.json exists but is not valid JSON:
    • Warn: "Inconsistent state: .aod/stack-active.json is corrupted. Cleaning up stale state."
    • Delete all files in .claude/rules/stack/.
    • Delete .aod/stack-active.json.
    • Then continue with activation.

Read the full file on GitHub · 501 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. 2d ago First seen · 501 lines · 42 tokens per session scan A bc455dab8d27

Subscribe to this mod's changes

aod-stack is a skill published in the GitHub repository davidmatousek/tachi (90 stars, last pushed 20d ago), licensed Apache-2.0. It adds 42 tokens to every session and 4,526 once invoked, about $0.0002 per session on Opus 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.

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