pact-architecture-patterns

pact-architecture-patterns is a skill for Claude Code from Synaptic-Labs-AI/PACT-Plugin. It costs 91 tokens per session (2,500 once invoked), scanned A, original, MIT.

A reference for designing software architecture with reusable patterns, component guidelines, API contracts, and C4 diagrams. C4 is a way to document a system from broad context down to detailed components.

In plain words
What is it for?
Planning components, defining API boundaries, selecting design patterns, creating architecture diagrams, and reviewing architectural decisions.
Why use it?
It gives teams a shared structure for deciding system boundaries and explaining how users, services, and components interact.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the PACT plugin — 21 skills, 14 commands, 13 agents, 11 hooks shipped together

Good fit Planning components, defining API boundaries, selecting design patterns, creating architecture diagrams, and reviewing architectural decisions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/synaptic-labs-ai/pact-plugin/pact-architecture-patterns
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 Synaptic-Labs-AI/PACT-Plugin --skill pact-architecture-patterns
Clone the repo
git clone --depth 1 https://github.com/Synaptic-Labs-AI/PACT-Plugin

Made for: Claude Code.

Or install PACT, the plugin that ships this one along with the rest of its 21 skills, 14 commands, 13 agents, 11 hooks.

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 pact-architecture-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/synaptic-labs-ai/pact-plugin/pact-architecture-patterns.svg)](https://agentmods.dev/skills/synaptic-labs-ai/pact-plugin/pact-architecture-patterns)
Your own site
<a href="https://agentmods.dev/skills/synaptic-labs-ai/pact-plugin/pact-architecture-patterns"><img src="https://agentmods.dev/badge/skills/synaptic-labs-ai/pact-plugin/pact-architecture-patterns.svg" alt="Measured on agentmods" height="20"></a>
Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,500 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 warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Tool Misuse · line 127
    Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
    Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00091 $0.02500
Opus 5 $0.00046 $0.01250
Sonnet 5 $0.00018 $0.00500
Haiku 4.5 $0.00009 $0.00250

Measured 8d ago against content hash ec2e887471de, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

pact-architecture-patterns 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 8d 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.

pact-plugin/skills/pact-architecture-patterns/SKILL.md · 418 lines

How it starts

The opening of the file, as written. The whole thing — 418 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PACT Architecture Patterns

Design patterns and templates for the Architect phase of PACT. This skill provides quick references for architectural decisions and links to detailed pattern implementations.

C4 Model Quick Reference

The C4 model provides four levels of abstraction for system architecture documentation.

Level 1: System Context

Shows your system as a box surrounded by users and other systems it interacts with.

                    +------------------+
                    |   External User  |
                    +--------+---------+
                             |
                             v
+------------------+    +----+----+    +------------------+
| Payment Gateway  |<-->|   Your  |<-->|   Email Service  |
+------------------+    | System  |    +------------------+
                        +---------+
                             ^
                             |
                    +--------+---------+
                    |   Admin User     |
                    +------------------+

What to include:

  • Your system (single box)
  • Users/personas
  • External systems
  • High-level interactions

Level 2: Container

Shows the high-level technical building blocks (not Docker containers).

+----------------------------------------------------------------+
|                         Your System                             |
|  +----------------+     +----------------+     +--------------+ |
|  |   Web App      |     |    API         |     |   Database   | |
|  |   (React)      |---->|    (Node.js)   |---->|   (Postgres) | |
|  +----------------+     +----------------+     +--------------+ |
|                               |                                 |
|                               v                                 |
|                         +----------+                            |
|                         |  Cache   |                            |
|                         | (Redis)  |                            |
|                         +----------+                            |
+----------------------------------------------------------------+

Read the full file on GitHub · 418 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 8d ago First seen · 418 lines · 91 tokens per session scan A ec2e887471de

Subscribe to this mod's changes

pact-architecture-patterns is a skill published in the GitHub repository Synaptic-Labs-AI/PACT-Plugin (71 stars, last pushed today), licensed MIT. It adds 91 tokens to every session and 2,500 once invoked, about $0.0005 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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