thinking-in-systems

thinking-in-systems is a skill for Claude Code, Codex from marcos-sponton/frameworks-as-skills. It costs 334 tokens per session (3,751 once invoked), scanned A, original, MIT.

A way to understand how parts of a system affect one another over time. It uses ideas such as stored quantities, movement, feedback loops, delays, and recurring patterns of failure.

In plain words
What is it for?
Use it to diagnose organizational, product, environmental, or operational problems and decide where an intervention may change the system's behavior.
Why use it?
It helps explain why a problem keeps returning and identify changes that address the system's causes rather than only its visible symptoms.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to diagnose organizational, product, environmental, or operational problems and decide where an intervention may change the system's behavior.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/marcos-sponton/frameworks-as-skills/thinking-in-systems
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 marcos-sponton/frameworks-as-skills --skill thinking-in-systems
Clone the repo
git clone --depth 1 https://github.com/marcos-sponton/frameworks-as-skills

Made for: Claude Code, Codex.

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 thinking-in-systems

README.md
[![agentmods](https://agentmods.dev/badge/skills/marcos-sponton/frameworks-as-skills/thinking-in-systems/github.svg)](https://agentmods.dev/skills/marcos-sponton/frameworks-as-skills/thinking-in-systems)
Your own site
<a href="https://agentmods.dev/skills/marcos-sponton/frameworks-as-skills/thinking-in-systems"><img src="https://agentmods.dev/badge/skills/marcos-sponton/frameworks-as-skills/thinking-in-systems/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 thinking-in-systems

Your own site · 80×15
<a href="https://agentmods.dev/skills/marcos-sponton/frameworks-as-skills/thinking-in-systems"><img src="https://agentmods.dev/badge/skills/marcos-sponton/frameworks-as-skills/thinking-in-systems.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 334 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,751 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 $0.00334 $0.03751
Opus 5 $0.00167 $0.01876
Sonnet 5 $0.00067 $0.00750
Haiku 4.5 $0.00033 $0.00375

Measured 11d ago against content hash c80ef48b8431, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

thinking-in-systems 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 11d 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.

skills/thinking-in-systems/SKILL.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Thinking in Systems (Donella Meadows)

Donella "Dana" Meadows's systems thinking method — a way of seeing that helps you diagnose why systems produce the behaviors they produce and where interventions will actually work. Distilled from Thinking in Systems: A Primer (Chelsea Green, 2008 — posthumous, drafted around 1993, edited by Diana Wright), the canonical essay Leverage Points: Places to Intervene in a System (Whole Earth 1997, Sustainability Institute 1999), and the humility companion Dancing with Systems (1998/99). Meadows was a biophysicist, Dartmouth environmental studies professor, MacArthur Fellow (1994), and lead author of The Limits to Growth (1972). She died in February 2001; her work is carried today by the Academy for Systems Change (formerly the Sustainability Institute she founded in 1996), the Donella Meadows Project archive, and practitioners in her lineage.

This skill exists because "Meadows" is one of the most name-dropped and shallowly-applied names in the systems space. Most references invoke the 12 Leverage Points as a list without the ranking's diagnostic point, or invoke "systems thinking" without the archetypes or the Dancing-with-Systems humility. The skill helps the assistant identify which leverage point and which archetype apply to the situation on the table — and hold the ecological, non-corporate register Meadows's method actually inhabits.

When this skill activates

Use this skill when the user is:

  • Diagnosing why a system (organization, market, product, program, policy, ecosystem) keeps producing the same outcome despite interventions.
  • Considering an intervention and wanting to know whether it's high-leverage or low-leverage.
  • Doing a post-mortem on a program / launch / policy that didn't behave as expected.
  • Running root-cause analysis that keeps landing on symptoms rather than structure.
  • Debating between many candidate interventions and needing to rank them.
  • Reaching for an obvious fix (a target, an incentive, a threshold) for a problem that keeps recurring — a signal the fix may be at a low leverage point.
  • Trying to understand a delayed, oscillating, or overshoot-and-collapse pattern.
  • Trying to name what pattern this actually is (limits to growth, tragedy of the commons, shifting the burden, drift to low performance, success to the successful, escalation, fixes that fail).
  • Working on ecological, sustainability, resource, or planetary-limits questions — Meadows's home register.
  • Reaching for "systems thinking" language and wanting the actual method behind the phrase.

Read the full file on GitHub · 104 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. 11d ago First seen · 104 lines · 334 tokens per session scan A c80ef48b8431

Subscribe to this mod's changes

thinking-in-systems is a skill published in the GitHub repository marcos-sponton/frameworks-as-skills (1 stars, last pushed 1mo ago), licensed MIT. It adds 334 tokens to every session and 3,751 once invoked, about $0.0017 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 2026-08-31.

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