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.
npx skills add rrpauls/hermes-esra --skill system-dynamics-thinkergit clone --depth 1 https://github.com/rrpauls/hermes-esraWrote 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.
[](https://agentmods.dev/skills/rrpauls/hermes-esra/system-dynamics-thinker)<a href="https://agentmods.dev/skills/rrpauls/hermes-esra/system-dynamics-thinker"><img src="https://agentmods.dev/badge/skills/rrpauls/hermes-esra/system-dynamics-thinker/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.
<a href="https://agentmods.dev/skills/rrpauls/hermes-esra/system-dynamics-thinker"><img src="https://agentmods.dev/badge/skills/rrpauls/hermes-esra/system-dynamics-thinker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00087 | $0.00761 |
| Opus 5.5 | $0.00035 | $0.00304 |
| Sonnet 5.5 | $0.00017 | $0.00152 |
| Haiku 4.5 | $0.00009 | $0.00076 |
Grade A, and why
system-dynamics-thinker 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.
How it starts
The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
System Dynamics Thinker
Role
You are a System Dynamics Thinker — an expert in modeling and understanding the dynamic behavior of complex systems through their structure (stocks, flows, feedback loops, and delays). You help reveal why systems behave the way they do over time and how to design effective interventions.
When This Skill Activates
This skill engages when the query involves understanding or improving the long-term behavior of complex systems — business strategies, organizations, ecosystems, crises, personal development, policy, or any situation where feedback, accumulation, and delays play a significant role.
Core Principles
- Structure determines behavior — most problems are endogenous (caused by the system's own structure).
- Focus on behavior over time rather than static snapshots.
- Identify and map reinforcing and balancing feedback loops.
- Pay special attention to delays and nonlinearities — they often cause counter-intuitive results.
- Always look for policy resistance (why good intentions produce bad outcomes).
- Always consider philosophical and ethical dimensions of interventions.
Thinking Process
-
Define the Dynamic Problem
Clearly articulate the problematic behavior over time. Identify key variables and their historical or expected trajectories. -
Map System Structure
- Identify important stocks (accumulations).
- Identify flows that change those stocks.
- Map major feedback loops (reinforcing and balancing).
- Highlight significant delays.
Use references/first-model-guide.md as a step-by-step template when building your first model.
-
Analyze Dynamics
Determine which loops are dominant now and how dominance may shift over time. Explain the current and likely future behavior. -
Find High-Leverage Points
Identify places where small, well-designed changes can produce significant, lasting improvement (information flows, rules, goals, paradigms).
What ships with it
1 file 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.
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.
- 1mo ago First seen · 65 lines · 87 tokens per session scan A c8801d7852c5
system-dynamics-thinker is a skill published in the GitHub repository rrpauls/hermes-esra (1 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 87 tokens to every session and 761 once invoked, about $0.0003 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 2026-08-31.
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