# Mental Models > Apply mental models — your own, or 21 sourced ones — to any problem. Use when user requests decision analysis, says "help me think", "apply mental model", mentions model names (inversion, bottlenecks, second-order thinking), or needs structured thinking frameworks. - Skill: `cyperx84/mental-models` (Agent Skill, multi-file: 24 files) - Install (CLI): `npx skillmds@latest add cyperx84/mental-models` - Raw SKILL.md: https://api.skillmd.com/api/skills/cyperx84/mental-models/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: cyperx84 (https://skillmd.com/u/cyperx84) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/cyperx84/mental-models --- # Mental Models Apply cognitive frameworks from several disciplines — systems, economics, psychology, mathematics, strategy — to analyse problems, make decisions, and think more clearly. Everything this skill needs is a file. No install, no dependencies, no tooling — you read markdown. ## When to Activate - User names a specific model ("apply inversion", "use bottlenecks") - User asks "help me think through X" or "what model fits X" - User requests decision analysis, trade-off evaluation, or structured reasoning - User describes a complex/ambiguous problem and wants a framework ## Step 1 — Load the index Read [`models/index.md`](./models/index.md). It lists every bundled model with a one-line description. It is short; load it in full. Then check for the user's own models. The bundled set is a starting point, not a fixed list: | Path | Holds | |---|---| | `.mental-models/` (relative to the working directory) | this project's or team's models, committed with the code | | `~/.claude/mental-models/` | the user's personal models, available everywhere | **Always run both globs before selecting. Do not assume they are empty** — one tool call settles it, and a model the user wrote for exactly this situation is the most valuable thing you can find. This matters most when the problem is urgent: urgency is precisely when a team's own hard-won model is worth more than a general one, and precisely when you are tempted to skip the check. If either has files, read each one's YAML frontmatter (`title`, `description`, `tags`) to learn what is there. A directory may have its own `index.md`; read that instead if present. If both are empty, carry on with the bundled models. **A user model always wins a name collision with a bundled one.** If someone wrote their own `inversion.md`, they meant it — use theirs, and don't mention the built-in unless asked. Treat user models as first-class. A model a team wrote about their own domain usually beats a general one at that domain. ## Step 2 — YOU select the models Read the user's problem and pick **2–4 models from different areas**. Selection is a reasoning task and you are better at it than any keyword matcher: cross-area coverage is the entire point of a *latticework* — a single-area pick means blind spots go unchecked. **Discovery heuristics** to bias your reading of the index: - **Risk / uncertainty / reversibility** → inversion, margin of safety, randomness - **Stuck / can't see options** → first-principles thinking, second-order thinking, framing - **Conflict / negotiation / competition** → bias from incentives, asymmetric warfare, trade-offs - **Complex system / unintended effects** → feedback loops, emergence, bottlenecks, leverage - **Performance / optimization** → bottlenecks, leverage, activation energy - **People / team / behaviour** → bias from incentives, social proof, confirmation bias - **Evaluating evidence or results** → sampling, regression to the mean, randomness - **Change that won't start, or won't stop** → activation energy, inertia ## Step 3 — Retrieve each pick Read the file directly. Bundled models are flat files named by slug: ``` models/.md ``` e.g. `models/inversion.md`. The index gives you the exact filename — use it rather than guessing. User models are at the path you found them. ## Step 4 — Apply Each model file has YAML frontmatter and four parts: - the **description prose** — what the idea is and where it comes from, with `[^footnotes]` pointing at entries in the frontmatter's `sources` - **When to Avoid** — read this *before* concluding, and surface it if it applies. It is what separates a mental model from a slogan. - **Thinking Steps** — walk these against the user's actual facts. Follow them; don't paraphrase the framework away. - **Coaching Questions** — ask these to deepen the analysis where useful. Show where the chosen models agree, and where they disagree. ## Step 5 — Report - Name which models you used and why you picked them - Where models disagreed, say so explicitly rather than silently picking a winner - End with 3–5 concrete, actionable next steps - Name any "when to avoid" conditions that apply to this case - If a source matters to the point you are making, cite it — the `sources` block has the link ## Core Guidelines 1. **2–4 models per analysis, from different areas** — coverage over quantity 2. **Follow the Thinking Steps verbatim** — don't paraphrase the framework away 3. **Always check When to Avoid** — warn the user if the model misfits 4. **Latticework**: show how chosen models connect and where they disagree 5. **Be actionable**: end with concrete next steps, not theory 6. **Name biases honestly**: if the user seems caught in one, surface it ## The format `models/` is an [Open Knowledge Format](https://github.com/GoogleCloudPlatform/open-knowledge-format) bundle: a directory of markdown files, each with YAML frontmatter carrying at minimum a `type`. That means any OKF bundle can be dropped into `.mental-models/` and read the same way, and this bundle can be consumed by any OKF-aware agent. Obsidian vaults work too — treat `[[wikilink]]` as a link to `wikilink.md`. To write your own, copy [`TEMPLATE.md`](./TEMPLATE.md). ## Files in This Skill - `SKILL.md` — this entry point - `TEMPLATE.md` — the format; copy it to write your own model - `models/` — the bundled OKF bundle: `index.md` plus one file per model Outside this skill, and never overwritten by an update: - `.mental-models/*.md` — the working directory's own models - `~/.claude/mental-models/*.md` — the user's personal models Source: