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 simbajigege/book2skills --skill most-important-thing-in-investing-howard-marksgit clone --depth 1 https://github.com/simbajigege/book2skillsWrote 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/simbajigege/book2skills/most-important-thing-in-investing-howard-marks)<a href="https://agentmods.dev/skills/simbajigege/book2skills/most-important-thing-in-investing-howard-marks"><img src="https://agentmods.dev/badge/skills/simbajigege/book2skills/most-important-thing-in-investing-howard-marks/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/simbajigege/book2skills/most-important-thing-in-investing-howard-marks"><img src="https://agentmods.dev/badge/skills/simbajigege/book2skills/most-important-thing-in-investing-howard-marks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00039 | $0.02235 |
| Opus 5 | $0.00019 | $0.01118 |
| Sonnet 5 | $0.00008 | $0.00447 |
| Haiku 4.5 | $0.00004 | $0.00224 |
Grade A, and why
most-important-thing-in-investing-howard-marks 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 12d 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 — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.
The Most Important Thing — Risk Investing Skill
Knowledge source: The Most Important Thing by Howard Marks.
Overview
Use this skill to evaluate investment opportunities, portfolio posture, market temperature, risk compensation, and contrarian decisions through Howard Marks's multi-factor framework. It supports investors asking whether to buy, hold, sell, wait, or become more defensive.
When to Use This Skill
Use this skill when the user asks:
- "Is this asset worth buying?"
- "What risks am I missing?"
- "Where are we in the cycle?"
- "Should I be contrarian here?"
- "Is the price attractive relative to value?"
- "How defensive should I be?"
Core Principle
There is no single most important thing. Superior investing requires second-level thinking across value, price, risk, cycles, psychology, contrarianism, patience, humility, and defense, with survival and risk control placed ahead of aggressive return seeking.
Workflow Inventory
| Workflow | User question pattern | Inputs | Steps | Output | Independent trigger? | Distinct references? | Triage score | Should be subskill? | Reason |
|---|---|---|---|---|---|---|---|---|---|
| Investment attractiveness | "Should I buy X?" | Asset, price, value estimate, risk, market context | Apply value, risk, cycles, psychology, margin | Buy/watch/avoid verdict | Yes | Yes | 4 | No | All dimensions are coupled in Marks's "no single thing" principle. |
| Risk diagnosis | "What risks?" | Position, leverage, price, assumptions | Identify permanent-loss risks and unpriced risks | Risk register | Yes | Yes | 3 | No | Same final investment report. |
| Cycle/temperature assessment | "Where are we?" | Market indicators, sentiment, valuations | Assess pendulum, psychology, risk appetite | Posture recommendation | Yes | Yes | 3 | No | Feeds buy/sell aggressiveness. |
| Contrarian opportunity | "Should I go against crowd?" | Consensus, price, fundamentals, forced selling | Test bargain source and humility | Contrarian thesis check | Yes | Yes | 3 | No | Must be combined with value and risk. |
What ships with it
9 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.
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.
- 12d ago First seen · 243 lines · 39 tokens per session scan A 2e3a3df5371e
most-important-thing-in-investing-howard-marks is a skill published in the GitHub repository simbajigege/book2skills (163 stars, last pushed 17d ago), licensed MIT. It adds 39 tokens to every session and 2,235 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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