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 agentmods add skills/treylom/thiscodex/promptnpx skills add treylom/ThisCodex --skill promptgit clone --depth 1 https://github.com/treylom/ThisCodexWrote 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/treylom/thiscodex/prompt)<a href="https://agentmods.dev/skills/treylom/thiscodex/prompt"><img src="https://agentmods.dev/badge/skills/treylom/thiscodex/prompt.svg" alt="Measured on agentmods" 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 | $0.00084 | $0.01049 |
| Opus 5 | $0.00042 | $0.00524 |
| Sonnet 5 | $0.00017 | $0.00210 |
| Haiku 4.5 | $0.00008 | $0.00105 |
Grade A, and why
prompt 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 6d 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 — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.
prompt — structured prompt generation
Vendored, unmodified-in-substance copy of the public prompt-engineering-skills
package (MIT). It turns a rough intent into a structured, framework-grounded
prompt rather than an ad-hoc one, and routes by task type.
When to use (mandatory-invocation)
Invoke this skill — do not free-hand a prompt — whenever the work is:
- "write / make / improve / review a prompt" for any model
- building GPTs or Gems system instructions
- fact-check / research prompting (IFCN-grounded base templates required)
- image-generation prompting (5-stage framework)
- any request whose deliverable is itself a prompt
A bot whose config mandates /prompt (see the repo's
docs/SETUP-CONFIG-GUIDE.md §"force-invoke") MUST route here first.
How it routes (progressive disclosure)
This SKILL.md is the router. Load the heavy reference only for the matched
task — do not read all of it up front:
See references/ for detailed procedures only when the matched prompt task asks for them.
| Task | Load |
|---|---|
| Generate / refine a prompt (main workflow) | references/prompt-generator.md |
| Framework / technique deep reference | references/prompt-engineering-guide.md |
| Worked examples (Claude / GPT / image) | references/examples/ |
| Build a GPTs instruction | references/instructions/GPTs-Prompt-Generator.md |
| Build a Gems instruction | references/instructions/Gems-Prompt-Generator.md |
| Build Codex bot meta file (canonical AGENTS.md + SOUL v2 capsule) | references/instructions/Bot-Persona-Generator.md |
Procedure:
- Classify the request (generate / fact-check / research / image / GPTs / Gems).
- Read only the matched reference above.
- For fact-check / research, the engineering guide's IFCN base template is mandatory — do not emit a generic XML prompt.
- Produce the structured prompt; show the user the final prompt explicitly.
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.
- LICENSE 2.0 KB
- references/examples/claude-4.5-examples.md 5.3 KB
- references/examples/gpt-5.4-examples.md 4.6 KB
- references/examples/image-generation-examples.md 7.7 KB
- references/instructions/Bot-Persona-Generator.md 4.2 KB
- references/instructions/Gems-Prompt-Generator.md 44 KB
- references/instructions/GPTs-Prompt-Generator.md 12 KB
- references/prompt-engineering-guide.md 252 KB
- references/prompt-generator.md 90 KB
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.
- 6d ago First seen · 72 lines · 84 tokens per session scan A d7f965f50fdd
prompt is a skill published in the GitHub repository treylom/ThisCodex (18 stars, last pushed yesterday), licensed MIT. It adds 84 tokens to every session and 1,049 once invoked, about $0.0004 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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