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 keli-wen/dev-skills --skill long-horizongit clone --depth 1 https://github.com/keli-wen/dev-skillsWrote 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/keli-wen/dev-skills/long-horizon)<a href="https://agentmods.dev/skills/keli-wen/dev-skills/long-horizon"><img src="https://agentmods.dev/badge/skills/keli-wen/dev-skills/long-horizon/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/keli-wen/dev-skills/long-horizon"><img src="https://agentmods.dev/badge/skills/keli-wen/dev-skills/long-horizon.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 | $0.00129 | $0.01968 |
| Opus 5 | $0.00064 | $0.00984 |
| Sonnet 5 | $0.00026 | $0.00394 |
| Haiku 4.5 | $0.00013 | $0.00197 |
Grade A, and why
long-horizon 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 11d ago First seen · 71 lines · 129 tokens per session scan A 8d4f2a4359c3
long-horizon is a skill published in the GitHub repository keli-wen/dev-skills (10 stars, last pushed 17d ago), with no licence file. It adds 129 tokens to every session and 1,968 once invoked, about $0.0006 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.
Other skills, from other repositories
maintain-splash-pages
The Lossless Group's pattern for repo-level splash pages — small Astro sites at /splash/ that ship to GitHub Pages on push to main, render the repo's changelog/ + context-v/ alongside curated marketing copy, and stay isolated from any package the repo also publishes. Use proactively whenever scaffolding a noteworthy…
changelog-conventions
How The Lossless Group writes and structures changelog/ entries across all repos (projects, true monorepos, pseudomonorepos). Use whenever shipping or pushing a coherent chunk of work, when scaffolding a new repo's changelog/ directory, when authoring a product release message, when the user says "log this", "write a…
context-vigilance
Lossless Group's framework for managing context-v/ directories in any project. Use whenever creating, updating, or organizing files in any context-v/ folder (specs, plans, prompts, blueprints, reminders, agent-skills, explorations, issues — plus the universal extra/ and sitemap/, and the experimental loops/…
crawl-fetch-ingest
The Lossless Group's workflow for filling in team and portfolio metadata for VC firms and the operating companies they back — crawl a firm's site, fetch structured data + brand assets for people and companies referenced in a deck/PDF, ingest as canonical .md files with YAML frontmatter. Supports two starting anchors …
lossless-crm-interface-guidelines
Conventions for reading and writing the operator's Twenty CRM instances (Lossless, Palmer AI, The Water Foundation) via MCP. Use whenever adding or enriching a company, person, deal, thesis, event, or portfolio relationship; when triaging a list or export into the CRM; or when extending the CRM schema. Encodes…
open-graph-share-seo-geo
How to make a page unfurl reliably in iMessage, WhatsApp, Slack, Discord, LinkedIn, and X; surface to search engines via sitemap.xml + robots.txt; and stay legible to generative engines (GEO), including the llms.txt standard for LLM corpus ingest. Use when adding or debugging OpenGraph / Twitter Card metadata, picking…