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 dceoy/ai-coding-agent-skills --skill x-timelinegit clone --depth 1 https://github.com/dceoy/ai-coding-agent-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/dceoy/ai-coding-agent-skills/x-timeline)<a href="https://agentmods.dev/skills/dceoy/ai-coding-agent-skills/x-timeline"><img src="https://agentmods.dev/badge/skills/dceoy/ai-coding-agent-skills/x-timeline/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/dceoy/ai-coding-agent-skills/x-timeline"><img src="https://agentmods.dev/badge/skills/dceoy/ai-coding-agent-skills/x-timeline.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 | $0.00051 | $0.03801 |
| Opus 5.5 | $0.00020 | $0.01520 |
| Sonnet 5.5 | $0.00010 | $0.00760 |
| Haiku 4.5 | $0.00005 | $0.00380 |
Grade A, and why
x-timeline 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 3d 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
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
3 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.
- 3d ago Changed · +29 tokens per session 1b793251eec9
- 1mo ago Changed · +78 lines 281d2ffa46eb
- 2mo ago Changed · -242 lines scan B → A 50505a73c704
- 2mo ago First seen · 477 lines · 22 tokens per session scan B 4f11fe8459b1
x-timeline is a skill published in the GitHub repository dceoy/ai-coding-agent-skills (4 stars, last pushed today), licensed AGPL-3.0. It adds 51 tokens to every session and 3,801 once invoked, about $0.0002 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.
x-timeline compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| x-timelinedceoy/ai-coding-agent-skills | Skill | 4 | today | AGPL-3.0 | A | 51 | Claude Code |
| fetch-url-as-markdownCodeAlive-AI/ai-driven-development | Skill | 167 | yesterday | MIT | A | 90 | Claude Code |
| browser-qahashgraph-online/awesome-codex-plugins | Skill | 1.5k | yesterday | Apache-2.0 | A | 58 | Claude Code, Codex |
| record-and-replayilysenko/codex-desktop-linux | Skill | 3.9k | yesterday | MIT | A | 38 | Claude Code, Codex |
| chrome-extensionericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 76 | Claude Code, Codex |
| data-scraperericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 77 | Claude Code, Codex |
| memstack-development-webapp-testingcwinvestments/memstack | Skill | 429 | 13d ago | MIT | A | 75 | Claude Code |