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 shir-bruchim/agent-runtime-kit --skill extend-agentgit clone --depth 1 https://github.com/shir-bruchim/agent-runtime-kitWrote 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/shir-bruchim/agent-runtime-kit/extend-agent)<a href="https://agentmods.dev/skills/shir-bruchim/agent-runtime-kit/extend-agent"><img src="https://agentmods.dev/badge/skills/shir-bruchim/agent-runtime-kit/extend-agent/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/shir-bruchim/agent-runtime-kit/extend-agent"><img src="https://agentmods.dev/badge/skills/shir-bruchim/agent-runtime-kit/extend-agent.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 | $0.00025 | $0.04212 |
| Opus 5.5 | $0.00010 | $0.01685 |
| Sonnet 5.5 | $0.00005 | $0.00842 |
| Haiku 4.5 | $0.00003 | $0.00421 |
Grade D, and why
extend-agent scanned grade D with 3 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 2mo 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
- **Dynamic-context injection (`` !`cmd` ``) runs under the invocation's working-directory sandbox.** Direct reads of files outside the current project (`grep ~/.claude/settings.json`, `cat ~/.claude/some-file`) are BLOC Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
- **Dynamic-context injection (`` !`cmd` ``) runs under the invocation's working-directory sandbox.** Direct reads of files outside the current project (`grep ~/.claude/settings.json`, `cat ~/.claude/some-file`) are BLOC Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
NEVER run: rm -rf, git push --force, DROP TABLE. 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 ships with it
7 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.
- 2mo ago First seen · 377 lines · 25 tokens per session scan D bb5928cce46b
extend-agent is a skill published in the GitHub repository shir-bruchim/agent-runtime-kit (8 stars, last pushed 2mo ago), with no licence file. It adds 25 tokens to every session and 4,212 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it D with 3 findings (reads agent configuration directories, enumerates other installed skills, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
extend-agent compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| extend-agentshir-bruchim/agent-runtime-kit | Skill | 8 | 2mo ago | none | D | 25 | Claude Code, Codex |
| imagegenopenai/codex | Skill | 133k | yesterday | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 99k | yesterday | Apache-2.0 | A | 19 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 313k | 3d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | yesterday | MIT | A | 95 | Claude Code |
| next-partial-prefetching-adoptionvercel/next.js | Skill | 143k | yesterday | MIT | A | 103 | Claude Code |