CodexHost is a desktop application that lets users run coding-agent harnesses such as Pi and Claude Code inside Codex Desktop. It is for people who want to choose among multiple agents and have them delegate tasks to one another while staying in one workspace.
Borrowing it
Nothing to install: this file belongs to BytePioneer-AI/codex-host. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/BytePioneer-AI/codex-host/main/.agents/skills/openspec-update-change/SKILL.mdgit clone --depth 1 https://github.com/BytePioneer-AI/codex-hostWrote 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/bytepioneer-ai/codex-host/openspec-update-change)<a href="https://agentmods.dev/skills/bytepioneer-ai/codex-host/openspec-update-change"><img src="https://agentmods.dev/badge/skills/bytepioneer-ai/codex-host/openspec-update-change/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/bytepioneer-ai/codex-host/openspec-update-change"><img src="https://agentmods.dev/badge/skills/bytepioneer-ai/codex-host/openspec-update-change.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 | $0.00095 | $0.02548 |
| Opus 5.5 | $0.00038 | $0.01019 |
| Sonnet 5.5 | $0.00019 | $0.00510 |
| Haiku 4.5 | $0.00010 | $0.00255 |
Grade A, and why
openspec-update-change 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 13d 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 LGPL-3.0
The repository is licensed LGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 13d ago First seen · 110 lines · 95 tokens per session scan A 3c91b62e9574
openspec-update-change is a skill published in the GitHub repository BytePioneer-AI/codex-host (2,982 stars, last pushed yesterday), licensed LGPL-3.0. It adds 95 tokens to every session and 2,548 once invoked, about $0.0004 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 2026-10-14.
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