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 PostHog/ai-plugin --skill building-canvasesgit clone --depth 1 https://github.com/PostHog/ai-pluginWrote 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/posthog/ai-plugin/building-canvases)<a href="https://agentmods.dev/skills/posthog/ai-plugin/building-canvases"><img src="https://agentmods.dev/badge/skills/posthog/ai-plugin/building-canvases/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/posthog/ai-plugin/building-canvases"><img src="https://agentmods.dev/badge/skills/posthog/ai-plugin/building-canvases.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 | $0.00148 | $0.03999 |
| Opus 5.5 | $0.00059 | $0.01600 |
| Sonnet 5.5 | $0.00030 | $0.00800 |
| Haiku 4.5 | $0.00015 | $0.00400 |
Grade A, and why
building-canvases 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 yesterday.
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 ships with it
1 file 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.
- yesterday Changed · +5 lines 7456bddf5d33
- 11d ago Changed · +15 lines 39619d500d37
- 22d ago Changed · +1 lines a33fd876262d
- 1mo ago Changed · +47 lines 0a6d52c1aa65
- 1mo ago Changed · +2 lines 2b07b4ef56a8
- 1mo ago First seen · 177 lines · 148 tokens per session scan A eb7a2a26c3c8
building-canvases is a skill published in the GitHub repository PostHog/ai-plugin (96 stars, last pushed yesterday), with no licence file. It adds 148 tokens to every session and 3,999 once invoked, about $0.0006 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 2026-09-05.
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