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 mikecann/agent-skills --skill mike-convex-thumbnailgit clone --depth 1 https://github.com/mikecann/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/mikecann/agent-skills/mike-convex-thumbnail)<a href="https://agentmods.dev/skills/mikecann/agent-skills/mike-convex-thumbnail"><img src="https://agentmods.dev/badge/skills/mikecann/agent-skills/mike-convex-thumbnail/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/mikecann/agent-skills/mike-convex-thumbnail"><img src="https://agentmods.dev/badge/skills/mikecann/agent-skills/mike-convex-thumbnail.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 | $0.00073 | $0.01403 |
| Opus 5 | $0.00036 | $0.00701 |
| Sonnet 5 | $0.00015 | $0.00281 |
| Haiku 4.5 | $0.00007 | $0.00140 |
Grade A, and why
mike-convex-thumbnail 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.
How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mike Convex Thumbnail
Create polished YouTube thumbnails for Mike's Convex/dev videos using the image model, Mike's local cutout photos, and local Convex brand assets.
When to Use
- Creating YouTube thumbnail options for a Convex or developer video.
- Reworking the Convex static hosting "NO DASHBOARDS" thumbnail.
- Making a thumbnail that must include Mike's recognizable head-and-shoulders portrait.
- Replacing an incorrect generated mark with the real Convex logo or symbol.
When Not to Use
- Generic thumbnail advice with no image generation requested.
- Non-Convex videos unless Mike explicitly wants the same personal thumbnail style.
- Deterministic compositing in code, unless Mike explicitly asks for a manual layout. The manual collage route looked bad for this style.
Core Workflow
- Inspect the available local references before prompting the image model:
- Run
bash scripts/check-local-assets.shfrom this skill. It discovers the Google Drive account folder and prints absolute paths for the photo and brand assets. - Use
view_imageon at least one Mike headshot and the Convex symbol before calling the image model.
- Run
- If the user provided a script, Notion page, or video brief, extract the main hook first. Keep the thumbnail concept simple enough to read at feed size.
- Use the image model for the thumbnail. Do not build the main image by manually pasting cutouts and cards together unless the user asks for that.
- Keep text short. Prefer one strong phrase such as
NO DASHBOARDS,HOST ON CONVEX,STATIC APP LIVE, orSKIP HOSTING. - Prompt for Mike as a large recognizable head-and-shoulders portrait, not a full-body figure.
- Prompt the Convex logo as a brand reference. If a generated logo is wrong, explicitly say to replace any cube or hexagon mark with the official Convex swirl symbol.
- Return 3 to 5 visually distinct options when brainstorming. If Mike points at one option, iterate that option instead of restarting the set.
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.
- 11d ago First seen · 135 lines · 73 tokens per session scan A e003a0b8d538
mike-convex-thumbnail is a skill published in the GitHub repository mikecann/agent-skills (21 stars, last pushed 1mo ago), licensed MIT. It adds 73 tokens to every session and 1,403 once invoked, about $0.0004 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 2026-08-30.
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