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 agentmods add commands/crisng95/flowkit/fk-thumbnail-guidegit clone --depth 1 https://github.com/crisng95/flowkitWhat 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 | $0.00000 | $0.01030 |
| Opus 5 | $0.00000 | $0.00515 |
| Sonnet 5 | $0.00000 | $0.00206 |
| Haiku 4.5 | $0.00000 | $0.00103 |
Grade A, and why
fk-thumbnail-guide 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 2d 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 — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YouTube Thumbnail Guide — Hook-Worthy Design Rules
Required Elements
| Element | Rule |
|---|---|
| Text | 0-3 words max. Bold thick sans-serif. Yellow/white on dark. Upper half only. Never bottom-right (YouTube overlays duration there) |
| Face | 30-50% of frame. Extreme emotion: shock, anger, fear, determination. Direct eye contact. Never neutral/calm |
| Colors | Red + Blue, Yellow + Purple, Orange + Teal. High saturation. No pastels, no gray, no muted tones |
| Composition | ONE focal point. Subject 40-60% of frame. Blurred/simple background. Rule of thirds |
| Lighting | Dramatic — rim light, golden hour, high-contrast shadows. Never flat/even |
6 Thumbnail Formulas
Formula 1: Reaction Face (Best for drama/reveals)
- Tight face crop 40-50% of frame, extreme emotion
- 1-3 power words upper corner
- Subject reacting to something partially visible
- Prompt pattern:
Extreme close-up of [CHARACTER] face, [EMOTION], [BACKGROUND ELEMENT partially visible], bold vivid colors, dramatic rim lighting
Formula 2: Before/After (Best for transformations)
- Split screen: state A left, state B right
- Clear dividing line
- Prompt pattern:
Split composition, left side shows [STATE A], right side shows [STATE B], dramatic contrast
Formula 3: Contrast/Clash (Best for military/underdog)
- Two visually incompatible things: massive vs small, hero vs overwhelming enemy
- High visual tension
- Prompt pattern:
[SMALL HERO] facing [MASSIVE THREAT], extreme scale contrast, cinematic wide angle
Formula 4: Mystery/Reveal (Best for secrets/twists)
- Key element partially hidden or out of frame
- Text: "?", "Nobody expected..."
- Prompt pattern:
[SUBJECT] looking at something dramatic off-screen, [EMOTION], mysterious lighting, partial reveal
Formula 5: Stakes Frame (Best for military/survival)
- Single character against impossible odds
- Environment communicates extreme pressure
- Prompt pattern:
[CHARACTER] surrounded/outnumbered by [THREAT], tension, dramatic environment showing scale of danger
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.
- 2d ago First seen · 86 lines · 0 tokens per session scan A 1658f9359659
fk-thumbnail-guide is a command published in the GitHub repository crisng95/flowkit (620 stars, last pushed 14d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,030 tokens. 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.
Other commands, from other repositories
checklist
Generate a custom checklist for the current feature based on user requirements.
clarify
Identify underspecified areas in the current feature spec by asking up to 5 highly targeted clarification questions and encoding answers back into the spec.
specify
Create or update the feature specification from a natural language feature description.
analyze
Perform a non-destructive cross-artifact consistency and quality analysis across spec.md, plan.md, and tasks.md after task generation.
constitution
Create or update the project constitution from interactive or provided principle inputs.
converge
Assess the current codebase against the feature's spec, plan, and tasks, then append any remaining unbuilt work as new tasks to tasks.md so implement can complete it.