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 hamzabellouch/agent-skills --skill fourier-series-transformsgit clone --depth 1 https://github.com/hamzabellouch/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/hamzabellouch/agent-skills/fourier-series-transforms)<a href="https://agentmods.dev/skills/hamzabellouch/agent-skills/fourier-series-transforms"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/fourier-series-transforms/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/hamzabellouch/agent-skills/fourier-series-transforms"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/fourier-series-transforms.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 | $0.00034 | $0.00319 |
| Opus 5.5 | $0.00014 | $0.00128 |
| Sonnet 5.5 | $0.00007 | $0.00064 |
| Haiku 4.5 | $0.00003 | $0.00032 |
Grade A, and why
fourier-series-transforms 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 7d 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.
What it actually says
Fourier Series and Transforms
ID: math.fourier_analysis
Domain: Mathematics → Analysis
Difficulty: 3/5
Prerequisites
- math.calculus.integrals
Core Concepts
- Fourier series
- Fourier transform
- convolution
- Parseval's theorem
- Dirac delta
Key Equations
$$ f(x) = \sum_n c_n e^{inx} $$ $$ \hat f(k) = \int f(x)e^{-ikx}dx $$ $$ \int |f|^2 dx = \int |\hat f|^2 dk\ \text{(Plancherel)} $$
Methods
- Compute coefficients/transform
- Apply convolution theorem
- Use Parseval for energy integrals
Typical Problem Types
- Signal analysis
- Diffraction theory
- Quantum momentum-space wavefunctions
Common Pitfalls
- Forgetting 2π factors
- Assuming pointwise convergence without conditions
Related Skills
- optics.modern.fourier_optics
- qm.schrodinger.wavefunction
References
- Bracewell Fourier Transform
- Arfken Ch.15
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.
- 7d ago First seen · 59 lines · 34 tokens per session scan A f63f667ba593
fourier-series-transforms is a skill published in the GitHub repository hamzabellouch/agent-skills (8 stars, last pushed today), licensed MIT. It adds 34 tokens to every session and 319 once invoked, about $0.0001 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 2026-10-10.
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