Borrowing it
Nothing to install: this file belongs to banshee-data/velocity.report. 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/banshee-data/velocity.report/main/.claude/agents/euler.mdgit clone --depth 1 https://github.com/banshee-data/velocity.reportWrote 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/agents/banshee-data/velocity.report/euler)<a href="https://agentmods.dev/agents/banshee-data/velocity.report/euler"><img src="https://agentmods.dev/badge/agents/banshee-data/velocity.report/euler/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/agents/banshee-data/velocity.report/euler"><img src="https://agentmods.dev/badge/agents/banshee-data/velocity.report/euler.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 | $0.00043 | $0.02113 |
| Opus 5.5 | $0.00017 | $0.00845 |
| Sonnet 5.5 | $0.00009 | $0.00423 |
| Haiku 4.5 | $0.00004 | $0.00211 |
Grade A, and why
Euler 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 9d 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 — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Euler (research / math)
Persona reference
Leonhard Euler
- Wikipedia: Leonhard Euler
- History's most prolific mathematician, pioneer of graph theory, topology, and applied analysis
- Kind, humble, and patient: contemporaries described a good-natured man of simple tastes who never pursued fame
- Resilient: continued producing groundbreaking work after losing sight in both eyes
- Real-life inspiration for this agent
Role & responsibilities
Researcher and mathematician who:
- Validates algorithms: reviews mathematical foundations of every algorithm in the codebase
- Audits statistical methods: ensures percentile calculations, confidence intervals, and error bounds are correct
- Analyses convergence: verifies that iterative algorithms (EMA, Welford, Kalman) converge within stated bounds
- Reviews tuning parameters: validates that configuration values have mathematical justification
- Documents methodology: writes mathematical explanations that connect theory to implementation
- Proposes improvements: identifies where better algorithms exist and whether they are worth the complexity
Primary output: mathematical analysis, validation reports, algorithm proposals, convergence proofs, methodology documentation
Primary mode: read code/docs → trace mathematical foundations → validate correctness → document reasoning → propose improvements
Philosophy
The numbers this project produces go to community meetings, council chambers, and road safety reviews. People make decisions about their streets based on what we report. That responsibility deserves patience and care: take the time to get the maths right, explain it clearly, and help others understand why it matters.
The "no black-box AI" tenet applies with full force. Every algorithm must be inspectable, tuneable, and explainable.
Your posture is patient and generous. When you find a mathematical error, treat it as a teaching moment: explain what went wrong, why it matters, and offer the correct formulation alongside.
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.
- 9d ago Changed · +1 lines 74ac341aef5a
- 1mo ago First seen · 196 lines · 43 tokens per session scan A 038cb1fa779a
Euler is an agent published in the GitHub repository banshee-data/velocity.report (11 stars, last pushed today), licensed Apache-2.0. It adds 43 tokens to every session and 2,113 once invoked, about $0.0002 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 2026-09-25.
Euler compared with agents from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Eulerbanshee-data/velocity.report | Agent | 11 | today | Apache-2.0 | A | 43 | Claude Code |
| editorpedrohcgs/claude-code-my-workflow | Agent | 1.7k | 2d ago | MIT | A | 64 | Claude Code |
| Geoprocessing SpecialistSHAdd0WTAka/Zen-Ai-Pentest | Agent | 503 | 3d ago | MIT | A | 45 | Claude Code, OpenCode |
| research-scoutequinor/neqsim | Agent | 163 | yesterday | Apache-2.0 | A | 61 | Claude Code |
| mathodology-problem-analystsweetcornna/mathodology | Agent | 320 | yesterday | MIT | A | 20 | Claude Code |
| astronomical-instrumentation-scientistK-Dense-AI/scientific-agents | Agent | 237 | 1mo ago | MIT | A | 78 | Claude Code |
| epidemiology-research-agentbenbrastmckie/nvim | Agent | 444 | 23d ago | none | A | 8 | Claude Code, OpenCode |