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 leventilo/mobius --skill physics-interpretergit clone --depth 1 https://github.com/leventilo/mobiusWrote 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/leventilo/mobius/physics-interpreter)<a href="https://agentmods.dev/skills/leventilo/mobius/physics-interpreter"><img src="https://agentmods.dev/badge/skills/leventilo/mobius/physics-interpreter/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/leventilo/mobius/physics-interpreter"><img src="https://agentmods.dev/badge/skills/leventilo/mobius/physics-interpreter.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 | $0.00057 | $0.05494 |
| Opus 5.5 | $0.00023 | $0.02198 |
| Sonnet 5.5 | $0.00011 | $0.01099 |
| Haiku 4.5 | $0.00006 | $0.00549 |
Grade A, and why
physics-interpreter 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 2mo 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 — 290 lines — stays where its author put it; the contents beside it link to each section on GitHub.
physics-interpreter
Purpose and scope
This skill produces exactly one artifact: the physics sub-tree of the SimSpec, defined at $defs.physics of simspec.schema.json. That sub-tree fixes what every downstream skill is allowed to assume about the paper: which equations govern the system, on which domain they live, with which boundary and initial conditions, with which constants, in which regime, and under which named approximations. Mobius's "same paper, same simulator, ten times in a row" property begins here. If the regime is wrong, every solver heuristic in simspec-author Rule 3-6 fires the wrong way and the rest of the pipeline silently builds the wrong simulator.
What this skill does NOT do. It does not extract equations from the PDF — that is paper-parser's job, and its equations[] array is an input here, not an output. It does not extract numerical claims from figures or text — that is claim-extractor. It does not compose the full SimSpec — that is simspec-author. It does not generate Python solver code — that is primitive-generator. It does not write Three.js or Canvas templates — that is viz-mapper. It does not run units, CFL, or conservation checks — those are the five bundled scripts of science-integrity. The physics-interpreter is a typed-translate skill: paper-parser artifacts in, validated physics sub-tree out, every interpretive choice logged.
Inputs
The skill expects three artifacts on disk in the current working directory.
paper.json from paper-parser carries the full paper provenance and a list equations[]. Each equation has at minimum a latex field (LaTeX source as it appears in the PDF), a tentative sympy field (parser's best-effort sympy translation, may be empty), a free-text surrounding_context excerpt (~200 chars before and after), and an optional variables dict that paper-parser populated from the equation's typesetting context (e.g. greek-symbol heuristics, definition-by-text "where E is the electric field"). The figures[] and numerical_claims[] arrays are read for cross-references.
What ships with it
8 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.
- 2mo ago First seen · 290 lines · 57 tokens per session scan A 179ffa04a38f
physics-interpreter is a skill published in the GitHub repository leventilo/mobius (8 stars, last pushed 6mo ago), licensed MIT. It adds 57 tokens to every session and 5,494 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 2026-08-31.
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