tv-eval

tv-eval is a skill for Claude Code, Codex from specula-org/SysMoBench. It costs 69 tokens per session (190 once invoked), scanned A, original, Apache-2.0.

A method for testing how closely a TLA+ specification models a real system. TLA+ is a language for describing and checking how systems behave over time.

In plain words
What is it for?
For instrumenting a real system, comparing its behavior with a TLA+ model, running TLC model checks, and interpreting transition-validation scores.
Why use it?
It produces action-by-action pass rates with explanations, making the accuracy of an AI-generated specification easier to assess.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/specula-org/sysmobench/tv-eval
Any agent
npx skills add specula-org/SysMoBench --skill tv-eval
Clone the repo
git clone --depth 1 https://github.com/specula-org/SysMoBench

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for tv-eval

README.md
[![agentmods](https://agentmods.dev/badge/skills/specula-org/sysmobench/tv-eval.svg)](https://agentmods.dev/skills/specula-org/sysmobench/tv-eval)
Your own site
<a href="https://agentmods.dev/skills/specula-org/sysmobench/tv-eval"><img src="https://agentmods.dev/badge/skills/specula-org/sysmobench/tv-eval.svg" alt="Measured on agentmods" height="20"></a>
Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 190 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00069 $0.00190
Opus 5 $0.00034 $0.00095
Sonnet 5 $0.00014 $0.00038
Haiku 4.5 $0.00007 $0.00019

Measured 4d ago against content hash fc3515f72cbc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tv-eval 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 4d ago.

The scan reads SKILL.md. This mod also ships 7 executable files (examples/etcd/ai_spec_1/make_windows.py, examples/etcd/ai_spec_1/run_tv.py, examples/etcd/ai_spec_2/make_windows.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

tla_eval/skills/tv-eval/SKILL.md · 16 lines

What it actually says

Read guide.md for the full workflow.

Reference docs:

  • references/canonical_window_format.md — the one true window file schema
  • references/tv_module_template.md — how to write TV_.tla
  • references/score_interpretation.md — how to explain pass rates

Worked examples:

  • examples/spin/ — simple case (spinlock), 1 aux variable
  • examples/etcd/ — complex case (etcd-raft), 4 aux variables, log abstraction
Files

What ships with it

46 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.

Changes

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.

  1. 4d ago First seen · 16 lines · 69 tokens per session scan A fc3515f72cbc

Subscribe to this mod's changes

tv-eval is a skill published in the GitHub repository specula-org/SysMoBench (24 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 69 tokens to every session and 190 once invoked, about $0.0003 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.

Related

Other skills, from other repositories

exploratory-data-analysis

Perform bounded, local exploratory analysis of explicitly supported scientific files. Use for redacted CSV/TSV/JSON profiles; optional NumPy, HDF5, FASTA/FASTQ, and basic image metadata inspection; missingness/leakage audits; outlier and transformation sensitivity; and rigorous EDA report scaffolds. Other domain…

K-Dense-AI/scientific-agent-skills · 83 tokens

nature-statistics

Audit, revise, or draft manuscript statistical reporting for Nature / high-impact journal submissions. Use when the user asks to check statistical analysis sections, p values, confidence intervals, sample size, biological versus technical replicates, randomization, blinding, multiple-comparison correction, model…

Yuan1z0825/nature-skills · 139 tokens

evaluating-with-leakage-gates

Evaluate an OpenMed de-identification or clinical NER model against the leakage-first release gates G1a through G8, which gate releases on residual PHI leakage rather than on F1. Use when the user wants to run the OpenMed eval harness on a synthetic golden set, decide whether a de-id model is RELEASABLE or…

maziyarpanahi/openmed · 158 tokens

mapping-to-snomed

Maps clinical concept spans extracted by OpenMed to SNOMED CT concepts through a USER-SUPPLIED terminology server (the user's own Ontoserver, Snowstorm, or UMLS/UTS), never a bundled vocabulary. Use when the user wants to code findings, disorders, procedures, body structures, or substances to SNOMED CT, run an ECL…

maziyarpanahi/openmed · 205 tokens

mixed-precision

Use FP16/BF16 mixed precision to accelerate training and reduce memory. Use when optimizing GPU performance.

aiming-lab/AutoResearchClaw · 25 tokens

indication-dossier

Build a source-backed biomedical indication dossier. Use when a research task asks for disease biology, target rationale, patient segmentation, biomarkers, trials, drugs, competitive landscape, or translational evidence.

companion-inc/feynman · 43 tokens