dimension-propagator

dimension-propagator is an agent for coding agents from trailofbits/skills. It costs 22 tokens per session (2,374 once invoked), scanned A, original, CC-BY-SA-4.0.

A software agent that carries units or dimensions through mathematical calculations and chains of function calls. It reports where those units do not match.

In plain words
What is it for?
Use it to check dimensional annotations across arithmetic and calls between functions.
Why use it?
It helps find mistakes such as combining values measured in incompatible units during calculations.

Agent

Part of the dimensional-analysis plugin — 1 skill, 5 agents shipped together

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 agents/trailofbits/skills/dimension-propagator
Clone the repo
git clone --depth 1 https://github.com/trailofbits/skills

Or install dimensional-analysis, the plugin that ships this one along with the rest of its 1 skill, 5 agents.

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 dimension-propagator

README.md
[![agentmods](https://agentmods.dev/badge/agents/trailofbits/skills/dimension-propagator.svg)](https://agentmods.dev/agents/trailofbits/skills/dimension-propagator)
Your own site
<a href="https://agentmods.dev/agents/trailofbits/skills/dimension-propagator"><img src="https://agentmods.dev/badge/agents/trailofbits/skills/dimension-propagator.svg" alt="Measured on agentmods" height="20"></a>
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,374 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00022 $0.02374
Opus 5 $0.00011 $0.01187
Sonnet 5 $0.00004 $0.00475
Haiku 4.5 $0.00002 $0.00237

Measured 3d ago against content hash 2fd4e15af2b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dimension-propagator 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 3d 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.

plugins/dimensional-analysis/agents/dimension-propagator.md · 219 lines

The source is not reproduced here

Licensed CC-BY-SA-4.0

The repository is licensed CC-BY-SA-4.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 3d ago First seen · 219 lines · 22 tokens per session scan A 2fd4e15af2b6

Subscribe to this mod's changes

dimension-propagator is an agent published in the GitHub repository trailofbits/skills (6,952 stars, last pushed today), licensed CC-BY-SA-4.0. It adds 22 tokens to every session and 2,374 once invoked, about $0.0001 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.