diffuse

A skill that maps how a proposed code, configuration, dependency, or database change could affect the rest of a system. It traces direct and indirect effects through several independent analyses.

In plain words
What is it for?
Use it with a diff, file, directory, branch, or change description to identify first-, second-, and third-order impacts.
Why use it?
It helps reveal consequences outside the files or component being changed before implementation begins.

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/sjarmak/agent-workflows/diffuse
Any agent
npx skills add sjarmak/agent-workflows --skill diffuse
Clone the repo
git clone --depth 1 https://github.com/sjarmak/agent-workflows

Made for: Claude Code, Codex.

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,669 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 $0.00000 $0.02669
Opus 5 $0.00000 $0.01334
Sonnet 5 $0.00000 $0.00534
Haiku 4.5 $0.00000 $0.00267

Measured yesterday against content hash 282fc2fca944, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

diffuse 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 yesterday.

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.

skills/diffuse/SKILL.md · 223 lines

How it starts

The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Blast Radius Impact Mapping. Takes a proposed change (diff, migration, dependency upgrade, config change) and spawns N independent agents, each tracing impact through a different propagation path. No agent sees others' findings. Synthesizes into a combined blast radius map showing first-order, second-order, and third-order effects radiating outward from the change point.

Arguments

$ARGUMENTS — format: [N] [path/to/diff or file or inline change description] where N is optional (default: 5, min 3, max 7)

Parse Arguments

Extract:

  • agent_count: the optional leading integer (default 5, min 3, max 7)
  • change_target: a diff file path, source file path, directory path, branch name, or inline description of the proposed change

If the target is missing or unclear, ask the user to clarify before proceeding.

Phase 1: Understand the Change

Determine the target type and build a precise understanding of what is changing:

  • If a diff or patch file: read it and identify every modified file, function, type, and config key
  • If a source file or directory: read it and ask the user what change is being made (or check for uncommitted changes via git diff)
  • If a branch name: run git diff main...<branch> (or the appropriate base) to extract the full changeset
  • If an inline description: parse it for the affected components

Prepare a change summary covering:

  • What is changing (the precise modification)
  • Where the change originates (files, functions, lines, config keys)
  • What type of change this is (code logic, schema migration, dependency upgrade, config change, API contract change, infrastructure change)
  • The stated intent of the change (why it is being made)

Present the change summary to the user and confirm before proceeding. Adjust if the user gives feedback.

Phase 2: Spawn Propagation Agents

Launch all N agents in parallel using the Agent tool. Each agent gets the change summary plus a unique propagation path selected from this list (assign sequentially, wrapping if N < 7):

Read the full file on GitHub · 223 lines

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. yesterday First seen · 223 lines · 0 tokens per session scan A 282fc2fca944

Subscribe to this mod's changes

diffuse is a skill published in the GitHub repository sjarmak/agent-workflows (9 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,669 tokens. 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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