blast-radius

blast-radius is a skill for Claude Code from pedrohcgs/claude-code-my-workflow. It costs 97 tokens per session (1,326 once invoked), scanned A, original, MIT.

A checklist for finding every user of a shared piece of code or data before changing it.

In plain words
What is it for?
It helps trace function calls, imports, schemas, labels, configuration values, file formats, and consumers in other repositories, then run those consumers to verify compatibility.
Why use it?
It reduces the risk that an apparently small change breaks a caller, test, script, or generated result elsewhere.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit It helps trace function calls, imports, schemas, labels, configuration values, file formats…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pedrohcgs/claude-code-my-workflow/blast-radius
About the project

claude-code-my-workflow is a forkable setup for using Claude Code to produce and review academic papers, slides, data analyses, and replication packages. Researchers use its agents, skills, rules, hooks, and quality checks to coordinate these tasks and verify their results. The catalogue entries define the reusable workflow components for Claude Code.

pedrohcgs/claude-code-my-workflow · 1,566 stars · on GitHub · psantanna.com

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.

Any agent
npx skills add pedrohcgs/claude-code-my-workflow --skill blast-radius
Clone the repo
git clone --depth 1 https://github.com/pedrohcgs/claude-code-my-workflow

Made for: Claude Code.

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 blast-radius

README.md
[![agentmods](https://agentmods.dev/badge/skills/pedrohcgs/claude-code-my-workflow/blast-radius.svg)](https://agentmods.dev/skills/pedrohcgs/claude-code-my-workflow/blast-radius)
Your own site
<a href="https://agentmods.dev/skills/pedrohcgs/claude-code-my-workflow/blast-radius"><img src="https://agentmods.dev/badge/skills/pedrohcgs/claude-code-my-workflow/blast-radius.svg" alt="Measured on agentmods" height="20"></a>
Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,326 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00097 $0.01326
Opus 5 $0.00048 $0.00663
Sonnet 5 $0.00019 $0.00265
Haiku 4.5 $0.00010 $0.00133

Measured 7d ago against content hash b4c9f1693f5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

blast-radius 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 7d 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.

.claude/skills/blast-radius/SKILL.md · 75 lines

How it starts

The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Know the blast radius before you change it

The dangerous change is not the risky-looking one. It is the one that looks purely additive — adding a returned value, a column, an option — and quietly violates a contract three files away that nobody re-read. Compilation and type checks will not catch a positional or length contract; you get either a crash far from the edit, or worse, silently wrong output.

Rule: if you change a shared interface, run its consumers. Reading them is not running them.

1. Enumerate consumers before editing

Grep for every call site, import, and downstream reference — including tests, notebooks, scripts, docs, and anything that regenerates reported results. Note which ones produce numbers that appear in a paper, dashboard, or release: those are the ones where silent breakage is most costly.

If a consumer lives in another repo, another language, or a generated artifact, write it down now; you will not remember at verification time.

A consumer in another repo pins this one by commit SHA. Its verification receipt records the revision it was built against — not a branch, not a version string, both of which keep moving under it. So a change here that moves a number the downstream reports is not finished when this repo goes green: before/after evidence for what moved, regeneration of the downstream artifact, and the re-pin all belong to the same round as the change — release-engineering.md §6 has the ordering within it. A downstream left pinned to the old SHA is an honest, inspectable state; one pointed at a moving reference silently inherits a number nobody re-verified.

2. Name the contract you are about to change

Ask explicitly what downstream code is entitled to assume:

  • Arity / length — does anything index positionally, zip against a fixed list, or preallocate a matrix of known width? Adding an element breaks all three.
  • Names and order — does anything match by name, by position, or pair your output against a separate parallel list of labels?
  • Types, units, scale — dollars vs cents, rate vs percent, seconds vs ms, 0-indexed vs 1-indexed.
  • Nullability and sentinels — new empty/NA cases a consumer will not expect.
  • Defaults — changing a default silently changes every caller that relied on it.
  • Identity/ordering guarantees — row order, sort stability, key uniqueness.

Read the full file on GitHub · 75 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. 7d ago First seen · 75 lines · 97 tokens per session scan A b4c9f1693f5b

Subscribe to this mod's changes

blast-radius is a skill published in the GitHub repository pedrohcgs/claude-code-my-workflow (1,566 stars, last pushed 13d ago), licensed MIT. It adds 97 tokens to every session and 1,326 once invoked, about $0.0005 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.

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