impact-check

A file-impact analysis command that examines what depends on a file and what the file depends on.

In plain words
What is it for?
Use it before changing a file to identify affected modules, important dependent functions, imports, coupling concerns, and tests to run.
Why use it?
It helps reveal indirect breakage risks before you edit shared code.

Command for Claude Code

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 commands/suitable-adventures/suitable-loop/impact-check
Clone the repo
git clone --depth 1 https://github.com/suitable-adventures/suitable-loop

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 170 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 $0.00170
Opus 5 $0.00000 $0.00085
Sonnet 5 $0.00000 $0.00034
Haiku 4.5 $0.00000 $0.00017

Measured yesterday against content hash 71fd5b16c6fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

impact-check 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.

.claude/commands/impact-check.md · 17 lines

What it actually says

I'm about to change the file: $ARGUMENTS

Before I make changes, analyze the impact.

Steps:

  1. Use blast_radius on the specified file to find all transitively affected files
  2. Use query_entity on key functions/classes in the file to understand their relationships
  3. Use find_callers on the most important functions to see what depends on them
  4. Use dependency_tree on the file to see its import chain

Then give me:

  • The blast radius: how many files are affected if this file breaks
  • A list of the affected files, grouped by app/module
  • The key functions in this file and who calls them
  • What this file depends on (its imports)
  • Practical advice: what to test after making changes, what could break, any coupling concerns
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 · 17 lines · 0 tokens per session scan A 71fd5b16c6fd

Subscribe to this mod's changes

impact-check is a command published in the GitHub repository suitable-adventures/suitable-loop (0 stars, last pushed 5mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 170 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.