impact

impact is a command for Claude Code from aahlijia/dekko. It costs 13 tokens per session (607 once invoked), scanned A, original, MIT.

A command that finds tests affected by changed code and prints a test command ready to run. It follows the code's call relationships instead of relying only on matching filenames or names.

In plain words
What is it for?
Use it after changing code to list impacted test files, group them by relationship, and obtain the project's runner command, such as pytest, Cargo, Go, or Gradle.
Why use it?
It narrows verification to tests that may be affected and explains whether each connection is direct, indirect, or only an import.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the dekko plugin — 8 skills, 4 commands, 1 MCP server shipped together

Good fit Use it after changing code to list impacted test files, group them by relationship, and obtain the project's runner command, such as pytest, Cargo, Go, or Gradle.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/aahlijia/dekko/impact
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.

Clone the repo
git clone --depth 1 https://github.com/aahlijia/dekko

Made for: Claude Code.

Or install dekko, the plugin that ships this one along with the rest of its 8 skills, 4 commands, 1 MCP server.

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 impact

README.md
[![agentmods](https://agentmods.dev/badge/commands/aahlijia/dekko/impact/github.svg)](https://agentmods.dev/commands/aahlijia/dekko/impact)
Your own site
<a href="https://agentmods.dev/commands/aahlijia/dekko/impact"><img src="https://agentmods.dev/badge/commands/aahlijia/dekko/impact/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for impact

Your own site · 80×15
<a href="https://agentmods.dev/commands/aahlijia/dekko/impact"><img src="https://agentmods.dev/badge/commands/aahlijia/dekko/impact.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 607 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 $0.00013 $0.00607
Opus 5.5 $0.00005 $0.00243
Sonnet 5.5 $0.00003 $0.00121
Haiku 4.5 $0.00001 $0.00061

Measured 19d ago against content hash 5986df317f43, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

impact 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 19d 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.

integrations/claude/commands/impact.md · 49 lines

How it starts

The opening of the file, as written. The whole thing — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Impacted tests

!dekko affected $ARGUMENTS

Your task

The report above was generated programmatically by dekko affected (reverse call-graph reachability from the changed symbols, plus an import-edge fallback). Do NOT re-derive it by grepping test files for the changed names.

  1. Relay the headline (N impacted test files vs REV) and the files grouped by the tier tag printed in brackets: [direct] calls changed code itself, [transitive] reaches it through the call graph, [import] only imports a changed file. Name one or two of the impacted symbols per file where that helps the user see why.
  2. The line(s) after the list that start with a test runner (pytest ..., cargo test ..., go test ..., the repo's package.json test script, ./gradlew ..., mvn ...) are the ready-to-run command. Show them verbatim in a code block. If the user asked to run the tests, run that command; otherwise offer to.
  3. If a runner line ends with # +N more impacted test files not shown; --budget 0 lists all, the report was budget-capped and the command is incomplete. Rerun dekko affected $ARGUMENTS --budget 0 and take the command from that output before running anything. If that lists hundreds of files, say so: running the whole suite is often the saner call, and on Windows a command line that long won't start.
  4. no impacted tests vs REV means no changed callable reaches a test file. Say so plainly. If the user expected a change to show, the default REV is the commit the map was generated at (else HEAD), so a change already committed needs an older base: suggest /impact <base-branch> or /impact HEAD~N.
  5. A note: counting tests that reach the change only through an ambiguous call: relay the count as "may also be impacted" and say that /impact REV --possible lists them, nearest the changed code first. They never join the command line.
  6. An error naming the rev (cannot export git rev ...) means an unknown rev or not a git repo: relay it and ask for a valid rev.
  7. These are leads, not verdicts: static analysis misses fixtures and dynamic dispatch. If the list looks thin for the size of the change, say that and point at the dekko-verify skill.

Read the full file on GitHub · 49 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. 19d ago First seen · 49 lines · 13 tokens per session scan A 5986df317f43

Subscribe to this mod's changes

impact is a command published in the GitHub repository aahlijia/dekko (5 stars, last pushed yesterday), licensed MIT. It adds 13 tokens to every session and 607 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-27.