Agent skill

Assess Impact

by danielvm-git in danielvm-git/bigpowers

Analyze the blast radius of a proposed change before any code is written.

MITAuto-check passedTesting & QA

Install Assess Impact

skills CLI

$ npx skills add danielvm-git/bigpowers --skill assess-impact -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install danielvm-git/bigpowers assess-impact --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/danielvm-git/bigpowers.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/assess-impact .claude/skills/assess-impact && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "assess-impact" agent skill from https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact into .claude/skills/assess-impact/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assess-impact", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add danielvm-git/bigpowers --skill assess-impact -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install danielvm-git/bigpowers assess-impact --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danielvm-git/bigpowers.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/assess-impact .agents/skills/assess-impact && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "assess-impact" agent skill from https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact into .agents/skills/assess-impact/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assess-impact", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add danielvm-git/bigpowers --skill assess-impact -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install danielvm-git/bigpowers assess-impact --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danielvm-git/bigpowers.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/assess-impact .cursor/skills/assess-impact && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "assess-impact" agent skill from https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact into .cursor/skills/assess-impact/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assess-impact", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/danielvm-git/bigpowers.git --path skills/assess-impact

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add danielvm-git/bigpowers --skill assess-impact -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install danielvm-git/bigpowers assess-impact --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danielvm-git/bigpowers.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/assess-impact .gemini/skills/assess-impact && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "assess-impact" agent skill from https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact into .gemini/skills/assess-impact/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assess-impact", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install danielvm-git/bigpowers assess-impact

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add danielvm-git/bigpowers --skill assess-impact -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/danielvm-git/bigpowers.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/assess-impact .github/skills/assess-impact && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "assess-impact" agent skill from https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact into .github/skills/assess-impact/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assess-impact", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add danielvm-git/bigpowers --skill assess-impact -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install danielvm-git/bigpowers assess-impact --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danielvm-git/bigpowers.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/assess-impact .opencode/skills/assess-impact && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "assess-impact" agent skill from https://github.com/danielvm-git/bigpowers/tree/main/skills/assess-impact into .opencode/skills/assess-impact/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assess-impact", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: assess-impact
GitHub stars: 256
Token cost: ~766 tokens
SKILL.md length: 298 words
Files: 1
Skills in repo: 39
Repo updated: Sep 21, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Analyze the blast radius of a proposed change before any code is written.

Works in 6 steps: Identify the target → Find dependents → Map to release plan stories → …
Asks what does this break?
SKILL.md covers Modes, Process and Risk score gating
Calls git

What it does

Assess Impact is an agent skill from danielvm-git/bigpowers. Analyze the blast radius of a proposed change before any code is written. Maps dependents, affected stories, and test coverage. Produces specs/IMPACTLATEST.md. Use before plan-work on any non-trivial change, when touching a shared module, or when the user asks "what does this break?".

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Test coverage. The repository describes itself as: Agent skills synthesizing years of software engineering discipline into a prescriptive methodology for solo developers. The licence is MIT.

When your agent uses it

Asks what does this break?
Tasks that involve Test coverage

Example prompts

“what does this break?”
“/assess-impact”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

Identify the target
Find dependents
Map to release plan stories
List test coverage
Classify risk
Write specs/IMPACT_LATEST.md

What it can do on your machine

Read from SKILL.md and the folder at commit 812d57a. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- git
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Assess Impact loads about 766 tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 298 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~75
When it runs · the whole SKILL.md, loaded when a task matches: ~766

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from danielvm-git/bigpowers at commit 812d57a, republished under its MIT licence (© danielvm-git). 298 words, ~766 tokens.

Download SKILL.mdSave it as .claude/skills/assess-impact/SKILL.md (or your agent's skills folder).

name: assess-impact
description: Analyze the blast radius of a proposed change before any code is written. Maps dependents, affected stories, and test coverage. Produces specs/IMPACT_LATEST.md. Use before plan-work on any non-trivial change, when touching a shared module, or when the user asks "what does this break?".
model: sonnet
effort: standard

Assess Impact

HARD GATE — Run this skill before plan-work whenever a change touches an existing module, symbol, or file used by more than one caller. Skip only for net-new code with no existing dependents.

Find the blast radius of the proposed change before a single line is written.

Modes

Default: full impact analysis (dependents + affected stories + test coverage mapping)
--lightweight: Fast fan-in/fan-out only (<10s). Maps callers and imports without test coverage mapping. Used by build-epic step 2 as a pre-plan gate. Risk score > 7 triggers a mandatory grill-me session before proceeding.

Process

1. Identify the target

Name the symbol, module, or file being changed. If the user hasn't specified, ask one question: "What exactly are you changing?"

2. Find dependents

grep -rn "[symbol-name]" . --include="*.ts" | grep -v node_modules
git log --oneline -10 -- [file-path]

→ verify: test -f specs/IMPACT_LATEST.md || test -d specs/bugs

3. Map to release plan stories

Read specs/release-plan.yaml + epic capsule directories (if it exists). For each dependent found in Step 2, identify which story owns that module. List stories that will be affected by the change.

→ verify: test -f specs/release-plan.yaml && grep -ci "stor" specs/release-plan.yaml

4. List test coverage

Find tests that exercise the target:

grep -rn "[symbol-name]" . --include="*.test.*" --include="*.spec.*"

→ verify: test -d specs/epics || test -d skills

5. Classify risk

Level	Condition
Low	≤ 2 callers, all covered by tests
Medium	3–10 callers, partial test coverage
High	> 10 callers, or shared API/interface, or no tests

6. Write specs/IMPACT_LATEST.md

## Target
[symbol or file being changed]

## Dependents ([count])
- [file]: [caller or usage]

## Affected Stories
- Story [X.Y]: [title]

## Test Coverage
- [test file]: covers [scenario]
- Gap: [untested behavior]

## Risk: Low / Medium / High
[One-sentence rationale]

## Recommended action
[Proceed / Add tests first / Discuss design]

→ verify: grep "Risk:" specs/IMPACT_LATEST.md

Suggest plan-work once risk is understood and any test gaps are noted.

Risk score gating

In --lightweight mode (used by build-epic step 2), assign a numeric risk score (1–10):

Fan-in (how many callers): 0–4 points
Fan-out (how many dependencies the module itself uses): 0–3 points
Recent churn (git log --oneline -5 count): 0–3 points

Risk score > 7: Gate — require a grill-me session before proceeding to implementation. Document the grill-me result in the impact report at specs/IMPACT-<epic>-<story>.md.

Files

Just SKILL.md in skills/assess-impact of danielvm-git/bigpowers.

Open the folder on GitHubat commit 812d57a

Compare with similar skills

Assess Impact next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Assess Impact compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Assess Impact this skilldanielvm-git/bigpowers	256	—	~766	Automated safety check: Pass	MIT	16 days ago
Requirementsrizsotto/Bear	6.5k	—	~2k	Automated safety check: Pass	GPL-3.0	today
Crap Analysisardalis/RiverBooks	134	2 repos	~3.4k	Automated safety check: Pass	None	2 days ago
Code Coverages3s-project/s3s	311	—	~789	Automated safety check: Pass	Apache-2.0	today
Project Statusbactopia/bactopia	522	—	~787	Automated safety check: Pass	MIT	2 mo ago
Check Coverageldayton/Dippy	243	—	~403	Automated safety check: Pass	MIT	3 mo ago

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Questions about Assess Impact

What does Assess Impact do?

Analyze the blast radius of a proposed change before any code is written. Assess Impact is an agent skill from danielvm-git/bigpowers. Analyze the blast radius of a proposed change before any code is written.

When should I use Assess Impact?

Assess Impact fits situations like: asks what does this break?; tasks that involve Test coverage.

How do I install Assess Impact in Claude Code?

Run `npx skills add danielvm-git/bigpowers --skill assess-impact -a claude-code`. Or copy the skill folder (skills/assess-impact in danielvm-git/bigpowers) into .claude/skills/assess-impact in your project. Claude Code loads it when a task matches its description.

How do I install Assess Impact in Codex?

Run `npx skills add danielvm-git/bigpowers --skill assess-impact -a codex`. Or copy the skill folder (skills/assess-impact in danielvm-git/bigpowers) into .agents/skills/assess-impact in your project. Codex loads it when a task matches its description.

Can I use Assess Impact in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add danielvm-git/bigpowers --skill assess-impact -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/assess-impact, .gemini/skills/assess-impact, .github/skills/assess-impact and .opencode/skills/assess-impact in your project.

What does Assess Impact need to run?

Going by SKILL.md and its folder, Assess Impact needs the command-line tools its instructions call (git).

Does Assess Impact access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Assess Impact safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Assess Impact use?

Assess Impact is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Assess Impact use?

About 766 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Assess Impact?

Skills that share tags, products or a category with Assess Impact: Requirements (rizsotto/Bear, 6.5k stars), Crap Analysis (ardalis/RiverBooks, 134 stars), Code Coverage (s3s-project/s3s, 311 stars) and Project Status (bactopia/bactopia, 522 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Assess Impact?

danielvm-git (a GitHub user) maintains it in danielvm-git/bigpowers, which has 256 GitHub stars. The repository holds 39 skills in this directory. The repository was last updated on September 21, 2026.

Source: danielvm-git/bigpowers on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Assess Impact

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Assess Impact

Modes

Process

1. Identify the target

2. Find dependents

3. Map to release plan stories

4. List test coverage

5. Classify risk

6. Write specs/IMPACT_LATEST.md

Risk score gating

Files

Compare with similar skills

Similar skills

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Related

Questions about Assess Impact