Impact

What it does

When your agent uses it

• Asks to analyze impact of changes
• Check blast radius
• What would break if I change this
• Refactoring safety analysis

Example prompts

• “analyze impact of changes”
• “check blast radius”
• “what would break if I change this”
• “/impact”

Requirements

• Compatibility (from SKILL.md): Requires grepika MCP server.
• Pre-approved tools (allowed-tools): mcp__grepika__search, mcp__grepika__refs, mcp__grepika__outline, mcp__grepika__context, mcp__grepika__get, mcp__grepika__graph, mcp__grepika__structural_search, mcp__grepika__add_workspace

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Find all direct references
2. 2Discover dependent files
3. 3Search for similar patterns
4. 4Identify test coverage
5. 5Extract file structures

What it can do on your machine

Read from SKILL.md and the folder at commit f035a18. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • mcp__grepika__search
  • mcp__grepika__refs
  • mcp__grepika__outline
  • mcp__grepika__context
  • mcp__grepika__get
  • mcp__grepika__graph
  • mcp__grepika__structural_search
  • mcp__grepika__add_workspace

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md.

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  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.

• Compatibility

  Requires grepika MCP server.

  From compatibility in the SKILL.md frontmatter.

Context cost

Impact loads about 794 tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 64 tokens; SKILL.md has 222 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~64

When it runs · the whole SKILL.md, loaded when a task matches

~794

With references · SKILL.md plus every file in references/, read only if the agent opens them

~1.9k

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

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 adamthewilliam/grepika at commit f035a18, republished under its MIT licence (© adamthewilliam). 222 words, ~794 tokens.

name

impact

description

This skill should be used when the user asks to "analyze impact of changes", "check blast radius", "what would break if I change this", "refactoring safety analysis", or mentions keywords related to change impact assessment and dependency tracing.

allowed-tools

mcp__grepika__search, mcp__grepika__refs, mcp__grepika__outline, mcp__grepika__context, mcp__grepika__get, mcp__grepika__graph, mcp__grepika__structural_search, mcp__grepika__add_workspace

compatibility

Requires grepika MCP server.

version

1.1.0

disable-model-invocation

true

context

fork

agent

Explore

model

haiku

## Impact Analysis: [target]

### Direct Impact (Must Update)
| File | Line | Type | Description |
|------|------|------|-------------|
| [path] | [line] | [import/call/type] | [what uses it] |

### Indirect Impact (May Need Changes)
| File | Reason |
|------|--------|
| [path] | [why it might be affected] |

### Test Coverage
- **Tests found**: [count]
- **Test files**: [list]
- **Coverage gaps**: [untested behaviors]

### Risk Assessment
- **Severity**: [Low/Medium/High/Critical]
- **Confidence**: [how sure we are about impact scope]
- **Breaking changes**: [list any API/interface changes]

### Safe Refactoring Steps
1. [ordered steps to make the change safely]
2. [what to test at each step]

### Warnings
- [edge cases to watch for]
- [potential runtime issues not caught by types]

© adamthewilliam, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in plugins/grepika/skills/impact of adamthewilliam/grepika.

• SKILL.md
• references/risk-assessment.md

Open the folder on GitHubat commit f035a18