impact

impact is a skill for Claude Code, Codex from perilevy/lsp-intelligence. It costs 20 tokens per session (283 once invoked), scanned A, original, MIT.

A change-impact check for a named code symbol, such as a function, class, or type. It traces direct and indirect uses and finds related tests.

In plain words
What is it for?
Use it to inspect imports, callers, re-exports, type aliases, and tests affected by renaming or changing a symbol.
Why use it?
It shows which files and tests may need changes before you edit shared code. It also estimates whether the change affects only a few places or many.

Skill for Claude CodeCodex

Part of the lsp-intelligence plugin — 8 skills, 2 hooks, 1 MCP server shipped together

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 skills/perilevy/lsp-intelligence/impact
Any agent
npx skills add perilevy/lsp-intelligence --skill impact
Clone the repo
git clone --depth 1 https://github.com/perilevy/lsp-intelligence

Made for: Claude Code, Codex.

Or install lsp-intelligence, the plugin that ships this one along with the rest of its 8 skills, 2 hooks, 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/skills/perilevy/lsp-intelligence/impact.svg)](https://agentmods.dev/skills/perilevy/lsp-intelligence/impact)
Your own site
<a href="https://agentmods.dev/skills/perilevy/lsp-intelligence/impact"><img src="https://agentmods.dev/badge/skills/perilevy/lsp-intelligence/impact.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 283 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 $0.00020 $0.00283
Opus 5 $0.00010 $0.00142
Sonnet 5 $0.00004 $0.00057
Haiku 4.5 $0.00002 $0.00028

Measured 3d ago against content hash 343d8cbf0a8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 3d 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.

skills/impact/SKILL.md · 22 lines

What it actually says

Impact Analysis

Analyze the full impact of changing the symbol the user specified.

Steps

  1. Run impact_trace with the user's symbol name. If the user passed --depth <number>, use that as max_depth; otherwise default to 3. If it returns no results, run workspace_symbols with the same query to suggest similar names — the user may have a typo or the symbol may live in a non-TS file.
  2. Run find_test_files with the same symbol to identify tests that need updating
  3. Present a summary:
    • Severity: LOW (< 5 refs), MEDIUM (5-20 refs), HIGH (> 20 refs)
    • Direct references: files that import/call the symbol directly
    • Transitive references: files affected through type aliases or re-exports
    • Affected tests: test/spec/stories files that reference the symbol
  4. If severity is HIGH, suggest running gather_context on the most affected files before proceeding
  5. If the user wants to continue, offer to run outline on the files they'll need to modify
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. 3d ago First seen · 22 lines · 20 tokens per session scan A 343d8cbf0a8f

Subscribe to this mod's changes

impact is a skill published in the GitHub repository perilevy/lsp-intelligence (1 stars, last pushed 5mo ago), licensed MIT. It adds 20 tokens to every session and 283 once invoked, about $0.0001 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 2026-08-31.

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