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Abstract State Analyzer

A static-analysis skill that applies abstract interpretation to infer variable ranges and flag potential runtime errors — out-of-bounds, null dereference, divide-by-zero, integer overflow — without running the code.

Security & ReviewAdvanced★ 236⑂ 22AI score 7/10Last updated: Aug 21, 2026

What it does

  • Runs abstract interpretation over your source code to infer the set of possible program states and variable values at each point, with no execution required.
  • Picks suitable abstract domains: Interval (numeric ranges), Sign, Null (null / not-null / maybe-null), Type, or a combination for extra precision.
  • Splits state across conditional branches, joins states at merge points, iterates loops to a fixpoint, and applies widening when convergence stalls.
  • Checks each operation for violations: array bounds, null dereference, division by zero, integer overflow, and type inconsistency.
  • Reports findings in a fixed format: location, error type, abstract state at that point, severity (definite vs. potential), explanation, and a concrete fix suggestion.
  • Includes language-specific guidance for C/C++, Python, Java, and JavaScript (pointer arithmetic, dynamic typing, NPEs, type coercion), plus techniques like function summaries and path sensitivity.

Who it's for

  • Developers who want to catch crash-prone code paths during review or before a release.
  • Maintainers of legacy code with thin test coverage who need a safety argument for a function.
  • Learners and educators practicing static analysis and abstract-domain reasoning.
  • Security reviewers auditing memory and value safety (buffer overruns, null access).

Example uses

  1. Array bounds audit: paste find_max(arr, n) and it flags that arr[i] can escape the buffer when n > len(arr), suggesting the precondition n <= len(arr).
  2. Divide-by-zero check: if a denominator is inferred as [-5, 5], zero is in the range, so it is reported as a potential exception.
  3. Null dereference trace: it finds paths where a maybe-null parameter reaches ptr.field and proposes where to insert the guard.
  4. Overflow prediction: with a, b both in [1000, 2000], it warns that the int32 multiplication may overflow.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/ArabelaTso/Skills-4-SE/HEAD/skills/abstract-state-analyzer/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/abstract-state-analyzer folder from the GitHub repo ArabelaTso/Skills-4-SE into my ~/.claude/skills/abstract-state-analyzer/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/ArabelaTso/Skills-4-SE.git && mkdir -p ~/.claude/skills && cp -r Skills-4-SE/skills/abstract-state-analyzer ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal (Terminal on macOS/Linux, WSL or Git Bash on Windows).
  2. Clone the repository: 
    git clone https://github.com/ArabelaTso/Skills-4-SE.git
  3. Create the Claude Code skills directory if it does not exist: 
    mkdir -p ~/.claude/skills
  4. Copy the whole skill folder so the references/ files come along: 
    cp -r Skills-4-SE/skills/abstract-state-analyzer ~/.claude/skills/
  5. Verify the install: 
    ls ~/.claude/skills/abstract-state-analyzer
  6. Restart Claude Code and ask something like "analyze this function with abstract interpretation and list potential runtime errors" to trigger the skill.
  7. For best accuracy, include the file path or paste the exact code block you want analyzed.
View source on GitHub ↗License: Apache-2.0