What is code-simplify?

A command for making C# code easier to read and maintain while keeping its behavior unchanged. It looks for issues such as deep nesting, long methods, unclear names, repeated logic, and outdated asynchronous patterns.

Use it to simplify recently changed code or a specified area, including splitting methods, adding guard clauses, improving names, removing dead code, and consolidating repeated logic.

Complex code takes longer to understand and is easier to change incorrectly. Incremental simplification followed by tests and a warning-checked build helps confirm that cleanup did not alter the result.

code-simplify — Command by peterblazejewicz

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 commands/peterblazejewicz/claude-plugins/code-simplify

Clone the repo

git clone --depth 1 https://github.com/peterblazejewicz/claude-plugins

Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 525 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.

Model	Per session	Once invoked
Fable 5	$0.00016	$0.00525
Opus 5	$0.00008	$0.00262
Sonnet 5	$0.00003	$0.00105
Haiku 4.5	$0.00002	$0.00052

Measured 2d ago against content hash 03b451058203, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-simplify 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 2d 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.

plugins/dotnet-skills/commands/code-simplify.md · 33 lines

What it actually says

Invoke the dotnet-skills:code-simplification skill.

Simplify recently changed code (or the specified scope) while preserving exact behavior:

Read CLAUDE.md and study project conventions — .editorconfig, analyzer severity, naming conventions, layering rules
Identify the target code — recent changes unless a broader scope is specified
Understand the code's purpose, callers, edge cases, and test coverage before touching it
Scan for C#-specific simplification opportunities:
- Deep nesting → guard clauses or extracted helpers
- Long methods → split by responsibility
- Nested ternaries → switch expressions or if/else
- Generic names → descriptive names aligned with .editorconfig
- Manual null checks → ??, ?., pattern-matching (is { } x), or ArgumentNullException.ThrowIfNull
- async void and sync-over-async → proper Task/ValueTask with CancellationToken
- Mutable DTOs → record / record struct
- Duplicated logic → shared methods, extension methods, or required properties
- Dead code → remove after confirming with callers and tests
Apply each simplification incrementally — run dotnet test and dotnet build -warnaserror after each change
Verify all tests pass, the build succeeds warning-free, dotnet format --verify-no-changes is clean, and the diff is tight

If tests fail after a simplification, revert that change and reconsider. Use dotnet-skills:code-review-and-quality to review the result.

Source & Modifications

Upstream: addyosmani/agent-skills — .claude/commands/code-simplify.md at pinned SHA 44dac80
Status: modified (skill references retargeted to the dotnet-skills: prefix; convention-sources list adds .editorconfig / analyzer severity / layering rules; simplification scan gains C#-idiomatic opportunities — null-coalescing, pattern-matching, ArgumentNullException.ThrowIfNull, async correctness, record/record struct; verification commands are dotnet test, dotnet build -warnaserror, dotnet format --verify-no-changes)

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.

2d ago First seen · 33 lines · 16 tokens per session scan A 03b451058203

Subscribe to this mod's changes

code-simplify is a command published in the GitHub repository peterblazejewicz/claude-plugins (7 stars, last pushed 2mo ago), licensed MIT. It adds 16 tokens to every session and 525 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.

agentic-ai avalonia claude-code copilot csharp developer-experience

code-simplify

Getting it into your agent

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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