A troubleshooting guide for Swift and Metal builds in Xcode, Swift Package Manager plugins, and GitHub Actions. GitHub Actions is a service that runs automated build and test jobs.

It helps diagnose xcodebuild errors, Metal compilation problems, code-generation plugin failures, test failures, and CI failures.

It gives a structured way to distinguish source-code, shader, plugin, test, and continuous-integration failures before applying a fix.

How Koshimizu-Takehito/my-toybox configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Koshimizu-Takehito/my-toybox. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Koshimizu-Takehito/my-toybox/develop/.claude/commands/debug-build.md

Clone the repo

git clone --depth 1 https://github.com/Koshimizu-Takehito/my-toybox

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/koshimizu-takehito/my-toybox/debug-build/github.svg)](https://agentmods.dev/commands/koshimizu-takehito/my-toybox/debug-build)

Your own site

<a href="https://agentmods.dev/commands/koshimizu-takehito/my-toybox/debug-build"><img src="https://agentmods.dev/badge/commands/koshimizu-takehito/my-toybox/debug-build/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/koshimizu-takehito/my-toybox/debug-build"><img src="https://agentmods.dev/badge/commands/koshimizu-takehito/my-toybox/debug-build.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,930 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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 5.1	$0.00000	$0.01930
Opus 5.5	$0.00000	$0.00772
Sonnet 5.5	$0.00000	$0.00386
Haiku 4.5	$0.00000	$0.00193

Measured 2mo ago against content hash d5fe6baa3627, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

debug-build 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 2mo 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.

.claude/commands/debug-build.md · 242 lines

How it starts

The opening of the file, as written. The whole thing — 242 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build Debugger

Diagnose and fix xcodebuild, SPM plugin, and CI build failures.

Task

You are the ci-debugger agent. Your mission is to diagnose build failures, test failures, and CI issues, then provide actionable fixes.

Build System Overview

MyToybox uses three build systems:

xcodebuild: Main compilation via workspace (Swift, Metal, resources)
SPM Plugins: Code generation (BuildMetalShaders)
GitHub Actions CI: Automated validation

Diagnostic Steps

1. Identify Failure Type

Ask the user or determine from context:

Build failure: Won't compile
Test failure: Tests failing
Plugin failure: Code generation errors
CI failure: GitHub Actions failing

2. Build Failure Diagnosis

Run Full Build:

xcodebuild -workspace MyToybox.xcworkspace -scheme MyToybox \
  -destination 'platform=iOS Simulator,name=iPhone 17,OS=26.4' \
  CODE_SIGNING_ALLOWED=NO clean build

Common Build Errors:

Swift Compilation Errors

Symptom: "Type 'Foo' does not conform to protocol 'Bar'"
Diagnosis: Check protocol conformance, missing methods
Fix: Implement required protocol methods

Metal Compilation Errors

Symptom: "Compilation succeeded with warnings for file '...metal'"
Diagnosis: Check Metal shader syntax, function signatures
Fix: Review shader code, check [[stitchable]] attribute
Deep Dive: Look for .air file generation in build output

Missing Resources

Symptom: "Could not find resource '...'"
Diagnosis: Check Bundle.module access, resource bundle config
Fix: Verify file is in correct Resources/ directory

Macro Expansion Errors

Symptom: "Cannot find type 'XxxScreen' in scope" (from @Screens macro)
Diagnosis: The screen View type referenced by a Screen enum case does not exist
Fix: Create the missing View type in Packages/Sources/Screens/

Concurrency Errors (Swift 6)

Symptom: "Call to main actor-isolated ... from non-isolated context"
Diagnosis: Missing @MainActor annotation or improper async context
Fix: Add @MainActor or use await MainActor.run { ... }

Read the full file on GitHub · 242 lines

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.

2mo ago First seen · 242 lines · 0 tokens per session scan A d5fe6baa3627

Subscribe to this mod's changes

debug-build is a command published in the GitHub repository Koshimizu-Takehito/my-toybox (118 stars, last pushed 6d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,930 tokens. 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 2026-09-04.

CI and CD Debugging DevOps and cloud

debug-build next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
debug-buildKoshimizu-Takehito/my-toybox	Command	118	6d ago	MIT	A	0	Claude Code
dart-fix-cidartsim/dart	Command	1.2k	yesterday	BSD-2-Clause	A	6	Claude Code
ci-debugyonatangross/orchestkit	Command	299	yesterday	MIT	A	55	Claude Code, Cursor
metricsgotempsh/temps	Command	903	yesterday	Apache-2.0	A	0	Claude Code
tracesgotempsh/temps	Command	903	yesterday	Apache-2.0	A	0	Claude Code
add-debug-waitopenshift-eng/ai-helpers	Command	122	yesterday	Apache-2.0	A	12	Claude Code
pr-quality-gate-reliabilityrjmurillo/ai-agents	Command	49	yesterday	MIT	A	0	GitHub Copilot

my-toybox: Command for Claude Code