What is xcode-build-fixer?

A tool for applying approved fixes to slow Xcode builds and measuring the result. It changes one logical fix at a time and records which files changed and how build time moved.

It is for implementing approved build-setting changes, script safeguards, or source-level fixes, then re-running benchmarks to verify them.

It keeps optimization changes controlled and reviewable, while checking that a fix improves builds instead of causing no improvement or a regression.

xcode-build-fixer — Skill by AvdLee

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/avdlee/xcode-build-optimization-agent-skill/xcode-build-fixer

Any agent

npx skills add AvdLee/Xcode-Build-Optimization-Agent-Skill --skill xcode-build-fixer

Clone the repo

git clone --depth 1 https://github.com/AvdLee/Xcode-Build-Optimization-Agent-Skill

Made for: Claude Code, Codex.

Per session 77 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,562 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	$0.00077	$0.02562
Opus 5	$0.00039	$0.01281
Sonnet 5	$0.00015	$0.00512
Haiku 4.5	$0.00008	$0.00256

Measured 3d ago against content hash 0904653e7871, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

xcode-build-fixer 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.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/benchmark_builds.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

xcode-build-fixer — 100% identical, 0 lines differ
xcode-build-fixer — 100% identical, 0 lines differ

skills/xcode-build-fixer/SKILL.md · 219 lines

How it starts

The opening of the file, as written. The whole thing — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Xcode Build Fixer

Use this skill to implement approved build optimization changes and verify them with a benchmark.

Core Rules

Only apply changes that have explicit developer approval.
Apply one logical fix at a time so changes are reviewable and reversible.
Re-benchmark after applying changes to verify improvement.
Report exactly what changed, which files were touched, and the measured delta.
If a change produces no improvement or causes a regression, flag it immediately.

Inputs

The fixer expects one of:

An approved optimization plan at .build-benchmark/optimization-plan.md with checked approval boxes.
An explicit developer instruction describing the fix to apply (e.g., "set DEBUG_INFORMATION_FORMAT to dwarf for Debug").

When working from an optimization plan, read the approval checklist and implement only the checked items.

Fix Categories

Build Settings

Change project.pbxproj values to match the recommendations in build-settings-best-practices.md.

Typical fixes:

Set DEBUG_INFORMATION_FORMAT = dwarf for Debug
Set SWIFT_COMPILATION_MODE = singlefile for Debug
Enable COMPILATION_CACHE_ENABLE_CACHING = YES
Enable EAGER_LINKING = YES for Debug
Align cross-target settings to eliminate module variants

When editing project.pbxproj, locate the correct buildSettings block by matching the target name and configuration name. Verify the change with xcodebuild -showBuildSettings after applying.

Script Phases

Fix run script phases that waste time during incremental or debug builds.

Typical fixes:

Add input and output file declarations so Xcode can skip unchanged scripts.
Add configuration guards: [[ "$CONFIGURATION" != "Release" ]] && exit 0 for release-only scripts.
Move input/output lists into .xcfilelist files when the list is long.
Enable Based on dependency analysis when inputs and outputs are declared.

Source-Level Compilation Fixes

Read the full file on GitHub · 219 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

3d ago First seen · 219 lines · 77 tokens per session scan A 0904653e7871

Subscribe to this mod's changes

xcode-build-fixer is a skill published in the GitHub repository AvdLee/Xcode-Build-Optimization-Agent-Skill (1,212 stars, last pushed 21d ago), licensed MIT. It adds 77 tokens to every session and 2,562 once invoked, about $0.0004 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 2026-08-30.

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