Xcode Build Optimization Agent Skills is a collection of agent skills that benchmarks and analyzes Xcode clean and incremental builds, compiler hotspots, project settings, and Swift Package Manager overhead. It is for iOS developers who want an AI coding agent to identify build-performance improvements and produce an optimization plan before changes are approved. The catalogue entries provide the skills, instructions, and plugin used for this workflow.
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.
npx skills add AvdLee/Xcode-Build-Optimization-Agent-Skill --skill xcode-build-fixergit clone --depth 1 https://github.com/AvdLee/Xcode-Build-Optimization-Agent-SkillWrote 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.
[](https://agentmods.dev/skills/avdlee/xcode-build-optimization-agent-skill/xcode-build-fixer)<a href="https://agentmods.dev/skills/avdlee/xcode-build-optimization-agent-skill/xcode-build-fixer"><img src="https://agentmods.dev/badge/skills/avdlee/xcode-build-optimization-agent-skill/xcode-build-fixer/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.
<a href="https://agentmods.dev/skills/avdlee/xcode-build-optimization-agent-skill/xcode-build-fixer"><img src="https://agentmods.dev/badge/skills/avdlee/xcode-build-optimization-agent-skill/xcode-build-fixer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00077 | $0.02562 |
| Opus 5.5 | $0.00031 | $0.01025 |
| Sonnet 5.5 | $0.00015 | $0.00512 |
| Haiku 4.5 | $0.00008 | $0.00256 |
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 1mo 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.
Copies of this mod
3 near-identical copies found in the catalogue:
- xcode-build-fixer — 100% identical, 0 lines differ
- xcode-build-fixer — 100% identical, 0 lines differ
- xcode-build-fixer — 95% identical, 8 lines differ
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.mdwith checked approval boxes. - An explicit developer instruction describing the fix to apply (e.g., "set
DEBUG_INFORMATION_FORMATtodwarffor 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 = dwarffor Debug - Set
SWIFT_COMPILATION_MODE = singlefilefor Debug - Enable
COMPILATION_CACHE_ENABLE_CACHING = YES - Enable
EAGER_LINKING = YESfor 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 0for release-only scripts. - Move input/output lists into
.xcfilelistfiles when the list is long. - Enable
Based on dependency analysiswhen inputs and outputs are declared.
Source-Level Compilation Fixes
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.
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.
- 1mo ago First seen · 219 lines · 77 tokens per session scan A 0904653e7871
xcode-build-fixer is a skill published in the GitHub repository AvdLee/Xcode-Build-Optimization-Agent-Skill (1,264 stars, last pushed 1mo ago), licensed MIT. It adds 77 tokens to every session and 2,562 once invoked, about $0.0003 per session on Opus 5.5. 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.
Other skills, from other repositories
ios-design-agent-skill
Audit and improve iOS/SwiftUI app aesthetics — typography, color, spatial composition, motion, and atmospheric depth. Use when reviewing UI design, critiquing screenshots, or improving SwiftUI view code beyond functional correctness.
new
Create a new project to start development quickly.
oss-upload
Upload local files to Tencent COS (oss.1024code.com CDN) using coscli. Use when user wants to upload a file to CDN/OSS, or deploy static assets.
officecli-word-form
Use this skill to create fillable Word forms (.docx) with real Content Controls (SDT) + legacy FormField checkboxes + MERGEFIELD mail-merge placeholders + document protection. Trigger on: 'fillable form', 'form fields', 'content controls', 'SDT', 'word form', 'fill in', 'only editable fields', 'protect document'…
windbg-user-heap-corruption-investigation
Use when an app, service, or user-mode driver host heap fails or Application Verifier detects corruption; inspect history and bounds. Not for kernel pool corruption or ordinary OOM.
openagentskill-registry
Discover, compare, audit, and safely install reusable AI Agent Skills with OpenAgentSkill. Use whenever an agent needs a capability it does not already have, must compare Skill alternatives, or needs evidence before installing third-party instructions.