Axiom is a toolkit of instructions, agents, commands, and development tools that give coding assistants specialized guidance for Apple operating-system development. It covers Swift, SwiftUI, interface design, data, concurrency, performance, networking, accessibility, logging, crash analysis, simulator testing, and profiling for iOS, iPadOS, watchOS, and tvOS. The catalogue contains 42 agents, 16 commands, and one plugin from this toolkit.
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.
git clone --depth 1 https://github.com/CharlesWiltgen/AxiomWrote 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/commands/charleswiltgen/axiom/axiom-optimize-build)<a href="https://agentmods.dev/commands/charleswiltgen/axiom/axiom-optimize-build"><img src="https://agentmods.dev/badge/commands/charleswiltgen/axiom/axiom-optimize-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.
<a href="https://agentmods.dev/commands/charleswiltgen/axiom/axiom-optimize-build"><img src="https://agentmods.dev/badge/commands/charleswiltgen/axiom/axiom-optimize-build.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00027 | $0.00273 |
| Opus 5 | $0.00014 | $0.00137 |
| Sonnet 5 | $0.00005 | $0.00055 |
| Haiku 4.5 | $0.00003 | $0.00027 |
Grade A, and why
axiom-optimize-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 4d 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.
What it actually says
Optimize Build Performance
Delegate to the build-optimizer subagent to scan your Xcode project for build performance optimization opportunities.
What It Does
The agent will:
- Scan build settings for quick wins (compilation mode, architecture settings)
- Check build phase scripts for conditional execution
- Identify type checking performance issues
- Detect suboptimal compiler flags
- Provide specific fixes with expected time savings
Expected Results
Based on typical findings:
- 30-50% faster incremental debug builds
- 5-10 seconds saved per build from conditional scripts
- Measurable improvements in Build Timeline
Prefer Natural Language?
Instead of using this command, you can simply say:
- "My builds are slow"
- "How can I speed up build times?"
- "Optimize my Xcode build performance"
- "Builds are taking forever"
The build-optimizer agent will automatically trigger.
Deep Dive
For comprehensive build analysis and optimization workflows, use:
/skill axiom:build-performance
This provides Build Timeline interpretation, type checking deep dive, and incremental vs clean build comparison.
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.
- 4d ago First seen · 45 lines · 27 tokens per session scan A 7234f987adaa
axiom-optimize-build is a command published in the GitHub repository CharlesWiltgen/Axiom (1,151 stars, last pushed yesterday), licensed MIT. It adds 27 tokens to every session and 273 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 2026-09-06.
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