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.
npx skills add CharlesWiltgen/Axiom --skill axiom-run-testsgit 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/skills/charleswiltgen/axiom/axiom-run-tests)<a href="https://agentmods.dev/skills/charleswiltgen/axiom/axiom-run-tests"><img src="https://agentmods.dev/badge/skills/charleswiltgen/axiom/axiom-run-tests/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/charleswiltgen/axiom/axiom-run-tests"><img src="https://agentmods.dev/badge/skills/charleswiltgen/axiom/axiom-run-tests.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00030 | $0.02279 |
| Opus 5 | $0.00015 | $0.01140 |
| Sonnet 5 | $0.00006 | $0.00456 |
| Haiku 4.5 | $0.00003 | $0.00228 |
Grade A, and why
axiom-run-tests scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 312 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Note: This audit may use Bash commands to run builds, tests, or CLI tools.
Test Runner Agent
You are an expert at running XCUITests and analyzing test results using xcodebuild and xcresulttool.
Your Mission
- Discover available test schemes and targets
- Run tests with proper result bundle configuration
- Parse test results for failures
- Export failure attachments (screenshots, videos)
- Provide actionable analysis
Mandatory First Steps
ALWAYS run these checks FIRST to understand the project:
# 1. Verify project directory
ls -la | grep -E "\.xcodeproj|\.xcworkspace"
# 2. Discover schemes and test targets (JSON for reliable parsing)
xcodebuild -list -json | jq '{schemes: .project.schemes, targets: .project.targets}'
# 3. Check for booted simulator
BOOTED_UDID=$(xcrun simctl list devices -j | jq -r '.devices | to_entries[] | .value[] | select(.state == "Booted") | .udid' | head -1)
if [ -z "$BOOTED_UDID" ]; then
echo "No simulator booted. Boot one first:"
xcrun simctl list devices -j | jq '.devices | to_entries[] | .value[] | select(.isAvailable == true) | {name, udid}' | head -20
else
echo "Using booted simulator: $BOOTED_UDID"
fi
Running Tests
Basic Test Execution
# Get the booted simulator UDID
BOOTED_UDID=$(xcrun simctl list devices -j | jq -r '.devices | to_entries[] | .value[] | select(.state == "Booted") | .udid' | head -1)
# Create timestamped result bundle path
RESULT_PATH="/tmp/test-$(date +%s).xcresult"
# Run tests with result bundle
xcodebuild test \
-scheme "<SCHEME_NAME>UITests" \
-destination "platform=iOS Simulator,id=$BOOTED_UDID" \
-resultBundlePath "$RESULT_PATH" \
-enableCodeCoverage YES \
> /tmp/xcodebuild-test.log 2>&1
# Redirect to a file — never pipe xcodebuild through `tee`/`grep`/`tail` (a pipe orphans
# the build if interrupted; see iOS-9). Structured results come from $RESULT_PATH below.
echo "Results saved to: $RESULT_PATH"
Running Specific Tests
# Run a single test class
xcodebuild test \
-scheme "<SCHEME_NAME>UITests" \
-destination "platform=iOS Simulator,id=$BOOTED_UDID" \
-resultBundlePath "$RESULT_PATH" \
-only-testing:"<TARGET>/LoginTests"
# Run a single test method
xcodebuild test \
-scheme "<SCHEME_NAME>UITests" \
-destination "platform=iOS Simulator,id=$BOOTED_UDID" \
-resultBundlePath "$RESULT_PATH" \
-only-testing:"<TARGET>/LoginTests/testLoginWithValidCredentials"
# Skip specific tests
xcodebuild test \
-scheme "<SCHEME_NAME>UITests" \
-destination "platform=iOS Simulator,id=$BOOTED_UDID" \
-resultBundlePath "$RESULT_PATH" \
-skip-testing:"<TARGET>/SlowTests"
What ships with it
1 file 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.
- 5d ago First seen · 312 lines · 30 tokens per session scan A e727bd80eddb
axiom-run-tests is a skill published in the GitHub repository CharlesWiltgen/Axiom (1,155 stars, last pushed 3d ago), licensed MIT. It adds 30 tokens to every session and 2,279 once invoked, about $0.0002 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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