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.
/plugin marketplace add AvdLee/Core-Data-Agent-Skillnpx agentmods add plugins/avdlee/core-data-agent-skill/marketplacegit clone --depth 1 https://github.com/AvdLee/Core-Data-Agent-SkillGrade A, and why
core-data-agent-skill 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 2d 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
{
"$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
"name": "core-data-agent-skill",
"version": "1.0.0",
"owner": {
"name": "Antoine van der Lee",
"email": "[email protected]"
},
"metadata": {
"description": "Expert guidance on Core Data: persistence, data modeling, threading, performance optimization, and CloudKit integration."
},
"plugins": [
{
"name": "core-data-expert",
"description": "Expert guidance on Core Data persistence, data modeling, and performance. Covers NSPersistentContainer, fetch optimization, threading with NSManagedObjectID, batch operations, schema migration, and NSPersistentCloudKitContainer integration.",
"repository": "https://github.com/AvdLee/Core-Data-Agent-Skill",
"version": "1.0.0",
"author": {
"name": "Antoine van der Lee",
"email": "[email protected]"
},
"license": "MIT",
"category": "development",
"keywords": [
"core-data",
"coredata",
"persistence",
"database",
"sqlite",
"cloudkit",
"nspersistentcontainer",
"nsmanagedobject",
"fetch-requests",
"threading",
"migration",
"ios",
"macos",
"swift",
"apple"
],
"tags": [
"core-data",
"persistence",
"database",
"cloudkit",
"ios",
"macos",
"swift",
"apple-platforms"
],
"source": "./"
}
]
}
What ships with it
1 file beside marketplace.json 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.
- 2d ago First seen · 55 lines scan A 03e66e1ba386
core-data-agent-skill is a plugin published in the GitHub repository AvdLee/Core-Data-Agent-Skill (302 stars, last pushed 25d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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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