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 CrestApps/CrestApps.AgentSkills --skill crestapps-core-foundationsgit clone --depth 1 https://github.com/CrestApps/CrestApps.AgentSkillsWrote 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/crestapps/crestapps.agentskills/crestapps-core-foundations)<a href="https://agentmods.dev/skills/crestapps/crestapps.agentskills/crestapps-core-foundations"><img src="https://agentmods.dev/badge/skills/crestapps/crestapps.agentskills/crestapps-core-foundations/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/crestapps/crestapps.agentskills/crestapps-core-foundations"><img src="https://agentmods.dev/badge/skills/crestapps/crestapps.agentskills/crestapps-core-foundations.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 | $0.00178 | $0.02703 |
| Opus 5.5 | $0.00071 | $0.01081 |
| Sonnet 5.5 | $0.00036 | $0.00541 |
| Haiku 4.5 | $0.00018 | $0.00270 |
Grade A, and why
crestapps-core-foundations 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 yesterday.
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 — 209 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CrestApps.Core Foundations
You are a CrestApps.Core expert. Build on the framework contracts rather than on a specific store or provider.
Package Layering
| Layer | Package | Contents |
|---|---|---|
| Abstractions | CrestApps.Core.Abstractions |
ExtensibleEntity, CatalogItem, SourceCatalogEntry, INameAwareModel, ISourceAwareModel, IDisplayTextAwareModel, catalog and manager interfaces, handler contexts, QueryContext, PageResult<T>, IStoreCommitter, IUserAccessor, UniqueId, the feature builder classes |
| Core | CrestApps.Core |
AddCrestAppsCore(...), AddCoreServices(), AddCatalogManagers(), catalog managers, CatalogEntryHandlerBase<T>, multi-source catalogs, store-committer filters, ODataFilterValidator, UserAccessor, JSOptions, DataProtectionHelper |
| Infrastructure | CrestApps.Core.Infrastructure.Abstractions, CrestApps.Core.Infrastructure |
indexing contracts (ISearchIndexManager, IIndexProfileHandler), DataSourceConstants, DocumentIndexConstants, RedactedSecret, DictionaryExtensions |
| Utilities | CrestApps.Core.Support |
string, enum, date and JSON helpers |
AddCrestAppsCore(...) creates the root CrestAppsCoreBuilder and registers ExtensibleEntityJsonOptions plus the hosted service that applies them. AddIndexingServices(...) on the root creates CrestAppsIndexingBuilder. AddAISuite(...) creates CrestAppsAISuiteBuilder, which hosts the feature builders (CrestAppsChatInteractionsBuilder, CrestAppsDocumentProcessingBuilder, CrestAppsDocumentIngestionBuilder, CrestAppsAIMemoryBuilder, CrestAppsAIPersonasBuilder, CrestAppsAIToolInstancesBuilder, CrestAppsA2AClientBuilder, CrestAppsMcpClientBuilder, CrestAppsMcpServerBuilder). Every builder method maps to an IServiceCollection extension such as AddCoreAIServices(), so a host can still call the lower-level methods directly.
AddCoreServices() registers scoped IODataValidator (ODataFilterValidator), singleton IHttpContextAccessor and singleton IUserAccessor (UserAccessor). AddAISuite(...) calls it for you.
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.
- yesterday Changed · +160 lines · +154 tokens per session d8b95e0e0caf
- 1mo ago First seen · 49 lines · 24 tokens per session scan A a6f6de7ea5b0
crestapps-core-foundations is a skill published in the GitHub repository CrestApps/CrestApps.AgentSkills (13 stars, last pushed yesterday), licensed MIT. It adds 178 tokens to every session and 2,703 once invoked, about $0.0007 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.
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