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-data-sourcesgit 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-data-sources)<a href="https://agentmods.dev/skills/crestapps/crestapps.agentskills/crestapps-core-data-sources"><img src="https://agentmods.dev/badge/skills/crestapps/crestapps.agentskills/crestapps-core-data-sources/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-data-sources"><img src="https://agentmods.dev/badge/skills/crestapps/crestapps.agentskills/crestapps-core-data-sources.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 | $0.00159 | $0.02349 |
| Opus 5.5 | $0.00064 | $0.00940 |
| Sonnet 5.5 | $0.00032 | $0.00470 |
| Haiku 4.5 | $0.00016 | $0.00235 |
Grade A, and why
crestapps-core-data-sources 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 — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CrestApps.Core Data Sources
An AIDataSource connects a source (where raw documents come from) to a knowledge base (a vector index profile holding chunked, embedded rows). AI profiles and chat interactions attach a data source for preemptive RAG and the search_data_sources tool, and tool instances can expose several data sources side by side.
Pick a backend skill for the vector store: crestapps-core-elasticsearch, crestapps-core-azure-ai-search or crestapps-core-postgresql. For uploads see crestapps-core-document-processing. For the record types that fill Web and File data sources see crestapps-core-web-crawlers and crestapps-core-file-sources.
Source Types
AIDataSourceSourceTypes (namespace CrestApps.Core.AI.Models):
| Constant | Reads | Kept in step by |
|---|---|---|
SearchIndexProfile |
a CrestApps-managed source index profile | automatic, when writes go through ISearchDocumentManager |
Elasticsearch |
an external Elasticsearch index with per-data-source credentials | IAIDataSourceChangeNotifier |
AzureAISearch |
an external Azure AI Search index | IAIDataSourceChangeNotifier |
PostgreSQL |
an external PostgreSQL table | IAIDataSourceChangeNotifier |
Web |
pages from web crawler records (AddCoreWebCrawlers()) |
scheduled re-crawl |
File |
typed knowledge objects from file source records (AddCoreFileSources()) |
scheduled runs |
AIDataSource stores Source, AIKnowledgeBaseIndexProfileName, SourceIndexProfileName and the field mapping KeyFieldName, TitleFieldName, ContentFieldName. Web and File data sources need no field mapping because every row already carries its key, title and content. Source credentials go on AIDataSource.Properties, protected with AIDataSourceProtectionConstants.SourceSecretPurpose.
Registration
builder.Services.AddCrestAppsCore(crestApps => crestApps
.AddAISuite(ai => ai
.AddOpenAI()
.AddChatInteractions(chatInteractions => chatInteractions
.AddYesSqlStores())
.AddToolInstances(toolInstances => toolInstances
.AddDataSourceSearchSource()
.AddYesSqlStores()))
.AddIndexingServices(indexing => indexing
.AddYesSqlStores()
.AddPostgreSQL(
builder.Configuration.GetSection("CrestApps:PostgreSQL"),
postgreSQL => postgreSQL.AddAIDataSources())));
builder.Services.AddCoreAIDataSourceStoresYesSql(); // or AddCoreAIDataSourceStoresEntityCore()
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.
- yesterday Changed · +86 lines · +132 tokens per session 02d275d52d88
- 1mo ago First seen · 51 lines · 27 tokens per session scan A a708e418da47
crestapps-core-data-sources is a skill published in the GitHub repository CrestApps/CrestApps.AgentSkills (13 stars, last pushed yesterday), licensed MIT. It adds 159 tokens to every session and 2,349 once invoked, about $0.0006 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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