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 OpenLinkSoftware/ai-agent-skills --skill virtuoso-support-agentgit clone --depth 1 https://github.com/OpenLinkSoftware/ai-agent-skillsWrote 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/openlinksoftware/ai-agent-skills/virtuoso-support-agent)<a href="https://agentmods.dev/skills/openlinksoftware/ai-agent-skills/virtuoso-support-agent"><img src="https://agentmods.dev/badge/skills/openlinksoftware/ai-agent-skills/virtuoso-support-agent/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/openlinksoftware/ai-agent-skills/virtuoso-support-agent"><img src="https://agentmods.dev/badge/skills/openlinksoftware/ai-agent-skills/virtuoso-support-agent.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 | $0.00076 | $0.01935 |
| Opus 5 | $0.00038 | $0.00967 |
| Sonnet 5 | $0.00015 | $0.00387 |
| Haiku 4.5 | $0.00008 | $0.00194 |
Grade A, and why
virtuoso-support-agent scanned grade A with 1 finding 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 10d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
6. Direct `curl` as last resort (query execution only) How it starts
The opening of the file, as written. The whole thing — 232 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Virtuoso Support Agent Skill
When to Use This Skill
Use when users need:
- Technical support for Virtuoso Server
- RDF Views generation from RDBMS tables
- SPARQL/SQL/GraphQL query assistance
- Configuration and troubleshooting
- Performance optimization
- Security and access control
- Product information and licensing
⛔ PRE-BUILD CHECK: Before producing output, re-read the relevant workflow section above and re-read any checklists or verification gates defined in this skill. Confirm each checklist item before writing output. Build to pass — do not retro-fit. Apply the CLAUDE.md Anti-Drift Protocol: re-read spec section before build, gate-first validation, section-by-section delivery.
Target Instance Selection (CRITICAL)
Before any operation, confirm which Virtuoso instance:
Available Instances
- Demo - Test/sample data with Northwind database
- URIBurner - Production instance
- Localhost - Local Virtuoso instance (default port 8890; confirm host/port with user)
Workflow
- Ask first: "Which Virtuoso instance? Demo, URIBurner, or Localhost?"
- Remember selection throughout conversation
- Allow switching with confirmation
- For Localhost: confirm base URL (default
http://localhost:8890) before any operation
Tool Naming Convention
Format: {ServerName}:{ToolName}
Examples:
Demo:execute_spasql_queryURIBurner:sparqlQueryLocalhost:sparqlQuery
Available MCP Tools (25 Total)
All tools available on Demo, URIBurner, and Localhost servers with server prefix.
Tool Categories
Entity Discovery (4 tools)
sparql_list_entity_typessparql_list_entity_types_detailedsparql_list_entity_types_samplessparql_list_ontologies
Database Remote Objects (1 tool)
database_remote_datasources— VDB operations: list, connect, disconnect, link/attach, tables, unlink remote datasources
Database Schema Objects (1 tool)
database_schema_objects— Retrieve metadata for tables, views, procedures, and user-defined types
What ships with it
7 files 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.
- 10d ago First seen · 232 lines · 76 tokens per session scan A 5c9720021aee
virtuoso-support-agent is a skill published in the GitHub repository OpenLinkSoftware/ai-agent-skills (38 stars, last pushed yesterday), licensed MIT. It adds 76 tokens to every session and 1,935 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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