exasol-virtual-schema-adapter-development

exasol-virtual-schema-adapter-development is a skill for Claude Code from exasol-labs/exasol-agent-skills. It costs 94 tokens per session (542 once invoked), scanned A, original, MIT.

A guide to building custom Exasol virtual schema adapters. A virtual schema lets Exasol query data in another system through an adapter without first copying all of it into Exasol.

In plain words
What is it for?
Use it to create JDBC-based adapters, document-file adapters, custom data-type mappings, query pushdown rules, adapter JARs, and validation or debugging setups.
Why use it?
It explains the development, packaging, installation, and debugging work needed when an existing adapter does not support a data source or SQL behavior.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the exasol plugin — 18 skills, 2 commands shipped together

Good fit Use it to create JDBC-based adapters, document-file adapters, custom data-type mappings, query pushdown rules, adapter JARs, and validation or debugging setups.

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Install with agentmods
npx agentmods add skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development
Install

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.

Any agent
npx skills add exasol-labs/exasol-agent-skills --skill exasol-virtual-schema-adapter-development
Clone the repo
git clone --depth 1 https://github.com/exasol-labs/exasol-agent-skills

Made for: Claude Code.

Or install exasol, the plugin that ships this one along with the rest of its 18 skills, 2 commands.

Wrote 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.

agentmods badge for exasol-virtual-schema-adapter-development

README.md
[![agentmods](https://agentmods.dev/badge/skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development/github.svg)](https://agentmods.dev/skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development)
Your own site
<a href="https://agentmods.dev/skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development"><img src="https://agentmods.dev/badge/skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development/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.

agentmods 80×15 button for exasol-virtual-schema-adapter-development

Your own site · 80×15
<a href="https://agentmods.dev/skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development"><img src="https://agentmods.dev/badge/skills/exasol-labs/exasol-agent-skills/exasol-virtual-schema-adapter-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 542 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00094 $0.00542
Opus 5 $0.00047 $0.00271
Sonnet 5 $0.00019 $0.00108
Haiku 4.5 $0.00009 $0.00054

Measured 8d ago against content hash 7ea0af2d9ce4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

exasol-virtual-schema-adapter-development 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 8d 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.

plugins/exasol/skills/exasol-virtual-schema-adapter-development/SKILL.md · 34 lines

How it starts

The opening of the file, as written. The whole thing — 34 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Exasol Virtual Schema Adapter Development Skill

Trigger when the user mentions build a custom virtual schema adapter, virtual-schema-common-jdbc, remote debugging for a virtual schema adapter, new SQL dialect adapter, source-specific JDBC dialect, custom document-file adapter implementation, custom adapter properties, pushdown capabilities, type mapping, metadata reader, or adapter JAR packaging.

Routing Algorithm

  1. Build or customize an adapter

    • Trigger phrases: custom adapter, build virtual schema adapter, new SQL dialect, source-specific JDBC dialect, custom document-file adapter, virtual-schema-common-jdbc, SqlDialect, AdapterFactory, VirtualSchemaAdapter, metadata reader
    • Load: references/adapter-development.md
  2. Design adapter behavior

    • Trigger phrases: custom adapter properties, pushdown capabilities, type mapping, identifier quoting, literal rendering, function pushdown, custom dialect tests, adapter integration tests
    • Load: references/adapter-development.md
  3. Install or update adapter artifacts

    • Trigger phrases: adapter JAR, driver JAR, BucketFS, JAVA ADAPTER SCRIPT, deploy adapter
    • Load: references/adapter-development.md
  4. Validate and debug adapter behavior

    • Trigger phrases: EXPLAIN VIRTUAL, connection validation, remote debugging for virtual schema adapters, pushdown debugging, adapter-side issue
    • Load: references/adapter-development.md

Notes

  • Use this skill when the work is about adapter code, packaging, installation, or adapter-side debugging.
  • Use exasol-jdbc-virtual-schemas or exasol-document-virtual-schemas when the user only needs to create, refresh, or query an existing virtual schema.
  • Use exasol-extension-catalog first when the user is still choosing which existing adapter family or maintained extension to use.
  • Use exasol-bucketfs if the task is specifically about generic BucketFS file management outside the adapter deployment flow.

Read the full file on GitHub · 34 lines

Files

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.

Changes

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.

  1. 8d ago Changed · +24 tokens per session 7ea0af2d9ce4
  2. 12d ago First seen · 34 lines · 70 tokens per session scan A dd0b6203f952

Subscribe to this mod's changes

exasol-virtual-schema-adapter-development is a skill published in the GitHub repository exasol-labs/exasol-agent-skills (10 stars, last pushed 7d ago), licensed MIT. It adds 94 tokens to every session and 542 once invoked, about $0.0005 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 2026-08-31.