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 PracticalSwan/agent-skills --skill sql-developmentgit clone --depth 1 https://github.com/PracticalSwan/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/practicalswan/agent-skills/sql-development)<a href="https://agentmods.dev/skills/practicalswan/agent-skills/sql-development"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/sql-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.
<a href="https://agentmods.dev/skills/practicalswan/agent-skills/sql-development"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/sql-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 200 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 | $0.00047 | $0.01869 |
| Opus 5.5 | $0.00019 | $0.00748 |
| Sonnet 5.5 | $0.00009 | $0.00374 |
| Haiku 4.5 | $0.00005 | $0.00187 |
Grade A, and why
sql-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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SQL Development
Optimized for current PostgreSQL, MySQL, and SQL Server releases plus migration-first database workflows.
Comprehensive SQL development guidelines combining SQL coding standards, stored procedure generation, and MS SQL Server DBA best practices.
- Leverage native parallel subagent dispatch and 200k+ context windows where available.
Cross-Client Portability
This skill is written to stay usable across GitHub Copilot, Claude Code, and Codex.
- GitHub Copilot: keep the folder in a Copilot-visible skill path or wrap the workflow in project instructions when folder discovery is unavailable.
- Claude Code: keep the folder in a local skills directory or a compatible plugin source.
- Codex: install or sync the folder into
$CODEX_HOME/skills/sql-developmentand restart Codex after major changes.
MCP Availability And Fallback
Preferred MCP Server: None required
- Fallback prompt: "Use the SQL Development skill without MCP. Rely on its local instructions, bundled resources, standard shell or editor tools, and direct verification. Show the evidence used before concluding."
- Do not claim an MCP operation was used when the active host does not expose it.
- Treat local files, tests, rendered outputs, logs, or screenshots as the fallback evidence path.
Anti-Patterns
- Using
SELECT *in production queries: It hides contract drift and pulls more data than the caller needs. - Writing non-SARGable predicates: Functions on indexed columns turn otherwise cheap queries into table scans.
- Ignoring transaction and lock behavior: Correct SQL needs both logical correctness and concurrency safety.
Verification Protocol
Before claiming "skill applied successfully":
- Pass/fail: The SQL Development implementation names the target runtime, framework version, and affected files.
- Pass/fail: Build, lint, test, or equivalent local validation is run for the changed surface.
- Pass/fail: Edge cases for errors, dependency drift, and environment differences are addressed or explicitly out of scope.
- Pressure-test scenario: Apply the workflow to a change that passes happy-path tests but fails one boundary condition.
- Success metric: Zero untested success claims; every implementation claim maps to a command or artifact.
What ships with it
8 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.
- 1mo ago Changed · -1 lines ae99ca137a99
- 1mo ago Changed 4ef8f4990bd4
- 1mo ago First seen · 231 lines · 47 tokens per session scan A 369e10f58216
sql-development is a skill published in the GitHub repository PracticalSwan/agent-skills (21 stars, last pushed 4d ago), licensed MIT. It adds 47 tokens to every session and 1,869 once invoked, about $0.0002 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 2026-09-03.
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