Pg Shadow Implement

Q: What is a Claude Code skill and how does the Pg Shadow Implement skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Pg Shadow Implement is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Product · Sub-category: product-misc · Last updated: 2026-07-10

Shadow-implement a pgsql-hackers thread to calibrate the pg-claude planner suite — read the COVER + discussion only (NOT the attached patch), produce a spec, run pg-feature-brainstorm / pg-feature-plan / pg-implement as-if the user asked for the feature, then fetch the upstream patch, diff against ours, score the gap, and emit comparison.md + skill-gaps.md. This is the "Phase E" calibration loop. Use when the user invokes `/pg-shadow <thread-url>`, says "shadow-implement that thread", "run Phase E against <thread>", "run a shadow against this hackers thread", or names a pgsql-hackers thread + asks how our planner would handle it. Do NOT trigger for real upstream patches we plan to send (use `pg-feature-plan` + `pg-implement` directly), for already-committed threads (re-implementing landed code is meaningless), or for non-PG calibration.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

This skill operationalizes knowledge/calibration/shadow-implementation-methodology.md as a runnable procedure. Each run produces calibration data about the planner suite's implementation accuracy, NOT a patch we plan to send upstream.

What this skill does

Pg Shadow Implement is a community-contributed Claude Code skill in the product-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/pg-shadow-implement/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user invokes `/pg-shadow <thread-url>`, says "shadow-implement that thread", "run Phase E against <thread>", "run a shadow against this hackers thread", or names a pgsql-hackers thread + asks how our planner would handle it. Do NOT trigger for real upstream patches we plan to send (use `pg-feature-plan` + `pg-implement` directly), for already-committed threads (re-implementing landed code is meaningless), or for non-PG calibration.

Who uses this skill

The Pg Shadow Implement Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/pg-shadow-implement
curl -L https://claudskills.com/skills/pg-shadow-implement/SKILL.md \
  -o ~/.claude/skills/pg-shadow-implement/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/pg-shadow-implement/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/pg-shadow-implement/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\pg-shadow-implement\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Pg Shadow Implement Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/pg-shadow-implement/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Pg Shadow Implement skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Pg Shadow Implement skill?

Use Pg Shadow Implement when your Claude Code task falls under the Product category — specifically in the product misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Pg Shadow Implement" or describe the task and let Claude pick). Browse related skills at /category/product/.

What is a Claude Code skill and how does the Pg Shadow Implement skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Pg Shadow Implement is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/matejformanek/postgres-claude/blob/HEAD/.claude/skills/pg-shadow-implement/SKILL.md
License: PostgreSQL
Author: matejformanek
Website: https://github.com/matejformanek/postgres-claude

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

matejformanek. (2026). Pg Shadow Implement [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/pg-shadow-implement/

BibTeX

@misc{pg-shadow-implement-2026,
  author    = {matejformanek},
  title     = {Pg Shadow Implement [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/pg-shadow-implement/}
}

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Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/pg-shadow-implement/#security)

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