Holdfast
The distributed-correctness lens: design or audit anything that spans machines. Use when the user designs or reviews RPC, queues, replication, consensus, sharding, fault tolerance, or distributed transactions — or asks whether a design is correct. Triggers on "is this retry safe / exactly-once / idempotency", "ordering / timestamps across servers", "is this replication safe / split-brain", "eventual vs strong consistency / CAP / CP vs AP / linearizability", "do we need consensus / Raft / Paxos / etcd / ZooKeeper", "how should I shard this / partition / shard key / consistent hashing / hot key / rebalancing", "is this fault-tolerant / failure model / graceful degradation / circuit breaker / bulkhead", "two-phase commit / 2PC / saga / compensating transaction", "distributed lock / fencing token", "leader election", "should this even be distributed". The one shift: a remote call has a THIRD outcome — succeed, fail, OR leave you NOT KNOWING which — and the first law is don't distribute until you must.
Security AStatic scan found no risk patternsHow grading works ›
From the source SKILL.md
<!-- Copyright 2026 IamK77 — Licensed under the Apache License, Version 2.0. See ./LICENSE and ./NOTICE · https://www.apache.org/licenses/LICENSE-2.0 -->
What this skill does
Holdfast is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/holdfast/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when the user designs or reviews RPC, queues, replication, consensus, sharding, fault tolerance, or distributed transactions — or asks whether a design is correct. Triggers on "is this retry safe / exactly-once / idempotency", "ordering / timestamps across servers", "is this replication safe / split-brain", "eventual vs strong consistency / CAP / CP vs AP / linearizability", "do we need consensus / Raft / Paxos / etcd / ZooKeeper", "how should I shard this / partition / shard key / consistent hashing / hot key / rebalancing", "is this fault-tolerant / failure model / graceful degradation / circuit breaker / bulkhead", "two-phase commit / 2PC / saga / compensating transaction", "distributed lock / fencing token", "leader election", "should this even be distributed".
Who uses this skill
The Holdfast Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ 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/holdfast
curl -L https://claudskills.com/skills/holdfast/SKILL.md \
-o ~/.claude/skills/holdfast/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/holdfast/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/holdfast/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\holdfast\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 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.
Frequently asked questions
How do I install the Holdfast Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/holdfast/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Holdfast skill do?
The distributed-correctness lens: design or audit anything that spans machines. Use when the user designs or reviews RPC, queues, replication, consensus, sharding, fault tolerance, or distributed transactions — or asks whether a design is correct. Triggers on "is this retry safe / exactly-once / idempotency", "ordering / timestamps across servers", "is this replication safe / split-brain", "eventual vs strong consistency / CAP / CP vs AP / linearizability", "do we need consensus / Raft / Paxos / etcd / ZooKeeper", "how should I shard this / partition / shard key / consistent hashing / hot key / rebalancing", "is this fault-tolerant / failure model / graceful degradation / circuit breaker / bulkhead", "two-phase commit / 2PC / saga / compensating transaction", "distributed lock / fencing token", "leader election", "should this even be distributed". The one shift: a remote call has a THIRD outcome — succeed, fail, OR leave you NOT KNOWING which — and the first law is don't distribute until you must.
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 Holdfast skill?
Use Holdfast when your Claude Code task falls under the General category — specifically in the general 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 Holdfast" or describe the task and let Claude pick). Browse related skills at
/category/general/.
What is a Claude Code skill and how does the Holdfast 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. Holdfast is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
IamK77. (2026). Holdfast [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/holdfast/
BibTeX
@misc{holdfast-2026,
author = {IamK77},
title = {Holdfast [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/holdfast/}
}Embed this skill
Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →
Badge
[](https://claudskills.com/skills/holdfast/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/holdfast.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/holdfast.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Holdfast"></iframe>
Security scan
Grade A · scanned 2026-09-28 — 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):
[](https://claudskills.com/skills/holdfast/#security)
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