mvcc

mvcc is a skill for Claude Code, Codex from kalamdb/KalamDB. It costs 46 tokens per session (306 once invoked), scanned A, original, no licence file.

A guide to multi-version concurrency control (MVCC), a database method that keeps record versions so transactions can read a consistent snapshot while changes are committed or discarded.

In plain words
What is it for?
Use it when working on snapshot reads, visibility rules, commits, aborts, tombstones, compaction, vacuuming, or transaction lifecycles in KalamDB.
Why use it?
It helps explain which version of each record a transaction can see and how old versions, deleted records, and transaction outcomes are handled.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/kalamdb/kalamdb/mvcc
Any agent
npx skills add kalamdb/KalamDB --skill mvcc
Clone the repo
git clone --depth 1 https://github.com/kalamdb/KalamDB

Made for: Claude Code, Codex.

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 mvcc

README.md
[![agentmods](https://agentmods.dev/badge/skills/kalamdb/kalamdb/mvcc.svg)](https://agentmods.dev/skills/kalamdb/kalamdb/mvcc)
Your own site
<a href="https://agentmods.dev/skills/kalamdb/kalamdb/mvcc"><img src="https://agentmods.dev/badge/skills/kalamdb/kalamdb/mvcc.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 306 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00046 $0.00306
Opus 5 $0.00023 $0.00153
Sonnet 5 $0.00009 $0.00061
Haiku 4.5 $0.00005 $0.00031

Measured 5d ago against content hash bef1181fcbef, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mvcc 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 5d 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.

.agents/skills/mvcc/SKILL.md · 29 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 5d ago First seen · 29 lines · 46 tokens per session scan A bef1181fcbef

Subscribe to this mod's changes

mvcc is a skill published in the GitHub repository kalamdb/KalamDB (50 stars, last pushed 6d ago), with no licence file. It adds 46 tokens to every session and 306 once invoked, about $0.0002 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 2026-08-30.

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