db-migration-unsigned

db-migration-unsigned is a skill for Claude Code, Codex from Cantara/kcp-agent. It costs 58 tokens per session (314 once invoked), scanned A, original, no licence file.

A deliberately invalid database-migration playbook whose manifest signature cannot be verified. A database migration changes the structure or data rules of a database.

In plain words
What is it for?
Use it only as a demonstration or test case for signature verification and refusal of untrusted migration instructions.
Why use it?
It demonstrates that an agent should fail closed: when the signature is missing or altered, the playbook must not run.

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/cantara/kcp-agent/db-migration-unsigned
Any agent
npx skills add Cantara/kcp-agent --skill db-migration-unsigned
Clone the repo
git clone --depth 1 https://github.com/Cantara/kcp-agent

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 db-migration-unsigned

README.md
[![agentmods](https://agentmods.dev/badge/skills/cantara/kcp-agent/db-migration-unsigned.svg)](https://agentmods.dev/skills/cantara/kcp-agent/db-migration-unsigned)
Your own site
<a href="https://agentmods.dev/skills/cantara/kcp-agent/db-migration-unsigned"><img src="https://agentmods.dev/badge/skills/cantara/kcp-agent/db-migration-unsigned.svg" alt="Measured on agentmods" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 314 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 $0.00058 $0.00314
Opus 5 $0.00029 $0.00157
Sonnet 5 $0.00012 $0.00063
Haiku 4.5 $0.00006 $0.00031

Measured 4d ago against content hash dc527c779de1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

db-migration-unsigned 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 4d 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.

examples/governed-skills/db-migration-unsigned/SKILL.md · 26 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

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. 4d ago First seen · 26 lines · 58 tokens per session scan A dc527c779de1

Subscribe to this mod's changes

db-migration-unsigned is a skill published in the GitHub repository Cantara/kcp-agent (0 stars, last pushed 4d ago), with no licence file. It adds 58 tokens to every session and 314 once invoked, about $0.0003 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.

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