What is migration-reviewer?

A database-migration review agent for checking Supabase changes before they are applied. A migration is a scripted change to a database's structure or rules.

Use it to review migrations for access-control rules, indexes, rollback plans, and policy coverage.

It can catch missing row-level security, missing foreign-key indexes, unsafe destructive changes, and policy gaps before they affect data or access.

How lbragile/TabMerger configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to lbragile/TabMerger. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/lbragile/TabMerger/main/.claude/agents/migration-reviewer.md

Clone the repo

git clone --depth 1 https://github.com/lbragile/TabMerger

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/lbragile/tabmerger/migration-reviewer/github.svg)](https://agentmods.dev/agents/lbragile/tabmerger/migration-reviewer)

Your own site

<a href="https://agentmods.dev/agents/lbragile/tabmerger/migration-reviewer"><img src="https://agentmods.dev/badge/agents/lbragile/tabmerger/migration-reviewer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/lbragile/tabmerger/migration-reviewer"><img src="https://agentmods.dev/badge/agents/lbragile/tabmerger/migration-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 727 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00037	$0.00727
Opus 5.5	$0.00015	$0.00291
Sonnet 5.5	$0.00007	$0.00145
Haiku 4.5	$0.00004	$0.00073

Measured yesterday against content hash 3472b57bbd58, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

migration-reviewer 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 yesterday.

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.

.claude/agents/migration-reviewer.md · 43 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.

yesterday First seen · 43 lines · 37 tokens per session scan A 3472b57bbd58

Subscribe to this mod's changes

migration-reviewer is an agent published in the GitHub repository lbragile/TabMerger (192 stars, last pushed today), with no licence file. It adds 37 tokens to every session and 727 once invoked, about $0.0001 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 2026-11-07.

Databases Security chrome-extension edge-extension firefox-extension tab-management

migration-reviewer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
migration-reviewerlbragile/TabMerger	Agent	192	today	none	A	37	Claude Code
MS-SQL Database Administratorgithub/awesome-copilot	Agent	41k	yesterday	MIT	A	18	Claude Code
core-data-auditorCharlesWiltgen/Axiom	Agent	1.3k	2d ago	MIT	A	28	Claude Code
lensjeremylongshore/tons-of-skills-marketplace	Agent	2.9k	yesterday	MIT	A	53	Claude Code
django-migrations-specialistAratKruglik/claude-sdlc	Agent	55	12d ago	MIT	A	85	Claude Code
database-architectaayushostwal/nexus	Agent	19	29d ago	MIT	A	96	Claude Code
schema-checkerluanpdd/kit-mcp	Agent	5	6d ago	MIT	A	57	Claude Code

TabMerger: Agent for Claude Code