Borrowing it
Nothing to install: this file belongs to kaininx/PlainTab. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kaininx/PlainTab/main/.agents/skills/storage-migration/SKILL.mdgit clone --depth 1 https://github.com/kaininx/PlainTabWrote 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.
[](https://agentmods.dev/skills/kaininx/plaintab/storage-migration)<a href="https://agentmods.dev/skills/kaininx/plaintab/storage-migration"><img src="https://agentmods.dev/badge/skills/kaininx/plaintab/storage-migration/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.
<a href="https://agentmods.dev/skills/kaininx/plaintab/storage-migration"><img src="https://agentmods.dev/badge/skills/kaininx/plaintab/storage-migration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00063 | $0.00663 |
| Opus 5.5 | $0.00025 | $0.00265 |
| Sonnet 5.5 | $0.00013 | $0.00133 |
| Haiku 4.5 | $0.00006 | $0.00066 |
Grade A, and why
storage-migration 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PlainTab Storage Migration
Use this skill as a red-line checklist for storage changes. User data safety and jump-upgrade behavior matter more than implementation neatness.
First Reads
- Read
.claude/rules/00-core.md. - Read
.claude/rules/10-storage.md. - If wallpaper rendering, first paint, settings UI, language, search, or command palette storage is touched, read the matching rule file from
.claude/rules/README.md.
Version Rules
DB_VERSIONis only for IndexedDB structure: object stores, indexes, keyPath, or autoIncrement.LS_VERSION/ptab_schema_versionis for PlainTab application data semantics.- If an IndexedDB-only change affects key names, record shape, references, old data cleanup, or jump upgrades, bump
LS_VERSIONand add aWallpaperData.migrate()path. - Do not use IndexedDB version upgrades for application-level migration decisions.
- Pure discardable cache changes do not need
LS_VERSIONif missing or stale cache cannot be misread and does not require cleanup.
Migration Discipline
Before production edits, write or update a focused check in docs/ai-tasks/ and watch it fail for the missing migration behavior.
For each migration step:
- Detect from persisted data, not app release numbers. Prefer
ptab_schema_version, legacyptab_version, old key presence, and current model facts. - Make the step idempotent. A browser close midway must be safe to retry.
- Write large data first, then write references.
- Never write references to missing Blob records.
- Remove references before deleting large data.
- Mark migration complete only after required new data and cleanup succeed.
- Do not overwrite non-default data already created by a newer version.
- Keep runtime modules reading only the current schema after migration.
Cleanup Rules
- Delete obsolete localStorage keys after successful migration.
- Delete obsolete IndexedDB keys with targeted deletes. Do not delete the whole
PlainTabdatabase while current data uses the same store. - Avoid permanent top-level marker keys for one-off migrations. If cleanup truly needs an idempotent retry marker, keep it scoped to an existing owned model, document why persisted facts are insufficient, and include a cleanup/removal path.
- Keep old migration code for enough releases to support users who skip versions.
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.
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.
- 2mo ago First seen · 57 lines · 63 tokens per session scan A edc28c19d9fb
storage-migration is a skill published in the GitHub repository kaininx/PlainTab (96 stars, last pushed 5mo ago), licensed MIT. It adds 63 tokens to every session and 663 once invoked, about $0.0003 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 2026-08-30.
Other skills, from other repositories
create-pr
Creates a GitHub PR with a Linear-ticket-prefixed title and a decision-led, narrative description for Prisma 8. Use when the user wants to create a pull request, open a PR, or submit changes for review.
schema-exploration
Lists tables, describes columns and data types, identifies foreign key relationships, and maps entity relationships in a database. Use when the user asks about database schema, table structure, column types, what tables exist, ERD, foreign keys, or how entities relate.
atlas-mssql
SQL Server specifics for Atlas (also Azure SQL and MSSQL): login, dev database and URL scope (mode=schema vs mode=database, the database query parameter), compatibility level and collation, system-generated constraint names, clustered index defaults and datetime2 precision in HCL, GO batches and the delimiter…
ha-data-stores
Map of Hope Agent's local data stores and safe read-only query workflow. Use when the user asks where Hope Agent stores data, wants to inspect sessions/messages/memory/logs/background jobs/knowledge indexes/settings, asks the model to query local app data, or debugging requires checking persisted state. Trigger…
nornicdb-cypher-queries
Pick fast, predictable Cypher query shapes in NornicDB — point lookups, batch retrieval, pagination, search, traversal, batched UNWIND/MERGE writes, cleanup, multi-tenant isolation. Use when writing or reviewing Cypher whose latency or throughput matters; maps user intent to the executor's hot-path query templates.
volcengine-rds-postgresql
A tool for operating PostgreSQL databases hosted by Volcano Engine's managed database service. PostgreSQL is a relational database used to store structured application data.