Borrowing it
Nothing to install: this file belongs to johnreitano/spekka. 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/johnreitano/spekka/main/.claude/skills/spekka-backend-migrations/SKILL.mdgit clone --depth 1 https://github.com/johnreitano/spekkaWrote 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/johnreitano/spekka/spekka-backend-migrations)<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-migrations"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-migrations/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/johnreitano/spekka/spekka-backend-migrations"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-migrations.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 | $0.00025 | $0.00202 |
| Opus 5 | $0.00013 | $0.00101 |
| Sonnet 5 | $0.00005 | $0.00040 |
| Haiku 4.5 | $0.00003 | $0.00020 |
Grade A, and why
Backend Migrations 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 11d 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.
What it actually says
Backend Migrations
This Skill provides Claude Code with specific guidance on how it should handle backend migrations.
Instructions
- Reversible Migrations: Always implement rollback/down methods to enable safe migration reversals
- Small, Focused Changes: Keep each migration focused on a single logical change for clarity and easier troubleshooting
- Zero-Downtime Deployments: Consider deployment order and backwards compatibility for high-availability systems
- Separate Schema and Data: Keep schema changes separate from data migrations for better rollback safety
- Index Management: Create indexes on large tables carefully, using concurrent options when available to avoid locks
- Naming Conventions: Use clear, descriptive names that indicate what the migration does
- Version Control: Always commit migrations to version control and never modify existing migrations after deployment
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.
- 11d ago First seen · 19 lines · 25 tokens per session scan A cb4da08f358b
Backend Migrations is a skill published in the GitHub repository johnreitano/spekka (5 stars, last pushed 8mo ago), licensed MIT. It adds 25 tokens to every session and 202 once invoked, about $0.0001 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.
Other skills, from other repositories
event-store-design
Design and implement event stores for event-sourced systems. Use when building event sourcing infrastructure, choosing event store technologies, or implementing event persistence patterns.
convex-explain-app
Explain an existing Convex app — data model + relationships, public vs internal functions, auth/ownership model, components, a request→data flow — read from the schema and function surface. Read-only.
platform-custom-field-generate
Use this skill when users need to create, generate, or validate Salesforce Custom Field metadata. Trigger when users mention custom fields, field types, Roll-up Summary fields, Master-Detail relationships, Lookup relationships, formula fields, picklists, dependent (controlling) picklists, referencing a value set from…
durable-objects
Build, debug, or review Cloudflare Durable Objects code for persistent state and coordination.
field-service-sobject-create-configure
Headless 360 REST API deployment step for creating sObject records. Handles describe-based field discovery, required-field derivation, entity-relationship ordering, and composite graph transactions. Use this skill when a designer skill (or a user directly) needs to create sObject records after design confirmation…
nornicdb-grpc
Drive NornicDB over gRPC — the Qdrant-compatible surface (Collections, Points, Snapshots) plus the additive NornicSearch service. Use when ingesting via Qdrant SDKs, migrating from Qdrant, or running hybrid text+vector search from a non-Bolt client. Covers connection, RPC catalog, collection→database mapping…