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.
npx agentmods add skills/hoatv2211/gamestudio-codexkit/save-data-schema-migrationnpx skills add hoatv2211/GameStudio-CodexKIT --skill save-data-schema-migrationgit clone --depth 1 https://github.com/hoatv2211/GameStudio-CodexKITWrote 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/hoatv2211/gamestudio-codexkit/save-data-schema-migration)<a href="https://agentmods.dev/skills/hoatv2211/gamestudio-codexkit/save-data-schema-migration"><img src="https://agentmods.dev/badge/skills/hoatv2211/gamestudio-codexkit/save-data-schema-migration.svg" alt="Measured on agentmods" 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 | $0.00036 | $0.00741 |
| Opus 5 | $0.00018 | $0.00370 |
| Sonnet 5 | $0.00007 | $0.00148 |
| Haiku 4.5 | $0.00004 | $0.00074 |
Grade A, and why
save-data-schema-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 6d 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 — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Save Data Schema Migration
Overview
Plan and test player-save migrations through an explicit version chain while preserving the original payload and refusing unknown or newer versions.
When to use
Use for save field renames, defaults, removals, version upgrades, backward compatibility, import migrations, or player-data format changes.
When NOT to use
Do not use for database schema migration, arbitrary config edits, or direct production player-save rewrites without a project runbook.
Required inputs and context discovery
Require current and target versions, migration chain, save authority, fixture set, backup scope, rollback method, compatibility window, reviewer, human approval, privacy constraints, and validation checks.
Safety and risk level
High-risk. Unknown versions, incomplete chains, missing backup, missing rollback, missing reviewer, live player data, or missing approval means BLOCKED.
Workflow
- Identify save authority, current version, target version, and supported compatibility range. Completion criterion: unknown or newer versions are BLOCKED.
- Review each one-version migration step for rename, default, removal, and data loss. Completion criterion: irreversible transformations are explicit.
- Preserve the original fixture and run migration on a copy. Completion criterion: fixture mutation cannot destroy rollback input.
- Validate migrated semantics and backward/forward compatibility expectations. Completion criterion: expected fields and values are asserted.
- Prepare exact backup, apply, rollback, reviewer, and approval evidence for real scope. Completion criterion: real player data remains untouched until authorized.
Evidence and output contract
Produce save-migration-plan.json with versions, migration hashes, fixture results, compatibility, rollback, reviewer, approval, verdict, and limitations.
Handoff contract
Record save authority, version chain, fixture paths, migration result, data-loss risks, backup/rollback, approval state, and next authorized action.
What ships with it
2 files 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.
- 6d ago First seen · 79 lines · 36 tokens per session scan A 7be862f3883d
save-data-schema-migration is a skill published in the GitHub repository hoatv2211/GameStudio-CodexKIT (3 stars, last pushed 3d ago), licensed MIT. It adds 36 tokens to every session and 741 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 2026-08-31.
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