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 skills add int2t05/engineering-skills --skill deprecation-migrationgit clone --depth 1 https://github.com/int2t05/engineering-skillsWrote 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/int2t05/engineering-skills/deprecation-migration)<a href="https://agentmods.dev/skills/int2t05/engineering-skills/deprecation-migration"><img src="https://agentmods.dev/badge/skills/int2t05/engineering-skills/deprecation-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/int2t05/engineering-skills/deprecation-migration"><img src="https://agentmods.dev/badge/skills/int2t05/engineering-skills/deprecation-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 | $0.00029 | $0.00286 |
| Opus 5.5 | $0.00012 | $0.00114 |
| Sonnet 5.5 | $0.00006 | $0.00057 |
| Haiku 4.5 | $0.00003 | $0.00029 |
Grade A, and why
deprecation-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 22d 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
Deprecation and Migration
When to use
- Replace dependencies, interfaces or data models with verified consumer handling.
Not for: refactoring for structural moves; architecture for replacement design.
Steps
-
Identify consumers, persistent data and target; read official current migration guidance.
-
Choose atomic internal migration or a bounded transition needed by real external consumers, with removal criteria.
-
Update consumers, schema, config and approved docs; check integrity, repetition and recovery without casts or suppression masking errors.
-
Remove old implementation after verified migration and run behavior checks; report unverified consumers and commit only on request.
Verify
- Required consumer and data behavior survives; transition logic has necessity and removal evidence.
References
- engineering-principles.md — shared decision boundaries, scope and verification.
- references/dependency-upgrade.md — changelog/migration-guide reading, breaking-change triage, branch-based upgrade, root-cause fix per break
- references/data-migration.md — moving data between systems: dual-write + backfill, CDC, cutover, verification, failure modes
What ships with it
3 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.
- 22d ago Changed · -106 lines · -49 tokens per session f1378a1ca1d5
- 2mo ago First seen · 139 lines · 78 tokens per session scan A 1aad218ece5f
deprecation-migration is a skill published in the GitHub repository int2t05/engineering-skills (3 stars, last pushed 23d ago), licensed MIT. It adds 29 tokens to every session and 286 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 2026-08-31.
deprecation-migration compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| deprecation-migrationint2t05/engineering-skills | Skill | 3 | 23d ago | MIT | A | 29 | Claude Code, Codex |
| flask-qualitymorodomi/dev-crew | Skill | 1 | 2d ago | MIT | A | 89 | Claude Code |
| ring:instrumenting-streaming-eventsLerianStudio/ring | Skill | 218 | 6d ago | Apache-2.0 | A | 102 | Cursor |
| documentationlgbarn/shipyard | Skill | 67 | 16d ago | MIT | A | 62 | Claude Code |
| python-servicesiliaal/whetstone | Skill | 35 | 2d ago | MIT | A | 48 | Claude Code, Codex |
| nodejs-backendiliaal/whetstone | Skill | 35 | 2d ago | MIT | A | 50 | Claude Code, Codex |
| adhdszarkans/multi | Skill | 24 | 3d ago | MIT | A | 124 | Claude Code |