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 nexus-substrate/nexus-agents --skill deprecation-and-migrationgit clone --depth 1 https://github.com/nexus-substrate/nexus-agentsWrote 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/nexus-substrate/nexus-agents/deprecation-and-migration)<a href="https://agentmods.dev/skills/nexus-substrate/nexus-agents/deprecation-and-migration"><img src="https://agentmods.dev/badge/skills/nexus-substrate/nexus-agents/deprecation-and-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/nexus-substrate/nexus-agents/deprecation-and-migration"><img src="https://agentmods.dev/badge/skills/nexus-substrate/nexus-agents/deprecation-and-migration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Prompt Injection · line 91 Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
- medium Prompt Injection · line 96 Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
- medium Excessive Agency · line 105 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00068 | $0.01832 |
| Opus 5 | $0.00034 | $0.00916 |
| Sonnet 5 | $0.00014 | $0.00366 |
| Haiku 4.5 | $0.00007 | $0.00183 |
Grade A, and why
deprecation-and-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 12d 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 — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Deprecation and Migration Skill
When to apply
- Retiring
@deprecated-marked APIs - Renaming public types, classes, or string-union members
- Removing v-gated cleanup work
- Splitting an over-large public API into focused modules
- Sunsetting a config option, env var, or CLI flag
Skip when:
- The deprecation marker is fresh (< 1 minor version of bake) — let consumers see the warning first
- No replacement exists yet — implement the replacement first, deprecate the old, then migrate
- The change is purely internal (no public-barrel exposure) — that's a refactor, not a migration
Pre-removal checklist (before opening the cleanup PR)
- Bake duration: the
@deprecatedmarker has been in at least one published release for ≥ 1 minor version. Multi-month bake is preferred for typed APIs. - Replacement is canonical: the replacement exists, has tests, and is the documented preferred path in
CLAUDE.md/docs/. - Migration recipe drafted: a one-block diff showing the before/after for the most common consumer use case.
- Reachability audited:
grep -rnfor the deprecated symbol outside the package; checksrc/exports/*.tsto know if it's truly public or internal-only. - Semver target picked: patch (internal-only or runtime-unchanged), minor (TypeScript-typed-only break), or major (runtime API break).
The four-step process
1. Inventory
List every surface touched by the removal — types, schemas, classes, function names, internal callers, public re-exports, test fixtures, doc references.
# Symbol reach
grep -rn "DeprecatedName" src/ --include="*.ts" | wc -l
# Public-barrel check
grep -rn "DeprecatedName" src/exports/*.ts src/index.ts
# Doc references
grep -rn "DeprecatedName" docs/ skills/
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.
- 12d ago First seen · 134 lines · 68 tokens per session scan A 1ac6be2ff1c4
deprecation-and-migration is a skill published in the GitHub repository nexus-substrate/nexus-agents (18 stars, last pushed yesterday), licensed MIT. It adds 68 tokens to every session and 1,832 once invoked, about $0.0003 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 2026-08-30.
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