legacy-modernizer

legacy-modernizer is a skill for Claude Code, Codex from PIXARTSeu/Synapse. It costs 69 tokens per session (1,244 once invoked), scanned A, original, no licence file.

A skill for planning gradual upgrades of old software systems. It maps dependencies, finds service boundaries, plans migrations, and designs API facades—interfaces that let new and old code work together.

In plain words
What is it for?
Use it to create migration roadmaps, map legacy dependencies, upgrade frameworks, separate services, and plan incremental replacement strategies.
Why use it?
It helps modernise aging code without requiring an all-at-once rewrite.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to create migration roadmaps, map legacy dependencies, upgrade frameworks, separate services, and plan incremental replacement strategies.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pixartseu/synapse/legacy-modernizer
Install

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.

Any agent
npx skills add PIXARTSeu/Synapse --skill legacy-modernizer
Clone the repo
git clone --depth 1 https://github.com/PIXARTSeu/Synapse

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for legacy-modernizer

README.md
[![agentmods](https://agentmods.dev/badge/skills/pixartseu/synapse/legacy-modernizer/github.svg)](https://agentmods.dev/skills/pixartseu/synapse/legacy-modernizer)
Your own site
<a href="https://agentmods.dev/skills/pixartseu/synapse/legacy-modernizer"><img src="https://agentmods.dev/badge/skills/pixartseu/synapse/legacy-modernizer/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.

agentmods 80×15 button for legacy-modernizer

Your own site · 80×15
<a href="https://agentmods.dev/skills/pixartseu/synapse/legacy-modernizer"><img src="https://agentmods.dev/badge/skills/pixartseu/synapse/legacy-modernizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,244 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00069 $0.01244
Opus 5 $0.00034 $0.00622
Sonnet 5 $0.00014 $0.00249
Haiku 4.5 $0.00007 $0.00124

Measured 9d ago against content hash cdef74f9bcfe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

legacy-modernizer scanned grade A with 1 finding 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 9d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

return self._new.fetch(order_id)
.agents/skills/legacy-modernizer/SKILL.md · 138 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

5 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.

Changes

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.

  1. 9d ago First seen · 138 lines · 69 tokens per session scan A cdef74f9bcfe

Subscribe to this mod's changes

legacy-modernizer is a skill published in the GitHub repository PIXARTSeu/Synapse (9 stars, last pushed 14d ago), with no licence file. It adds 69 tokens to every session and 1,244 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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