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dotnet-legacy-aspnet

dotnet-legacy-aspnet is a skill for Claude Code, Codex from Postpartum-genushyacinthus29/dotnet-skills. It costs 36 tokens per session (397 once invoked), scanned A, original, MIT.

Guidance for maintaining classic ASP.NET applications built on the older .NET Framework, including Web Forms, older MVC, and IIS-based hosting. It also covers planning a gradual move to ASP.NET Core.

In plain words
What is it for?
Use it to troubleshoot and maintain Web Forms or legacy MVC apps, check IIS and configuration behavior, and plan modernization in manageable parts.
Why use it?
It helps avoid applying newer ASP.NET Core advice to an older application with different hosting, configuration, and request-lifecycle rules. It supports safer changes without breaking existing business behavior.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 10repo +1 2d ago A scan 36 tokens original MIT

Good fit Use it to troubleshoot and maintain Web Forms or legacy MVC apps, check IIS and configuration behavior, and plan modernization in manageable parts.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet
View source ↗ Postpartum-genushyacinthus29/dotnet-skills
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 Postpartum-genushyacinthus29/dotnet-skills --skill dotnet-legacy-aspnet
Clone the repo
git clone --depth 1 https://github.com/Postpartum-genushyacinthus29/dotnet-skills

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 dotnet-legacy-aspnet

README.md
[![agentmods](https://agentmods.dev/badge/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet/github.svg)](https://agentmods.dev/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet)
Your own site
<a href="https://agentmods.dev/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet"><img src="https://agentmods.dev/badge/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet/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 dotnet-legacy-aspnet

Your own site · 80×15
<a href="https://agentmods.dev/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet"><img src="https://agentmods.dev/badge/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-legacy-aspnet.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 397 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 $0.00036 $0.00397
Opus 5 $0.00018 $0.00198
Sonnet 5 $0.00007 $0.00079
Haiku 4.5 $0.00004 $0.00040

Measured 12d ago against content hash d19cc135ce31, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

dotnet-legacy-aspnet 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.

skills/dotnet-legacy-aspnet/SKILL.md · 42 lines

What it actually says

Legacy ASP.NET

Trigger On

  • working in Web Forms, legacy MVC, or classic ASP.NET applications
  • reviewing old IIS-centric configuration and lifecycle behavior
  • planning migration toward ASP.NET Core without breaking core business flows

Workflow

  1. Treat classic ASP.NET as a distinct stack with different hosting, lifecycle, and configuration rules from ASP.NET Core.
  2. Stabilize behavior first: routing, session, auth, server controls, configuration transforms, and deployment assumptions.
  3. Plan modernization in seams: isolate domain and service logic, then move replaceable edges instead of rewriting the whole app at once.
  4. Use dotnet-wcf or dotnet-entity-framework6 when the legacy app depends on those subsystems rather than flattening them into generic web work.
  5. Be careful with guidance copied from ASP.NET Core because middleware, DI, and hosting assumptions do not transfer directly.
  6. Validate in an environment that resembles real IIS and configuration transforms.

Deliver

  • practical maintenance guidance for classic ASP.NET
  • stabilized legacy behavior and modernization seams
  • a migration path that avoids unnecessary risk

Validate

  • classic and Core guidance are not mixed
  • legacy runtime assumptions are preserved deliberately
  • migration steps are incremental and testable

References

  • Migration Paths: strategies for migrating from ASP.NET to ASP.NET Core, including incremental migration, strangler fig pattern, and component-specific guidance
  • Maintenance Patterns: stabilization and maintenance patterns for legacy ASP.NET code, including abstraction layers, testing seams, and deployment practices
Files

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.

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. 12d ago First seen · 42 lines · 36 tokens per session scan A d19cc135ce31

Subscribe to this mod's changes

dotnet-legacy-aspnet is a skill published in the GitHub repository Postpartum-genushyacinthus29/dotnet-skills (10 stars, last pushed 2d ago), licensed MIT. It adds 36 tokens to every session and 397 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.

Backend and APIsC# and .NETLanguagesLegacyagent-skillsai-agentsalexa-skills-sdkaws-lambdaazure-openaicode-analysis-true
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