semantic-pattern-authoring

A guide for adding small, isolated rewrites to a migration command-line tool after its main transformations finish.

In plain words
What is it for?
It helps rewrite query-bound pages, blank action pages, and similar migrated shapes using targeted patterns and focused tests.
Why use it?
It keeps recurring page-specific behavior out of the core conversion steps and preserves clear TODOs where the original application needs human decisions.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/fritzandfriends/blazorwebformscomponents/semantic-pattern-authoring
Any agent
npx skills add FritzAndFriends/BlazorWebFormsComponents --skill semantic-pattern-authoring
Clone the repo
git clone --depth 1 https://github.com/FritzAndFriends/BlazorWebFormsComponents

Made for: Claude Code, Codex.

Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 319 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00019 $0.00319
Opus 5 $0.00010 $0.00160
Sonnet 5 $0.00004 $0.00064
Haiku 4.5 $0.00002 $0.00032

Measured 3d ago against content hash c54f37d349f6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

semantic-pattern-authoring 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 3d 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.

.squad/skills/semantic-pattern-authoring/SKILL.md · 25 lines

What it actually says

Semantic Pattern Authoring

Use when

  • A recurring migrated page shape needs a post-transform rewrite.
  • The change should stay in src/BlazorWebFormsComponents.Cli/SemanticPatterns/.
  • You need targeted tests instead of broad pipeline edits.

Pattern

  1. Match on post-transform markup/code-behind, not original Web Forms syntax.
  2. Keep wrapper extraction and markup surgery in subsystem-local helpers.
  3. Preserve explicit TODO markers for app-specific behavior that the CLI cannot safely infer.
  4. Prefer compile-safe SSR output over preserving non-runnable validator/postback trees.
  5. Add isolated tests that assert both pattern IDs and rewritten markup shape.
  6. For query-bound data pages, prefer SelectMethodSelectItems scaffolds plus [SupplyParameterFromQuery] / [Parameter] component properties when the original Web Forms method relied on model-binding attributes.
  7. For blank action pages, generate an SSR handler scaffold (NavigationManager, query-bound properties, redirect target, OnParametersSet TODO) instead of leaving inert migrated HTML.

Current examples

  • pattern-query-details — rewrites query-string / route-data SelectMethod pages to query-bound SelectItems stubs with TODO(bwfc-query-details).
  • pattern-action-pages — rewrites action-only redirect pages to SSR handler scaffolds with TODO(bwfc-action-pages).
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. 3d ago First seen · 25 lines · 19 tokens per session scan A c54f37d349f6

Subscribe to this mod's changes

semantic-pattern-authoring is a skill published in the GitHub repository FritzAndFriends/BlazorWebFormsComponents (449 stars, last pushed 2mo ago), licensed MIT. It adds 19 tokens to every session and 319 once invoked, about $0.0001 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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