cs8794-fix
Remediates CS8794 diagnostics by removing tautological type patterns and preserving intent.
Source facts
- Repository
- visionarycoder/vc.Ifx
- Last source activity
- September 10, 2026 at 04:35
- Detected SKILL.md language
- English
- Stars
- 0
- Forks
- 0
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Source instructions · Read-only preview- name
- cs8794-fix
- description
- Remediates CS8794 diagnostics by removing tautological type patterns and preserving intent.
- title
- CS8794 Fix
- doc_type
- skill
- status
- active
- last_updated
- 2026-07-29T00:00:00.000Z
- target_audience
- ai
- complexity
- low
- estimated_tokens
- 760
- prerequisites
- ["ste-agent-writing-standard","terminology-dictionary"]
- related_skills
- ["property-patterns"]
- appliesTo
- **/*.{cs,csproj}
- tags
- ["csharp","diagnostics","cs8794","ste"]
# CS8794 Fix
This skill removes tautological type patterns that always match the static type.
This skill preserves behavior while simplifying pattern logic.
## Pattern Table
| Intent | Avoid | Preferred |
|---|---|---|
| Bind existing string | `if (value is string s)` when `value` is already `string` | `var s = value;` or direct use |
| Switch on known type | `value switch { string s => F(s) }` when `value` is `string` | `F(value)` |
| Guard null only | `if (value is string s)` for nullable string | `if (value is not null)` then use `value` |
## Workflow
| Step | Agent action | Output |
|---|---|---|
| 1. Locate | Agent finds each CS8794 diagnostic site. | Diagnostic list |
| 2. Verify | Agent checks the static type and the real branch intent. | Safe rewrite plan |
| 3. Rewrite | Agent replaces tautological patterns with direct use, null checks, or meaningful patterns. | Updated source |
| 4. Validate | Agent rebuilds the affected project. | Diagnostic-free result |
## Quality Gate
| Check | Test | Pass criteria |
|---|---|---|
| Diagnostic removal | Run `dotnet build` on the affected project. | Zero CS8794 diagnostics remain in changed scope. |
| Behavior preservation | Review the rewritten branch semantics. | Logic matches the original intent. |
| Pattern necessity | Review retained patterns. | Every retained pattern performs real runtime narrowing or shape testing. |
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