fsharp-iwsam-errors
Design F# error types as IWSAM leaves (interfaces with static abstract members) so each function declares only its own errors and the caller picks one edge…
Skill by TheAngryByrd
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Install
Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.
npx agentmarket install skill/theangrybyrd-fsharp-iwsam-errors
Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.
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About
Use cases: design
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Permissions
What this skill can do and what it asks for, from its SKILL.md and code. Checked Oct 25, 2026.
- Tools
- No tools found
- Secrets
- None asked for
- Install scripts
- None found
Network hosts it talks to 1
codeload.github.com· found in install command
Files it touches
~/.claude/skills/fsharp-iwsam-errors
What's inside
- Skill name
fsharp-iwsam-errors- Description
- Design F# error types as IWSAM leaves (interfaces with static abstract members) so each function declares only its own errors and the caller picks one edge type. Use when adding or composing Result error types across F# functions, when a nested error DU needs Result.mapError at every call, when a new error case must reach every handler, or when the user says IWSAM, error tree, or edge type.
- License
- unknown
- Compatibility
- Requires the .NET 10 SDK and PowerShell 7.2 or later. scripts/global.json selects .NET 10 because F# 8 can report FS0192 on IWSAM edge types. Scripts pull FsToolkit.ErrorHandling from NuGet.
- Instructions
- 78 lines in SKILL.md · view on GitHub
Before installing
- Ships executable scripts
Files (12)
- SKILL.md
- FINDINGS.md · references/
- SHAPES.md · references/
- Domain.fsx · scripts/
- Effects.fsx · scripts/
- Shapes.fsx · scripts/
- AddLeaf.fsx · scripts/breaks/
- BypassConstructor.fsx · scripts/breaks/
- Unresolved.fsx · scripts/breaks/
- WrongEdge.fsx · scripts/breaks/
- global.json · scripts/
- run.ps1 · scripts/
The license isn't open source, so the instructions aren't shown here. Read SKILL.md on GitHub
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Signals
- Stars
- 18
- Forks
- 1
- Open issues
- 5
- Last commit (this folder)
- Oct 8, 2026 (22 days ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- License unknown
- Repository
- github.com/TheAngryByrd/fsharp-skills
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
- Source
- GitHubgithub-graphql
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- 0.642score
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TheAngryByrd
Compose F# Task, Async, and ValueTask code with the correct semantics and builder (task, async, valueTask, cancellableTask, taskResult).
SkillAFreshness: A★ 18Claude Code +9 - 0.642score
fsharp-signature-files
TheAngryByrd
Add F# signature files (.fsi) that expose only the API that callers use, and hide type representations so callers must use constructor functions.
SkillAFreshness: A★ 18Claude Code +9 - 0.642score
fsharp-verify-api
TheAngryByrd
Check the real signature of a .NET or F# API before F# code uses it, so the build does not loop on FS0039, FS0001, FS0074, or FS0078.
SkillAFreshness: A★ 18Claude Code +9 - 0.642score
fsharp-env-capabilities
TheAngryByrd
Pass dependencies in F# as one generic env value whose capabilities are small IProvideX interfaces, so the compiler infers each function's dependency set and…
SkillAFreshness: A★ 18Claude Code +9 - 0.642score
fsharp-failure-paths
TheAngryByrd
Make failures in F# code explicit instead of crashing or hiding them.
SkillAFreshness: A★ 18Claude Code +9 - 0.642score
fsharp-idiom-review
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Review an F# change for C#-shaped code before you finish it.
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fsharp-iwsam-errors skill. Agent Mart. https://agentmart.dev/skills/theangrybyrd-fsharp-iwsam-errors (last updated 2026-10-24)