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Agent skill

Result Pattern

by atherio-danp in atherio-danp/cde-dotnetcc

Implement or use our Result<T failure model in the .NET API — return Result from handlers, build Error values, compose with Map/Then/Match, catch domain exceptions into Result, and map Result→RFC…

No licenceAuto-check: notes

Install Result Pattern

skills CLI
$ npx skills add atherio-danp/cde-dotnetcc --skill result-pattern -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install atherio-danp/cde-dotnetcc result-pattern --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/atherio-danp/cde-dotnetcc.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/result-pattern .claude/skills/result-pattern && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
result-pattern
GitHub stars
109
Token cost
~947 tokens
SKILL.md length
320 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
None found

At a glance

Implement or use our Result<T failure model in the .NET API — return Result from handlers, build Error values, compose with Map/Then/Match, catch domain exceptions into Result, and map Result→RFC…

  • Works in 3 steps: Handlers return Result (or Result) for… → Catch domain exceptions — domain… → Compose with Then/Map to chain fallible…
  • Adding an operation that can fail
  • SKILL.md covers The types (in…, Using it and Boundaries (who lives where)
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Result Pattern is an agent skill from atherio-danp/cde-dotnetcc. Implement or use our Result<T failure model in the .NET API — return Result from handlers, build Error values, compose with Map/Then/Match, catch domain exceptions into Result, and map Result→RFC 9457 ProblemDetails. Use when adding an operation that can fail or wiring an endpoint's error contract.

Its SKILL.md is about 950 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with .NET. The repository describes itself as: Claude Code harness for .NET developers.

When your agent uses it

  • Adding an operation that can fail
  • Wiring an endpoints error contract

Example prompts

  • “/result-pattern”

Requirements

  • Pre-approved tools (allowed-tools): Read, Glob, Grep, Edit, Write, Bash, Skill, mcp__serena__initial_instructions, mcp__serena__get_symbols_overview, mcp__serena__find_symbol, mcp__serena__find_referencing_symbols, mcp__serena__find_declaration, mcp__serena__find_implementations, mcp__serena__search_for_pattern, mcp__serena__get_diagnostics_for_file, mcp__serena__list_dir, mcp__serena__find_file, mcp__serena__create_text_file, mcp__serena__replace_symbol_body, mcp__serena__insert_after_symbol, mcp__serena__insert_before_symbol, mcp__serena__replace_content, mcp__serena__rename_symbol, mcp__serena__safe_delete_symbol

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Handlers return Result (or Result) for expected failures — return dto; (implicit) on success,
  2. Catch domain exceptions — domain invariants throw; in the handler catch a narrow DomainException
  3. Compose with Then/Map to chain fallible steps without nesting; Match to collapse to a value/response.

What it can do on your machine

Read from SKILL.md and the folder at commit c72a3f9. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep
    • Edit
    • Write
    • Bash
    • Skill
    • mcp__serena__initial_instructions
    • mcp__serena__get_symbols_overview
    • mcp__serena__find_symbol

    …and 14 more on the same allowed-tools line.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Result Pattern loads about 947 tokens when it runs. Until then it costs about 79 tokens; SKILL.md has 320 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~79
When it runs · the whole SKILL.md, loaded when a task matches
~947

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Glob, Grep, Edit, Write, Bash, Skill, mcp__serena__initial_instructions, mcp__serena__get_symb

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 320 words (~947 tokens).

“The procedure for our hand-rolled, railway-oriented failure model. Source of truth (the facts — read it): .claude/rules/backend/result-and-errors.md and docs/projectStandards/backend-architecture.md §4.2–§4.3. C# (.cs) edits via Serena. No FP library (e.g. CSharpFunctionalExtensions) without Dan's approval.”

— opening of SKILL.md by atherio-danp
name
result-pattern
allowed-tools
Read, Glob, Grep, Edit, Write, Bash, Skill, mcp__serena__initial_instructions, mcp__serena__get_symbols_overview, mcp__serena__find_symbol, mcp__serena__find_referencing_symbols, mcp__serena__find_declaration, mcp__serena__find_implementations, mcp__serena__search_for_pattern, mcp__serena__get_diagnostics_for_file, mcp__serena__list_dir, mcp__serena__find_file, mcp__serena__create_text_file, mcp__serena__replace_symbol_body, mcp__serena__insert_after_symbol, mcp__serena__insert_before_symbol, mcp__serena__replace_content, mcp__serena__rename_symbol, mcp__serena__safe_delete_symbol

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/result-pattern of atherio-danp/cde-dotnetcc.

Open the folder on GitHubat commit c72a3f9

Compare with similar skills

Result Pattern next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Result Pattern compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Result Pattern this skillatherio-danp/cde-dotnetcc109—~947Automated safety check: NotesNone
Minimax DOCXpoco-ai/poco-claw1.4k7 repos~3.9kAutomated safety check: PassMIT
Microsoft Skill CreatorMicrosoftDocs/mcp1.9k3 repos~2.1kAutomated safety check: PassCC-BY-4.0
Speckit ConstitutionWeihanLi/WeihanLi.Common24211 repos~2.1kAutomated safety check: PassApache-2.0
Copilot Session Failure Analysisdotnet/maui23k—~3.4kAutomated safety check: PassMIT
Microsoft Code ReferenceMicrosoftDocs/mcp1.9k4 repos~1.1kAutomated safety check: PassCC-BY-4.0

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Works with

Questions about Result Pattern

What does Result Pattern do?

Implement or use our Result<T failure model in the .NET API — return Result from handlers, build Error values, compose with Map/Then/Match, catch domain exceptions into Result, and map Result→RFC…. Result Pattern is an agent skill from atherio-danp/cde-dotnetcc.NET API — return Result from handlers, build Error values, compose with Map/Then/Match, catch domain exceptions into Result, and map Result→RFC 9457 ProblemDetails.

When should I use Result Pattern?

Result Pattern fits situations like: adding an operation that can fail; wiring an endpoints error contract.

How do I install Result Pattern in Claude Code?

Run `npx skills add atherio-danp/cde-dotnetcc --skill result-pattern -a claude-code`. Or copy the skill folder (.claude/skills/result-pattern in atherio-danp/cde-dotnetcc) into .claude/skills/result-pattern in your project. Claude Code loads it when a task matches its description.

How do I install Result Pattern in Codex?

Run `npx skills add atherio-danp/cde-dotnetcc --skill result-pattern -a codex`. Or copy the skill folder (.claude/skills/result-pattern in atherio-danp/cde-dotnetcc) into .agents/skills/result-pattern in your project. Codex loads it when a task matches its description.

Can I use Result Pattern in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add atherio-danp/cde-dotnetcc --skill result-pattern -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/result-pattern, .gemini/skills/result-pattern, .github/skills/result-pattern and .opencode/skills/result-pattern in your project.

What does Result Pattern need to run?

SKILL.md names no scripts, command-line tools or credentials: Result Pattern is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep, Edit, Write, Bash, Skill, mcp__serena__initial_instructions, mcp__serena__get_symbols_overview, mcp__serena__find_symbol, mcp__serena__find_referencing_symbols, mcp__serena__find_declaration, mcp__serena__find_implementations, mcp__serena__search_for_pattern, mcp__serena__get_diagnostics_for_file, mcp__serena__list_dir, mcp__serena__find_file, mcp__serena__create_text_file, mcp__serena__replace_symbol_body, mcp__serena__insert_after_symbol, mcp__serena__insert_before_symbol, mcp__serena__replace_content, mcp__serena__rename_symbol, mcp__serena__safe_delete_symbol.

Does Result Pattern access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Result Pattern safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Result Pattern use?

No licence was found for Result Pattern or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Result Pattern use?

About 947 tokens (SKILL.md is roughly 3.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Result Pattern?

Skills that share tags, products or a category with Result Pattern: Minimax DOCX (poco-ai/poco-claw, 1.4k stars), Microsoft Skill Creator (MicrosoftDocs/mcp, 1.9k stars), Speckit Constitution (WeihanLi/WeihanLi.Common, 242 stars) and Copilot Session Failure Analysis (dotnet/maui, 23k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Result Pattern?

atherio-danp (a GitHub user) maintains it in atherio-danp/cde-dotnetcc, which has 109 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on July 26, 2026.

Source: atherio-danp/cde-dotnetcc on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.