Efcore Patterns

What it does

When your agent uses it

• Adding a table/entity
• A migration under apps/api

Example prompts

• “/efcore-patterns”

Requirements

• Pre-approved tools (allowed-tools): Read, Glob, Grep, Bash, 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

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

1. 1Classify — entity + EF config / repository (write side, per aggregate root) / query (read side,
2. 2Locate the feature slice — entity in {{ProjectName}}.Domain/; EF config + repo in
3. 3Generate (C# via Serena create_text_file / symbol edits — native .cs edits are blocked)
4. 4Migration — dotnet ef migrations add ; review the generated Postgres DDL; never edit an
5. 5Validate — dotnet build zero warnings; tests via the testing-expert per the plan.

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
  • Bash
  • 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

  …and 11 more on the same allowed-tools line.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • dotnet

  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

Efcore Patterns loads about 1k tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 350 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~60

When it runs · the whole SKILL.md, loaded when a task matches

~1k

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

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Read, Glob, Grep, Bash, mcp__serena__initial_instructions, mcp__serena__get_symbols_overview, mcp__s

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 350 words (~1,013 tokens).

name

efcore-patterns

allowed-tools

Read, Glob, Grep, Bash, 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

argument-hint

<entity or feature name>

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/efcore-patterns of atherio-danp/cde-dotnetcc.

Open the folder on GitHubat commit c72a3f9