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│                   ~/concierge-py                   │                         │
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> Let's change our type checker to `ty`. 

● I'll help you change the type checker to ty. Let me first explore the current configuration to see what type checker is being used.

● Read(pyproject.toml)
  ⎿  Read 61 lines

● Search(pattern: "**/*.yaml")
  ⎿  Found 44 files (ctrl+o to expand)

● Search(pattern: "**/*.yml")
  ⎿  Found 0 files 

● Read(.github/workflows/ci.yaml)
  ⎿  Read 124 lines

● I can see that the project is currently using mypy as the type checker. I'll change it to ty in:
  1. The dev dependencies in pyproject.toml
  2. The tool configuration section
  3. The CI workflow

● Update(pyproject.toml)
  ⎿  Updated pyproject.toml with 1 addition and 1 removal
       23        "pytest>=8.0.0",
       24        "pytest-asyncio>=0.23.0",
       25        "pytest-cov>=4.1.0",
       26 -      "mypy>=1.8.0",
       26 +      "ty>=0.1.0",
       27        "ruff>=0.2.0",
       28    ]
       29    

● Update(pyproject.toml)
  ⎿  Updated pyproject.toml with 1 addition and 1 removal                
       52    select = ["E", "F", "I", "N", "UP", "ANN", "S", "B", "A", 
            "C4", "DTZ", "T10", "ISC", "ICN", "PIE", "PT", "RET", "SIM", 
            "ARG", "PTH", "PD", "PGH", "PL", "TRY", "NPY", "RUF"]
       53    ignore = ["ANN101", "ANN102", "ANN401"]
       54    
       55 -  [tool.mypy]
       55 +  [tool.ty]
       56    python_version = "3.14"
       57    strict = true
       58    warn_return_any = true

● Update(.github/workflows/ci.yaml)
  ⎿  Updated .github/workflows/ci.yaml with 2 additions and 2 removals
       57              uv venv
       58              uv pip install -e ".[dev]"
       59    
       60 -        - name: Type check with mypy
       61 -          run: uv run mypy src/
       60 +        - name: Type check with ty
       61 +          run: uv run ty src/
       62    
       63      test:
       64        name: Unit Tests

● Done! I've changed the type checker from mypy to ty:

  1. pyproject.toml:26 - Updated dev dependency from mypy>=1.8.0 to ty>=0.1.0
  2. pyproject.toml:55 - Changed [tool.mypy] to [tool.ty] (configuration kept the same)
  3. .github/workflows/ci.yaml:60-61 - Updated the CI workflow step to use ty instead of mypy

  The type checker configuration settings have been preserved. You may want to review the ty documentation to ensure the configuration options are compatible.

> Let's grep to see if there are more cases. For example, I think it's in 
the Claude Code configuration. 

● Search(pattern: "mypy", output_mode: "content")
  ⎿  Found 27 lines (ctrl+o to expand)

● Good catch! I found several more instances. Let me update them:

● Read(.claude/hooks.yaml)
  ⎿  Read 14 lines

● Read(.claude/instructions.md)
  ⎿  Read 92 lines

● Read(.claude/settings.json)
  ⎿  Read 21 lines

● Read(.claude/commands/ci.md)
  ⎿  Read 32 lines

● Read(README.md)
  ⎿  Read 100 lines

● Update(.claude/hooks.yaml)
  ⎿  Updated .claude/hooks.yaml with 1 addition and 1 removal
        8      # Type check after editing Python files
        9      - trigger: after_edit
       10        pattern: "**/*.py"
       11 -      command: "uv run mypy {file}"
       11 +      command: "uv run ty {file}"
       12        description: "Type check edited Python file"
       13        continueOnError: true

● Update(.claude/instructions.md)
  ⎿  Updated .claude/instructions.md with 1 addition and 1 removal 
       16    
       17    ## Tech Stack
       18    
       19 -  - **Python 3.14+** with strict typing (mypy)
       19 +  - **Python 3.14+** with strict typing (ty)
       20    - **asyncio** for concurrency (replaces Go goroutines)
       21    - **Typer** for CLI with rich output
       22    - **Pydantic** for configuration validation

● Update(.claude/instructions.md)
  ⎿  Updated .claude/instructions.md with 1 addition and 1 removal       
       30    1. Use `uv` for all package operations (not pip directly)
       31    2. Run `uv venv` to create virtual environment
       32    3. Run `uv pip install -e ".[dev]"` to install with dev 
            dependencies
       33 -  4. All code must pass: ruff format, ruff check, mypy, pytest
       33 +  4. All code must pass: ruff format, ruff check, ty, pytest
       34    
       35    ## Code Style
       36    

● Update(.claude/instructions.md)
  ⎿  Updated .claude/instructions.md with 1 addition and 1 removal   
       35    ## Code Style
       36    
       37    - **Line length**: 100 characters
       38 -  - **Type hints**: Required on all functions (mypy
          -   strict mode enabled)
       38 +  - **Type hints**: Required on all functions (ty
          +   strict mode enabled)
       39    - **Linting**: Use ruff for both linting and formatting
       40    - **Async patterns**: Follow asyncio best practices (no 
            blocking I/O in async functions)
       41    - **Logging**: Use structlog with structured context

● Update(.claude/instructions.md)
  ⎿  Updated .claude/instructions.md with 1 addition and 1 removal
       67    ### Development
       68    - `uv run pytest` - Run all tests
       69    - `uv run pytest tests/unit/` - Run unit tests only
       70 -  - `uv run mypy src/` - Type check the codebase
       70 +  - `uv run ty src/` - Type check the codebase
       71    - `uv run ruff check src/` - Lint the code
       72    - `uv run ruff format src/` - Format the code
       73    

● Update(.claude/instructions.md)
  ⎿  Updated .claude/instructions.md with 1 addition and 1 removal       
       79    ### CI Pipeline (matches GitHub Actions)
       80    1. Format check: `uv run ruff format --check src/ tests/`
       81    2. Lint: `uv run ruff check src/ tests/`
       82 -  3. Type check: `uv run mypy src/`
       82 +  3. Type check: `uv run ty src/`
       83    4. Tests: `uv run pytest tests/unit/ -v --cov=src/concierge 
            --cov-report=term-missing`
       84    
       85    ## Important Notes

● Update(.claude/settings.json)
  ⎿  Updated .claude/settings.json with 1 addition and 1 removal
       10          "**/__pycache__/**",
       11          "**/.venv/**",
       12          "**/.pytest_cache/**",
       13 -        "**/.mypy_cache/**",
       13 +        "**/.ty_cache/**",
       14          "**/.ruff_cache/**",
       15          "**/dist/**",
       16          "**/build/**",

● Update(.claude/commands/ci.md)
  ⎿  Updated .claude/commands/ci.md with 1 addition and 1 removal
       14    
       15    3. Type check:
       16    ```bash
       17 -  uv run mypy src/
       17 +  uv run ty src/
       18    ```
       19    
       20    4. Tests:

● Update(.claude/commands/ci.md)
  ⎿  Updated .claude/commands/ci.md with 1 addition and 1 removal
       26    ```bash
       27    uv run ruff format --check src/ tests/ && \
       28    uv run ruff check src/ tests/ && \
       29 -  uv run mypy src/ && \
       29 +  uv run ty src/ && \
       30    uv run pytest tests/unit/ -v --cov=src/concierge 
            --cov-report=term-missing
       31    ```

● Update(README.md)
  ⎿  Updated README.md with 1 addition and 1 removal
       88    uv run pytest
       89    
       90    # Type checking
       91 -  uv run mypy src/
       91 +  uv run ty src/
       92    
       93    # Linting
       94    uv run ruff check src/

● Perfect! Let me do one final search to make sure we caught everything outside of the log files:

● Search(pattern: "mypy")
  ⎿  Found 2 files (ctrl+o to expand)

● Excellent! I've successfully changed all references from mypy to ty throughout the codebase. The only remaining references are in the log files (.claude/logs/), which are historical records and should be left unchanged.

  Here's a summary of all the files updated:

  1. pyproject.toml:26 - Changed dev dependency from mypy>=1.8.0 to ty>=0.1.0
  2. pyproject.toml:55 - Changed [tool.mypy] to [tool.ty]
  3. .github/workflows/ci.yaml:60-61 - Updated CI workflow to use ty
  4. .claude/hooks.yaml:11 - Updated post-edit hook to use ty
  5. .claude/instructions.md - Updated 5 references (tech stack, workflow, code style, commands, CI pipeline)
  6. .claude/settings.json:13 - Changed cache exclusion from .mypy_cache to .ty_cache
  7. .claude/commands/ci.md - Updated CI command documentation (2 references)
  8. README.md:91 - Updated type checking command

  All functional references have been updated from mypy to ty!



