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 # [PROJECT_NAME]
 [short description]
 ## Project structure
 ```
 src/
 tests/           # Mirrors src/ structure; conftest.py provides shared fixtures
 ```
 ## Common commands
 ```shell
 # Run application
 [Command to run the application]
 # Run tests
 pytest
 ```
 ## Architecture
 [Simple explanation of the global architecture]
 ## Collaboration rules
 ### RULE-01 — Development Process
 - Before writing any code, explain the available options and approaches.
 - Validate the chosen approach together before producing code.
 - All produced code must be testable (no untestable side effects, no hidden global state).
 ### RULE-02 — Collaboration
 - Ask questions to refine understanding or suggest alternative approaches.
 - Ask questions one at a time. Wait for the answer to be fully understood before asking the next one.
 - If multiple questions are needed, indicate the total upfront: "Question 1/5", "Question 2/5", etc.
 ### RULE-03 — Communication
 - Conversations may be in French or English depending on the language used.
 - All code, documentation, and comments must be in English exclusively.
 ### RULE-04 — Code Standards
 - Python 3.12+. Follow PEP 8 conventions.
 - Use Google-style or NumPy-style docstrings for functions, classes, and modules.
 - `snake_case` for functions/variables, `PascalCase` for classes, `UPPER_SNAKE_CASE` for constants.
 - Type hints on all function signatures (parameters and return types).
 - No emojis in code, comments, or docstrings.
 - Use `pathlib.Path` for all file path manipulations in new code.
 - Use the `logging` module (never `print()`).
 ### RULE-05 — Dependency Management
 - List all external dependencies required so they can be installed.
 - When possible, propose alternatives using only the Python standard library.
 - When a new dependency is needed, provide the exact `pip install` command and hand back to the user to run it.
 - Never run `pip install` autonomously.
 - Never modify `requirements.txt` directly — the user manages that file.
 ### RULE-10 — Running Tests
 - Do NOT run tests automatically. Always ask the user before running `pytest`.
 ### RULE-11 — Functional Specifications as Source of Truth
 - Feature specifications live in `docs/features/` (named `FEAT-NNN-<slug>.md`).
 - These specs are the authoritative source for expected behavior. In case of doubt between code and spec, the spec wins.
 - Do NOT read specs systematically. Consult them when: there is ambiguity about expected behavior, the user explicitly asks, or working on a feature not yet implemented.
 - When creating a new feature, propose a spec in `docs/features/` before implementation.
 ## Testing conventions
 - Tests use `pytest` with `pythonpath = "src tests"` (set in `pyproject.toml`).
 - `conftest.py` provides: `sheerka` (session-scoped), `context` (function-scoped), `user`, `next_id`.
 - Each test module gets its own ontology (pushed/reverted automatically by the `on_new_module` fixture).
 - `tests/helpers.py` provides: `get_concept()`, `get_metadata()`, `get_concepts()`, `get_evaluated_concept()`, `_rv()`, `_rvf()`, `_mt()`, `_ut()`, `NewOntology`.
 - `sheerka.initialize("mem://")` is used in tests (in-memory, no disk I/O).
 - Use `NewOntology(context)` context manager when a test needs concept isolation within a module.
@@ -0,0 +1,126 @@
 ---
 name: developer
 description: Developer Mode - for writing code, implementing features, fixing bugs in the Sheerka project. Use this when developing general features.
 disable-model-invocation: false
 ---
 > **Announce immediately:** Start your response with "**[Developer Mode activated]**" before doing anything else.
 # Developer Mode
 You are now in **Developer Mode** - the standard mode for writing code in the Sheerka project.
 ## Primary Objective
 Write production-quality code by:
 1. Exploring available options before implementation
 2. Validating approach with user
 3. Implementing only after approval
 4. Following strict code standards and patterns
 ## Development Rules (DEV)
 ### DEV-1: Options-First Development
 Before writing any code:
 1. **Explain available options first** - Present different approaches to solve the problem
 2. **Wait for validation** - Ensure mutual understanding of requirements before implementation
 3. **No code without approval** - Only proceed after explicit validation
 **Code must always be testable.**
 ### DEV-2: Question-Driven Collaboration
 **Ask questions to clarify understanding or suggest alternative approaches:**
 - Ask questions **one at a time**
 - Wait for complete answer before asking the next question
 - Indicate progress: "Question 1/5" if multiple questions are needed
 - Never assume - always clarify ambiguities
 ### DEV-3: Communication Standards
 **Conversations**: French or English (match user's language)
 **Code, documentation, comments**: English only
 ### DEV-4: Code Standards
 **Follow PEP 8** conventions strictly:
 - Variable and function names: `snake_case`
 - Explicit, descriptive naming
 - **No emojis in code**
 **Documentation**:
 - Use Google or NumPy docstring format
 - Document all public functions and classes
 - Include type hints where applicable
 ### DEV-5: Dependency Management
 **When introducing new dependencies:**
 - List all external dependencies explicitly
 - Propose alternatives using Python standard library when possible
 - Explain why each dependency is needed
 ### DEV-6: Unit Testing with pytest
 **Test naming patterns:**
 - Passing tests: `test_i_can_xxx` - Tests that should succeed
 - Failing tests: `test_i_cannot_xxx` - Edge cases that should raise errors/exceptions
 **Test structure:**
 - Use **functions**, not classes (unless inheritance is required)
 - Before writing tests, **list all planned tests with explanations**
 - Wait for validation before implementing tests
 **Example:**
 ```python
 def test_i_can_recognize_simple_concept(context):
    """Test that a simple concept is recognized from user input."""
    result = recognize_simple_concept(context, "hello")
    assert result.status
 def test_i_cannot_recognize_simple_concept_from_empty_input(context):
    """Test that empty input is not recognized as a simple concept."""
    result = recognize_simple_concept(context, "")
    assert not result.status
 ```
 ### DEV-7: File Management
 **Always specify the full file path** when adding or modifying files:
 ```
 Modifying: src/parsers/tokenizer.py
 Creating: tests/parsers/test_tokenizer.py
 ```
 ### DEV-8: Error Handling Protocol
 **When errors occur:**
 1. **Explain the problem clearly first**
 2. **Do not propose a fix immediately**
 3. **Wait for validation** that the diagnosis is correct
 4. Only then propose solutions
 ## Managing Rules
 To disable a specific rule, the user can say:
 - "Disable DEV-4" (do not apply code standards rule)
 - "Enable DEV-4" (re-enable a previously disabled rule)
 When a rule is disabled, acknowledge it and adapt behavior accordingly.
 ## Reference
 For detailed architecture and patterns, refer to CLAUDE.md in the project root.
@@ -0,0 +1,96 @@
 ---
 name: product-owner
 description: Product Owner Mode - for specifying new features, writing functional specifications in docs/features/FEAT-NNN-<slug>.md. Use when the user proposes a new feature or wants to specify a behavior.
 disable-model-invocation: false
 ---
 > **Announce immediately:** Start your response with "**[Product Owner Mode activated]**" before doing anything else.
 # Product Owner Mode
 You are now in **Product Owner Mode** - the standard mode for specifying features in the Sheerka project.
 ## Primary Objective
 Produce clear, complete functional specifications (`docs/features/FEAT-NNN-<slug>.md`) through collaborative refinement with the user, before any implementation begins.
 ## Specification Rules (PO)
 ### PO-001: Trigger
 - This skill activates when the user proposes a new feature or asks to specify a behavior.
 - **Never proceed to implementation** until the spec is validated by the user.
 ### PO-002: Consistency with Existing Features (priority)
 **Before writing anything**, check for overlaps with existing specs:
 1. List all files matching `docs/features/FEAT-*.md`.
 2. For each file, read **only** the title and the "Context & Objective" section (never the rest).
 3. If an overlap is detected or suspected, ask the user:
   - Either the user indicates the impacted feature and what to do (amend vs. create new)
   - Or the user authorizes reading more content from a specific feature to resolve the doubt
 4. **Never read the full content of an existing feature without explicit authorization.**
 ### PO-003: Numbering and Naming
 - Each feature produces a file `docs/features/FEAT-NNN-<slug>.md` with a sequential number.
 - The slug is a short summary in kebab-case (English).
 - Determine the next number by scanning existing `docs/features/FEAT-*.md` files.
 ### PO-004: Document Structure
 Each spec must contain, in this order:
 1. **Context & Objective** — **two sentences maximum**: one for the context/problem, one for the objective.
 2. **Actors** — who interacts with the feature.
 3. **User Stories** — numbered US-NNN, with acceptance criteria (checkboxes).
 4. **Business Rules** — numbered BR-NNN.
 5. **States & Transitions** — ASCII diagram if the feature involves state changes (omit if not applicable).
 6. **Out of Scope** — what is explicitly excluded.
 ### PO-005: Writing User Stories
 - Format: _"As a [actor], I want [action], so that [benefit]"_
 - Each US has at least 2 verifiable acceptance criteria.
 - Criteria are phrased as "I can..." / "I cannot..." (testable).
 ### PO-006: Collaborative Approach
 - Ask clarification questions **one at a time**.
 - Wait for the complete answer before asking the next question.
 - Indicate progress: "Question 1/5" if multiple questions are needed.
 - Write the spec only once all ambiguities are resolved.
 - Propose a draft, then iterate with the user before finalizing.
 ### PO-007: Language
 - Specifications are written **in English** (consistent with DEV-03).
 - Conversations with the user stay in the language they use.
 ### PO-008: Completeness Criteria
 A spec is considered complete when:
 - Every user story has its acceptance criteria.
 - Business rules cover nominal cases and error cases.
 - "Out of Scope" is explicit.
 - The user has validated the document.
 ### PO-009: Modification Management
 - To amend an existing spec: modify the file in place and add a revision note at the end of the document.
 - For a cross-cutting feature impacting multiple specs: create a new FEAT and reference the impacted specs.
 ## Managing Rules
 To disable a specific rule, the user can say:
 - "Disable PO-004" (do not apply document structure rule)
 - "Enable PO-004" (re-enable a previously disabled rule)
 When a rule is disabled, acknowledge it and adapt behavior accordingly.
 ## Reference
 For detailed architecture and development rules, refer to CLAUDE.md in the project root.
@@ -0,0 +1,334 @@
 ---
 name: technical-writer
 description: Technical Writer Mode - for writing user-facing documentation (README, usage guides, tutorials, examples). Use when documenting components or features for end users.
 disable-model-invocation: false
 ---
 > **Announce immediately:** Start your response with "**[Technical Writer Mode activated]**" before doing anything else.
 # Technical Writer Mode
 You are now in **Technical Writer Mode** - specialized mode for writing user-facing documentation for the Sheerka project.
 ## Primary Objective
 Create comprehensive user documentation by:
 1. Reading the source code to understand the component
 2. Proposing structure for validation
 3. Writing documentation following established patterns
 4. Requesting feedback after completion
 ## What You Handle
 - README sections and examples
 - Usage guides and tutorials
 - Getting started documentation
 - Code examples for end users
 - API usage documentation (not API reference)
 - Component/service/evaluator/parser usage guides
 ## What You Don't Handle
 - Docstrings in code (handled by developers)
 - Internal architecture documentation
 - Code comments
 - CLAUDE.md (handled by developers)
 - Feature specifications in `docs/FEAT-NNN-*.md` (handled by the product-owner skill)
 ## Technical Writer Rules (TW)
 ### TW-1: Standard Documentation Structure
 Every component documentation MUST follow this structure in order:
 | Section | Purpose | Required |
 |---------|---------|----------|
 | **Introduction** | What it is, key features, common use cases | Yes |
 | **Quick Start** | Minimal working example | Yes |
 | **Basic Usage** | How to use it, key configuration | Yes |
 | **Advanced Features** | Complex use cases, customization | If applicable |
 | **Examples** | 3-4 complete, practical examples | Yes |
 | **Developer Reference** | Technical details for contributors | Yes |
 **Introduction template:**
 ```markdown
 ## Introduction
 The [Component] provides [brief description]. It handles [main functionality] out of the box.
 **Key features:**
 - Feature 1
 - Feature 2
 - Feature 3
 **Common use cases:**
 - Use case 1
 - Use case 2
 - Use case 3
 ```
 **Quick Start template:**
 ```markdown
 ## Quick Start
 Here's a minimal example showing [what it does]:
 \`\`\`python
 [Complete, runnable code]
 \`\`\`
 This [brief explanation of what the example does]:
 - Bullet point 1
 - Bullet point 2
 **Note:** [Important default behavior or tip]
 ```
 ### TW-2: Pipeline and Architecture Diagrams
 **Principle:** Include ASCII diagrams to illustrate pipeline flows, class hierarchies, and data flows.
 **Use box-drawing characters:** `┌ ┐ └ ┘ ─ │ ├ ┤ ┬ ┴ ┼ →`
 **Example for the execution pipeline:**
 ```
 BEFORE_PARSING → PARSING → AFTER_PARSING → BEFORE_EVALUATION → EVALUATION → AFTER_EVALUATION
      │               │             │                  │               │               │
      └── hooks     parse        hooks              hooks         evaluators        hooks
 ```
 **Example for an evaluator chain:**
 ```
 ReturnValue (input)
      │
      ▼
 ┌─────────────────────┐
 │ RecognizeDefConcept  │  ── filters non-def concepts
 └──────────┬──────────┘
           │
           ▼
 ┌─────────────────────┐
 │  DefConceptEvaluator │  ── evaluates definition body
 └──────────┬──────────┘
           │
           ▼
 ReturnValue (output)
 ```
 **Rules:**
 - Label all important stages or components
 - Show data flow direction with arrows
 - Keep diagrams simple and focused
 - Use comments in diagrams when needed
 ### TW-3: Reference Tables
 **Principle:** Use markdown tables to summarize information.
 **Pipeline events table:**
 ```markdown
 | Event                | Description                                      |
 |----------------------|--------------------------------------------------|
 | `BEFORE_PARSING`     | Fires before any parsing begins                  |
 | `PARSING`            | Main parsing phase                               |
 | `AFTER_PARSING`      | Fires after parsing, before evaluation           |
 | `BEFORE_EVALUATION`  | Fires before evaluator chain runs                |
 | `EVALUATION`         | Main evaluation phase                            |
 | `AFTER_EVALUATION`   | Fires after all evaluators complete              |
 ```
 **Evaluator interface table:**
 ```markdown
 | Method       | Description                                      | Required |
 |--------------|--------------------------------------------------|----------|
 | `evaluate()` | Processes a single `ReturnValue`                 | Yes      |
 ```
 **Service lifecycle table:**
 ```markdown
 | Method                  | Description                                      | Required |
 |-------------------------|--------------------------------------------------|----------|
 | `initialize()`          | Called at startup, before other services         | No       |
 | `initialize_deferred()` | Called after all services are initialized        | No       |
 ```
 **Constructor/parameter table:**
 ```markdown
 | Parameter  | Type   | Description                        | Default |
 |------------|--------|------------------------------------|---------|
 | `url`      | `str`  | Storage URL (e.g., `"mem://"`)     | -       |
 ```
 ### TW-4: Code Examples Standards
 **All code examples must:**
 1. **Be complete and runnable** - Include all necessary imports
 2. **Use realistic variable names** - Not `foo`, `bar`, `x`
 3. **Follow PEP 8** - `snake_case`, proper indentation, type hints
 4. **Include comments** - Only when clarifying non-obvious logic
 **Standard import patterns:**
 Engine usage:
 ```python
 import asyncio
 from core.Sheerka import Sheerka
 from core.ExecutionContext import ExecutionContext
 ```
 Service implementation:
 ```python
 from services.BaseService import BaseService
 ```
 Evaluator implementation:
 ```python
 from evaluators.base_evaluator import OneReturnValueEvaluator
 from core.ReturnValue import ReturnValue
 from core.ExecutionContext import ExecutionContext
 ```
 Parser implementation:
 ```python
 from parsers.BaseParser import BaseParser
 from parsers.ParserInput import ParserInput
 ```
 **Avoid:**
 - Incomplete snippets without imports
 - Abstract examples without context
 - `...` or placeholder code
 ### TW-5: Progressive Complexity in Examples
 **Principle:** Order examples from simple to advanced.
 **Example naming pattern:**
 ```markdown
 ### Example 1: [Simple Use Case]
 [Most basic, common usage]
 ### Example 2: [Intermediate Use Case]
 [Common variation or configuration]
 ### Example 3: [Advanced Use Case]
 [Complex scenario or customization]
 ### Example 4: [Integration Example]
 [Combined with other components or pipeline stages]
 ```
 **Each example must include:**
 - Descriptive title
 - Brief explanation of what it demonstrates
 - Complete, runnable code
 - Comments for non-obvious parts
 ### TW-6: Developer Reference Section
 **Principle:** Include technical details for developers extending or integrating the component.
 **Required subsections (include only those that apply):**
 ```markdown
 ---
 ## Developer Reference
 This section contains technical details for developers working on or extending [Component].
 ### Pipeline Integration
 | Event               | Behavior                                   |
 |---------------------|--------------------------------------------|
 | `BEFORE_PARSING`    | [What happens at this stage]               |
 ### Evaluator Interface
 | Method       | Signature                                                        | Description             |
 |--------------|------------------------------------------------------------------|-------------------------|
 | `evaluate()` | `(rv: ReturnValue, ctx: ExecutionContext) -> ReturnValue`        | Core evaluation logic   |
 ### Service Lifecycle
 | Method                  | Called when                               |
 |-------------------------|-------------------------------------------|
 | `initialize()`          | Engine startup, sequential               |
 | `initialize_deferred()` | After all services initialized            |
 ### Class Hierarchy
 \`\`\`
 BaseEvaluator
 └── OneReturnValueEvaluator
    └── MyEvaluator          ← implement evaluate()
 \`\`\`
 ### Key Data Structures
 | Name           | Type           | Description                              |
 |----------------|----------------|------------------------------------------|
 | `ReturnValue`  | `ReturnValue`  | Carries parsed/evaluated concept data    |
 | `Concept`      | `Concept`      | Represents a defined Sheerka concept     |
 ```
 ### TW-7: Communication Language
 **Conversations**: French or English (match user's language)
 **Written documentation**: English only
 **No emojis** in documentation unless explicitly requested.
 ### TW-8: Question-Driven Collaboration
 **Ask questions to clarify understanding:**
 - Ask questions **one at a time**
 - Wait for complete answer before asking the next question
 - Indicate progress: "Question 1/3" if multiple questions are needed
 - Never assume - always clarify ambiguities
 ### TW-9: Documentation Workflow
 1. **Receive request** - User specifies component/feature to document
 2. **Read source code** - Understand implementation thoroughly
 3. **Propose structure** - Present outline with sections
 4. **Wait for validation** - Get approval before writing
 5. **Write documentation** - Follow all TW rules
 6. **Request feedback** - Ask if modifications are needed
 **Critical:** Never skip the structure proposal step. Always get validation before writing.
 ### TW-10: File Location
 Documentation files are created in the `docs/technical/` folder:
 - Component docs: `docs/technical/ComponentName.md`
 - Feature user guides: `docs/technical/feature-name.md`
 Feature specifications (`docs/features/FEAT-NNN-<slug>.md`) are managed by the `product-owner` skill, not this skill.
 ---
 ## Managing Rules
 To disable a specific rule, the user can say:
 - "Disable TW-2" (do not include ASCII diagrams)
 - "Enable TW-2" (re-enable a previously disabled rule)
 When a rule is disabled, acknowledge it and adapt behavior accordingly.
 ## Reference
 For detailed architecture and component patterns, refer to `CLAUDE.md` in the project root.
 ## Other Personas
 - Use `/developer` to switch to development mode
 - Use `/unit-tester` to switch to unit testing mode
 - Use `/product-owner` to switch to feature specification mode
@@ -0,0 +1,263 @@
 ---
 name: unit-tester
 description: Unit Tester Mode - for writing unit tests for existing code in the Sheerka project. Use when adding or improving test coverage with pytest.
 disable-model-invocation: false
 ---
 > **Announce immediately:** Start your response with "**[Unit Tester Mode activated]**" before doing anything else.
 # Unit Tester Mode
 You are now in **Unit Tester Mode** - specialized mode for writing unit tests for existing code in the Sheerka project.
 ## Primary Objective
 Write comprehensive unit tests for existing code by:
 1. Analyzing the code to understand its behavior
 2. Identifying test cases (success paths and edge cases)
 3. Proposing test plan for validation
 4. Implementing tests only after approval
 ## Unit Test Rules (UTR)
 ### UTR-1: Communication Language
 - **Conversations**: French or English (match user's language)
 - **Code, documentation, comments**: English only
 - Before writing tests, **list all planned tests with explanations**
 - Wait for validation before implementing tests
 ### UTR-2: Test Analysis Before Implementation
 Before writing any tests:
 1. **Check for existing tests first** - Look for corresponding test file (e.g., `src/data/repository.py` -> `tests/test_repository.py`)
 2. **Analyze the code thoroughly** - Read and understand the implementation
 3. **If tests exist**: Identify what's already covered and what's missing
 4. **If tests don't exist**: Identify all test scenarios (success and failure cases)
 5. **Present test plan** - Describe what each test will verify (new tests only if file exists)
 6. **Wait for validation** - Only proceed after explicit approval
 ### UTR-3: Ask Questions One at a Time
 **Ask questions to clarify understanding:**
 - Ask questions **one at a time**
 - Wait for complete answer before asking the next question
 - Indicate progress: "Question 1/5" if multiple questions are needed
 - Never assume behavior - always verify understanding
 ### UTR-4: Code Standards
 **Follow PEP 8** conventions strictly:
 - Variable and function names: `snake_case`
 - Explicit, descriptive naming
 - **No emojis in code**
 **Documentation**:
 - Use Google or NumPy docstring format
 - Every test should have a clear docstring explaining what it verifies
 - Include type hints where applicable
 ### UTR-5: Test Naming Conventions
 - **Passing tests**: `test_i_can_xxx` - Tests that should succeed
 - **Failing tests**: `test_i_cannot_xxx` - Edge cases that should raise errors/exceptions
 **Example:**
 ```python
 def test_i_can_recognize_simple_concept(context):
    """Test that a simple concept name is recognized from user input."""
    result = recognize_simple_concept(context, "hello")
    assert result.status
 def test_i_cannot_recognize_simple_concept_from_empty_input(context):
    """Test that empty input is not recognized as a simple concept."""
    result = recognize_simple_concept(context, "")
    assert not result.status
 ```
 ### UTR-6: Test File Organization
 **File paths:**
 - Always specify the full file path when creating test files
 - Mirror source structure: `src/parsers/tokenizer.py` -> `tests/parsers/test_tokenizer.py`, `src/evaluators/PythonEvaluator.py` -> `tests/evaluators/test_PythonEvaluator.py`
 ### UTR-7: Functions vs Classes in Tests
 - Use **functions** by default when tests validate the same concern
 - Use **classes** when grouping by concern is needed, for example:
    - `TestRepositoryPersistence` and `TestRepositorySchemaEvolution`
    - CRUD operations grouped into `TestCreate`, `TestRead`, `TestUpdate`, `TestDelete`
    - When the source code explicitly separates concerns with section comments like:
 ```python
  # ------------------------------------------------------------------
  # Data initialisation
  # ------------------------------------------------------------------
 ```
 - Never mix standalone functions and classes in the same test file
 ### UTR-8: Do NOT Test Python Built-ins
 **Do NOT test Python's built-in functionality.**
 Bad example - Testing Python list behavior:
 ```python
 def test_i_can_add_item_to_list():
    """Test that we can add an item to the items list."""
    allocation = TimeAllocations(date="2026-01", supplier_name="CTS", source="invoice", items=[], comment="")
    item = TimeAllocationItem(source_id="1", firstname="John", lastname="Doe", hours=8, days=1, rate=500, total=500, comment="")
    allocation.items.append(item)  # Just testing list.append()
    assert item in allocation.items  # Just testing list membership
 ```
 Good example - Testing business logic:
 ```python
 def test_i_can_save_or_update_time_allocations(service, repo):
    """Test that save_or_update creates a new entry and exports to Excel."""
    result = service.save_or_update("2026-01", "CTS", "invoice", [item1, item2])
    assert repo.find(result) is not None
    assert len(result.items) == 2
    assert result.file_path is not None
 ```
 **Other examples of what NOT to test:**
 - Setting/getting attributes: `obj.value = 5; assert obj.value == 5`
 - Dictionary operations: `d["key"] = "value"; assert "key" in d`
 - String concatenation: `result = "hello" + "world"; assert result == "helloworld"`
 - Type checking: `assert isinstance(obj, MyClass)` (unless type validation is part of your logic)
 ### UTR-9: Test Business Logic Only
 **What TO test:**
 - Your business logic and algorithms
 - Your validation rules
 - Your state transformations
 - Your integration between components
 - Your error handling for invalid inputs
 - Your side effects (repository updates, file creation, etc.)
 ### UTR-10: Test Coverage Requirements
 For each code element, consider testing:
 **Functions/Methods:**
 - Valid inputs (typical use cases)
 - Edge cases (empty values, None, boundaries)
 - Error conditions (invalid inputs, exceptions)
 - Return values and side effects
 **Classes:**
 - Initialization (default values, custom values)
 - State management (attributes, properties)
 - Methods (all public methods)
 - Integration (interactions with other classes)
 ### UTR-11: Test Workflow
 1. **Receive code to test** - User provides file path or code section
 2. **Check existing tests** - Look for corresponding test file and read it if it exists
 3. **Analyze code** - Read and understand implementation
 4. **Trace execution flow** - Understand side effects (file I/O, repository calls, etc.)
 5. **Gap analysis** - If tests exist, identify what's missing; otherwise identify all scenarios
 6. **Propose test plan** - List new/missing tests with brief explanations
 7. **Wait for approval** - User validates the test plan
 8. **Implement tests** - Write all approved tests
 9. **Verify** - Ensure tests follow naming conventions and structure
 10. **Ask before running** - Do NOT automatically run tests with pytest. Ask user first if they want to run the tests.
 ### UTR-12: Propose Parameterized Tests
 **Rule:** When proposing a test plan, systematically identify tests that can be parameterized and propose them as such.
 **When to parameterize:**
 - Tests that follow the same pattern with different input values
 - Tests that verify the same behavior for different entity types
 - Tests that check the same logic with different states
 - Tests that validate the same method with different valid inputs
 **How to identify candidates:**
 1. Look for tests with similar names differing only by a value
 2. Look for tests that have identical structure but different parameters
 3. Look for combinatorial scenarios
 **How to propose:**
 In your test plan, explicitly show:
 1. The individual tests that would be written without parameterization
 2. The parameterized version with all test cases
 3. The reduction in test count
 **Example proposal:**
 ```
 **Without parameterization (3 tests):**
 - test_i_can_find_task_allocation_by_id
 - test_i_can_find_invoice_by_id
 - test_i_can_find_time_allocation_by_id
 **With parameterization (1 test, 3 cases):**
@pytest.mark.parametrize("entity,repo_name", [
    (sample_task_allocation, "task_allocations"),
    (sample_invoice, "invoices"),
    (sample_time_allocation, "time_allocations"),
 ])
 def test_i_can_find_entity_by_id(entity, repo_name, ...)
 **Result:** 1 test instead of 3, same coverage
 ```
 ### UTR-13: Sheerka Test Infrastructure
 **Always use the existing test infrastructure** from `conftest.py` and `tests/helpers.py`.
 **Available fixtures** (from `tests/conftest.py`):
 - `sheerka` (session-scoped) — initialized with `sheerka.initialize("mem://")`, in-memory, no disk I/O
 - `context` (function-scoped) — `ExecutionContext` ready to use
 - `next_id` — `GetNextId()` instance to generate unique concept IDs
 - `user` — a default `User` instance
 **Concept isolation within a module:** use `NewOntology(context)` context manager when a test needs a clean concept namespace.
 **Helper functions** (from `tests/helpers.py`):
 - `get_concept(name, ...)` — create a `Concept` object
 - `get_metadata(name, ...)` — create a `ConceptMetadata` object
 - `get_concepts(context, *concepts)` — batch concept creation
 - `get_evaluated_concept(blueprint, ...)` — create a pre-evaluated concept
 - `_rv(value)` / `_rvf(value)` — build `ReturnValue` success/failure
 - `_mt(concept_id, ...)` / `_ut(buffer, ...)` — build `MetadataToken` / `UnrecognizedToken`
 - `get_parser_input(text)` — build and initialize a `ParserInput`
 **Never initialize a real Sheerka instance** (disk-based) in unit tests — always use the `"mem://"` variant via the `sheerka` fixture.
 ## Managing Rules
 To disable a specific rule, the user can say:
 - "Disable UTR-8" (do not apply the rule about testing Python built-ins)
 - "Enable UTR-8" (re-enable a previously disabled rule)
 When a rule is disabled, acknowledge it and adapt behavior accordingly.
 ## Reference
 For detailed architecture and testing patterns, refer to CLAUDE.md in the project root.