## ADDED Requirements

### Requirement: Get GraphQL Schema Tool
The MCP server SHALL provide a `get_graphql_schema` tool that returns the complete GraphQL schema definition via introspection.

#### Scenario: Get GraphQL schema successfully
- **GIVEN** the GraphQL API is running and accessible
- **WHEN** the `get_graphql_schema` tool is invoked
- **THEN** the tool SHALL execute an introspection query
- **AND** return the complete schema including types, queries, mutations, and field descriptions
- **AND** format the result as human-readable text with structured schema information

#### Scenario: Schema retrieval when API is unavailable
- **GIVEN** the GraphQL API is not running
- **WHEN** the `get_graphql_schema` tool is invoked
- **THEN** the tool SHALL return an error indicating the API is unreachable
- **AND** provide guidance on starting the API

### Requirement: Execute GraphQL Query Tool
The MCP server SHALL provide an `execute_graphql_query` tool that executes arbitrary GraphQL queries and mutations.

#### Scenario: Execute valid GraphQL query
- **GIVEN** a valid GraphQL query is provided
- **WHEN** the `execute_graphql_query` tool is invoked with the query
- **THEN** the tool SHALL send the query to the GraphQL API
- **AND** return the query results as formatted JSON
- **AND** include all requested fields in the response

#### Scenario: Execute GraphQL query with variables
- **GIVEN** a GraphQL query with variable placeholders
- **WHEN** the `execute_graphql_query` tool is invoked with query and variables
- **THEN** the tool SHALL substitute variables correctly
- **AND** execute the query with the provided variable values
- **AND** return the results

#### Scenario: Execute GraphQL mutation
- **GIVEN** a valid GraphQL mutation query
- **WHEN** the `execute_graphql_query` tool is invoked with the mutation
- **THEN** the tool SHALL execute the mutation
- **AND** return the mutation results including any modified data
- **AND** persist changes to the database

#### Scenario: Execute invalid GraphQL query
- **GIVEN** a GraphQL query with syntax errors
- **WHEN** the `execute_graphql_query` tool is invoked
- **THEN** the tool SHALL return a GraphQL validation error
- **AND** include details about the syntax error
- **AND** not modify any data

#### Scenario: Execute query with GraphQL validation errors
- **GIVEN** a GraphQL query requesting non-existent fields
- **WHEN** the `execute_graphql_query` tool is invoked
- **THEN** the tool SHALL return a GraphQL validation error
- **AND** indicate which fields are invalid
- **AND** not execute the query

### Requirement: Tool Input Schema for GraphQL Execution
The `execute_graphql_query` tool SHALL accept a query string and optional variables object.

#### Scenario: Tool accepts query without variables
- **GIVEN** a simple GraphQL query without variables
- **WHEN** the tool is invoked with only the query parameter
- **THEN** the query SHALL execute successfully
- **AND** no variables are passed to the GraphQL API

#### Scenario: Tool accepts query with variables
- **GIVEN** a GraphQL query using variables
- **WHEN** the tool is invoked with query and variables parameters
- **THEN** both parameters SHALL be validated
- **AND** variables SHALL be passed as a JSON object to the GraphQL API
- **AND** the query executes with variable substitution