> ## Documentation Index > Fetch the complete documentation index at: https://fastql.vachagan.dev/llms.txt > Use this file to discover all available pages before exploring further. # Capability catalog > Map documented FastQL features to their canonical OpenSpec requirements. The OpenSpec files are the canonical behavioral requirements. Documentation explains how to use the resulting capability; tests verify the implementation. | Capability | Canonical specification | User documentation | | ------------------------- | -------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------ | | Schema definitions | [schema-definition](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/schema-definition/spec.md) | [Types and fields](/build/types-and-fields) | | Definition extensions | [definition-extensions](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/definition-extensions/spec.md) | [Decorators and metadata](/reference/decorators) | | Schema building | [schema-building](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/schema-building/spec.md) | [Operations and schema](/build/operations-and-schema) | | Type system | [type-system](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/type-system/spec.md) | [Type system architecture](/architecture/type-system) | | Language parsing | [language-parsing](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/language-parsing/spec.md) | [Language pipeline](/architecture/language-pipeline) | | Query validation | [query-validation](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/query-validation/spec.md) | [Validation and execution](/architecture/validation-and-execution) | | Query execution | [query-execution](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/query-execution/spec.md) | [Schema and execution](/reference/schema-and-execution) | | Context injection | [context-injection](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/context-injection/spec.md) | [Context and Info](/resolve/context-and-info) | | HTTP integration contract | [http-integration-contract](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/http-integration-contract/spec.md) | [HTTP contract](/integrations/http-contract) | | Integration packaging | [integration-packaging](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/integration-packaging/spec.md) | [Integration overview](/integrations/overview) | | Web framework adapters | [python-web-framework-adapters](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/python-web-framework-adapters/spec.md) | [Integration overview](/integrations/overview) | | Development server | [dev-server](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/dev-server/spec.md) | [Development server](/tooling/dev-server) | | Server CLI | [server-cli](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/server-cli/spec.md) | [CLI](/tooling/cli) | | GraphQL playground | [graphql-playground](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/graphql-playground/spec.md) | [Development server](/tooling/dev-server) | | Schema endpoints | [schema-endpoints](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/schema-endpoints/spec.md) | [SDL and introspection](/tooling/schema-output) | | Introspection | [introspection](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/introspection/spec.md) | [SDL and introspection](/tooling/schema-output) | | Documentation site | [documentation-site](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/documentation-site/spec.md) | [Documentation contribution guide](/contribute/documentation) | | Data loaders | [data-loaders](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/data-loaders/spec.md) | [DataLoader](/data/dataloader) | | Schema extensions | [schema-extensions](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/schema-extensions/spec.md) | [Schema extensions](/data/schema-extensions) | | Subscription execution | [subscription-execution](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/subscription-execution/spec.md) | [Subscriptions](/protocol/subscriptions) | | Subscription transport | [subscription-transport](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/subscription-transport/spec.md) | [Subscriptions](/protocol/subscriptions) | | Incremental delivery | [incremental-delivery](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/incremental-delivery/spec.md) | [Incremental delivery](/protocol/incremental-delivery) | | Generic types | [generic-types](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/generic-types/spec.md) | [Generic types](/build/generic-types) | | Relay pagination | [relay-pagination](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/relay-pagination/spec.md) | [Relay pagination](/data/relay-pagination) | | Custom directives | [custom-directives](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/custom-directives/spec.md) | [Custom directives & visibility](/build/directives-and-visibility) | | Field visibility | [field-visibility](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/field-visibility/spec.md) | [Custom directives & visibility](/build/directives-and-visibility) | | Apollo Federation | [apollo-federation](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/apollo-federation/spec.md) | [Apollo Federation v2](/federation/overview) | | File uploads | [file-uploads](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/file-uploads/spec.md) | [File uploads & batching](/protocol/uploads-and-batching) | | Query batching | [query-batching](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/query-batching/spec.md) | [File uploads & batching](/protocol/uploads-and-batching) | | Tracing & instrumentation | [tracing-instrumentation](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/tracing-instrumentation/spec.md) | [Tracing & observability](/operations/observability) | | Pydantic integration | [pydantic-integration](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/pydantic-integration/spec.md) | [Pydantic integration](/integrations/pydantic) | | Testing utilities | [testing-utilities](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/testing-utilities/spec.md) | [Testing & schema export](/operations/testing-and-export) | | Schema export CLI | [schema-export-cli](https://github.com/MyGenX/FastQL/blob/main/openspec/specs/schema-export-cli/spec.md) | [Testing & schema export](/operations/testing-and-export) | This catalog describes implemented specifications only. Proposed changes remain under `openspec/changes` until they are implemented, synchronized, and archived.