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neokapi: Architecture

neokapi is an open-source, format-aware content engine built in Go. It parses any format into one unified content model, edits the content inside it, checks it, and writes it back — byte-for-byte. Get your content right — edit it, check it, keep it on brand — and the same engine makes it work in every language. It also serves AI ingestion and programmatic editing. It provides format-aware document parsing, composable processing tools, and a concurrent streaming pipeline. The kapi CLI and desktop app and Kapi React are surfaces built on top of this engine — but the content model, format readers and writers, tools, and pipeline are equally a Go library you can import and drive directly. If you want to start with running code, jump to the Go quickstart; for the reasoning behind each major design choice, see the Architecture Decisions.

Processing Pipeline​

neokapi processing architectureA streaming pipeline: a format reader at the left edge and a writer at the right that sinks to a file (round-trip) or a content store (overlays); a serial chain of annotate, translate and QA tools in the middle, with the translate stage fanning out across parallel goroutines; content-memory, terms and a translation provider (LLM or MT) feeding it from above; and a gRPC plugin band (Okapi bridge, tier-3 segmenter/media/OCR plugins, remote plugins) feeding it from below. Each stage is a goroutine joined by Part channels, and the whole pipeline runs over many documents in parallel.documents in parallel · MaxConcurrencyTermsterm-lookupContent MemoryrecycleProviderLLM or MTSourcessource binding · fileapp.jsonpage.htmlguide.docxstrings.xmlReaderDataFormatchanAnnotatesegment · terms · NERchanfan-out · N goroutinesordered fan-inTranslategoroutine 1Translategoroutine 2Translategoroutine 3Translategoroutine 4chanQAqa · enforcechanWriterDataFormatSinksink binding · file or storefileround-tripstoreoverlaysPlugin system · gRPC subprocess bridgeOkapi BridgeJava filtersTier-3 pluginssegmenter · media · OCRRemote / native plugincustom tool · format

The edges are the flow's source and sink — bindings that decide where content enters and leaves. The default, shown above, is the file binding: a reader turns source files of any format into a stream of Parts and a writer turns the stream back into files, byte-for-byte. The same flow can instead bind to the project store, a .kpz workspace, or an interchange file — with no reader or writer (flows: source and sink). Between the edges runs a flow: a serial chain of tools connected by buffered channels of Parts. The tools divide by capability — annotators attach stand-off overlays and annotations (segmentation, terminology, entities, QA findings, analysis results), translators fill in targets, and QA tools check and enforce — while content memory and the terms store feed the relevant stages.

Concurrency runs at three levels at once: each stage is its own goroutine joined by channels with automatic backpressure; a block-handling stage such as translation can fan out across N goroutines with an ordered fan-in; and the executor runs many documents in parallel, bounded by MaxConcurrency. Context cancellation propagates to every stage. Readers, writers, and tools can be supplied by plugins — the kapi-sat segmenter, the kapi-pdfium PDF reader, or any remote plugin — dispatched as subprocesses over gRPC. See AD-001 and AD-004.

Package Layout​

neokapi/
├── go.mod                           # module github.com/neokapi/neokapi
├── go.work                          # coordinates the framework + CLI + app modules
│
├── core/                            # Platform-agnostic framework packages
│   ├── model/                       # Part, Block, Layer, Run, Target, Overlay, Data, Media
│   ├── format/                      # DataFormatReader/Writer interfaces, detection
│   ├── tool/                        # Tool interface, BaseTool dispatch
│   ├── flow/                        # Executor, Builder, FlowDefinition
│   ├── registry/                    # FormatRegistry, ToolRegistry
│   ├── encoding/                    # Text encoding utilities
│   ├── locale/                      # BCP-47 locale handling
│   ├── editor/                      # Block index serialization and preview generation
│   ├── version/                     # Build version info
│   ├── formats/                     # Built-in format implementations
│   │   └── …                        # one package each (reader.go, writer.go, config.go)
│   ├── ai/                          # AI pipeline tools, NER, prompt assembly
│   ├── mt/                          # Machine-translation pipeline tools
│   ├── brand/                       # Brand voice profiles, scoring, starter packs
│   ├── tools/                       # Utility tools (wordcount, pseudo, segmentation, …)
│   ├── storage/                     # Shared SQLite infrastructure (Open, Migrate)
│   ├── project/                     # kapi.yaml recipe format (Load, Save, Validate)
│   ├── plugin/                      # Plugin system (gRPC, loader, bridge, registry)
│   └── internal/testutil/           # Shared test helpers
│
├── memory/                          # Content memory (interface, in-memory, SQLite)
├── terms/                           # Terminology (interface, in-memory, SQLite)
├── providers/
│   ├── ai/                          # package aiprovider — LLM backends
│   └── mt/                          # package mtprovider — MT backends
│
├── host/                            # Cobra-free runtime + services (module: …/host)
├── cli/                             # Thin Cobra shell over host (module: …/cli)
├── kapi/                            # Kapi standalone CLI (module: …/kapi)
├── apps/kapi-desktop/               # Kapi Desktop (Wails v3; module: …/kapi-desktop)
├── packages/
│   ├── ui/                          # @neokapi/ui-primitives — shared shadcn/ui primitives
│   └── flow-editor/                 # @neokapi/flow-editor — shared React flow editor
└── docs/                            # Repo internals (format ops, testing, runbooks)

The framework module (repo root) stays platform-agnostic. memory/, terms/, and providers/ are top-level framework packages — not nested under core/. Front-ends such as the CLI and the desktop app, and any other consumer, attach through the plugin and extension registries rather than by direct imports, so the framework never depends on a particular platform.

The framework concepts​

To see these concepts working together in a few lines of Go — register the formats, read a file into the content model, run a tool, and write the result — start with the Go quickstart. The framework rests on a few concepts, each with its own page:

  • Content Model — the format-independent representation. A document becomes a stream of Parts carrying layers, blocks, fragments, spans, data, and media. Embedded content (HTML inside JSON, CDATA in XML) is modeled as nested layers, each with its own format.
  • Formats — paired readers and writers that produce and consume the content model.
  • Tools — the processing units. Each reads Parts from a channel, transforms them, and writes them out.
  • Flows — named, ordered compositions of tools.
  • Pipeline — the concurrent executor that runs a flow: goroutines, buffered channels, and context-driven cancellation.

For the concrete Go interfaces and method signatures behind these concepts, see the Interface Reference. For the design rationale, see the Architecture Decisions.