Verified 2026-08-31
Track producers, validators, MCP servers, viewers, converters, and maintained knowledge systems that use Open Knowledge Format in practice.
Editorial standard
Entries link to inspectable implementations. Their status, compatibility, security, maintenance, and claims remain the responsibility of their maintainers.
Compatibility
This matrix records capabilities declared in linked documentation or repositories as of 2026-08-31. It is an implementation snapshot, not a certification mark.
| Tool | Spec | Role | Trust and lifecycle | Retrieval |
|---|---|---|---|---|
| Google reference agent ↗ | v0.2 | Producer and viewer | Emits and displays v0.2 fields | Index, search, and graph viewer |
| Google Cloud Knowledge Catalog ↗ | v0.2 | Publisher and governed serving layer | Maps v0.2 signal fields to indexed aspects | Search, LookupContext, entries.get, and IAM |
| OpenKnowledge ↗ | v0.2 | Editor, rules, CLI, MCP | Validates optional field families | Agentic search and generated indexes |
| serradura/okf ↗ | v0.2 | Ruby library, CLI, MCP, TUI | Reads, validates, and searches v0.2 | Text search, MCP, and graph |
| okfcli/okf ↗ | v0.2 | Go library and CLI | Trust tiers, staleness, provenance | Search, graph, links, and list |
| W4G1/okf ↗ | v0.2 | Rust library and CLI | Trust and clock-pinned staleness | Links, graph, parse, and diff |
| okf-toolkit ↗ | v0.1 and v0.2 | CLI, MCP, GitHub Action | Version-scoped lint rules | MCP resources and tools |
| OpenWiki ↗ | v0.1 | Wiki producer and viewer | v0.2 migration remains open | Indexes, graph, connectors |
Implementations
Knowledge base and agent integrations
CommunityOKF v0.2 starter pack, advisory project rules, generated indexes, skills, CLI, MCP, and integrations for common coding agents.
Inspect implementation ↗
Generator and maintainer
AdopterLangChain CLI that generates and maintains OKF-shaped codebase and personal wikis, with deterministic indexes and frontmatter checks.
Inspect implementation ↗
Reference implementation
OfficialCanonical Google Cloud v0.2 specification, reference producer, sample bundles, tests, and self-contained graph visualizer.
Inspect implementation ↗
Governed catalog and context serving
OfficialOfficial kcmd sample that publishes OKF v0.2 concepts as governed, searchable Knowledge Catalog entries for agent retrieval.
Inspect implementation ↗
CLI, skills, and viewer
CommunityLocal Ruby and Docker toolkit for producing, maintaining, validating, and visualizing OKF bundles.
Inspect implementation ↗
Linter and MCP server
CommunityCLI with spec-conformance checks, hygiene warnings, JSON output, and deterministic MCP navigation tools.
Inspect implementation ↗
Document converter
CommunityConverts existing documentation into linked, agent-readable OKF knowledge bundles.
Inspect implementation ↗
Integrity and provenance
ExperimentOptional SHA-256 manifest and Ed25519 signature layer for tamper-evident OKF bundles.
Inspect implementation ↗
Repository memory
ExperimentOKF-native memory layer exploring freshness, confidence, contradiction, and durable engineering rationale.
Inspect implementation ↗
Publishing engine
CommunityOpen-source publishing engine for rendering and distributing Open Knowledge Format content.
Inspect implementation ↗
Go CLI and library
CommunityOKF v0.2 parser, validator, trust and lifecycle reporting, search, graph output, and Attested Computation checks.
Inspect implementation ↗
Rust CLI and library
CommunityPure-Rust v0.2 implementation with validation, trust reports, staleness checks, graphs, semantic diffs, and CI workflows.
Inspect implementation ↗
Rust CLI, MCP server, and GitHub Action
CommunityVersion-aware v0.1 and v0.2 validation, linting, MCP access, and pull-request annotations.
Inspect implementation ↗
Field lessons
These are ecosystem patterns, not additional v0.2 conformance requirements.
01
The v0.2 specification keeps the conformance floor small. Production tools add descriptive metadata, provenance checks, lifecycle policy, link hygiene, orphan detection, and retrieval-oriented checks.
02
OpenWiki and the reference agent treat indexes as derived navigation, reducing drift and avoiding unnecessary model-written bookkeeping.
03
High-quality bundles link concepts in sentences that explain the relationship instead of adding links merely to increase graph density.
04
Freshness, confidence, provenance, contradictions, deprecation, and human review become more important than initial generation once a bundle is used over time.
Keep the directory useful
Submit a public repository, integration note, sample bundle, validator, converter, viewer, or implementation report for review.
Senior Engineer, Product Builder, and Founder
Systems, product software, and practical execution for teams that need clear decisions, durable implementation, and agent-ready knowledge structures.