---
id: capability.infotech.hub-core-library
name: Reusable FOS Hub Core Primitives
summary: Reusable FastAPI, SQLAlchemy, and MCP primitives extracted from the State Hub for use by other
  FOS (Federation of Services) hubs.
owner: hub-core
status: draft
domain: infotech
tags:
- hub
- fastapi
- sqlalchemy
- mcp
maturity:
  discovery:
    current: D2
    target: D4
    confidence: medium
    rationale: 'README documents the extraction boundary from State Hub (CUST-WP-0025) and the first slice:
      base metadata, domain/repo registry primitives, agent inbox, progress-event/capability-request primitives,
      service catalog, DoI schemas.'
  availability:
    current: A1
    target: A3
    confidence: medium
    rationale: Python package (`hub-core`), pip-installable/importable; already has a `.forgejo/workflows/ci-smoke.yaml`
      CI check (ahead of most siblings on the Forgejo transition).
external_evidence:
  completeness:
    level: C1
    confidence: low
    basis: scope_vs_intent_and_consumer_expectations
    satisfied_expectations:
    - SQLAlchemy base metadata/timestamp helpers
    - domain and managed-repo registry primitives
    - agent message inbox primitives
    - progress-event/capability-request primitives
    - Forgejo Actions CI smoke check
    broken_expectations: []
    out_of_scope_expectations: []
  reliability:
    level: R1
    confidence: low
    basis: consumer_quality_signals
    known_reliability_risks:
    - first extraction slice only; hub-specific concepts (topics, workstreams, tasks, decisions, SBOM,
      token accounting) intentionally excluded so far
discovery:
  intent: Let new FOS hubs reuse the generic primitives State Hub already built, without importing State-Hub-specific
    domain concepts.
  includes:
  - SQLAlchemy base metadata/timestamp helpers
  - domain/repo registry and agent-inbox primitives
  - progress-event/capability-request primitives with generic JSON context
  - service catalog and DoI schemas
  excludes:
  - 'State-Hub-specific concepts: topics, workstreams, tasks, decisions, SBOM, token accounting'
  assumptions: []
  use_cases: []
  research_memos: []
availability:
  current_level: A1
  target_level: A3
  current_artifacts:
  - '`hub-core` Python package'
  target_artifacts: []
  consumption_modes:
  - library import
relations:
  depends_on: []
  supports:
    - capability.infotech.core-hub
  related_to:
    - capability.infotech.core-hub
    - capability.statehub.workstream-coordinate
evidence:
  documentation:
  - README.md
  - the-custodian:docs/hub-core-extraction-boundary.md
  tests:
  - tests/
  - .forgejo/workflows/ci-smoke.yaml
  consumer_feedback: []
  bug_reports: []
  incidents: []
consumer_guidance:
  recommended_for:
  - new FOS hub services wanting shared FastAPI/SQLAlchemy/MCP primitives
  not_recommended_for:
  - consumers needing State-Hub-specific domain concepts (not extracted yet)
  known_limitations:
  - first extraction slice; boundary still evolving alongside State Hub
promotion_history: []
---

# Reusable FOS Hub Core Primitives

## Overview

`hub-core` is being extracted from the standalone State Hub repository (CUST-WP-0025) to give other FOS hubs reusable FastAPI/SQLAlchemy/MCP primitives without pulling in State-Hub-specific domain concepts.

## Assessment notes

### Discovery

README documents the extraction boundary from State Hub (CUST-WP-0025) and the first slice: base metadata, domain/repo registry primitives, agent inbox, progress-event/capability-request primitives, service catalog, DoI schemas.

### Availability

Python package (`hub-core`), pip-installable/importable; already has a `.forgejo/workflows/ci-smoke.yaml` CI check (ahead of most siblings on the Forgejo transition).

### Completeness

First-pass honest assessment from the REUSE-WP-0017 coverage campaign
(reuse-surface). No external consumer feedback exists yet; levels reflect
scope-vs-intent documentation quality, not internal code quality.

### Reliability

No production consumer telemetry exists yet; reliability level is
intentionally conservative pending REUSE-WP-0019 reuse-telemetry evidence.

## Promotion checklist

- [x] ID follows `capability.<domain>.<name>` pattern
- [x] Maturity enums match `specs/CapabilityMaturityStandard.md`
- [x] `external_evidence` is populated separately from `maturity`
- [ ] Relations reference valid capability IDs (none yet)
- [x] Index entry added in `registry/indexes/capabilities.yaml`