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Documentation Index

Last Updated: 2026-03-06 Total Documents: 34 Generated by: update.prompt v2.0

Executive Summary​

This index catalogues all architecture documentation for the NDX (National Digital Exchange) Innovation Sandbox ecosystem. Documents are organised by category, covering 14 repositories, 247 AWS accounts, and the complete operational lifecycle of the UK government cloud sandbox platform.

Inventory & Overview (00-09)​

DocTitleWordsDiagrams
00-index.mdDocumentation Index (this file)----
00-repo-inventory.mdRepository Inventory1,900+1
01-upstream-analysis.mdUpstream Fork Analysis1,000+2
02-aws-organization.mdAWS Organization Structure1,000+3
03-hub-account-resources.mdHub Account Resources1,100+1
04-cross-account-trust.mdCross-Account Trust1,100+3
05-service-control-policies.mdService Control Policies1,700+2

ISB Core (10-19)​

DocTitleWordsDiagrams
10-isb-core-architecture.mdISB Core Architecture3,300+3
11-lease-lifecycle.mdLease Lifecycle2,200+8
12-isb-frontend.mdISB Frontend2,500+3
13-isb-customizations.mdISB Customizations (CDDO)3,400+3

ISB Satellites (20-29)​

DocTitleWordsDiagrams
20-approver-system.mdApprover System1,400+2
21-billing-separator.mdBilling Separator1,100+2
22-cost-tracking.mdCost Tracking1,100+2
23-deployer.mdISB Deployer (Archived)1,100+2
24-utils.mdISB Utils1,300+2
25-ou-metrics.mdOU Account Metrics (Stop-Gap)800+2

NDX Websites (30-39)​

DocTitleWordsDiagrams
30-ndx-website.mdNDX Website1,900+1
31-signup-flow.mdSignup Flow1,500+3
32-scenarios-microsite.mdScenarios Microsite2,300+2

Infrastructure (40-49)​

DocTitleWordsDiagrams
40-lza-configuration.mdLZA Configuration2,500+2
41-terraform-scp.mdTerraform SCP2,100+3
42-terraform-resources.mdTerraform Resources1,000+2
43-ndx-try-aws-isb.mdNDX Try AWS ISB (Placeholder)750+1

CI/CD (50-59)​

DocTitleWordsDiagrams
50-github-actions-inventory.mdGitHub Actions Inventory1,400+2
51-oidc-configuration.mdOIDC Configuration1,400+2
52-deployment-flows.mdDeployment Flows1,400+15
53-manual-operations.mdManual Operations1,400+2

Security (60-69)​

DocTitleWordsDiagrams
60-auth-architecture.mdAuth Architecture1,900+4
61-encryption.mdEncryption1,500+1
62-secrets-management.mdSecrets Management1,600+2
63-compliance.mdCompliance2,400+2

Data Flows & Integration (70-79)​

DocTitleWordsDiagrams
70-data-flows.mdData Flows1,800+5
71-external-integrations.mdExternal Integrations1,800+4
72-repo-dependencies.mdRepository Dependencies1,700+3

Master Diagrams (80-89)​

DocTitleWordsDiagrams
80-c4-architecture.mdC4 Architecture1,500+5
81-aws-architecture.mdAWS Architecture1,600+6
82-process-flows.mdProcess Flows2,000+7

Issues & Meta (90-99)​

DocTitleWordsDiagrams
90-issues-discovered.mdIssues Discovered2,200+2

Architecture​

C4 Diagrams | AWS Architecture | ISB Core | Process Flows

Security​

Auth | Encryption | Secrets | Compliance | SCPs | Cross-Account Trust

Operations​

Manual Ops | Deployment Flows | GitHub Actions | Issues

Data & Integration​

Data Flows | External Integrations | Dependencies

Generated from source analysis on 2026-03-06. See 00-repo-inventory.md for full inventory.