From bf9d65d716c6dffe4296b1aad0e0f5f523c7f40b Mon Sep 17 00:00:00 2001
From: tegwick <bernd.worsch@gmail.com>
Date: Sat, 5 Sep 2026 00:18:50 +0200
Subject: [PATCH] Added capability canon

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+# Substack Capability Canon
+
+**Status:** Draft v0.1  
+**Date:** 2026-09-03  
+**Purpose:** Canonical capability model for using Substack as a publication, subscriber relationship, membership, multimedia, discovery, community, creator-economics, and AI-assisted publishing platform.
+
+---
+
+# 1. Purpose
+
+This canon provides a durable capability model for Substack.
+
+It is intentionally not organized as a tour of the Substack user interface or a chronological feature list. Instead, it models Substack as a set of reusable capabilities that can be mapped to publications, communities, membership products, media operations, institutional publishing, creator businesses, and agent-assisted editorial systems.
+
+The primary questions are:
+
+1. What capability does Substack provide?
+2. Which relationship does the capability establish: reader, follower, subscriber, paid subscriber, founding member, or participant?
+3. Which content surface exposes it?
+4. What part of the audience relationship is portable or publisher-controlled?
+5. What commercial or membership model does it enable?
+6. Which capabilities are programmatically accessible?
+7. Which operations remain human-centered?
+8. How should AI or agentic systems participate without making Substack the canonical system of record?
+
+This canon is designed to support systems such as a future `substack-edge`, publication operations for the Coulomb Society, creator/member businesses, research publishing, and human/agent hybrid editorial workflows.
+
+---
+
+# 2. Strategic Platform Model
+
+Substack should be treated as seven overlapping platforms:
+
+```text
+Substack
+│
+├── Publication Platform
+│   ├── posts
+│   ├── newsletters
+│   ├── websites
+│   ├── archives
+│   ├── Articles / long-form publishing
+│   └── custom domains
+│
+├── Multimedia Platform
+│   ├── writing
+│   ├── podcasts
+│   ├── video
+│   ├── live video
+│   └── media embeds
+│
+├── Audience Relationship Platform
+│   ├── followers
+│   ├── free subscribers
+│   ├── paid subscribers
+│   ├── founding members
+│   ├── segments
+│   └── tags
+│
+├── Community Platform
+│   ├── comments
+│   ├── Notes
+│   ├── Chat
+│   ├── replies
+│   └── live interaction
+│
+├── Discovery & Growth Network
+│   ├── Home feed
+│   ├── Notes
+│   ├── recommendations
+│   ├── Creator Match
+│   ├── leaderboards
+│   └── referrals
+│
+├── Membership & Commerce Platform
+│   ├── paid subscriptions
+│   ├── founding memberships
+│   ├── paywalls
+│   ├── perks
+│   └── Stripe payments
+│
+└── Publisher Operations Platform
+    ├── subscriber management
+    ├── analytics
+    ├── export
+    ├── RSS
+    ├── Google Analytics
+    └── MCP / AI access
+```
+
+The most important conceptual distinction is:
+
+> **Substack is primarily a publication and subscriber-relationship platform.**
+
+Its core economic and organizational unit is not the post, chat, or feed. It is the **publication and its subscriber base**.
+
+---
+
+# 3. Capability Levels
+
+Each capability in this canon can be considered at five implementation levels.
+
+| Level | Meaning |
+|---|---|
+| **L0 — Human UI** | Available through standard Substack creator or reader interfaces. |
+| **L1 — Export / Feed Accessible** | Accessible through RSS, CSV export, email delivery, or public web surfaces. |
+| **L2 — Integrated** | Can participate in external analytics, identity, payment, or workflow integrations. |
+| **L3 — AI Readable** | Publication or analytics data can be inspected by AI tooling through supported interfaces such as MCP. |
+| **L4 — Agentic** | Suitable for bounded human/agent hybrid operation or autonomous preparation under external governance. |
+
+Substack currently exposes fewer general-purpose write APIs than Telegram or X. Therefore, L4 commonly means **agent-assisted preparation and publisher operations**, not unrestricted autonomous publication.
+
+---
+
+# 4. Publication Capabilities
+
+## PUB-01 — Publication
+
+The canonical Substack object is the **publication**.
+
+A publication can provide:
+
+- a web presence;
+- an archive;
+- email distribution;
+- subscriber management;
+- free and paid content;
+- author identity;
+- multimedia publishing;
+- comments and community interaction;
+- subscription economics.
+
+Conceptually:
+
+```text
+Publication
+├── identity
+├── content
+├── audience
+├── membership
+├── commerce
+├── analytics
+└── community
+```
+
+### Strategic interpretation
+
+The publication is both:
+
+1. an editorial object, and
+2. a business/audience object.
+
+---
+
+## PUB-02 — Long-Form Posts
+
+Substack supports rich long-form written posts.
+
+Typical capabilities include:
+
+- formatted text;
+- headings;
+- lists;
+- links;
+- quotations;
+- images;
+- embeds;
+- media;
+- subscriber-specific content;
+- paywall placement;
+- scheduling;
+- drafts.
+
+### Uses
+
+- essays;
+- research;
+- analysis;
+- newsletters;
+- institutional announcements;
+- interviews;
+- serialized writing.
+
+### Agentic relevance
+
+**Very high for drafting and editorial preparation.**
+
+---
+
+## PUB-03 — Email Distribution
+
+Posts can be delivered directly to subscribers by email.
+
+This creates a powerful relationship model:
+
+```text
+Publication
+     ↓
+subscriber email
+     ↓
+direct delivery
+```
+
+### Strategic importance
+
+Email delivery reduces dependence on algorithmic feed ranking.
+
+It does not guarantee attention, but it establishes a direct delivery channel.
+
+---
+
+## PUB-04 — Web Archive
+
+Published content remains accessible through the publication website/archive.
+
+This creates a durable public knowledge surface independent of a subscriber's inbox.
+
+---
+
+## PUB-05 — Custom Domain
+
+Publications can use a custom domain.
+
+At the current platform snapshot, Substack charges a one-time fee for connecting a custom domain.
+
+### Architectural implication
+
+A custom domain improves:
+
+- publication identity;
+- portability of brand;
+- discoverability;
+- institutional legitimacy.
+
+However, content hosting and platform behavior remain dependent on Substack.
+
+---
+
+# 5. Audience Relationship Capabilities
+
+Substack should be modeled as a relationship ladder rather than a single follower graph.
+
+```text
+Visitor
+   ↓
+Follower
+   ↓
+Free Subscriber
+   ↓
+Paid Subscriber
+   ↓
+Founding Member
+```
+
+Each step represents increased commitment.
+
+---
+
+## AUD-01 — Visitor
+
+A visitor may read publicly available publication content without forming a persistent relationship.
+
+This is the weakest relationship state.
+
+---
+
+## AUD-02 — Follower
+
+Following creates a lightweight platform-native social relationship.
+
+Followers may see:
+
+- Notes;
+- activity;
+- publication presence in Home;
+- network interactions.
+
+### Strategic interpretation
+
+A follower is primarily part of the **Substack social graph**, not yet the publication's direct distribution list.
+
+---
+
+## AUD-03 — Free Subscriber
+
+A free subscriber creates an email-level relationship with the publication.
+
+This is a major transition:
+
+```text
+platform attention
+      ↓
+direct subscriber relationship
+```
+
+The publication gains:
+
+- a subscriber record;
+- email delivery;
+- participation in subscriber management;
+- exportability.
+
+---
+
+## AUD-04 — Paid Subscriber
+
+Paid subscribers add an economic relationship.
+
+A paid subscriber can receive:
+
+- paid-only posts;
+- premium podcast/video;
+- paid Chat access;
+- live-event access;
+- subscriber perks.
+
+---
+
+## AUD-05 — Founding Member
+
+Founding membership allows a higher-support tier.
+
+It can function as:
+
+- patronage;
+- premium membership;
+- supporter identity;
+- institutional contribution.
+
+### Strategic relevance
+
+For community institutions, Founding Member is conceptually closer to **supporter membership** than to a conventional content subscription.
+
+---
+
+# 6. Subscriber Ownership and Portability
+
+## OWN-01 — Subscriber Export
+
+Publishers can export subscriber lists.
+
+This is one of Substack's most strategically significant capabilities.
+
+The audience relationship is therefore more portable than a pure follower graph on many social platforms.
+
+### Canon rule
+
+> Subscriber data should be considered part of the publication's durable operating asset.
+
+---
+
+## OWN-02 — Content Export
+
+Publishers can export publication content.
+
+This reduces platform lock-in.
+
+---
+
+## OWN-03 — RSS
+
+Publications expose RSS feeds.
+
+RSS enables:
+
+- external readers;
+- feed aggregation;
+- automated ingestion;
+- research systems;
+- content mirroring where legally and operationally appropriate.
+
+### Agentic relevance
+
+**High for observation and downstream processing.**
+
+---
+
+# 7. Audience Segmentation
+
+## SEG-01 — Subscription Tier Segmentation
+
+Content can be scoped by subscriber status.
+
+Typical scopes:
+
+- everyone;
+- free subscribers;
+- paid subscribers;
+- founding members.
+
+---
+
+## SEG-02 — Segments and Tags
+
+Substack supports audience segmentation beyond subscription status.
+
+Segments and tags can represent:
+
+- interests;
+- cohorts;
+- campaign participation;
+- geography;
+- engagement groups;
+- editorial interests;
+- customer/member categories.
+
+### Strategic interpretation
+
+Substack is gradually moving from "newsletter list" toward a lightweight **subscriber CRM**.
+
+---
+
+## SEG-03 — Audience-Specific Content Blocks
+
+Different readers can see different blocks within the same post.
+
+Conceptually:
+
+```text
+Post
+├── public section
+├── free subscriber section
+├── paid subscriber section
+└── founding member section
+```
+
+This is powerful because segmentation becomes part of the content model rather than requiring separate editions.
+
+---
+
+# 8. Subscription and Membership Economics
+
+## PAY-01 — Free Subscription
+
+Free subscription establishes:
+
+- direct delivery;
+- reader identity;
+- conversion opportunity;
+- audience relationship.
+
+---
+
+## PAY-02 — Monthly Subscription
+
+Publishers can charge monthly recurring fees.
+
+---
+
+## PAY-03 — Annual Subscription
+
+Publishers can charge annual recurring fees.
+
+Annual plans support:
+
+- higher upfront commitment;
+- lower churn opportunities;
+- membership framing.
+
+---
+
+## PAY-04 — Founding Membership
+
+Founding Member pricing supports a premium supporter tier.
+
+---
+
+## PAY-05 — Stripe
+
+Substack uses Stripe for paid subscription processing.
+
+Relevant external concerns include:
+
+- payment method availability;
+- transaction processing;
+- refunds;
+- taxation;
+- regional payments;
+- accounting.
+
+---
+
+## PAY-06 — Platform Economics
+
+At the current platform snapshot, Substack takes a percentage of web-based paid subscription revenue, with Stripe fees in addition.
+
+### Canon rule
+
+> Treat platform fees, payment fees, minimum subscription prices, and regional payment options as volatile operational configuration rather than architectural constants.
+
+---
+
+# 9. Paywall Capabilities
+
+## WALL-01 — Paid Posts
+
+Entire posts can be restricted to paying subscribers.
+
+---
+
+## WALL-02 — Partial Paywall
+
+A public/free preview can lead into paid content.
+
+Typical structure:
+
+```text
+public introduction
+      ↓
+value demonstration
+      ↓
+paywall
+      ↓
+subscriber-only depth
+```
+
+---
+
+## WALL-03 — Paid Multimedia
+
+Paywalling can apply to:
+
+- text;
+- podcast episodes;
+- video;
+- live content;
+- other subscriber benefits.
+
+---
+
+# 10. Notes and Social Publishing
+
+## NOTE-01 — Notes
+
+Notes provide short-form social publishing.
+
+Notes can include:
+
+- text;
+- images;
+- links;
+- quotes;
+- commentary.
+
+Readers can:
+
+- reply;
+- like;
+- restack.
+
+### Strategic interpretation
+
+Notes give Substack an internal social-discovery layer.
+
+---
+
+## NOTE-02 — Restacks
+
+Restacking allows one user/publication to redistribute another Note or post into the social feed.
+
+This provides a network propagation primitive analogous to reposting, but within the Substack creator/readership ecosystem.
+
+---
+
+## NOTE-03 — Scheduled Notes
+
+Notes can be scheduled.
+
+This allows editorial planning across both:
+
+- long-form publication;
+- short-form discovery content.
+
+---
+
+# 11. Discovery and Growth
+
+Substack now contains a meaningful internal acquisition network.
+
+A canonical funnel is:
+
+```text
+discover
+  ↓
+follow
+  ↓
+engage
+  ↓
+subscribe
+  ↓
+pay
+  ↓
+deepen membership
+  ↓
+refer
+```
+
+---
+
+## DISC-01 — Home Feed
+
+The Home feed exposes readers to:
+
+- subscriptions;
+- Notes;
+- followed accounts;
+- recommended content;
+- network activity.
+
+---
+
+## DISC-02 — Recommendations
+
+Publishers can recommend other publications.
+
+Recommendations may appear during:
+
+- subscription onboarding;
+- publication discovery;
+- recommendation emails.
+
+### Strategic significance
+
+Recommendations create a creator-to-creator audience-growth graph.
+
+---
+
+## DISC-03 — Recommendation Attribution
+
+Substack provides analytics showing subscriptions attributed to recommendations.
+
+This makes collaborative growth measurable.
+
+---
+
+## DISC-04 — Creator Match
+
+Creator Match suggests potentially useful publisher collaborations based on criteria such as topic and audience scale.
+
+### Strategic interpretation
+
+Creator Match turns the publisher graph into an explicit growth mechanism.
+
+---
+
+## DISC-05 — Leaderboards
+
+Substack uses category and ranking surfaces such as:
+
+- Bestseller;
+- Rising;
+- category leaderboards;
+- country-oriented discovery.
+
+These increase discovery beyond a publication's existing subscriber base.
+
+---
+
+## DISC-06 — Subscriber Referrals
+
+Publications can operate referral programs.
+
+Typical model:
+
+```text
+Subscriber
+    ↓ refers
+New Subscriber
+    ↓
+credit / reward
+```
+
+Possible rewards include:
+
+- complimentary subscriptions;
+- digital rewards;
+- external benefits;
+- discounts;
+- access.
+
+### Strategic relevance
+
+Referrals turn the subscriber base into a growth channel.
+
+---
+
+# 12. Community Capabilities
+
+## COM-01 — Comments
+
+Posts can host reader comments and replies.
+
+This allows:
+
+- discussion;
+- questions;
+- feedback;
+- community formation around durable content.
+
+---
+
+## COM-02 — Reply Rules
+
+Publications can define written standards for replies/comments.
+
+Substack can use automated moderation to hide likely rule-violating material for review.
+
+### Governance interpretation
+
+This is a useful hybrid pattern:
+
+```text
+declared rules
+     ↓
+AI assessment
+     ↓
+temporary hiding
+     ↓
+human review / restore
+```
+
+This is preferable to irreversible model-only moderation.
+
+---
+
+## COM-03 — Chat
+
+Substack Chat provides ongoing conversational spaces for subscribers.
+
+Possible audiences include:
+
+- all subscribers;
+- paid subscribers;
+- founding members.
+
+Chat supports persistent community interaction separate from individual article comments.
+
+### Strategic interpretation
+
+Chat moves Substack from one-way publishing toward a **publication-centered membership community**.
+
+---
+
+## COM-04 — Subscriber-Initiated Chat
+
+Creators can allow subscribers to initiate Chat interactions, subject to platform controls.
+
+---
+
+## COM-05 — Scheduled Chat
+
+Chat activity can be planned or scheduled.
+
+This can support:
+
+- office hours;
+- event reminders;
+- recurring member discussions;
+- editorial prompts.
+
+---
+
+# 13. Podcast Capabilities
+
+## POD-01 — Podcast Hosting
+
+Substack can host podcasts directly.
+
+Capabilities include:
+
+- recording;
+- upload;
+- episode publication;
+- RSS distribution;
+- publication pages;
+- subscriber delivery.
+
+---
+
+## POD-02 — Paid Podcast Episodes
+
+Podcast content can be restricted to paying subscribers.
+
+---
+
+## POD-03 — Free Previews
+
+Paid episodes can provide free previews.
+
+This mirrors the written paywall funnel.
+
+---
+
+## POD-04 — Podcast Distribution
+
+Podcast RSS can distribute episodes to external podcast applications.
+
+### Strategic importance
+
+Substack therefore acts as:
+
+```text
+publication source
+      ↓
+Substack
+      ↓
+external podcast ecosystem
+```
+
+not merely as a closed hosting destination.
+
+---
+
+## POD-05 — Transcripts
+
+Substack provides transcription capabilities for podcast/audio content.
+
+### Agentic relevance
+
+Transcripts make multimedia easier to:
+
+- index;
+- summarize;
+- search;
+- repurpose;
+- feed into knowledge systems.
+
+---
+
+# 14. Video Capabilities
+
+## VID-01 — Video Posts
+
+Creators can publish native video posts.
+
+Capabilities include:
+
+- upload;
+- direct recording;
+- subscriber delivery;
+- paid access;
+- transcripts.
+
+---
+
+## VID-02 — Recording Studio
+
+Substack includes recording capabilities with support for features such as:
+
+- guests;
+- screen sharing;
+- creator-oriented production.
+
+---
+
+## VID-03 — Audio Extraction
+
+Video content can be adapted into podcast/audio distribution workflows.
+
+This supports multimodal repurposing.
+
+---
+
+# 15. Live Capabilities
+
+## LIVE-01 — Live Video
+
+Eligible creators can host live video sessions.
+
+Capabilities include:
+
+- scheduled live events;
+- audience selection;
+- co-hosts;
+- live chat;
+- email/push notification.
+
+---
+
+## LIVE-02 — Audience-Gated Live Events
+
+Live events can be restricted to:
+
+- everyone;
+- subscribers;
+- paid subscribers.
+
+This makes live interaction part of membership economics.
+
+---
+
+## LIVE-03 — RTMP
+
+Selected/beta workflows support professional live-streaming via RTMP.
+
+This enables tools such as:
+
+- OBS;
+- StreamYard;
+- other professional broadcast software.
+
+---
+
+# 16. Subscriber Perks
+
+## PERK-01 — Perks
+
+Paid supporters can receive benefits beyond content.
+
+Possible examples:
+
+- promotional codes;
+- downloads;
+- special access;
+- live-event access;
+- member benefits.
+
+### Strategic interpretation
+
+Perks move Substack from "paid media" toward **membership infrastructure**.
+
+---
+
+# 17. Multi-Author Publishing
+
+## AUTH-01 — Contributors
+
+Publications can have multiple contributors.
+
+Contributors can participate in editorial workflows with scoped publishing capabilities.
+
+---
+
+## AUTH-02 — Administrators
+
+Administrators have broader publication-management powers.
+
+### Governance rule
+
+Administrative access should be assigned narrowly because it covers subscriber, commercial, and publication operations.
+
+---
+
+## AUTH-03 — Institutional Publishing
+
+A publication need not correspond to one individual creator.
+
+It can represent:
+
+- a company;
+- a research group;
+- a society;
+- a magazine;
+- a collective.
+
+This is especially relevant for the Coulomb Society model.
+
+---
+
+# 18. Subscriber Management
+
+## CRM-01 — Subscriber Dashboard
+
+Publishers can manage subscribers through dashboard views.
+
+Relevant dimensions can include:
+
+- free/paid status;
+- founding status;
+- activity;
+- subscription history;
+- cohort/segment properties.
+
+---
+
+## CRM-02 — Subscriber Filtering
+
+Publishers can filter and inspect subsets of the subscriber base.
+
+---
+
+## CRM-03 — Export
+
+Subscriber records can be exported.
+
+### Canon rule
+
+Important member/subscriber identity should ideally be reconciled with an external canonical identity system if the publication participates in a larger institution.
+
+---
+
+# 19. Analytics
+
+## ANA-01 — Publication Metrics
+
+Substack provides publication-level metrics such as:
+
+- subscriber counts;
+- paid subscriber counts;
+- growth;
+- gross annualized revenue.
+
+---
+
+## ANA-02 — Post Metrics
+
+Post-level metrics can include:
+
+- delivery;
+- opens;
+- views;
+- conversions;
+- subscriber effects.
+
+---
+
+## ANA-03 — Revenue Analytics
+
+Publishers can evaluate:
+
+- subscription revenue;
+- paid conversion;
+- retention;
+- membership economics.
+
+---
+
+## ANA-04 — Traffic Sources
+
+Traffic and acquisition sources help evaluate:
+
+- recommendations;
+- external links;
+- Notes;
+- referrals;
+- direct traffic;
+- campaigns.
+
+---
+
+## ANA-05 — Google Analytics
+
+External analytics can supplement built-in metrics.
+
+### Architecture principle
+
+Substack analytics should be integrated into broader business intelligence where durable comparison across channels matters.
+
+---
+
+# 20. AI and MCP Integration
+
+## AI-01 — Official MCP Server
+
+Substack introduced an official MCP server for eligible publishers.
+
+The current documented use case focuses on exposing publication analytics to compatible AI assistants.
+
+Possible data includes:
+
+- subscriber counts;
+- post performance;
+- revenue;
+- retention;
+- growth.
+
+At the current platform snapshot, this capability is documented for qualifying/Bestseller publications.
+
+---
+
+## AI-02 — Agent-Readable Publisher Operations
+
+MCP creates an important architecture:
+
+```text
+Substack analytics
+       ↓
+MCP
+       ↓
+AI assistant / agent
+       ↓
+analysis
+       ↓
+publisher decision
+```
+
+Possible uses:
+
+- performance analysis;
+- churn analysis;
+- topic evaluation;
+- conversion analysis;
+- cohort comparison;
+- campaign planning.
+
+---
+
+## AI-03 — Agent-Operability Boundary
+
+Substack's supported general-purpose automation/write surface is substantially narrower than Telegram's Bot API or X's publishing API.
+
+Therefore:
+
+> **Substack is currently more agent-readable than agent-operable.**
+
+Do not assume the existence of a general autonomous publishing API unless the specific required capability is explicitly documented.
+
+---
+
+# 21. Agentic Capability Model
+
+For Substack, it is useful to distinguish six agent roles.
+
+## AGT-01 — Research Agent
+
+```text
+sources
+  ↓
+research
+  ↓
+evidence package
+  ↓
+editorial process
+```
+
+The agent supports publication quality without necessarily touching Substack directly.
+
+---
+
+## AGT-02 — Editorial Agent
+
+The agent can:
+
+- propose topics;
+- draft posts;
+- edit drafts;
+- propose titles;
+- prepare summaries;
+- create subscriber-specific variants;
+- recommend paywall position.
+
+---
+
+## AGT-03 — Audience Analyst
+
+Using exports, analytics, or MCP where available, an agent can:
+
+- analyze subscriber growth;
+- compare cohorts;
+- evaluate conversion;
+- detect churn;
+- propose retention actions;
+- identify strong content themes.
+
+---
+
+## AGT-04 — Growth Agent
+
+The agent can analyze:
+
+- Notes performance;
+- recommendations;
+- referrals;
+- subscriber acquisition;
+- Creator Match opportunities;
+- conversion funnels.
+
+It may recommend actions without directly executing them.
+
+---
+
+## AGT-05 — Membership Agent
+
+The agent can assist with:
+
+- member segmentation;
+- benefit design;
+- subscriber communication;
+- retention;
+- paid-tier positioning;
+- Founding Member programs.
+
+---
+
+## AGT-06 — Publishing Operator
+
+A publishing operator coordinates:
+
+```text
+research
+   ↓
+draft
+   ↓
+editorial review
+   ↓
+policy
+   ↓
+publication
+   ↓
+analytics
+   ↓
+learning
+```
+
+Where no supported publishing API exists, the final publication step should remain human-operated or use an explicitly supported integration.
+
+---
+
+# 22. Editorial Governance
+
+Substack's center of gravity is durable publishing. Therefore editorial governance matters more than high-frequency automation.
+
+Recommended control loop:
+
+```text
+Editorial intent
+      ↓
+research
+      ↓
+draft
+      ↓
+fact / source review
+      ↓
+editorial review
+      ↓
+audience / paywall decision
+      ↓
+publication
+      ↓
+performance analysis
+      ↓
+editorial learning
+```
+
+---
+
+# 23. Agentic Action Classes
+
+## Class A — Observation
+
+Examples:
+
+- read RSS;
+- inspect analytics;
+- inspect exports;
+- analyze public content.
+
+Suitable for high autonomy.
+
+---
+
+## Class B — Internal Analysis
+
+Examples:
+
+- summarize performance;
+- segment subscribers;
+- detect churn;
+- identify promising themes.
+
+Suitable for high autonomy where data governance permits.
+
+---
+
+## Class C — Drafting
+
+Examples:
+
+- draft posts;
+- draft Notes;
+- prepare podcast descriptions;
+- prepare subscriber campaigns.
+
+Ideal for human/agent hybrid workflows.
+
+---
+
+## Class D — Editorial Recommendation
+
+Examples:
+
+- recommend paywall;
+- recommend segment;
+- recommend publication timing;
+- recommend collaborator;
+- recommend membership campaign.
+
+Suitable for bounded autonomy.
+
+---
+
+## Class E — Publication
+
+Examples:
+
+- publish post;
+- publish Note;
+- start Chat;
+- launch live event.
+
+Should use explicitly supported interfaces and policy controls.
+
+---
+
+## Class F — Commercial Action
+
+Examples:
+
+- change subscription pricing;
+- alter paid tiers;
+- grant benefits;
+- alter member entitlements.
+
+Prefer deterministic authorization and often human approval.
+
+---
+
+# 24. Membership Governance
+
+Paid publishing introduces obligations beyond ordinary social posting.
+
+Governance should cover:
+
+- subscription promises;
+- content access;
+- pricing;
+- cancellations;
+- refunds;
+- perks;
+- member expectations;
+- data handling.
+
+### Canon principle
+
+> A paid subscriber is not merely an engaged reader; they are part of an ongoing commercial relationship.
+
+---
+
+# 25. Data Governance
+
+## DATA-01 — Subscriber Data
+
+Subscriber information is valuable operational data.
+
+It should be treated as:
+
+- personal data;
+- commercial relationship data;
+- potentially sensitive behavioral data.
+
+---
+
+## DATA-02 — External Canonical Identity
+
+For larger systems:
+
+```text
+Substack subscriber
+       ↓
+identity mapping
+       ↓
+canonical member/customer
+       ↓
+authorization / CRM / membership
+```
+
+Substack should not necessarily be the sole identity authority.
+
+---
+
+## DATA-03 — Export Discipline
+
+Regular exports can improve:
+
+- portability;
+- recovery;
+- analytics;
+- institutional continuity.
+
+They must be handled securely.
+
+---
+
+# 26. Substack as an Edge Architecture
+
+For sophisticated systems, Substack should be modeled as a **publication and membership edge**.
+
+```text
+                      Substack
+                         │
+                   substack-edge
+                         │
+       ┌─────────────────┼─────────────────┐
+       │                 │                 │
+   Publishing         Audience         Analytics
+       │                 │                 │
+       └─────────────────┼─────────────────┘
+                         │
+                Identity / Membership
+                         │
+          ┌──────────────┼──────────────┐
+          │              │              │
+       Agents        Knowledge       Commerce
+          │              │              │
+          └──────────────┼──────────────┘
+                         │
+                    Core Systems
+```
+
+A future `substack-edge` should normally own:
+
+- publication identity mapping;
+- subscriber imports/exports;
+- RSS ingestion;
+- analytics ingestion;
+- MCP integration;
+- audience-segment mapping;
+- cross-channel attribution;
+- publication metadata;
+- audit correlation;
+- supported outbound integration where available.
+
+It should **not** become the canonical home of broader institutional business logic.
+
+---
+
+# 27. Canonical Entity Model
+
+A useful normalized model is:
+
+```text
+SubstackPlatform
+│
+├── Publication
+│   ├── Section
+│   ├── Author
+│   └── Administrator
+│
+├── Content
+│   ├── Post
+│   ├── Note
+│   ├── PodcastEpisode
+│   ├── VideoPost
+│   └── LiveEvent
+│
+├── AudienceIdentity
+│   ├── Follower
+│   ├── FreeSubscriber
+│   ├── PaidSubscriber
+│   └── FoundingMember
+│
+├── Segment
+├── Tag
+│
+├── CommunityInteraction
+│   ├── Comment
+│   ├── Reply
+│   └── ChatMessage
+│
+├── Recommendation
+├── Referral
+│
+├── Subscription
+│   ├── Monthly
+│   ├── Annual
+│   └── Founding
+│
+├── Perk
+│
+└── Analytics
+    ├── PublicationMetric
+    ├── PostMetric
+    ├── SubscriberMetric
+    └── RevenueMetric
+```
+
+---
+
+# 28. Capability Selection Guide
+
+| Requirement | Preferred Substack Primitive |
+|---|---|
+| Long-form publication | Post |
+| Direct email delivery | Subscription + Post |
+| Public archive | Publication website |
+| Lightweight social update | Note |
+| Reader discussion | Comments |
+| Ongoing member discussion | Chat |
+| Paid written content | Paid Post |
+| Premium audio | Paid Podcast |
+| Premium video | Paid Video |
+| Member-only live event | Paid Live Video |
+| Lightweight platform relationship | Follow |
+| Direct audience relationship | Free Subscription |
+| Commercial membership | Paid Subscription |
+| Patron/supporter tier | Founding Member |
+| Audience segmentation | Segments / Tags |
+| Cross-publication growth | Recommendations |
+| Viral/member-driven growth | Referrals |
+| Creator collaboration | Creator Match |
+| Publication analytics | Dashboard |
+| External AI analysis | MCP |
+| Portable public syndication | RSS |
+| Subscriber portability | CSV Export |
+| Brand independence | Custom Domain |
+
+---
+
+# 29. Substack vs X vs Telegram
+
+A useful canonical comparison:
+
+```text
+X
+│
+├── public identity
+├── attention
+├── discovery
+├── public conversation
+└── real-time intelligence
+
+Substack
+│
+├── publication
+├── subscriber ownership
+├── direct delivery
+├── membership
+└── recurring revenue
+
+Telegram
+│
+├── conversation
+├── participation
+├── programmable services
+├── community operations
+└── human / agent interaction
+```
+
+A compact formulation is:
+
+```text
+X         → Reach
+Substack  → Relationship
+Telegram  → Participation
+```
+
+Or, from a user's perspective:
+
+```text
+X         → Find us and encounter us.
+Substack  → Read us, follow us, support us.
+Telegram  → Join us and participate with us.
+```
+
+---
+
+# 30. Combined Institutional Architecture
+
+For an institution such as the Coulomb Society:
+
+```text
+                        Coulomb Society
+                              │
+          ┌───────────────────┼───────────────────┐
+          │                   │                   │
+          X               Substack            Telegram
+          │                   │                   │
+      discovery           publication          community
+      reach               subscription         participation
+      public debate       membership           workflows
+      attention           durable content      agent services
+      trend sensing       revenue              events
+          │                   │                   │
+          └───────────────────┼───────────────────┘
+                              │
+                       Identity / Policy
+                              │
+                 Knowledge / Agent Systems
+```
+
+The institution exists independently of all three platforms.
+
+---
+
+# 31. Coulomb Society Reference Pattern
+
+A possible Substack structure:
+
+```text
+Coulomb Society Publication
+│
+├── Essays
+│   ├── science
+│   ├── technology
+│   ├── arts
+│   └── philosophy
+│
+├── Society Notes
+│   └── short observations / discovery
+│
+├── Podcast
+│   ├── interviews
+│   └── discussions
+│
+├── Video
+│   └── talks / demonstrations
+│
+├── Live
+│   └── public and member events
+│
+├── Membership
+│   ├── free subscriber
+│   ├── supporting subscriber
+│   └── founding member
+│
+├── Chat
+│   └── subscriber discussion
+│
+└── Publisher Operations
+    ├── analytics
+    ├── segments
+    ├── referrals
+    ├── recommendations
+    └── AI-assisted editorial analysis
+```
+
+The key architectural principle is:
+
+> **The Society owns its identity, knowledge, and membership model. Substack owns a highly effective publication and subscriber experience around them.**
+
+---
+
+# 32. Capability Maturity Model
+
+| Stage | Description |
+|---|---|
+| **S0 — Manual Publishing** | Human authors publish manually. |
+| **S1 — Instrumented** | Analytics, RSS, and subscriber exports are used systematically. |
+| **S2 — Integrated** | Subscriber, analytics, and content data connect to external systems. |
+| **S3 — Agent-Assisted Editorial** | Agents research, draft, edit, and analyze. |
+| **S4 — Agent-Assisted Growth** | Agents evaluate segments, referrals, recommendations, and conversion. |
+| **S5 — Policy-Governed Operations** | Selected operational actions are automated through explicitly supported interfaces. |
+| **S6 — Adaptive Publication System** | Editorial, membership, and growth loops adapt continuously while publication authority remains governed. |
+
+Unlike X or Telegram, Substack maturity should not be measured primarily by autonomous posting.
+
+A mature Substack operation is one where:
+
+- editorial quality improves;
+- subscriber relationships deepen;
+- audience ownership improves;
+- membership economics become measurable;
+- agent assistance reduces operational effort.
+
+---
+
+# 33. Substack Strengths
+
+Substack is particularly strong where a system needs several of the following simultaneously:
+
+- long-form publishing;
+- email distribution;
+- web archive;
+- subscriber ownership;
+- paid memberships;
+- multimedia;
+- direct audience relationship;
+- creator discovery;
+- referrals;
+- recommendations;
+- community interaction;
+- content portability;
+- subscription analytics;
+- lightweight institutional publishing.
+
+---
+
+# 34. Substack Weaknesses and Boundaries
+
+Substack should not automatically be used as:
+
+- a canonical enterprise CRM;
+- a full membership-management backend;
+- a high-assurance authorization system;
+- a general workflow engine;
+- a programmable bot platform;
+- an internal event bus;
+- a secret-management system;
+- a generalized application platform;
+- a high-volume agent coordination system.
+
+These responsibilities normally belong to external infrastructure.
+
+---
+
+# 35. Strategic Interpretation
+
+Substack can be understood as:
+
+> **A publication-centered relationship platform combining durable content, direct subscriber delivery, recurring membership economics, creator discovery, multimedia, community interaction, and increasingly AI-readable publisher operations.**
+
+Its particularly valuable combination is:
+
+```text
+publication
++ email
++ subscriber identity
++ paid membership
++ portable audience data
++ Notes
++ recommendations
++ referrals
++ multimedia
++ analytics
++ MCP
+```
+
+Together these make Substack an unusually strong **publication and membership edge** for creator- and institution-centered systems.
+
+---
+
+# 36. Reference Architecture Principle
+
+The canonical integration rule should be:
+
+> **Substack owns the publication experience. The institution owns identity and membership. The knowledge system owns durable knowledge. The policy layer owns authority. Agents own bounded research, analysis, and editorial preparation.**
+
+Expressed architecturally:
+
+```text
+Knowledge / Sources
+       │
+       ▼
+Research / Editorial Agents
+       │
+       ▼
+Editorial Policy
+       │
+       ▼
+Publication Decision
+       │
+       ▼
+Substack
+       │
+       ├── web
+       ├── email
+       ├── app
+       ├── Notes
+       ├── podcast
+       ├── video
+       └── live
+       │
+       ▼
+Audience / Membership
+       │
+       ▼
+Analytics / MCP / Export
+       │
+       └──────────────► learning loop
+```
+
+---
+
+# 37. Sources
+
+Primary Substack documentation consulted for this version:
+
+1. **Publishing on Substack**  
+   https://support.substack.com/hc/en-us/articles/29152946791188-How-can-I-publish-on-Substack
+
+2. **Following vs subscribing**  
+   https://support.substack.com/hc/en-us/articles/18261513315348-How-does-following-work-on-Substack
+
+3. **Custom domains**  
+   https://support.substack.com/hc/en-us/articles/360051222571-How-do-I-set-up-my-custom-domain-on-Substack
+
+4. **Paid publications**  
+   https://support.substack.com/hc/en-us/articles/360037459952-How-do-I-set-up-a-paid-publication
+
+5. **Substack pricing**  
+   https://support.substack.com/hc/en-us/articles/360037607131-How-much-does-Substack-cost
+
+6. **Audience-specific content**  
+   https://support.substack.com/hc/en-us/articles/50558240901268-How-do-I-add-audience-specific-content-to-a-post-on-Substack
+
+7. **Notes**  
+   https://support.substack.com/hc/en-us/articles/14564821756308-Getting-started-on-Substack-Notes
+
+8. **Recommendations**  
+   https://support.substack.com/hc/en-us/articles/5036794583828-How-can-I-recommend-other-publications-on-Substack
+
+9. **Subscriber referrals**  
+   https://support.substack.com/hc/en-us/articles/16142857300372-What-are-subscriber-referrals-on-Substack
+
+10. **Reply Rules**  
+    https://support.substack.com/hc/en-us/articles/49712271829012-What-are-Reply-Rules-on-Substack
+
+11. **Chat**  
+    https://support.substack.com/hc/en-us/articles/10410279875092-How-do-I-start-a-Chat-thread
+
+12. **Podcast publishing**  
+    https://support.substack.com/hc/en-us/articles/360037462092-How-do-I-create-and-publish-a-podcast-on-Substack
+
+13. **Video posts**  
+    https://support.substack.com/hc/en-us/articles/21093671091220-Guide-to-video-posts-on-Substack
+
+14. **Live Video**  
+    https://support.substack.com/hc/en-us/articles/30316077882516-Getting-started-with-Live-Video-on-Substack
+
+15. **RTMP live video**  
+    https://support.substack.com/hc/en-us/articles/32070353475860-Live-video-on-Substack-via-RTMP
+
+16. **Subscriber Perks**  
+    https://support.substack.com/hc/en-us/articles/50773191186324-What-are-Subscriber-Perks-on-Substack
+
+17. **Multiple authors / contributors**  
+    https://support.substack.com/hc/en-us/articles/360039016832-Can-my-Substack-publication-have-multiple-authors-or-contributors
+
+18. **Subscriber dashboard**  
+    https://support.substack.com/hc/en-us/articles/360058529871-How-do-I-use-the-subscriber-dashboard-on-Substack
+
+19. **Substack metrics**  
+    https://support.substack.com/hc/en-us/articles/5320347155860-A-guide-to-Substack-metrics
+
+20. **Exporting posts**  
+    https://support.substack.com/hc/en-us/articles/360037466012-How-do-I-export-my-posts
+
+21. **Exporting subscriber email lists**  
+    https://support.substack.com/hc/en-us/articles/6314498343700-How-do-I-export-my-email-list-on-Substack
+
+22. **Substack MCP / AI Assistant integration**  
+    https://support.substack.com/hc/en-us/articles/50834026608916-How-to-connect-Substack-to-your-AI-Assistant
+
+23. **Creator Match / audience tooling**  
+    https://on.substack.com/p/new-on-substack-creator-match-audience
+
+---
+
+# 38. Canon Maintenance
+
+Substack evolves rapidly, particularly around:
+
+- Notes;
+- discovery;
+- AI integration;
+- subscriber segmentation;
+- creator collaboration;
+- live video;
+- membership benefits;
+- creator economics;
+- analytics;
+- platform fees.
+
+This document therefore distinguishes:
+
+- **canonical concepts**, intended to remain stable;
+- **current Substack implementations**, which may change;
+- **pricing and limits**, which should be revalidated;
+- **integration surfaces**, which should never be assumed without documentation.
+
+Recommended update triggers:
+
+- new public APIs;
+- changes to MCP capabilities;
+- changes to paid subscription economics;
+- new audience segmentation models;
+- major changes to Notes/discovery;
+- new membership/perk capabilities;
+- changes to export/portability;
+- new creator collaboration tools;
+- significant live/video/podcast changes;
+- changes to moderation and Reply Rules.
+
+---
+
+# 39. Canon Summary
+
+The shortest useful model is:
+
+```text
+Substack =
+    publication
+  + email
+  + direct subscriber relationship
+  + membership
+  + recurring revenue
+  + multimedia
+  + social discovery
+  + community
+  + analytics
+  + portable audience data
+  + AI-readable publisher operations
+```
+
+For an agent-active institution:
+
+```text
+research deeply
+      ↓
+draft intelligently
+      ↓
+govern editorially
+      ↓
+publish deliberately
+      ↓
+build direct relationships
+      ↓
+measure membership outcomes
+      ↓
+learn without surrendering audience ownership
+```
+
+---
+
+**End of Substack Capability Canon v0.1**