A tool for editing and publishing drafts on the Shakedown Shuffle Substack site through an existing logged-in browser session. It can update drafts and publish changes without emailing subscribers.

Use it to read drafts, repair links or other draft content, save edits, publish updates, and verify the result afterward.

It removes the need to edit posts manually while checking that the logged-in session and saved changes work.

substack — Skill by notforyou23

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/notforyou23/home23/substack

Any agent

npx skills add notforyou23/home23 --skill substack

Clone the repo

git clone --depth 1 https://github.com/notforyou23/home23

Made for: Claude Code, Codex.

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,204 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.01204
Opus 5	$0.00000	$0.00602
Sonnet 5	$0.00000	$0.00241
Haiku 4.5	$0.00000	$0.00120

Measured 2d ago against content hash 391c497ca5b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

substack scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (index.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

workspace/skills/substack/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Substack Skill

Programmatic Substack editing for Shakedown Shuffle (shakedownshuffle.substack.com). Born from the 2026-07-26 issue-02 backlink repair — the first automated Substack edit.

How it works

Auth: rides the logged-in session inside the dedicated Chrome profile /Users/jtr/.codex/browser-profiles/shakedown-publishing-v3. No tokens, no secrets — the session cookie IS the credential.
Chrome is launched on demand on CDP 127.0.0.1:9223 (the supervisor launchd job is intentionally disabled; this skill spawns Chrome itself and records a launch marker).
API: Substack's internal draft API, driven by same-origin fetch from page context via CDP Runtime.evaluate:
- GET /api/v1/drafts/{postId} → full draft incl. draft_body (stringified ProseMirror doc)
- PUT /api/v1/drafts/{postId} with {draft_body} → saves draft
- POST /api/v1/drafts/{postId}/publish with {send:false, share_automatically:false} → pushes changes live WITHOUT emailing subscribers
- GET /api/v1/post_management/published → post list (also used as the session probe)

Doctrine (non-negotiable)

Fail loud. Expired session, changed API contract, failed readback — every failure throws with an explicit FAIL LOUD: message. No silent degradation, no retry loops.
Backup before write. editDraft snapshots the full draft JSON to projects/shakedownshuffle/content/newsletter/source-receipts/ before any PUT. Rollback = restore draft_body from the backup and re-publish.
Append-only. editDraft only appends ProseMirror nodes. It never rewrites or deletes existing content.
Idempotent. editDraft requires an idempotencyMarker; if the marker already exists in the body, the edit is skipped.
No email without double confirmation. publish defaults to send:false. Emailing subscribers requires confirmSend:true AND confirmSendText exactly matching the post title. The skill also verifies email_sent_at stays null on no-email publishes and throws if Substack violates that.
Never kill a Chrome it didn't start. stopChrome only works with the launch marker.

Read the full file on GitHub · 82 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 82 lines · 0 tokens per session scan A 391c497ca5b6

Subscribe to this mod's changes

substack is a skill published in the GitHub repository notforyou23/home23 (11 stars, last pushed 7d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,204 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Browser automation Writing and docs

use-agent-browser-for-airi

Test AIRI display-model imports with agent-browser across stage-tamagotchi Electron, stage-web, and stage-pocket mobile web layouts. Use when uploading and verifying contributor-supplied Live2D ZIP, VRM, or MMD ZIP/PMX/PMD files through AIRI's model selector, including onboarding bypass, format-specific import…

moeru-ai/airi · 87 tokens

opencli-sitemap-author

Use when creating or maintaining OpenCLI site sitemaps: agent-facing navigation, page-state, action, workflow, API-reference, pitfall, and fallback knowledge for a website. Use after browser exploration discovers durable site context, when a sitemap is stale, or when promoting local site knowledge into the repo.

jackwener/OpenCLI · 67 tokens

debug-optimize-lcp

Guides debugging and optimizing Largest Contentful Paint (LCP) using Chrome DevTools MCP tools. Use this skill whenever the user asks about LCP performance, slow page loads, Core Web Vitals optimization, or wants to understand why their page's main content takes too long to appear. Also use when the user mentions…

ChromeDevTools/chrome-devtools-mcp · 99 tokens

pinchtab-mcp

Use this skill when a task requires browser automation through PinchTab's MCP server connected to a remote browser instance. Covers navigation, element interaction, data extraction, form filling, multi-step flows, and session management via MCP tools.

pinchtab/pinchtab · 52 tokens

traceway-setup

Analyze and instrument repositories for Traceway observability. Use when the user wants to plan, add, migrate, or verify Traceway or OpenTelemetry monitoring for backend, browser, full-stack, mobile or iOS, or AI-agent software, including project topology and user-approved setup-plan creation. Backends use OTLP/HTTP…

tracewayapp/traceway · 134 tokens

southwest

Search Southwest Airlines fares and points pricing via Patchright browser automation. SW is not in any GDS or API. Covers all fare classes, Companion Pass value, and fare drop monitoring.

borski/travel-hacking-toolkit · 40 tokens