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sidewise: Instructions file for Claude Code

CLAUDE.md

sidewise CLAUDE.md is an instructions file for Claude Code from nulljosh/sidewise. It costs 1,118 tokens per session, scanned A, original, MIT.

A project instruction document for Sidewise, a news reader that collects articles from RSS feeds, which are regularly updated website feeds. It describes the app's architecture, feed sources, data parsing, and API output.

In plain words
What is it for?
Use it when developing or testing Sidewise, adding or checking news feeds, parsing article dates and links, or working on its stories API and Cloudflare Worker.
Why use it?
It gives a coding agent the project-specific context needed to change the right parts and preserve existing behavior. It also records checks for stale feeds and explains why publisher grouping affects bias results.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is nulljosh/sidewise's own configuration. It tells Claude Code how to work on sidewise itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything sidewise configures →

not rated 0repo changed 2mo ago A scan 1,118 tokens original MIT archived
View source ↗ nulljosh/sidewise sidewise.jaybulb.com
Reuse

Borrowing it

Nothing to install: this file belongs to nulljosh/sidewise. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/nulljosh/sidewise/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/nulljosh/sidewise

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

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README.md
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Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for sidewise CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/nulljosh/sidewise/claude-md"><img src="https://agentmods.dev/badge/instructions/nulljosh/sidewise/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,118 This file is loaded in full into every session.
When invoked 1,118 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01118 $0.01118
Opus 5.5 $0.00447 $0.00447
Sonnet 5.5 $0.00224 $0.00224
Haiku 4.5 $0.00112 $0.00112

Measured 2mo ago against content hash 0aa6a962e26d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sidewise CLAUDE.md 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 2mo ago.

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.

CLAUDE.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sidewise

RSS news reader across the feeds in src/feeds.js (incl. Hacker News, Fox, BBC, WSJ…). Flat Latest feed + Ground News-style bias view. sidewise.heyitsmejosh.com.

Architecture

Single Cloudflare Worker does everything. worker.js is routing + error handling only; the logic lives in src/ (feeds parse stories load mcp) so it can be tested without a Worker runtime. worker.js re-exports all of it, so check-feeds.mjs and tests import one path.

  • Fetches every RSS feed in FEEDS ( = [outlet, bias, url, publisher?] in src/feeds.js; add a source by appending a row, RSS 2.0 or Atom). publisher defaults to outlet and exists so one newsroom's two feeds (NY Post + NY Post Opinion) count as one voice, not two, counting outlets inflated bias bars and produced false blindspots. Run npm run feeds after adding one: it checks recency, not just item count, which is the only way to catch a "zombie" feed that still serves 200 OK from a frozen snapshot (CNN did exactly this for 3 years).
  • parseItems pulls title/link + a timestamp (pubDate/dc:date/published/updated, ts=0 when absent).
  • Returns two views in one /api/stories JSON payload:
    • latest: flat reverse-chron across all sources (dateless sinks to bottom), the default reader view.
    • stories: cluster() groups same-story headlines by title-keyword overlap (naive O(n²), see ponytail: comment, upgrade to embeddings if quality matters), tags bias, flags blindspots (covered by one side only).
  • Serves the static site (via Workers Static Assets). public/index.html is the marketing page; public/reader.html is the actual web app. from the same deploy, no separate Pages project. Frontend defaults to Latest with a source picker + search; tabs switch to the bias view.
  • The feed pull (not the response) is cached ~2 min via the Cache API under a constant key; responses go out no-store because the zone CDN ignores query strings. A fresh deploy still serves the previous pull until that TTL expires, don't panic if new fields are missing for a couple of minutes.
  • Failure handling: each feed reports {ok, items, error}; a pull that loses more than half its feeds is degraded and falls back to the last good pull (stale: true) rather than serving a half-empty feed, and never overwrites it. /api/health 503s when degraded.

Read the full file on GitHub · 55 lines

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.

  1. 2mo ago Changed · -2 tokens per session 0aa6a962e26d
  2. 2mo ago First seen · 55 lines · 1,120 tokens per session scan A 4992a5f519ad

Subscribe to this mod's changes

sidewise CLAUDE.md is an instructions file published in the GitHub repository nulljosh/sidewise (0 stars, last pushed 19d ago), licensed MIT. It adds 1,118 tokens to every session, about $0.0045 per session on Opus 5.5. 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 2026-08-31.

apicloudflare-workersmcpmcp-servermedia-biasmodel-context-protocol
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