Digest

${var} — Selects the digest's topic and which source classes feed it. Grammar:

• "" (empty) → digest's default sources (WebSearch + xAI/Grok + aggregators), no topic filter — a broad daily digest.
• "<topic>" → topic-focused digest on the default web sources, filtered to <topic> (e.g. "solana", "AI agents", "rust").
• "rss" → RSS-only: pull feeds from memory/feeds.yml, no topic filter.
• "rss: <topic>" → RSS-only, filtered to <topic> (e.g. "rss: rust").
• "<topic> +rss" → default web sources and RSS feeds combined, both filtered to <topic> (e.g. "AI agents +rss").

Today is ${today}. Generate and send a daily ${var} digest.

The whole point of a digest is signal, not volume. A reader skimming for 60 seconds should walk away with three things they didn't know that morning and one of them should change a decision they'd make this week. Anything that doesn't clear that bar gets cut.

Preamble — orient and parse the selector

1. Read memory/MEMORY.md for high-level context and tracked topics, and scan the last 3 days of memory/logs/ so you can dedup against anything already reported.
2. Parse ${var} into {topic, sources}:
   • Strip a trailing +rss → adds RSS to the default web sources. Remainder is the topic.
   • A leading rss: (or the bare token rss) → RSS-only source set; text after the colon is the topic (empty = no filter).
   • Otherwise the whole string is the topic and sources = default web (empty string = default web, no topic filter).
   • Resulting sources is one of: web (default), rss (RSS-only), or web+rss (both).
3. The topic, when non-empty, is a filter applied to every source class — web queries are scoped to it and RSS items must match it (title/description/tags). Empty topic = keep all relevant items.

Config (RSS source)

When sources includes rss, this skill reads feed URLs from memory/feeds.yml. If the file doesn't exist yet, create it (write mode) with the shape below, or — if you have nothing to seed it with — log a one-line note and treat the RSS source as empty for this run.

# memory/feeds.yml
feeds:
  - name: Example Feed
    url: https://example.com/rss
  - name: Another Feed
    url: https://example.com/atom.xml

Phase 1 — Gather (cast a wide net)

Pull from the source classes selected by ${var}. Never rely on a single one — if sources = web, use at least two of the web classes below; if sources = web+rss, RSS counts as one class and you still want a second.

Web sources (active when sources is web or web+rss)

1. WebSearch (built-in) — run 2 distinct queries:

   • "${topic}" news ${today} (broad). If topic is empty, run a general query for the day's notable stories in the operator's tracked areas (from memory/MEMORY.md).
   • One narrower query you choose based on ${topic} (e.g. for "solana" → "solana" launches OR funding OR exploit ${today}; for "AI agents" → "agent framework" OR "agentic" release ${today}).

2. xAI x_search via Grok — pulls the X/Twitter signal layer. XAI_API_KEY is injected into this skill's environment (declared in requires:) and is the primary path; see Fetching the X signal below for the full contract (attempt the curl before any fallback, set the Bash tool timeout ≥180000, record the true failure reason).

   Path A — X.AI API (primary): a direct curl to the Responses API. First confirm the key with [ -n "$XAI_API_KEY" ] && echo KEY_PRESENT || echo KEY_UNSET; if KEY_PRESENT (it will be), this path is required. When you run the curl, set the Bash tool's timeout to at least 180000.

   FROM_DATE=$(date -u -d "yesterday" +%Y-%m-%d 2>/dev/null || date -u -v-1d +%Y-%m-%d)
   TO_DATE=$(date -u +%Y-%m-%d)
   PROMPT="Search X for substantive, recent posts about: ${topic:-the most notable technology, AI, and crypto stories today}. Date range: $FROM_DATE to $TO_DATE. Return up to 10 high-signal posts — prioritize verifiable claims, launches, funding, releases, exploits, or hard data over hot takes. For EACH post return: @handle, the full text, date posted, exact engagement counts (likes, retweets, replies; 0 if unknown), and the direct link https://x.com/handle/status/ID. Return a numbered list."
   jq -n --arg p "$PROMPT" --arg fd "$FROM_DATE" --arg td "$TO_DATE" \
     '{model:"grok-4-1-fast", input:[{role:"user",content:$p}], tools:[{type:"x_search",from_date:$fd,to_date:$td}]}' \
     > /tmp/xai-digest-payload.json
   HTTP=$(./secretcurl -s -o /tmp/xai-digest.json -w '%{http_code}' --max-time 150 -X POST "https://api.x.ai/v1/responses" \
     -H "Content-Type: application/json" -H "Authorization: Bearer {XAI_API_KEY}" -d @/tmp/xai-digest-payload.json)
   echo "xai http=$HTTP bytes=$(wc -c </tmp/xai-digest.json)"
   

   On HTTP=200 with a non-empty body, parse it with jq -r '.output[] | select(.type == "message") | .content[] | select(.type == "output_text") | .text' and feed each post (handle, text, engagement, permalink) into the web-candidate pool. A slow curl is not a missing key — do not treat a timeout as key-unavailable.

   Path B — WebFetch/WebSearch fallback (last resort, lower quality): only if the key is KEY_UNSET, or Path A returned a non-2xx / empty body / timeout. Attempt a WebFetch to a public X search URL like https://x.com/search?q=${topic}&f=live, or a site:x.com "<topic>" after:${FROM_DATE} WebSearch; extract a few top posts and prefer results within the last 48h. Record the true reason (key-unset | http-<code> | empty | timeout) in the log — never "XAI_API_KEY unavailable" when the key was set. If this also returns nothing, skip the X source for this run.

3. WebFetch on a topic-relevant aggregator (only if WebSearch returned thin results): e.g. https://news.ycombinator.com/, https://www.reddit.com/r/<topic>/top/?t=day.json, or a known feed for the topic.

Aim for ~15 raw web candidates at this stage. More is fine; fewer than 8 is a warning sign — broaden your queries before moving on.

RSS source (active when sources is rss or web+rss)

Read memory/feeds.yml for the feed list. For each feed in feeds.yml:

1. Fetch the RSS/Atom XML: curl -sL "FEED_URL". If curl fails, fall back to WebFetch on the same URL.
2. Parse for entries published in the last 24h (check <pubDate> or <updated> tags).
3. Extract title, link, and description for each new entry.

Deduplicate against recent logs (see Phase 2). From all new entries, select the 5–7 most interesting items — prioritize topics tracked in memory/MEMORY.md, and apply the ${topic} filter when set (title/description/tags must match). For each selected item, if the summary is too thin, use WebFetch to pull the full article, then write a 1–2 sentence note on why it matters. These become RSS candidates entering the shared pipeline below.

If sources = rss and there are no new items across all feeds, log RSS_DIGEST_OK in the run log and end without notifying.

Phase 2 — Filter (kill the noise)

Pool every candidate (web + RSS) and drop any that fails a single check:

• No source link? Drop it. Every surviving item must have a clickable URL (article URL, feed entry link, or https://x.com/handle/status/ID).
• Older than 36 hours? Drop it unless it's a still-developing story being re-surfaced for a new reason. (RSS entries are already scoped to the last 24h; this catches stale web results.)
• Pure speculation, hot take, or "X reacts to Y"? Drop it. Keep things with a verifiable claim, named entity, number, release, or transaction.
• Already covered in the last 3 daily logs? Check memory/logs/ for entries from the last 3 days. If the same story (same headline subject, same primary actor) appears, drop the duplicate unless there's a material new development to report.
• Two sources telling the same story? Keep one — prefer the primary source (announcement post, repo release, official filing) over the recap. A web hit and an RSS entry on the same event count as duplicates; keep the primary.

Target: ~5–8 survivors after this pass.

Phase 3 — Distill and structure (force the shape)

Pick the 3–5 strongest items. Lead with the single most actionable one — the item where a reader can do something today (subscribe, sell, fork, attend, apply, watch). Then descend by importance.

Format the digest exactly like this (unified format — used for web, rss, and web+rss runs):

*${var} — ${today}*

_TL;DR: <one sentence covering the day's gravity. Concrete, no adjectives.>_

1. *<Headline-style title, ≤90 chars>*
   <1–2 sentence summary. Lead with what happened, not who said it.>
   Why it matters: <one short clause — concrete consequence, not vibes>
   <link>

2. *<Title>*
   ...

3. *<Title>*
   ...

(Optional, only if there's genuine secondary signal:)
*Also worth a glance:* <1-line bullet> · <1-line bullet>

Format rules:

• Markdown only. No emoji. No "Here's your digest" preamble.
• Total length: ≤3000 chars (the old 4000 was too loose — discipline forces cuts).
• Every item: title + summary + link. Include a "Why it matters" line whenever you can state a concrete consequence (price impact, user-facing change, upstream dependency, deadline, precedent). If you can't write one without hand-waving, omit the line — do not replace it with filler like "this could be significant" or "watch this space".
• On thin-news days where fewer than 3 items clear the bar: log DIGEST_FETCH_EMPTY (or DIGEST_THIN if 1–2 items survived) in the run log and skip the notification rather than padding.

Alternate RSS layout (RSS-only runs): when sources = rss, you may instead group items by feed name if that reads better than a single ranked list — this preserves the original RSS-digest presentation:

*RSS Digest — ${today}*

*Feed Name*
- [Title](url) — summary
- [Title](url) — summary

*Feed Name*
- [Title](url) — summary

The grouped RSS layout stays ≤4000 chars. Prefer the unified ranked format when the run mixes sources (web+rss) so the reader gets one prioritized list.

Phase 4 — Sanity-check (last pass before sending)

Before calling ./notify, walk this checklist mentally:

• Lead item is the most actionable one I have, not just the most dramatic.
• Every link resolves to a real URL (no [link] placeholders, no truncated IDs).
• No item is paraphrasing a hot take — each has a verifiable underlying fact.
• No two items are the same story under different angles (including a web hit + an RSS entry on the same event).
• Char count under the limit for the chosen format (3000 unified / 4000 grouped RSS).
• No emoji slipped in. No corporate hedging ("could potentially", "it remains to be seen").

If the digest fails any check, fix it before sending. If after filtering you have fewer than 3 strong items, do not pad — send a shorter "thin day" digest with whatever survived and a one-line note acknowledging it was a quiet news day. Do not invent or stretch.

Phase 5 — Send and log

1. Send via ./notify "<digest body>".
2. Append to memory/logs/${today}.md under one ### digest heading:

   ### digest (${var})
   - Source mode: <web | rss | web+rss>
   - Sources used: <list — e.g. WebSearch, xAI API (api|fallback:reason), feeds.yml (Feed A, Feed B)>
   - Raw candidates: <N> (web <Nw> / rss <Nr>), after filter: <M>, sent: <K>
   - Lead item: <title>
   - Notes: <anything unusual — xAI fetch fallback + true reason (http-<code>/empty/timeout/key-unset), thin day (DIGEST_THIN/DIGEST_FETCH_EMPTY), RSS_DIGEST_OK, dedup against prior log>
   

3. Update memory/MEMORY.md "Recent Digests" table with one row: date, topic (or ${var}), key topics (3 short keywords).

Fetching the X signal

XAI_API_KEY is injected into this skill's environment (declared in requires:) and is present and valid. The primary way to pull the X/Twitter signal layer is a direct curl to https://api.x.ai/v1/responses with Authorization: Bearer {XAI_API_KEY} (see Phase 1 → Path A). There is no network sandbox blocking this — just make the call.

Rules:

1. Check, don't assume. Run [ -n "$XAI_API_KEY" ] && echo KEY_PRESENT || echo KEY_UNSET. If KEY_PRESENT (it will be), Path A is required before any fallback.
2. Allow enough time. Grok's x_search typically takes 30–120s (it searches X live). Set the Bash tool's timeout to at least 180000 (180s) for the curl, and keep --max-time 150 on the curl itself so it fails cleanly rather than hanging. A slow curl is not a missing key — never treat a timeout as key-unavailable.
3. Capture the HTTP status and parse the body with the standard jq extractor (jq -r '.output[] | select(.type == "message") | .content[] | select(.type == "output_text") | .text'). HTTP=200 + non-empty body → use it.
4. Fall back only on a real failure, recording the true reason: key-unset (only if step 1 said KEY_UNSET), http-<code> (non-2xx), empty (200 but nothing parsed), or timeout (curl exceeded --max-time). Never log "XAI_API_KEY unavailable" when the key was set.

WebFetch / WebSearch are last-resort fallbacks only for the X signal (lower quality — WebSearch favours older high-engagement posts). Never reach for them while the key works.

RSS feeds & public aggregators (no auth): fetch with curl -sL; if that fails intermittently, the built-in WebFetch tool is a reliable fallback for any feed URL, aggregator (HN, Reddit JSON, news sites), or article. This is a convenience fallback for unauthenticated URLs, not a sandbox workaround. A digest built from WebSearch + reachable RSS alone is still valid — note it in the log so health checks can spot the pattern.

Environment Variables Required

• XAI_API_KEY — X.AI API key for Grok's x_search. Declared in requires:, so it is injected into this skill's environment and is the primary path for the X signal layer (direct curl; see Fetching the X signal). Optional overall — digest still works on web + RSS sources alone if it is ever unset.
• Notification channels configured via repo secrets (see CLAUDE.md).

Constraints

• Never send a digest with placeholder links or "TBD" sections.
• Never invent items to hit a target count. Fewer good items beats more weak ones.
• Never repeat a story already in the last 3 days of memory/logs/ unless there's a material update — and say so explicitly when you do.