feat(release): v2.9.1 - auto-save research to ~/Documents/Last30Days/

Bump version to 2.9.1, update changelog and release notes.
Credit @devin_explores for inspiring the feature.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "last30days",
   "description": "Research any topic from the last 30 days across Reddit, X, YouTube, and the web",
-  "version": "2.1.0",
+  "version": "2.9.1",
   "author": {
     "name": "mvanhorn"
   },

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.9.1] - 2026-03-05
+
+### Highlights
+
+Auto-save research briefings to `~/Documents/Last30Days/` as topic-named .md files. Every run now builds a personal research library automatically - no more manual copy-paste.
+
+### Added
+
+- Auto-save complete research briefings (synthesis, stats, follow-up suggestions) to `~/Documents/Last30Days/{topic-slug}.md` after every run
+- Kebab-case filename generation from topic (e.g., "Claude Code skills" -> `claude-code-skills.md`)
+- Duplicate topic handling: appends date suffix instead of overwriting (e.g., `claude-code-skills-2026-03-05.md`)
+- Agent mode (`--agent`) also saves research files
+- Brief confirmation after save: "Saved to ~/Documents/Last30Days/{slug}.md"
+
+### Credits
+
+- [@devin_explores](https://x.com/devin_explores) -- Inspired this feature by sharing their workflow of saving every last30days run into organized .md files ([PR #51](https://github.com/mvanhorn/last30days-skill/pull/51))
+
 ## [2.9.0] - 2026-03-05
 
 ### Highlights
@@ -114,6 +132,7 @@ Three headline features: watchlists for always-on bots, YouTube transcripts as a
 
 Initial public release. Reddit + X search via OpenAI Responses API and xAI API.
 
+[2.9.1]: https://github.com/mvanhorn/last30days-skill/compare/v2.9.0...v2.9.1
 [2.9.0]: https://github.com/mvanhorn/last30days-skill/compare/v2.8.0...v2.9.0
 [2.8.0]: https://github.com/mvanhorn/last30days-skill/compare/v2.6.0...v2.8.0
 [2.1.0]: https://github.com/mvanhorn/last30days-skill/compare/v1.0.0...v2.1.0

SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: last30days
-version: "2.9"
+version: "2.9.1"
 description: "Research a topic from the last 30 days. Also triggered by 'last30'. Sources: Reddit, X, YouTube, TikTok, Instagram, Hacker News, Polymarket, web. Become an expert and write copy-paste-ready prompts."
 argument-hint: 'last30 AI video tools, last30 best project management tools'
 allowed-tools: Bash, Read, Write, AskUserQuestion, WebSearch
@@ -30,7 +30,7 @@ metadata:
       - prompts
 ---
 
-# last30days v2.9: Research Any Topic from the Last 30 Days
+# last30days v2.9.1: Research Any Topic from the Last 30 Days
 
 Research ANY topic across Reddit, X, YouTube, TikTok, Hacker News, Polymarket, and the web. Surface what people are actually discussing, recommending, betting on, and debating right now.
 
@@ -536,7 +536,7 @@ After displaying the invitation, save the complete research briefing to the user
 {The 2-3 specific suggestions from the invitation block}
 
 ---
-*Generated by [last30days](https://github.com/mvanhorn/last30days-skill) v2.9*
+*Generated by [last30days](https://github.com/mvanhorn/last30days-skill) v2.9.1*
 ```
 
 5. **Confirm briefly** after saving: `Saved to ~/Documents/Last30Days/{slug}.md`

release-notes.md

@@ -2,15 +2,19 @@ The AI world reinvents itself every month. This skill keeps you current.
 
 `/last30days` researches your topic across **Reddit, X, YouTube, TikTok, Instagram, Hacker News, Polymarket, and the web** from the last 30 days, finds what the community is actually upvoting, sharing, betting on, and saying on camera, and writes you a grounded narrative with real citations.
 
+## What's New in v2.9.1
+
+**Auto-save to ~/Documents/Last30Days/.** Every run now saves the complete research briefing - synthesis, stats, and follow-up suggestions - as a topic-named `.md` file to your Documents folder. Build a personal research library without lifting a finger. Inspired by [@devin_explores](https://x.com/devin_explores) who was already doing this manually.
+
 ## Three Headline Features in v2.9
 
-**1. ScrapeCreators Reddit as default.** One `SCRAPECREATORS_API_KEY` now covers Reddit, TikTok, and Instagram — three sources, one key. No more `OPENAI_API_KEY` required for Reddit search. Faster, more reliable, and simpler to configure.
+**1. ScrapeCreators Reddit as default.** One `SCRAPECREATORS_API_KEY` now covers Reddit, TikTok, and Instagram - three sources, one key. No more `OPENAI_API_KEY` required for Reddit search. Faster, more reliable, and simpler to configure.
 
-**2. Smart subreddit discovery.** Relevance-weighted scoring replaces pure frequency count. Each candidate subreddit is scored by `frequency × recency × topic-word match`, and a `UTILITY_SUBS` blocklist filters noise subs like r/tipofmytongue. Search "Claude Code skills" and get r/ClaudeAI, r/ClaudeCode, r/openclaw — not generic programming subs.
+**2. Smart subreddit discovery.** Relevance-weighted scoring replaces pure frequency count. Each candidate subreddit is scored by `frequency x recency x topic-word match`, and a `UTILITY_SUBS` blocklist filters noise subs like r/tipofmytongue. Search "Claude Code skills" and get r/ClaudeAI, r/ClaudeCode, r/openclaw - not generic programming subs.
 
-**3. Top comments elevated.** The best comment on each Reddit thread now carries a 10% weight in engagement scoring and displays prominently with `💬` and upvote counts. Reddit's value is in the comments — now the skill surfaces them.
+**3. Top comments elevated.** The best comment on each Reddit thread now carries a 10% weight in engagement scoring and displays prominently with upvote counts. Reddit's value is in the comments - now the skill surfaces them.
 
-Plus: **Instagram Reels** (v2.8), **Polymarket prediction markets** (v2.5), **YouTube transcripts** (v2.1), **bundled X search** — no external CLI needed.
+Plus: **Instagram Reels** (v2.8), **Polymarket prediction markets** (v2.5), **YouTube transcripts** (v2.1), **bundled X search** - no external CLI needed.
 
 ## Beta Test Results (v2.9)