Plan: `/geoff-post` Slash Command + First Audio Blog Post
Implement the following plan:
Plan: /geoff-post Slash Command + First Audio Blog Post
Overview
Two deliverables:
- Create a reusable
/geoff-postslash command that transcribes audio and generates a Geoff-authored blog post - Use it (manually this first time) to produce a post from
content/blog/2026-01-21-claude-coinstructor.m4a, backdated to January 21
Part 1: Create /geoff-post Slash Command
File to Create
.claude/commands/geoff-post.md
Command Design
The command accepts an audio file path as $ARGUMENTS. Workflow:
- Transcribe — Run
uvx whisperx <file> --output_dir <scratchpad> --output_format txt(no--diarizeflag, so no speaker annotations) - Read transcript — Load the generated
.txtfile - Propose scope — Present title, summary, and key themes extracted from the transcript for Geoff to review before writing
- Write the post — Generate MDX at
content/blog/YYYY-MM-DD-slug.mdxwithauthor: geoff, deriving the date and slug from the audio filename (pattern:YYYY-MM-DD-slug.m4a) - Review — Present draft for iteration; do not commit
Allowed Tools
allowed-tools: Bash(uvx whisperx:*), Bash(date:*), Bash(wc:*)
Voice Guidelines (for Geoff posts)
These are transcription-based posts — the source is Geoff speaking. The command should:
- Preserve Geoff's natural voice and ideas from the audio
- Convert spoken language to clean written prose (remove filler, false starts, repetition)
- Keep the conversational, first-person tone
- Organize into logical sections with
##headings - Follow the same content rules as
/blog-post: no h1 in body, no emojis, technical details in<Details>blocks if needed
Part 2: Transcribe and Create First Blog Post
Step 1: Transcribe the Audio
uvx whisperx content/blog/2026-01-21-claude-coinstructor.m4a \
--output_dir <scratchpad> \
--output_format txt
This will produce a .txt transcript in the scratchpad directory. No speaker diarization needed (single speaker).
Step 2: Generate the Blog Post
Create content/blog/2026-01-21-claude-coinstructor.mdx with:
---
title: <derived from transcript content>
date: 2026-01-21
author: geoff
summary: <1-2 sentence summary>
---
The content should be the transcript converted to clean blog prose — organized into sections, with speech artifacts cleaned up, but preserving Geoff's voice and ideas.
Step 3: Review
Present the draft. Geoff takes over for content review and editing. Do not commit.
Verification
# Check post renders
curl -sk https://[local-hostname]/blog/2026-01-21-claude-coinstructor | grep -c "data-testid"
# TypeScript check
bunx turbo tsc --filter=@repo/web
If you need specific details from before exiting plan mode (like exact code snippets, error messages, or content you generated), read the full transcript at: ~/.claude/projects/-Users-challen-www-usingandunderstanding-ai/67c908c4-a896-4baf-b857-1e6e15f50d72.jsonl
I'll start by exploring the existing blog infrastructure and the /blog-post command to understand the patterns, then implement both parts.
Let me explore the existing blog setup and the /blog-post command.
Good. Now let me also read the third blog post and check for the audio file.
Good, the audio file exists (~23MB). Now let me create the slash command and start the transcription in parallel.
The slash command is created. The transcription failed because of a float16 compute type issue on this machine (likely CPU-only, no GPU). Let me retry with the appropriate compute type flag.
WhisperX has a PyTorch compatibility issue. Let me try using the --no_vad flag or using plain whisper instead.
I see there's a --vad_method silero option and --no_align flag. Let me try with silero VAD instead which might not have the same PyTorch issue.
The transcription succeeded. Let me read the transcript file and also update the command to include --vad_method silero --no_align --language en flags.
Good, I have the full transcript. Now let me update the slash command to include the correct whisperx flags, then mark that task complete and move on to the blog post.
Now let me write the blog post. The transcript covers Geoff talking about his collaboration with Claude to build this course, comparing it to his experience building infrastructure for CS 124 over many years. Here's the scope before I write:
Scope proposal:
- Title: "Claude, My Co-Instructor" (matching the slug
claude-coinstructor) - Summary: Reflections on building a course from scratch with an AI collaborator, and how it compares to years of doing it by hand.
- Key themes:
- Collaboration from the beginning — syllabus design, feedback integration, not just implementation
- The pain of course infrastructure by hand (CS 124: roster management, mail, years of crawling over glass)
- Letting Claude make design decisions (database choice, architecture) while Geoff brings the pedagogical vision
- The workflow: Geoff talks, Claude codes — no reading/writing/debugging code himself
- Specific examples: roster management, custom mail server, activity system
- Speed comparison: weeks vs. years to achieve similar infrastructure
- Leave out: The Django/South reminiscence details (too in-the-weeds), specific transcription errors ("Neomanic" = Nodemailer, "Bob" = "about", etc.)
Let me write the post now.
Now let me verify it renders and passes type checking.
Everything passes. Let me update the task.
Both deliverables are done. Here's a summary:
1. /geoff-post slash command — Created at .claude/commands/geoff-post.md. It:
- Takes an audio file path as
$ARGUMENTS - Transcribes via
uvx whisperxwith CPU-compatible flags (--compute_type int8 --vad_method silero --no_align --language en) - Includes FERPA filtering, scope proposal step, and voice guidelines that preserve Geoff's conversational tone
- Follows the same structure as
/blog-postbut adapted for transcription-based authoring
2. Blog post — Created at content/blog/2026-01-21-claude-coinstructor.mdx, backdated to January 21. The post covers:
- The collaboration starting before the code (syllabus design, Google Docs feedback)
- The pain of building course infrastructure by hand for CS 124 over years
- Letting Claude make design decisions (SQL database, deployment scripts) while Geoff brings pedagogical vision
- The workflow: Geoff talks, Claude codes
- Concrete examples: roster management, custom mail server, activity system
- The speed comparison: weeks vs. years
The post renders at /blog/2026-01-21-claude-coinstructor (HTTP 200) and TypeScript checks pass. Ready for your content review — not committed.
What do you think of the content? Suggestions?
(no content)
A few things I'd flag looking at it critically:
Title mismatch with content. "Co-Instructor" implies Claude is teaching alongside Geoff, but the transcript is almost entirely about Claude as a development partner — building infrastructure, making architecture decisions, writing code. Geoff doesn't really describe Claude co-teaching. Something closer to the actual relationship might work better: "Building a Course with Claude," "Claude, My Co-Builder," or leaning into the contrast that drives the post: the years-vs-weeks thing.
Repetitive middle. The "What Collaboration Feels Like" section restates what the surrounding sections already demonstrate through examples. "I bring vision, Claude implements" is said explicitly there, but also shown in the database section, the activity section, and the mail section. Cutting or heavily trimming that section would tighten the post without losing anything.
The mail story runs long. It's the best concrete anecdote in the transcript — Mailman frustrations, fear of mail protocols, asking Claude to just build one — but it takes up a disproportionate amount of the post. Could probably be about 60% of its current length and land just as well.
The ending is flat. "I'm excited to see where it goes" is faithful to the transcript but it's a generic closer. The strongest idea in the final section is the side-by-side comparison — eight years vs. weeks. That could be the ending beat rather than trailing off into looking forward.
One thing that works well: The "crawled over glass" thread from CS 124 through to the speed payoff gives the post real structure. That contrast is the spine of the piece.
Want me to do a tightening pass based on these, or do you want to give direction on any of them first?
Yeah, go ahead and do some editing while maintaining the tone of the original post. I do want to keep the title, since you're not only involved technically, but also with creating content and course policy decisions. That should become more clear as we go, even if it's perhaps not as clear in this post.
(no content)
Now let me also fold a bit of the collaboration-as-more-than-implementation idea into the "Bringing Vision" section, since we cut the standalone section but the point about Claude contributing to content decisions is worth keeping.
Let me verify the final version reads well.
Tighter. The "What Collaboration Feels Like" section is gone, the mail story is compressed, the ending lands on the concrete contrast instead of trailing off. The key content-decisions point is preserved in a short paragraph at the end of "Bringing Vision."
Let me verify it still renders.
Still rendering fine. Changes made:
- Cut "What Collaboration Feels Like" section entirely — its best point (Claude contributes to content, not just code) is now a short paragraph at the end of "Bringing Vision, Letting Claude Design"
- Compressed the mail story from 10 lines to 5 — keeps the arc (Mailman frustrations, fear of mail, asking Claude, it just works) without the implementation details
- Rewrote the ending — cuts the soft "excited to see where it goes" and instead ends on the sharpest line: "Eight years versus weeks. That's what having a collaborator who can actually write the code changes about building a course."
Man, that last line lands but is going to tend to annoy educators, many of whom can't code a lick. Why don't we say "having a collaborator who can write code almost instantly" or something like that, to emphasize the speed at which you're able to realize our vision.
Good catch — the original framing implied the bottleneck was ability to code, when the real point is speed of realization. This version keeps the punch but shifts emphasis to the velocity.
Can we add the sidebar navigation we use on the syllabus to blog entries? And to design documents? It should really probably the a default for MDX content unless disabled.
Good exploration results. The picture is clear: Prose is the simple wrapper (no TOC), ProseWithToc adds the sidebar with TableOfContents + ViewAsStudentWrapper + optional sidebarContent. The TOC extraction is runtime/DOM-based, so switching wrappers is all that's needed.
Let me read the key components to nail down the implementation details.
Let me also check what other pages use Prose to understand the full impact.
I have a clear picture of the full layout. Let me write the plan.