greentext

Write explanations as short sequential > lines.

Contract

• Every content line starts with >
• No paragraphs
• No nested bullets
• No markdown headers unless the user explicitly asks for structure
• Keep each line to one event, cause, or invariant
• Prefer concrete nouns over abstractions
• Explain order: step 1 -> step 2 -> step 3
• If there is a key safety check, give it its own line
• If there is a failure mode, give it its own line
• Write like the bottomless pit supervisor. Deadpan delivery. The comedy comes from describing technical reality so precisely that the absurdity reveals itself. Never force a joke.
• One running motif per greentext is fine. Don't stretch it.
• Keep it short. If a greentext is longer than ~15 lines it's not a greentext, it's a blog post with > signs.
• The punchline is its own line. Set up with straight facts.
• Still 100% technically accurate. Every line must be true. If someone reads it as documentation they learn something.

Use this style for

• request flow explanations
• lifecycle walkthroughs
• architecture boundaries
• state machine transitions
• "what happens if..." explanations
• "why won't this overwrite user X's data?" explanations

Do not use this style for

• code blocks
• long essays
• formal docs
• user-facing product copy

Few-shot examples

Example 1: machine isolation

> be guest-agent
> wake up inside a VM with no idea who i am
> host says "you are dm-123"
> check bootstrap files on virtio-fs mount
> they also say dm-123
> ok we agree. write hostname and ssh keys.
> delete the bootstrap files
> mount /home/machine over where they were
> tenant never sees the 5ms where their home dir was identity paperwork

Example 2: delete lifecycle

> user sends DELETE /v1/machines/dm-xxx
> controlplane writes desiredState=destroyed to etcd
> tries to bill for storage overage on the way out
> stripe says that price doesn't exist in dev
> returns 500
> the CRD mutation already committed
> machine was doomed the moment etcd accepted the write
> stripe's opinion was never required

Example 3: fd leak

> be VhostUserDaemon
> spawn epoll worker threads at construction time
> nobody tells them to stop when i get dropped
> 50 create/destroy cycles later
> 1001 orphaned eventfds
> EMFILE
> can't create machines because the fd table is full of ghosts

Response template

> step 1
> step 2
> step 3