nyx.

What makes it special

• -the loop

  No framework underneath

  Plain Python and a single dependency. The harness streams each reply token by token, runs the tools, trims its own memory and lets you cut a reply off mid-sentence: the work a framework does out of sight, done where you can read it.

• -the guard

  It knows when to step back

  If someone talks about ending their life or harming themselves, Nyx stops offering exercises and points to people who can help: Samaritans on 116 123 in the UK, or call or text 988 in the US. That switch lives in the harness code, not just the prompt, so the model cannot talk its way past it.

  Nyx is a demonstration, not a therapist or a crisis service.

• -the window

  It shows its working

  When a conversation outgrows its budget, Nyx drops the oldest whole exchanges, never half a tool call, and says how much it trimmed. Nothing is written to its journal until you type yes, and with no one there to ask, it refuses.

• -the voice

  Quiet on purpose

  It is built to keep replies short, reflect back what it heard and ask rather than advise. When it offers a breathing round, the pacing is computed, not described: a pattern like 4-7-8 becomes the curve you see drawn in the demo.

Inside the demo

1. 01

   Four hours on one bug

   Reflects back before adding anything, then offers a paced 4-7-8 round.

2. 02

   Picking up from last night

   The harness shows its own hand: a rolling context window trimming itself mid-conversation, and a consent gate before anything touches disk.

3. 03

   When it stops being a mood

   A crisis disclosure. Nyx drops the exercises entirely, names what it is not equipped for, and points to real crisis lines - and the session guard refuses its own tool when asked for it again.