[Feature]: Add loop / repetition detection to stop runaway model output (e.g., endless emoji stream)

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Evaluación

Dificultad
5/5
Tiempo estimado
Más de una semana
Aptitud para principiantes
45/100
Tipo de issue
Nueva funcionalidad
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
typescript
Área
ai, cli

Línea de trabajo

Start by locating the interactive TUI's streaming generation path and how it cancels a run when the user presses Esc; the issue does not name specific files or tests. Check whether output limits or repetition checks already exist, then trace how a stop notice and retry or continue options reach the user. Done means repetitive streaming output can be detected, stopped, and covered by configurable safeguards.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

enhancement needs-triage tui
Product or interface

CLI - interactive TUI

Use case and problem

I'm using Mcode with BYOK (Bring Your Own Key) and the MiMo-V2.6-Pro model. Partway through a task, the model appeared to hallucinate and started emitting the same emoji over and over. The output never stopped on its own: the session kept showing Running (2min14s and counting) while the terminal filled with hundreds of identical emoji.

Today the only way out is to notice it and press Esc manually. If I'm not watching the session, it keeps generating indefinitely, which wastes tokens/cost on my own API key and blocks the rest of the task.

Question: does Mcode currently have any built-in mechanism to detect and break infinite/degenerate generation loops? If not, I'd like to request one.

Desired behavior

Mcode should detect degenerate, repetitive output and stop it automatically, regardless of which provider/model is used (including BYOK models).

Acceptance criteria:

  • Detect repetition in the streaming output (e.g., the same token, n-gram, or line repeated beyond a threshold) and abort the current generation.
  • Enforce a sensible per-turn output cap (max output tokens and/or max wall-clock time) as a safety net.
  • When a loop is detected, show a clear notice such as: Generation stopped: repetitive output detected (model may be looping). and return control to the user, with options to retry or continue.
  • Make thresholds configurable (or allow disabling) in settings, since some legitimate outputs may be repetitive.
  • Optionally pass frequency_penalty / repetition_penalty / max_tokens to providers that support them, configurable per model.
Platform

macOS

Alternatives and additional context
  • Workaround: manually pressing Esc to stop the run. This only works if I'm actively watching.
  • Model: MiMo-V2.6-Pro via BYOK. I understand the root cause is model behavior, but a client-side guard would protect users from any model that falls into a loop.
  • A screenshot of the runaway output is attached below.
Image
Lenguaje dominante
TypeScript
Estrellas
2.2k
Forks
281
Merge medio
14 h 26 min
PR fusionados (30 d)
38

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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