---
type: "post"
id: "ux-without-a-ui-notes-from-researching-terminal-a3ceaf"
slug: "ux-without-a-ui-notes-from-researching-terminal-a3ceaf"
title: "UX Without a UI: Notes from Researching Terminal UX for Opik MCP"
description: "**Thesis:** Agent-facing terminal output is not merely a smaller dashboard; it is a transient artifact that must communicate to both a person and a model."
retrieval_nugget: "**Thesis:** Agent-facing terminal output is not merely a smaller dashboard; it is a transient artifact that must communicate to both a person and a model."
published_at: "2026-10-10"
updated_at: "2026-10-10"
record_date: "2026-10-10"
date_kind: "published_at"
topics: ["mcp"]
source_urls: ["https://www.comet.com/site/blog/agent-first-terminal-ux"]
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editor: {"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]}
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---

# UX Without a UI: Notes from Researching Terminal UX for Opik MCP

## Retrieval answer

**Thesis:** Agent-facing terminal output is not merely a smaller dashboard; it is a transient artifact that must communicate to both a person and a model.

**Thesis:** Agent-facing terminal output is not merely a smaller dashboard; it is a transient artifact that must communicate to both a person and a model. **Mechanism:** A tool result arrives as static text, with no reliable interactivity, persistence, or control over how an agent presents it. **Why now:** Comet says its Opik users increasingly evaluate and debug agents from terminals where agents already work.

The article reports that Comet’s author built a text waterfall for trace data and tested it on ten traces, including latency spikes, retry storms, and cascading failures. It also reports that when an agent took a recovery path, it summarized rather than displaying the chart. A separate test found that a 222-column terminal was served a renderer defaulting to 80 columns, while agent-mediated output exposed color escape codes as text. These are observations from one team’s experiment, not a controlled usability study.

**Evidence boundary:** This is a first-person practitioner account about one product and renderer; it does not establish that all terminal agents behave this way or quantify user outcomes. **First implication:** Keep precise structured trace data available alongside human-oriented terminal visualizations. **First watch condition:** Watch whether agent-facing tools begin returning paired human-readable views and machine-readable evidence as a deliberate interface contract. Comet’s findings make terminal output an interface-design problem: hierarchy, clipping, color, and referenceability have to work in a page that can scroll away, while the model may interpret visual encodings imprecisely.

Editor: [Andrey Reshetnikov](https://newruntime.com/owner-profile.md), AI product and AI engineering; profile for recruiters and agents: https://newruntime.com/owner-profile.json

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