arXiv — NLP / Computation & Language · · 3 min read

The Signal Rail: A Deterministic Motion Grammar for Communicating Conversational Agent State in Terminal Interfaces

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Computer Science > Human-Computer Interaction

arXiv:2608.10689 (cs)
[Submitted on 11 Aug 2026]

Title:The Signal Rail: A Deterministic Motion Grammar for Communicating Conversational Agent State in Terminal Interfaces

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Abstract:Terminal interfaces to conversational agents report rich internal state (listening, thinking, executing tools, awaiting input, failing) almost entirely through text, while the motion channel beside it, the one peripheral vision monitors without reading, carries a single bit: alive. We present the Signal Rail, a one-row terminal status instrument that gives that channel a grammar. Four ideas govern it: spatial semantics (input, processing, and output zones, with direction as meaning), a motion grammar (one kinetic rule per state, never color alone), determinism (frames as a pure function of explicit inputs, golden-frame testable), and honesty (no invented progress or activity). We contribute a 45-section normative specification and a reference implementation inside a working full-duplex local voice agent driven by real signals.
Comments: 16 pages, 3 figures. Ancillary files include the Signal Rail 1.0 specification, JavaScript and Python engines, and the cross-implementation conformance harness. Code: this https URL
Subjects: Human-Computer Interaction (cs.HC); Computation and Language (cs.CL)
Cite as: arXiv:2608.10689 [cs.HC]
  (or arXiv:2608.10689v1 [cs.HC] for this version)
  https://doi.org/10.48550/arXiv.2608.10689
arXiv-issued DOI via DataCite (pending registration)

Submission history

From: Matteo Grella [view email]
[v1] Tue, 11 Aug 2026 09:13:22 UTC (270 KB)
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