Crate hct_mcp_signals 

HCT-MCP Signals: Coordination Signals Extension for MCP

This crate provides Rust types and utilities for HCT coordination signals, enabling urgency, timing, and approval semantics in MCP-based multi-agent systems.

Quick Start

use hct_mcp_signals::{cue, SignalType, Tempo};

let signal = cue("orchestrator", vec!["analyst"])
    .with_urgency(8)
    .with_tempo(Tempo::Allegro)
    .build();

let json = signal.to_mcp_json().unwrap();

Signal Types

• Cue - Trigger agent activation
• Fermata - Hold for approval
• Attacca - Immediate transition
• Vamp - Repeat until condition
• Caesura - Full stop
• Tacet - Agent inactive
• Downbeat - Global sync point

Structs

Conditions

Conditions for conditional signals (FERMATA, VAMP).

HCTSignal

Complete HCT Signal.

McpTaskSend

MCP task/send message with HCT signal extension.

Performance

Performance parameters (Layer 3 in HCT).

SignalBuilder

Builder for creating HCT signals.

Enums

HoldType

Types of holds for FERMATA signals.

SignalType

The 7 HCT coordination signal types.

Tempo

Musical tempo indications mapped to urgency timing.

Functions

attacca

Create an ATTACCA signal for immediate transition.

caesura

Create a CAESURA signal for full stop.

cue

Create a CUE signal to trigger agent activation.

downbeat

Create a DOWNBEAT signal for global synchronization.

embed_signal

Embed an HCT signal into existing JSON params.

extract_signal

Extract an HCT signal from JSON params.

fermata

Create a FERMATA signal to hold for approval.

get_json_schema

Get the JSON Schema for HCTSignal as a serde_json::Value.

get_json_schema_string

Get the JSON Schema as a formatted string.

get_mcp_extension_schema

Get the MCP extension wrapper schema.

tacet

Create a TACET signal to mark agent as inactive.

vamp

Create a VAMP signal to repeat until condition met.