Delta Signal
Audio steganography & watermarking. Encode/decode hidden messages that survive YouTube re-encoding.
Should I use this
Quality & Safety
Findings (1)
- LOWTool 'describe_engine' description lacks action verbin describe_engine
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"delta-signal": {
"url": "https://signal.daxfoundation.org/mcp"
}
}
}Remote endpoints
https://signal.daxfoundation.org/mcpstreamable-httpWhat it can do
Tool inventory
Tools (5)
🟢describe_engine
Free. Describe Delta Signal: layers, stings, defaults, limits and prices.
Input Schema
{
"type": "object",
"properties": {}
}🟢preview_card(text)
Free. Render the SSTV signature card image for a message (PNG) so you can see what the picture sting will carry.
Input Schema
{
"type": "object",
"properties": {
"text": {
"type": "string",
"maxLength": 38,
"description": "Up to 38 characters"
}
},
"required": [
"text"
],
"$schema": "https://json-schema.org/draft/2020-12/schema"
}🟢render_signature(message, duration, seed, layers, stings)
Render a Delta Signal audio signature (WAV, 48 kHz) that hides your message: in the heartbeat rhythm, as text in the spectrogram, as an inaudible watermark, and optionally as an SSTV picture, a ggwave data chirp or modem tones. Returns a download link (kept 7 days) and a manifest. Survives YouTube-grade AAC/Opus.
Input Schema
{
"type": "object",
"properties": {
"message": {
"type": "string",
"maxLength": 32,
"description": "Printable ASCII, up to 32 characters"
},
"duration": {
"description": "Seconds of signature body (default 60)",
"type": "number",
"minimum": 3,
"maximum": 600
},
"seed": {
"description": "Watermark key; keep it to verify later",
"type": "string",
"maxLength": 64
},
"layers": {
"description": "Per-layer options: bed, heartbeat, primes, glyph {band: mid|hi}, watermark {payload}",
"type": "object",
"propertyNames": {
"type": "string"
},
"additionalProperties": {}
},
"stings": {
"maxItems": 8,
"type": "array",
"items": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"sstv",
"ggwave",
"modem"
]
},
"at": {
"anyOf": [
{
"type": "string",
"enum": [
"start",
"end"
]
},
{
"type": "number",
"minimum": 0
}
]
},
"text": {
"type": "string",
"maxLength": 140
},
"mode": {
"description": "sstv: robot36|robot72|martin1; modem: 1200|300|rtty",
"type": "string"
},
"protocol": {
"description": "ggwave: audible-normal|audible-fast|audible-fastest|ultrasound-*|dt-*",
"type": "string"
}
},
"required": [
"type"
],
"additionalProperties": {}
}
}
},
"required": [
"message"
],
"$schema": "https://json-schema.org/draft/2020-12/schema"
}🟢decode_audio(url, seed, layers)
Decode every Delta Signal layer from a WAV, MP3 or M4A (AAC) file at an https URL: heartbeat cipher, spectral glyph, prime count, watermark (needs the seed used to render), ggwave, modem text and SSTV pictures (returned as PNG).
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"format": "uri",
"description": "https URL of a WAV, MP3 or M4A (AAC) file (convert other formats first)"
},
"seed": {
"type": "string",
"maxLength": 64
},
"layers": {
"type": "array",
"items": {
"type": "string",
"enum": [
"heartbeat",
"primes",
"glyph",
"watermark",
"ggwave",
"sstv",
"modem"
]
}
}
},
"required": [
"url"
],
"$schema": "https://json-schema.org/draft/2020-12/schema"
}🟢verify_signature(url, seed, expected_message)
Verify a Delta Signal audio signature at an https WAV URL: returns which hidden layers are present (found_layers) and whether the audio matches an expected message (matches: true/false, or null if no expected_message given). Cheaper than full decode — use it when you only need to confirm presence or identity.
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"format": "uri",
"description": "https URL of a WAV file"
},
"seed": {
"description": "Watermark key used when the signature was rendered",
"type": "string",
"maxLength": 64
},
"expected_message": {
"description": "Message you expect to find; omit to discover what is present",
"type": "string",
"maxLength": 32
}
},
"required": [
"url"
],
"$schema": "https://json-schema.org/draft/2020-12/schema"
}Community
Evidence