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Describe Delta Signal: layers, stings, defaults, limits and prices.","inputSchema":{"properties":{},"type":"object"},"name":"describe_engine"},{"description":"Free. Render the SSTV signature card image for a message (PNG) so you can see what the picture sting will carry.","inputSchema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"text":{"description":"Up to 38 characters","maxLength":38,"type":"string"}},"required":["text"],"type":"object"},"name":"preview_card"},{"description":"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. 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