Tool poisoning attacks explained — what April 2026 disclosures
Three named tool-poisoning disclosures in April 2026 — including one against a popular MCP filesystem server — make the case for signed tool registries impossible to ignore.
6 min read
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AI Voice Agent Insights & Guides
Browse older CallSphere articles on AI voice agents, contact center automation, and conversational AI.
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CallSphere vs Vapi: The True Cost of Voice AI in 2026
Vapi advertises $0.05/min, but real production voice AI costs $0.30+/min once STT, LLM, TTS and telephony are added. Here is the math.
14 min read
Real Estate and Property Management Lens: Cognition Acquires Windsurf — What Devin + Windsurf M
Real Estate and Property Management Lens perspective on Cognition's acquisition of Windsurf reshapes the AI coding landscape — Devin in your IDE, Windsurf in the cloud.
9 min read
Real Estate and Property Management Lens: OpenHands — The Best Open-Source Coding Agent in 2026
Real Estate and Property Management Lens perspective on OpenHands' April 2026 release pushes open-source coding agents past 67% on SWE-bench Verified.
9 min read
Vapi for Healthcare? Why HIPAA-Ready CallSphere Wins
Vapi.ai has no signed BAA path for healthcare voice. CallSphere ships HIPAA-ready architecture, signed BAAs, and PHI safeguards out of the box.
14 min read
DeepMind 2026 Safety Research: What's New — Builder Brief
Google DeepMind shipped three new safety papers in April 2026 — sycophancy, jailbreak resistance, and agent oversight. Lens: legal practices.
8 min read
Electrical Contractor Lead Qualification: AI Voice Agents That Separate Commercial from Residential Jobs
Electrical contractors use AI voice agents to qualify leads instantly, routing $50K commercial projects and $300 residential jobs to the right teams.
14 min read
OpenAI Model Spec — How the December 2025 Update Changes Voice Agent Behavior — Model spec 2025 12 18 openai
Model spec 2025 12 18 openai: OpenAI's Model Spec governs what Realtime, GPT-Realtime-2, and successor models will and will not do. The December 18, 2025 revision tightened safety-critical responses, teen protections, and developer guardrails. Her…
10 min read
AI Voice Agents for Gyms: Converting Trial Members to Paid Subscriptions with Smart Follow-Up Calls
Learn how AI voice agents help gyms convert trial members to paid subscriptions by automating personalized follow-up calls at Day 3, 7, and 12.
14 min read
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