Building Agentic AI Tool Libraries: A Developer's Guide to Custom Functions
Step-by-step guide to building reusable tool libraries for agentic AI with design patterns, validation, testing, and permission systems.
9 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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Agentic AI Prompt Management: Version Control and A/B Testing in Production
Master prompt version control, A/B testing, rollback, and analytics for agentic AI systems running at scale in production environments.
9 min read
Voice Agent Greeting Design: The First 5 Seconds (2026)
The first five seconds of an AI call decide whether the caller stays on the line. Cathy Pearl's earcons, Google CDS cooperative principle, and the exact greeting template CallSphere ships across 6 verticals.
10 min read
SLO and SLI Definitions for AI Voice Agents: Latency, Accuracy, Uptime
Picking the right SLIs for a voice agent is harder than picking SLIs for a REST API. Here's how CallSphere defines first-token latency, intent accuracy, and call-success rate across six verticals.
11 min read
Migrate from Bland AI to OpenAI Realtime + Your Own Stack in 2026
Bland charges $0.09/min bundled. Move to OpenAI Realtime + your own Twilio trunk and cut per-minute cost in half — full migration code, parity tests, and ramp plan.
13 min read
AI Voice Agent + Salesforce Agentforce 2: Apex Tools and Headless 360
Salesforce TDX 2026 turned the entire platform into MCP tools and APIs. We unpack how AI voice agents now plug directly into Agentforce 2 via Apex Invocable actions and the Agent Builder API.
11 min read
POLQA and PESQ for AI Voice Quality Monitoring in 2026
POLQA (ITU-T P.863) replaced PESQ for wideband and super-wideband AI voice. Here is how we score MOS in production, why 4.0+ is table stakes, and how to wire perceptual quality into a Twilio call pipeline without a phone lab.
11 min read
Streaming Call Transcripts Into ClickHouse for Sub-Second AI Voice Analytics in 2026
ClickHouse 26.2 added time-based block flushing and ClickPipes covers Kafka, S3, and Postgres CDC natively. Here's how CallSphere streams 50k voice agent transcripts a day into a ClickHouse cluster with sub-second p95 query latency.
12 min read
Agentic AI for Manufacturing: Building Predictive Maintenance Agent Systems
Build predictive maintenance AI agents for manufacturing with sensor monitoring, anomaly detection, maintenance scheduling, and parts ordering.
10 min read
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