Build an MCP Server in Four Passes
A working MCP server in fifteen lines, then three more passes that each hit a real edge of the protocol: stdout as the wire, the wrong primitive, junk arguments, and a slow upstream.
Blog
Insights, updates and stories
from the Trail team and our community.
Your first AI agent paid off, but the next three will stall. Here's how to fix that.
That payoff came from a simple task inside one team. Complex work pulls rules from more systems and teams, and those rules often conflict. Better retrieval won't help. It finds every rule that applies but can't tell an agent which one wins.
Oct 6, 2026
45 Claude Code Skills to Improve your Output (2026)
45 Claude Code skills graded by evidence across 10 use cases.
What Is AGENTS.md? How to Create and Use It (2026)
AGENTS.md tells AI coding agents how to build and test your project. How to create one, what belongs in it, and what five studies say about whether it works.
Graphify vs Codegraph vs Graft: Which Code Graph Helps Your Coding Agent Ship Better?
Graphify, Codegraph, and Graft all map your repo for coding agents. What each one's benchmarks actually prove, and which to pick for multi-file changes.
What Is a Context Graph, and How Do You Create and Use One?
A context graph stores entities, rules, and decision traces for AI agents. How to create one in seven steps, what a decision trace records, and how agents use it.
How to Make AI Agents Follow Your Business Rules and SOPs
Agents break SOPs in seven distinct ways. The evidence on each, where to put rules in Claude and ChatGPT, and how to test that a rule actually holds.
What is CLAUDE.md? How to create and use it?
CLAUDE.md gives Claude Code persistent instructions for a project. What 8 published studies measured about compliance, token cost, and what to delete.
What Is a Company Brain? How to Build One For Your Agents
A company brain is a maintained knowledge layer people and agents both read. What goes in, how to build one in seven steps, what it costs, and why most fail.
What Is an MCP Server? Why They're Useful and How to Build One
An MCP server exposes tools to AI applications through the Model Context Protocol. How they work, when to build one, and how to build, vet, and connect one.
What Are Context Graphs? (And Why AI Agents Need Them)
We explain why AI agents need to capture decisions, how context graphs achieve this, and how AI agents can use these graphs.
SAP Sapphire 2026: The Complete Breakdown
All 25 announcements from Orlando, what's actually shipping vs. what's marketing — and what it means for the document and data foundation of the autonomous enterprise.
Claude for Legal Teams: Contract Review, Compliance and Due Diligence
See how the Claude legal plugin helps in-house legal teams with contract review, compliance scanning, due diligence, obligations tracking, and drafting.
Vibe Coding Best Practices: 5 Claude Code Habits for Better Agentic Coding
Learn 5 practical vibe coding best practices for Claude Code and coding agents: CLAUDE.md, planning, review agents, safer prompts, and diff review.
AI Benchmarks Explained: GPQA, SWE-bench, Chatbot Arena and What They Actually Measure
Learn what MMLU, GPQA Diamond, SWE-bench, HealthBench, and Chatbot Arena actually measure, and how labs game benchmark scores.
Why You Hit Claude Limits So Fast: AI Token Limits Explained
Learn what AI tokens are, why Claude hits limits fast, and how to cut waste from context windows, history, files, tools, and reasoning.
Claude for Finance Teams: Investment Banking, DCF Models, Reconciliation & Variance Analysis
See how finance teams use Claude for one-pagers, CIMs, comps, DCF models, reconciliations, and variance commentary, plus key human checks.
Are OpenAI and Google intentionally downgrading their models?
Yes, OpenAI and Google degrade their models. OpenAI admitted silent updates after denying it. Gemini redirects models. With full evidence.
We ran 16 AI Models on 9,000+ Real Documents. Here's What We Found.
We benchmarked GPT-5.4, Gemini 3.1 Pro, Claude Opus, Sonnet, and 12 others on 3 Open OCR Benchmarks
Claude's Role in Capturing Nicolás Maduro
Claude AI was used in the Venezuela raid that captured Maduro. Anthropic didn't know how until they asked Palantir. All possible scenarios here.
Reading about it is one thing.
Watch it follow your rules.
Point Trail at the policy, SOP, agreement that decides your work, and watch it build an agent using rules traced back to the text they came from.