Gemini Lets the Model Schedule Parallel Tools. Codex Makes the Runtime Decide.

Terminal agents are learning the same trick — run more tools at once — but Gemini CLI and OpenAI Codex disagree on who should be in charge of that decision. One pushes dependency control up into the prompt and tool schema. The other keeps it down in runtime metadata and locks.

repo openai/codex main

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> source trail / March 19, 2026 / Daily Edition

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May 25, 2026

Agent Reliability Is Moving Into the Test Rig

The newest source-readable trail points away from model mystique and toward the workflows that test, trace, serialize, and maintain agent behavior.

1 story 5 source signals 2 repos

May 24, 2026

Agent Runtimes Are Learning Where to Say No

After shipping more visible control planes, agent projects are now tightening the places where tools, plugins, credentials, chat context, and test runs are allowed to flow.

1 story 6 source signals 3 repos

May 23, 2026

Agent Runtimes Are Learning to Ship Their Control Plane

A set of Codex, Hermes Agent, Gemini CLI, and Crush commits shows agent tools packaging the machinery around the model: shells, platform adapters, context profiles, and skill catalogs.

1 story 13 source signals 5 repos

May 22, 2026

Agent Runtimes Are Making Their Limits Explicit

Recent Crush and LangChain changes show agent infrastructure turning hidden boundaries - shell permission, context overflow, and model token limits - into runtime contracts that users and developers can see.

1 story 8 source signals 2 repos

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