# feed7 Weekly #003

Six practical upgrades for more measurable, maintainable, and cost-aware coding-agent sessions.

Published: 2026-07-27T00:00:00.000Z  
Selection: Six source-backed signals and one distraction to leave out.

## 1. How Evals and Prompts Shape Agent Behavior — Preetika Bhateja & Daniel Bump, YouTube Ads

Build evals early, inspect traces, and change one prompt, tool, rubric, or model component at a time. Compare human and LLM ratings, maintain a high-agreement golden set, and use ablations to establish whether a change actually improves the agent.

Source: https://www.youtube.com/watch?v=xyL2Ltkh-SA
Feed7: https://feed7.dev/p/how-evals-and-prompts-shape-agent-behavior-preetika-bhat-3518047f01
Trust: Source Linked

## 2. Harness Engineering is not Enough: Why Software Factories Fail — Dex Horthy, HumanLayer

Keep humans responsible for the resulting code. Use model-assisted planning, agree on design before implementation, and build in vertical slices so every generated change remains practical to read and test.

Source: https://www.youtube.com/watch?v=Ib5GBkD555M
Feed7: https://feed7.dev/p/harness-engineering-is-not-enough-why-software-factories-db6b4984d3
Trust: Source Linked

## 3. Introducing Cursor Router

Teams should test routing against cost per shipped change, not token price alone. Cursor’s classifier considers query, context, complexity, domain, model behavior, and cache misses; admins can set defaults and restrict models or modes.

Source: https://cursor.com/blog/router
Feed7: https://feed7.dev/p/introducing-cursor-router-bb03b50141
Trust: Official Source

## 4. Agent swarms and the new model economics

For large agent runs, reserve frontier models for decomposition and decisions, then give bounded implementation work to cheaper workers. Separate their contexts, record shared design decisions, delegate conflict resolution, limit oversized files, and stack independent review lenses.

Source: https://cursor.com/blog/agent-swarm-model-economics
Feed7: https://feed7.dev/p/agent-swarms-and-the-new-model-economics-32d427eb72
Trust: Official Source

## 5. citrolabs/ego-lite

For authenticated browser work, consider whether shared local state and parallel spaces can replace separate automation browsers. The project reports workflows finishing up to 2.5× faster than Vercel’s agent-browser on four complex tasks.

Source: https://github.com/citrolabs/ego-lite
Feed7: https://feed7.dev/p/citrolabs-ego-lite-629c51aa89
Trust: Needs Review

## 6. Vercel MCP can now deploy code

Builders using Claude, Cursor, or another MCP client can make deployment an explicit final agent step, but should preserve review and permission boundaries before shipping generated changes.

Source: https://vercel.com/changelog/vercel-mcp-can-now-deploy-code
Feed7: https://feed7.dev/p/vercel-mcp-can-now-deploy-code-f834153d50
Trust: Official Source

## 7. Building AI infrastructure with the Effingham County community

Builders should read this as infrastructure and ecosystem expansion, not as a new Codex capability or workflow change.

Source: https://openai.com/index/building-ai-infrastructure-with-the-effingham-county-community
Feed7: https://feed7.dev/p/building-ai-infrastructure-with-the-effingham-county-com-bd6ce42035
Trust: Official Source

## Agent Instruction

Use these items as source-backed context. Do not invent claims beyond linked material. Prefer practical implications for solo developer work. If sources conflict, call it out.