# The Right Balance of Specification in Agent Development

The importance and cost balance of specification for AI agents.

- **Source:** [O'Reilly Radar](https://www.oreilly.com/radar)
- **Published:** 2026-07-17
- **Topic:** [Data & AI](https://brifing.si/c/data-ai)
- **Original article:** <https://www.oreilly.com/radar/the-right-amount-of-spec-for-agentic-development/>
- **On Brifing:** https://brifing.si/s/f63f0fab-e779-4e3a-95b0-acfd03aed343

## The Importance of Specification

In developing AI agents, having the right amount of specification is crucial. Too little leads to endless correction loops, while too much incurs high initial costs.

## The Cost of Specification

A simple prompt may seem attractive to start implementation immediately, but correction loops increase costs. The right amount of specification balances these costs.

## The Ideal Balance of Specification

For most agent work, the ideal specification should have enough structure to constrain the work, enough examples to make intent concrete, and enough executable checks to prevent guesswork.

## The Lack of Specification

Completely lacking specification leads to costly vibe-coding. This does not resolve ambiguity but complicates the process further.

## Specification in Software Engineering

Software engineering is less about coding and more about deciding what should exist, what should never happen, and which trade-offs matter.

## Agents and Specification

Agents reduce implementation costs while increasing the importance of specification. Vague requirements encounter machine speed instead of human slowness.

## Reviewing Specification

Writing the specification is not enough. Reviewing it and ensuring internal consistency prevents errors in the implementation process.

## Validating Specification

Validating the specification is a critical step before implementation. It reveals gaps and inconsistencies in the specification.

## Multi-Agent Systems

In multi-agent systems, when one agent's output becomes another's input, interpretive drift accumulates. This requires stronger specification.

## Specification and Contracts

In multi-agent systems, specification becomes more than guidance—it becomes a contract. This contract must include schemas, invariants, and validation rules.

## BDD and Executable Tests

BDD and executable acceptance tests go beyond methodology; they enhance the verifiability of the specification and prevent errors.

## Conclusion

Agents do not eliminate the need for specification. Instead, they make it cheaper to reach a level of specificity that is actually useful.

## Sources covering this story

- https://www.oreilly.com/radar/the-right-amount-of-spec-for-agentic-development/ — 

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._