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Agent harness automatically adds date, overriding prompt control

By PulseAugur Editorial · [1 sources] ·

A developer attempted to test how large language models handle date-sensitive information by creating two agent prompts: one without a date and one with the current date. Unexpectedly, both agents provided identical responses, including the current date and a disclaimer about their knowledge cutoff, even though only one prompt was explicitly given the date. This occurred because the agent harness automatically appended the current date to every prompt, overriding the developer's attempt to control this variable. AI

IMPACT Developer tools may automatically inject context, limiting user control over agent behavior and potentially affecting date-sensitive reasoning.

RANK_REASON The item describes a technical issue encountered while using an agent harness, which is a tool for developers.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Agent harness automatically adds date, overriding prompt control

How we ranked this

Signal score
36 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The item describes a technical issue encountered while using an agent harness, which is a tool for developers.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, other
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High
Clearly on-topic for AI-industry coverage.
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Breaking (< 6h)
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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Enjoy Kumawat ·

    "I Could Not Build the Condition Where My Agent Didn't Know Today's Date"

    <p>A trending post this week described an agent that had the correct timestamp sitting right in its prompt and still reasoned as if an old conversation was still live — the date was there, the model just didn't use it. I wanted to run a version of that test myself: take an agent …

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