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How System Prompts Define Agent Behavior

blog.nilenso.com · published 10 February 2026

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1blogs citing

First cited: 11 Feb 2026
Most recent: 11 Feb 2026
Rank this month: not ranked
Links from this post: 21
Words captured: 1,501

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Drew Breunig

How System Prompts Define Agent Behavior Read at the source ↗

11 Feb 2026

Links from this post

Link

Host

https://x.com/dbreunig

x.com

How System Prompts Define Agent Behavior Read at the source ↗

dbreunig.com

https://nilenso.github.io/context-viewer/g/960d42ad-314c-44cf-8594-4b009ef528a1/comparison?sidebar=0&panel=0&sortBy=category&sortDir=asc&import=https://raw.githubusercontent.com/nilenso/long-prompts-analysis/refs/heads/main/context-viewer-exports/system-prompts-simpler.json

nilenso.github.io

https://github.com/asgeirtj/system_prompts_leaks

github.com

https://github.com/nilenso/long-prompts-analysis/tree/main/data/prompts/filtered

github.com

https://github.com/nilenso/context-viewer

github.com

https://www.adiasg.com/blog/comparing-cursors-prompts-across-models

adiasg.com

https://nilenso.github.io/context-viewer/g/b179a05f-2bd4-4012-83ab-42a0cb1e79fd/comparison?sidebar=0&panel=0&legend=compact&sortBy=category&sortDir=asc&cols=5&import=https://raw.githubusercontent.com/nilenso/long-prompts-analysis/refs/heads/main/context-viewer-exports/claude-prompt-evolution-export-simpler.json

nilenso.github.io

https://nilenso.github.io/context-viewer/g/56b68fb5-7221-4c04-807e-b590f138c1fe/comparison?sidebar=0&panel=0&view=tokens-absolute&legend=compact&sortBy=category&sortDir=asc&cols=10&spr=4&import=https://raw.githubusercontent.com/nilenso/long-prompts-analysis/refs/heads/main/context-viewer-exports/codex-prompt-evolution-export-only-codex.json

nilenso.github.io

https://cchistory.mariozechner.at

cchistory.mariozechner.at

Weird system prompt artefacts Read at the source ↗

blog.nilenso.com

https://www.dbreunig.com/2025/11/11/don-t-fight-the-weights.html

dbreunig.com

https://x.com/aidenybai/status/1993901129210712129

x.com

How System Prompts Reveal Model Biases Read at the source ↗

blog.nilenso.com

https://opencode.ai

opencode.ai

https://opencode.ai/docs/agents/

opencode.ai

https://nilenso.github.io/context-viewer/g/67175678-6244-45bc-b022-238b72f8e646/comparison?sidebar=0&panel=0&legend=compact&sortBy=category&sortDir=asc&cols=5&import=https://raw.githubusercontent.com/nilenso/long-prompts-analysis/refs/heads/main/context-viewer-exports/swapping-prompts-swe-tasks.json

nilenso.github.io

Codex CLI vs Claude Code on autonomy Read at the source ↗

blog.nilenso.com

https://platform.claude.com/docs/en/release-notes/system-prompts

platform.claude.com

https://github.com/openai/codex/blob/d452bb3ae5b5e0f715bba3a44d7d30a51b5f28ae/codex-rs/core/prompt.md

github.com

https://cchistory.mariozechner.at/?from=2.1.31&to=2.1.34

cchistory.mariozechner.at