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Show HN: What the Harness? LLM agent inconsistencies in MCP implementation

https://what-the-harness.polytomic.com
1•gms•1h ago
Hi HN,

We (Polytomic) noticed that LLM agents (Claude, Codex, Grok, Amp, etc) are inconsistent in their MCP implementations.

We made tables inspired by the browser-compatibility tables of yore that list the differences.

Hope you find this as useful as we did!

Applied to my own company's job posting under a fake name. Rejected in 6 minutes

https://twitter.com/SumitM_X/status/2112429356257829028
2•punkbit•1m ago•0 comments

You can now enjoy TUI Radio with all the best features

https://github.com/mugendi/stumble-radio
1•nguru•2m ago•1 comments

Waste tsunami. Water and the hidden cost of AI data centres

https://michaelwest.com.au/waste-tsunami-water-and-the-hidden-cost-of-ai-data-centres/
2•speckx•6m ago•0 comments

Pac Learning Game (2025)

https://www.journalovi.org/2024-Cashman-PAC-learning-game/
2•measurablefunc•7m ago•0 comments

Show HN: qrsticks

https://qrsticks.greg.technology/
1•gregsadetsky•8m ago•0 comments

Digital Freedom Across the World

https://eylenburg.github.io/countries.htm
2•HotGarbage•9m ago•0 comments

Mouse against Opus 5.5 in an agent harness. 13x faster

https://twitter.com/heypeterjames/status/2112621952879771744
2•Aeroi•9m ago•1 comments

Anthropic S-1 Shows Red-Hot Growth, Risks and Computing Costs

https://www.wsj.com/tech/ai/anthropic-revenue-growth-ipo-accaf0f1
4•mmmmmbop•9m ago•0 comments

Upcoming Critical PHP Security Release

https://www.php.net/archive/2026.php
2•choult•10m ago•0 comments

Building a Robot Owl with No Robotics Experience

https://mattcool.tech/posts/hoot-a-small-robot-companion-for-learning/
2•mbcool•12m ago•0 comments

A Framework for Peace in Ukraine

https://www.commondreams.org/opinion/framework-for-peace-in-ukraine
3•simonebrunozzi•13m ago•0 comments

Ask HN: Is anyone using agents to test a better version of democracy?

2•amelius•15m ago•1 comments

GTA 6 Digital Pre-Orders Climb to 6.45M, PlayStation Holds 74% Share

https://www.techpowerup.com/353934/gta-6-digital-pre-orders-climb-to-6-45-million-playstation-hol...
1•speckx•15m ago•0 comments

Whatever Happened to Fire Escapes?

https://practical.engineering/blog/2026/10/20/whatever-happened-to-fire-escapes
1•crescit_eundo•16m ago•0 comments

Blanking Beavers: Results and Open Problems

https://nickdrozd.github.io/2026/10/20/blanking-beavers-results-and-open-problems.html
1•nickdrozd•17m ago•0 comments

Links Browser

https://links.twibright.com/features.php
1•smartmic•17m ago•0 comments

GitHub Actions Feedback Survey

https://survey3.medallia.com/?actions&id=821775
1•colinmarc•18m ago•0 comments

Does anyone else feel Spotify's UI is just frustrating?

https://www.reddit.com/r/UI_Design/comments/1n03mqt/does_anyone_else_feel_spotifys_ui_is_just/
1•amelius•19m ago•0 comments

Show HN: Modula-9, a Wirth-family language designed for auditing AI-written code

https://www.modula9.net
1•atverm•19m ago•0 comments

A practical guide to AI image generation, from diffusion to agents

https://danielball.com/notes/ai_image_generation.html
1•westsmith•21m ago•0 comments

Trump administration holds up Patriot missile transfers for Ukraine

https://www.washingtonpost.com/politics/2026/10/19/amid-deteriorating-relations-washington-holds-...
4•consumer451•22m ago•1 comments

Show HN: Apple Reminders MCP – native read/write via ReminderKit

https://github.com/xiaofeng-han/apple-reminders-mcp
1•hhhanxfus•25m ago•0 comments

Coding.Snapsta – 430 free, zero-dependency HTML/CSS templates without signup

https://coding.snapsta.net/lets_code/
1•SystemsX•25m ago•0 comments

Must do's for your startup culture

https://www.ubiquity.vc/blog/tim-brown-of-allbirds-3-must-do-s-for-your-startup-culture
1•ariloeg•26m ago•0 comments

I tell the IMF the Singularity has begun

https://importai.substack.com/p/import-ai-477-in-which-i-tell-the
1•gmays•28m ago•0 comments

List of Games Included with Windows

https://en.wikipedia.org/wiki/List_of_games_included_with_Windows
1•skibz•29m ago•0 comments

RDP to Your Mac

https://prordp.app
2•AndrewDucker•30m ago•0 comments

Microsoft Announces OneDrive CLI

https://www.neowin.net/news/microsoft-gives-onedrive-admins-a-new-command-line-tool/
1•bundie•31m ago•0 comments

Parano1d: Transparent Proof-Carrying State over Binary Tower Fields

https://zenodo.org/records/23485635
2•ignotusnemo•32m ago•1 comments

Lego Engineered the Perfect Plaything

https://thereader.mitpress.mit.edu/how-lego-engineered-the-perfect-plaything/
1•nadis•32m ago•0 comments