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claude-opus-4-8: schema-invalid edit tool arguments (stray extra keys)

claude-opus-4-8 (also observed with claude-fable-5) intermittently emits tool inputs that violate the tool's input_schema: a stray extra key with an empty/placeholder value appended to an object, typically after a long oldText/newText string in a multi-edit call, despite additionalProperties: false at every nesting level. Examples observed in real pi coding-agent sessions (170 occurrences across 50 sessions in ~2 weeks):

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100% Local AI Voice Chat with Custom Voice

A fully local, privacy-first voice chat setup running on a single machine (tested on WSL2 with an NVIDIA RTX 4070 SUPER). You talk to an LLM through a web UI using your microphone, it responds with a cloned custom voice — all processing stays on your hardware. No cloud APIs required.

There is a fairly high latency on non-Mac setup, but it is usable if you are patient. You can privately voice chat with your favorite video game character now!

Note that this README is not 100% tested, the real setup has been evolving organically. It may be a bit chaotic too. You may try asking if you are stuck on something. I recommend you just work through it together with an AI assistant. E.g.:

1. Open terminal and start wsl (you will need WSL set up on Windows; on Linux, this should all also work, and even easier)
2. Copy this file to your home directory.
3. Set up nenv with node-22.

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Množiny. Teorie matic. Soustavy lineárních rovnic.
	Gaussova eliminace
	Diskriminant
	Invertibilni matice, singularni matice
	Linearni zobrazeni, eigenvalues

Základy matematické analýzy. Metody aproximace funkcí. Metoda nejmenších čtverců. Aplikace pro hledání modelů z naměřených reálných dat.
	Lagrangeho multiplikatory
	Newtonova metoda
	Linearni regrese

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