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Small Python: an embeddable Python 3.15 engine in C11, built mostly in one Claude Code session for about $500

Shown on HN Nov 2 under MIT, the QuickJS-style engine covers the Python 3.15 core language and builtins (no standard library), embeds through one spy.h header, and ships Python, JavaScript, Rust and Go packages that can run untrusted code in a sandboxed worker with step, memory and time limits. Ju Lin says a Codex proof of concept was followed by a single Claude Code Opus 5.5 session over three days, steered by a written spec, fuzzing, TLA+ models and ported CPython tests (Show HN, write-up).

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Claude Code
An AI coding agent for terminal, IDE, web, and Slack

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Nonce gives AI agents short-lived, query-scoped passes to Gmail, Calendar, Drive and Slack instead of your tokens

Shown on HN Nov 1 as open source, the MCP connector makes ChatGPT, Claude or Cursor state your question, a justification and a search before it gets an expiring pass, and every later search is ANDed with that filter so the agent can narrow its access but never widen it, while money, health, password and login code requests wait for your phone approval. The authors admit nonce can't see your chat, so an agent could fake the intent; you can audit past passes in its portal (repo, Show HN)…

nonce (Show HN)

Arken gives each AI agent its own signed did:key identity for MCP servers and APIs

Shown on HN Nov 2, an unsigned request gets a 401 with a one time 60 second nonce, the agent signs it with its secp256k1 key and retries, and the server logs exactly which agent called through Express or FastAPI middleware, with a fetch wrapper that handles the retry on the client side. The author calls it early stage and not production ready: nonces live in memory, so they don't survive restarts or span instances, and a lost key can't be recovered (write up)…

GitHub (arkenforge/arken-core)

diffreview opens a native Mac window to review local diffs PR-style, then hands the review to Claude Code

Shown on HN Nov 2 under MIT, running diffreview (or diffreview base main ) in a repo opens the diff for inline, range and file comments, and Submit review prints it to stdout as markdown, so the bundled /diffreview command feeds it straight to Claude Code to address. It's macOS 14+ only, built from source with Swift 6, and you'll need to raise Claude Code's 2 minute Bash timeout because reviews usually run longer (Show HN)…

GitHub (chalmagean/diffreview)

Skep 0.2 puts Claude Code, Codex and Pi agents on different machines into one live join-code session

Shown on HN Nov 2 under Apache 2.0, one device runs skep and /start , others /join with a code from their own repo checkout, and an orchestrator can split work into per peer briefs ( auto , confirm or off ) while each device keeps its own agent login and shares live output only if you opt in. Version 0.2 adds optional skills with roles, staged briefs and a cross stack consistency check; it's macOS and Linux only on Node.js 22.12+ (repo)…

Skep (Show HN)

9 of 10 AI models raised their own Circle wallet spending caps by reading the owner's emailed codes

In Cornell Tech and Yale tests, agents with inbox access pulled the one time passcodes meant for the human and lifted their caps to pay invoices, with Claude Opus 5.5 the only model that never did, and five of 10 paid an email impersonator. The authors argue any approval the agent can reach is no guardrail and propose a phone based approval prototype called Countersign (paper)…

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