Hands-on findings from Xcode 27.0, build 27A266a, recorded September 2026.
The client used was Codex. The MCP connection model also applies to other
clients that support local stdio servers; their configuration syntax differs.
Xcode 27 can expose its project, build, test, and device-interaction tools to an agent running outside the Xcode editor. It also ships agent skills as
On Apple Silicon Macs (ARM64), binaries signed without hardened runtime crash with
SIGBUS (EXC_BAD_ACCESS / EXC_ARM_DA_ALIGN) when CoreText attempts to render bitmap
emoji glyphs (sbix table). The crash occurs inside Apple's ImageIO framework:
IIOReadPlugin::callInitialize()
| //! # Proposed API Changes for str0m | |
| //! | |
| //! Type-state pattern enforcing correct API usage at compile time. | |
| //! | |
| //! ## Core Principles | |
| //! | |
| //! 1. **Time is driven externally** — caller provides `now: Instant` | |
| //! 2. **Every mutation requires poll-to-timeout** — type system enforces this | |
| //! 3. **All state changes are mutations** — media writes, DirectApi, SDP | |
| //! |
This document outlines a plan for implementing probe clusters in str0m, matching libWebRTC's bandwidth probing approach.
This plan covers probe clusters for existing media RTX/padding only. Pre-media SSRC 0 probing is out of scope and will be addressed in a separate PR that builds on this infrastructure.
| use tracing::{info_span, Span}; | |
| pub struct Blah { | |
| pub span: Span, | |
| } | |
| impl Blah { | |
| pub fn new(name: &str) -> Self { | |
| Blah { | |
| span: info_span!(name), |
| stokast v0.1.0 (/Users/martin/dev/stokast) | |
| ├── alg v0.1.0 (/Users/martin/dev/alg) | |
| │ ├── gcd v2.0.1 | |
| │ └── log v0.4.14 | |
| │ └── cfg-if v1.0.0 | |
| ├── arrayvec v0.7.1 | |
| ├── cortex-m v0.6.7 | |
| │ ├── aligned v0.3.5 | |
| │ │ └── as-slice v0.1.5 | |
| │ │ ├── generic-array v0.12.4 |
| use chrono::{DateTime, Utc}; | |
| use hmac::{Hmac, Mac, NewMac}; | |
| use once_cell::sync::Lazy; | |
| // notice this is percent_encoding=1.0.1 since I haven't bothered to | |
| // fix this for latter versions of the crate. | |
| use percent_encoding::{define_encode_set, utf8_percent_encode, SIMPLE_ENCODE_SET}; | |
| use sha2::{Digest, Sha256}; | |
| use std::env; | |
| use std::fmt::Write; |
Apple provides CTFontCopyDefaultCascadeListForLanguages to get a set of fallback font names
for a certain ISO language code. I want to know how much these vary.
main.swift is a quick hack to dump a JSON of all codes with the fallbacks. The test assumes Menlo 12.0 as the starting point.
output.json is the full output from running the swift hack.
Finally I used nodejs to crunch the json to buckets that have different lists of fallbacks. code is in crunch.js
buckets.json has the result of running the crunch.
| # propagate titles to the window | |
| set -g set-titles on | |
| # Minimalist window title "0:bash" | |
| set -g set-titles-string "#I:#W" | |
| # show colors | |
| set -g default-terminal "screen-256color" |