Prime Radiant

slackline and episodic-memory cut releases

Week of May 18, 2026 · May 18, 2026–May 24, 2026 · published May 24, 2026

The last of the backfill’s pre-launch weeks — the week immediately before this blog’s live coverage picks up. Two releases lead: episodic-memory cut a v1.4.2 of cross-platform install fixes, and slackline shipped default-recipient and lint-cleanup releases. Behind them, a broad week: a serf TUI visual redesign, a full Codex OAuth provider in sprout, a third macOS VM backend in stockyard, and recall-subsystem hardening in lace. Two outside contributors landed fixes on episodic-memory.

The week in numbers

  • 15 repos active (2 featured, 13 also shipped)
  • 1,588 commits
  • 8 merged PRs
  • +262,998 / −60,414 lines
  • 6 commit identities
  • 3 tagged releases

obra/episodic-memory

A memory and recall layer for coding-agent sessions.

8 commits 1 PR 🏷 v1.4.2 +1,776 −198

v1.4.2 was a cross-platform install pass: a postinstall script fixed for non-macOS/Linux, a single-instance lock for sync --background, and per-required-package manifest probing before launching the MCP server — plus a retryable-error sentinel written on summarizer failure, closing a silent-failure gap. Jesse Vincent drove the release; two outside contributors landed fixes the same week — Andy Wright (GitHub login minyek, the same account credited the prior week) fixed a summarizer-cwd / resume-fallback bug, and K. Z. (monsterxz9) fixed the Codex summarizer ignoring a deprecated model from history.

prime-radiant-inc/slackline

A Slack-identity CLI for AI agents.

6 commits 🏷 2 releases +389 −246

Releases v0.2.1 and v0.2.2: a default-recipient fix so thread replies to bot-authored messages now emit by default, plus a lint-cleanup pass that named several previously-magic wire-format error codes and Slack scopes as exported constants. Sole contributor: Jesse Vincent.

Also shipped

prime-radiant-inc/serf

A non-interactive coding agent.

575 commits +84,868 −18,049

A TUI visual-redesign wave: theme tokens replacing the legacy colorTheme / tuiStyles, terminal-native fg/bg painting via OSC 10/11 to match the active theme, a WCAG-contrast rebalancing, and a large “roborev” fix-response sweep working through numbered review rounds in sequence. Sole contributor: Jesse Vincent.

prime-radiant-inc/sprout

An experimental self-improving multi-agent coding system.

104 commits +17,062 −1,709

An OpenAI/Codex OAuth provider, end-to-end: credential-lifecycle management, refresh-race hardening, and macOS-keychain-direct secret writes (kept out of argv), with a Codex adapter handling streamed tool calls. Active-subagent status was surfaced in both terminal and web UIs and scoped correctly per session, fixing several status-leak-across-sessions bugs. Sole contributor: Jesse Vincent.

prime-radiant-inc/stockyard

A coding-agent VM orchestrator.

46 commits 1 PR +6,187 −554

Added Apple’s container tool as a third macOS VM backend alongside Firecracker and the outgoing vfkit path: a full AppleContainerBackend (start / stop / delete / list, a log-follower, a PTY-backed exec session), plus fixes for real-world container-CLI JSON quirks and multi-arch image builds caught by an actual arm64 build. Sole contributor: Matt Windbrook.

obra/lace

A lightweight agentic coding environment.

542 commits 2 PRs +107,281 −26,632

Security and reliability hardening on the recall subsystem: file modes (0o600/0o700) applied to the SQLite index and transcript files, a SQLite busy_timeout so contending writers wait instead of erroring, FTS5 query-error wrapping, persona-name validation (rejecting leading dashes, whitespace, and control characters), and a search order: recent option. Sole contributor: Jesse Vincent.

prime-radiant-inc/superpowers-evals

A behavioral eval lab (Quorum) for the superpowers project.

74 commits 1 PR +19,659 −5,476

README and harness documentation expansion, Codex-auth-per-run seeding (no more checked-in fixture), and a wave of scenario ports into the setup-helpers / preflight.sh shape. Sole contributor: Matt Windbrook.

obra/superpowers

An agentic skills framework and software-development methodology.

10 commits 2 PRs +112 −77

Two PRs merged (credited by PR author, the in-window commit rollup empty as in prior weeks): one fixes a false-trigger in the “ultrathink” keyword scanner for the systematic-debugging skill, the other responds to a bug report from mhat about Claude conflating “debugging” as noun vs. verb. Outside contributor ngalatis authored the keyword-scanner fix; Jesse Vincent authored and merged the other.

Smaller changes closed out the pre-launch stretch: gauntlet gained a static single-file HTML build target (gauntlet render <run-id>, Matt Windbrook and Jesse Vincent); llm-proxy fixed gzipped responses being logged uncompressed; claude-session-driver landed a unified-CLI redesign (v3.0.0); superpowers-chrome migrated every module onto a shared pageSession model; and ghost-pepper cut a v2.4.0 from outside contributor Matt Hartman (matthartman). The following week — May 25 — is where this blog’s live coverage begins.