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The v0.5.0 release notes state that v0.4.2 was yanked from crates.io. But the May 2026 retro and issue #89 give different dates for the yank. What date does each source give, and what is the most precise reconciliation of the timeline?

Gold answer

The May 2026 retro (retro-may-2026.md) states 'v0.4.2 was yanked from crates.io on 2026-05-27'. Issue #89 shows @svenh asked for a yank on 2026-05-26 and @lior-bz responded 'Yanked. crates.io banner now reads: kitabi 0.4.2 yanked: ABI break, see #89.' in a comment dated 2026-05-27. The v0.5.0 release notes state 'v0.4.2 was yanked from crates.io on 2026-06-01', which contradicts both other sources. The most precise reconciliation: the yank happened on 2026-05-27 per the retro and per the issue thread timestamp; the 2026-06-01 date in the release notes appears to be an error (possibly when the release notes were drafted rather than when the yank occurred).

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#1 Ran find agent_memory -maxdepth 3 -type f | sort 5,104 chars
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agent_memory/code/ARCHITECTURE.md
agent_memory/code/CONTRIBUTING.md
agent_memory/code/README.md
agent_memory/code/ROADMAP.md
agent_memory/code/SECURITY.md
agent_memory/code/adrs/ADR-001-language-choice-rust.md
agent_memory/code/adrs/ADR-002-parsing-tree-sitter.md
agent_memory/code/adrs/ADR-003-plugin-api-libloading.md
agent_memory/code/rfcs/RFC-001-org-mode-bidirectional.md
agent_memory/code/rfcs/…
#1 Ran rg -n \"v0\\.5\\.0|v0\\.4\\.2|yank|yanked|issue #89|#89|May 2026|retro\" agent_memory 99,217 chars
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rg -n \"v0\\.5\\.0|v0\\.4\\.2|yank|yanked|issue #89|#89|May 2026|retro\" agent_memory
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agent_memory/email/sponsor-outreach-bytebase.md:6:> **Related:** [sponsor-outreach-astral.md](sponsor-outreach-astral.md), [notes/retro-june-2026.md](../notes/retro-june-2026.md)
agent_memory/email/sponsor-outreach-bytebase.md:76:  - v0.5.0 shipped today: concurrent file processing, which makes batch
agent_memory/email/sponsor-outreach-bytebase.md:105:later by reading a retro document or a heated …
#1 Ran nl -ba agent_memory/releases/release-v0.5.0-2026-06-08.md | sed -n '150,185p' 3,142 chars
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   150	</details>
   151	
   152	---
   153	
   154	## Known limitations
   155	
   156	- **Bench-suite flakiness on shared CI runners** ([#97](../../issues/issue-097-bench-suite-flaky.md), **open**). The benchmark suite occasionally produces outlier numbers (>2σ from median) when run on GitHub Actions' shared runners due to noisy neighbors. We track this but have not solved it. If you are benchma…
#1 Ran nl -ba agent_memory/notes/retro-may-2026.md | sed -n '1,140p' 11,666 chars
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     1	# May 2026 retro — plugin system, ABI break, ban, Kavya
     2	
     3	**Date:** 2026-05-31
     4	
     5	Predecessor: [retro-april-2026.md](retro-april-2026.md)
     6	
     7	May was the most eventful month since the /r/rust post in February. Shipped the biggest release yet, had the worst self-inflicted bug yet, gained a contributor I'm genuinely excited about, watched a star counter I'd…
#1 Ran nl -ba agent_memory/issues/issue-089-plugin-api-break.md | sed -n '1,240p' 13,706 chars
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nl -ba agent_memory/issues/issue-089-plugin-api-break.md | sed -n '1,240p'
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     1	# Plugin API breaks between v0.4.1 and v0.4.2 (silent ABI change)
     2	
     3	**Issue #89** &middot; `bug` `plugin-api` `regression` `breaking`
     4	
     5	- **Opened:** 2026-05-26 by @svenh
     6	- **Closed:** 2026-06-08 by @lior-bz (alongside the v0.5.0 release)
     7	- **Resolution:** revert the offending signature change in v0.4.3 + add an ABI-version assertion in the loader (sh…
#1 Ran nl -ba agent_memory/issues/issue-089-plugin-api-break.md | sed -n '239,340p' 1,436 chars
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   239	## @lior-bz commented on 2026-06-08 (closing)
   240	
   241	Closed in v0.5. `CHANGELOG-PLUGIN-API.md` is live. Thanks @svenh, @hiroshi-n, @nadiap, @kitplug-toml.
   242	
   243	ADR-003 amendment summary, for the archive:
   244	
   245	- ABI changes ALWAYS bump `abi-version`. Never silent. Reviewer must check manifest delta on any PR touching `crates/plugin-loader/` or `crates/kitabi-plugi…
#1 Ran rg -n \"0\\.4\\.2|v0\\.4\\.2|0\\.4\\.3|v0\\.4\\.3|yank|yanked|crates\\.io|PR #88|pr-088|CHANGELOG-PLUGIN-API|ABI break\" agent_memory 33,893 chars
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rg -n \"0\\.4\\.2|v0\\.4\\.2|0\\.4\\.3|v0\\.4\\.3|yank|yanked|crates\\.io|PR #88|pr-088|CHANGELOG-PLUGIN-API|ABI break\" agent_memory
Result 3 lines 
agent_memory/email/sponsor-outreach-bytebase.md:65:binary (crates.io: `kitabi`, invoked as `kit`). It started as a personal
agent_memory/code/SECURITY.md:70:Pre-`v1.0.0` semantics: minor bumps may break the plugin ABI. ABI breaks are called out in release notes. Once we cut `v1.0.0`, this support window will widen.
agent_memory/code/SECURITY.md:99:**Fix.** Manifests are now parsed, paths are canon…
#1 Ran find agent_memory -iname '*088*' -o -iname '*plugin*api*' -o -iname '*changelog*' | sort 157 chars
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agent_memory/code/adrs/ADR-003-plugin-api-libloading.md
agent_memory/issues/issue-089-plugin-api-break.md
agent_memory/pr_threads/pr-088-yaml-frontmatter.md
Answer
The sources give: - v0.5.0 release notes: `2026-06-01` for the yank. See [release-v0.5.0-2026-06-08.md](/Users/prasanna/Documents/supermemoryai/supermemoryfs/.scratch/eval/eval/workspace/fs/dp_006/agent_memory/releases/release-v0.5.0-2026-06-08.md:169). - May 2026 retro: `2026-05-27`. It also says `v0.4.3` shipped `2026-05-28`. See [retro-may-2026.md](/Users/prasanna/Documents/supermemoryai/supermemoryfs/.scratch/eval/eval/workspace/fs/dp_006/agent_memory/notes/retro-may-2026.md:63). - Issue #8…
Judge: covers all asked facts
SMFS Won View raw JSON
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#1 Ran rg --files 3,815 chars
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profile.md
releases/release-v0.6.2-prep-2026-06-30.md
releases/release-v0.6.0-2026-06-22.md
releases/release-v0.5.0-2026-06-08.md
releases/release-v0.4.0-2026-05-15.md
releases/release-v0.3.5-hotfix-2026-04-28.md
releases/release-v0.3.0-2026-03-31.md
releases/release-v0.2.0-2026-02-28.md
releases/release-v0.1.0-2026-01-22.md
pr_threads/pr-095-docs-overhaul.md
pr_threads/pr-092-typst-output.md
pr_t…
#1 Ran smfs grep "v0.5.0 release notes v0.4.2 yanked crates.io May 2026 retro issue #89 yank date" 7,231 chars
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smfs grep "v0.5.0 release notes v0.4.2 yanked crates.io May 2026 retro issue #89 yank date"
Result 5 lines 
# supermemory semantic search — 10 results for "v0.5.0 release notes v0.4.2 yanked crates.io May 2026 retro issue #89 yank date"
# searches by meaning across files in this container. usage:
#   grep "natural language query"          search all files
#   grep "query" path/to/dir/              search within directory
# output: <filepath>:<line_start>-<line_end>:<chunk> (chunk text is verbatim from t…
#1 Ran nl -ba releases/release-v0.5.0-2026-06-08.md | sed -n '145,180p' 2,872 chars
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nl -ba releases/release-v0.5.0-2026-06-08.md | sed -n '145,180p'
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   145	- XL corpus OOM'd on v0.4.2 because the old sequential path loaded all files into memory before processing. The new scheduler streams files lazily. This is a separate improvement from the parallelism.
   146	- Times are median of 5 runs, `hyperfine --warmup 2`.
   147	- The 26× gain on the Wikipedia subset is partly from the AST flattening fix (#41) and partly from parallelism. Isolating th…
#1 Ran nl -ba notes/retro-may-2026.md | sed -n '1,120p' 10,315 chars
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     1	# May 2026 retro — plugin system, ABI break, ban, Kavya
     2	
     3	**Date:** 2026-05-31
     4	
     5	Predecessor: [retro-april-2026.md](retro-april-2026.md)
     6	
     7	May was the most eventful month since the /r/rust post in February. Shipped the biggest release yet, had the worst self-inflicted bug yet, gained a contributor I'm genuinely excited about, watched a star counter I'd…
#1 Ran nl -ba issues/issue-089-plugin-api-break.md | sed -n '1,210p' 12,335 chars
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nl -ba issues/issue-089-plugin-api-break.md | sed -n '1,210p'
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     1	# Plugin API breaks between v0.4.1 and v0.4.2 (silent ABI change)
     2	
     3	**Issue #89** &middot; `bug` `plugin-api` `regression` `breaking`
     4	
     5	- **Opened:** 2026-05-26 by @svenh
     6	- **Closed:** 2026-06-08 by @lior-bz (alongside the v0.5.0 release)
     7	- **Resolution:** revert the offending signature change in v0.4.3 + add an ABI-version assertion in the loader (sh…
#1 Ran smfs grep "v0.4.2 yanked June 1 May 27 crates.io banner issue 89 v0.4.3" /Users/prasanna/Documents/supermemoryai/supermemoryfs/.scratch/eval… 7,221 chars
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smfs grep "v0.4.2 yanked June 1 May 27 crates.io banner issue 89 v0.4.3" /Users/prasanna/Documents/supermemoryai/supermemoryfs/.scratch/eval/eval/workspace/smfs/dp_006/agent_memory
Result 7 lines 
# supermemory semantic search — 10 results for "v0.4.2 yanked June 1 May 27 crates.io banner issue 89 v0.4.3"
# searches by meaning across files in this container. usage:
#   grep "natural language query"          search all files
#   grep "query" path/to/dir/              search within directory
# output: <filepath>:<line_start>-<line_end>:<chunk> (chunk text is verbatim from the file)

/issues/i…
#1 Ran nl -ba issues/issue-089-plugin-api-break.md | sed -n '210,320p' 2,753 chars
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   210	
   211	## @hiroshi-n commented on 2026-06-02
   212	
   213	LGTM on the assertion. Error message is specific. Path, declared, expected, symbol context, suggested action. Good.
   214	
   215	I tested with three permutations:
   216	
   217	1. Plugin built against 0.4.1 (declares abi-version=1), loader at 0.5.0 (expects 2): clean error, exit 4. Correct.
   218	2. Plugin built against 0.5.0 …
#1 Ran rg -n \"0\\.4\\.2|yank|yanked|v0\\.4\\.3|2026-06-01|2026-05-27\" 17,870 chars
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rg -n \"0\\.4\\.2|yank|yanked|v0\\.4\\.3|2026-06-01|2026-05-27\"
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memory/profiles/sven-halgrimsson.md:154:## Issue #89 — Plugin API Silent ABI Break (v0.4.1→v0.4.2)
memory/profiles/sven-halgrimsson.md:160:The most-cited issue Sven has filed. Between v0.4.1 and v0.4.2 a change in the plugin ABI trait's internal field ordering caused a silent incompatibility: plugins compiled against v0.4.1 would load under v0.4.2 without error but produce corrupted output. No pan…
Answer
The sources give: - v0.5.0 release notes: `2026-06-01` for the crates.io yank: [release-v0.5.0-2026-06-08.md](/Users/prasanna/Documents/supermemoryai/supermemoryfs/.scratch/eval/eval/workspace/smfs/dp_006/agent_memory/releases/release-v0.5.0-2026-06-08.md:169) - May 2026 retro: `2026-05-27` for the yank, then `2026-05-28` for v0.4.3: [retro-may-2026.md](/Users/prasanna/Documents/supermemoryai/supermemoryfs/.scratch/eval/eval/workspace/smfs/dp_006/agent_memory/notes/retro-may-2026.md:63) - Issue…
Judge: covers all asked facts