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fix(acp-snapshot): retain unchanged message ids

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Tianyi Cui
2026-07-30 15:41:16 +08:00
parent 69214b4708
commit eb51d4c669
11 changed files with 253 additions and 27 deletions
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.agents/notes/implemented/bug-fix/2026-07-27-stable-snapshot-refresh-volatiles.i18n.yaml
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@@ -2,5 +2,5 @@
# side as of the last confirmed-consistent state. Both languages carry equal authority;
# after editing either side, bring the other along and re-record with:
# pnpm run verify-translation-pairing --write .agents/notes/implemented/bug-fix/2026-07-27-stable-snapshot-refresh-volatiles.md
2026-07-27-stable-snapshot-refresh-volatiles.md: e2e951cd9f78b319a701a3e60afba48786633f03
2026-07-27-stable-snapshot-refresh-volatiles.zh.md: 55302b509e28520f90f6cd820e4962be014318cc
2026-07-27-stable-snapshot-refresh-volatiles.md: 5b513ea026008fc0c4ae9a8045408c534c050bec
2026-07-27-stable-snapshot-refresh-volatiles.zh.md: f3c21d14ae235179ca15ec30d964e02877aa86e9

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.agents/notes/implemented/bug-fix/2026-07-27-stable-snapshot-refresh-volatiles.md
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@@ -8,9 +8,13 @@ English | [中文](2026-07-27-stable-snapshot-refresh-volatiles.zh.md)
ACP snapshot comparison normalizes generated UUIDs, cwd aliases, spill locators, embedded event times, and omitted-byte counts, but refresh write-back persisted the fresh raw values. A behaviorally unchanged refresh therefore rewrote fixtures with new randomness or host-specific path spellings even though the comparison contract considered both logs equal.
Message identity needs a weaker structural precondition than aligned records: an unrelated log event can break record alignment while an inherited message's identity-free value remains unchanged across parent and child logs. Record mode also begins with freshly minted message UUIDs when it replaces an existing fixture.
## Decision
Refresh write-back uses `normalizeSessionLog` as its sole volatile-value authority. It normalizes the original harvested records with the fresh run's ids, cwd, and every cwd alias, while normalizing fixture records with the fixture header context; literal replacements affect only the raw values being written. After existing record alignment, it recursively compares fresh and existing leaves through those normalized records: normalized-equivalent leaves retain the existing raw value, while normalized-distinct leaves retain the fresh semantic value.
Before record or refresh writes fixtures, the suite fingerprints every complete surface message with its top-level `id` removed and groups occurrences across all parent/child logs. It reuses an existing UUID only when one fingerprint resolves to exactly one fresh ID and one existing ID, then applies that mapping to every fresh log. Repeated inherited occurrences with the same ID remain one candidate, while new, changed, duplicate-content, malformed, and conflicting messages keep their fresh IDs.
Refresh write-back uses `normalizeSessionLog` as its volatile-value authority for aligned leaves. It normalizes the original harvested records with the fresh run's ids, cwd, and every cwd alias, while normalizing fixture records with the fixture header context; literal replacements affect only the raw values being written. After existing record alignment, it recursively compares fresh and existing leaves through those normalized records: normalized-equivalent leaves retain the existing raw value, while normalized-distinct leaves retain the fresh semantic value.
Before reuse, the complete logical-record layout must align, apart from the existing packed-chunk and inserted-title equivalences. Normalized-equivalent changed strings form a log-wide bijection: one fresh string maps to exactly one existing string and vice versa, so repeated IDs remain correlated across records. An unexplained record mismatch or conflicting mapping disables normalized string reuse for that log.
@@ -26,6 +30,6 @@ Object fields align by key. Array elements align only when all corresponding arr
## Consequences
Repeated refreshes no longer rewrite aligned fixture values solely because the normalizer classifies them as volatile, and new volatile categories added to the normalizer automatically inherit the write-back behavior. Structural ambiguity remains conservative: unmatched records, conflicting string mappings, resized arrays, and strings containing both semantic and volatile changes use fresh values rather than risk reusing misaligned data.
Record and refresh no longer rewrite an unchanged unique message UUID solely because another event changed the surrounding record layout. Repeated refreshes also retain aligned fixture values that the normalizer classifies as volatile, and new volatile categories added to the normalizer automatically inherit that write-back behavior. Structural ambiguity remains conservative: unmatched records, conflicting string mappings, resized arrays, strings containing both semantic and volatile changes, and non-unique message fingerprints use fresh values rather than risk reusing misaligned data.
Focused unit coverage pins recursive object/array behavior, correlated IDs, ambiguous-layout fallback, conflicting mappings, fresh cwd aliases, volatile strings, and fresh semantic fields. Keyless refresh coverage proves approval UUIDs, cwd aliases, spill paths, and event-read volatility leave their committed fixtures byte-identical.
Focused unit coverage pins scenario-wide parent/child message correlation, unrelated event insertion, record write-back, new/changed/ambiguous messages, recursive object/array behavior, conflicting mappings, fresh cwd aliases, volatile strings, and fresh semantic fields. Keyless refresh coverage proves approval UUIDs, cwd aliases, spill paths, and event-read volatility leave their committed fixtures byte-identical.

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.agents/notes/implemented/bug-fix/2026-07-27-stable-snapshot-refresh-volatiles.zh.md
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ACP（Agent Client Protocol）快照比较会归一化生成的 UUID、cwd 别名、spill locator、嵌入的事件时间和省略字节数，但刷新写回会持久化本次生成的原始值。因此，即使比较契约将两份日志视为相等，一次行为未发生变化的刷新仍会用新的随机值或宿主特有的路径写法改写 fixture（测试前置数据）。
消息身份所需的结构前提比记录对齐更弱：无关的日志事件可能破坏记录对齐，但继承而来的消息去除身份后的值在父级和子级日志之间仍保持不变。录制模式在替换现有 fixture 时也会从新生成的消息 UUID 开始。
## 决策
刷新写回以 `normalizeSessionLog` 作为易变值的唯一判定依据。系统使用本次运行的 id、cwd 及全部 cwd 别名归一化原始收集记录，并使用 fixture header 上下文归一化 fixture 记录；字面量替换只影响要写入的原始值。现有记录完成对齐后，系统基于这些归一化记录，递归比较本次生成记录与现有记录的叶节点：归一化后等价的叶节点保留现有原始值，归一化后不同的叶节点则保留本次生成的语义值。
在录制或刷新写入 fixture 前，套件会移除每条完整 surface 消息的顶层 `id` 并计算指纹，同时将所有父级/子级日志中的出现项分组。仅当一个指纹恰好对应一个本次生成的 ID 和一个现有 ID 时，才会复用现有 UUID，随后将该映射应用到每份本次生成的日志。具有相同 ID、重复出现的继承消息仍算作一个候选项；新增、发生变化、内容重复、格式错误和存在冲突的消息则保留本次生成的 ID。
刷新写回以 `normalizeSessionLog` 作为已对齐叶值的易变值判定依据。系统使用本次运行的 id、cwd 及全部 cwd 别名归一化原始收集记录，并使用 fixture header 上下文归一化 fixture 记录；字面量替换只影响要写入的原始值。现有记录完成对齐后，系统基于这些归一化记录，递归比较本次生成记录与现有记录的叶节点：归一化后等价的叶节点保留现有原始值，归一化后不同的叶节点则保留本次生成的语义值。
复用前必须确保完整逻辑记录布局对齐，现有的打包分片与插入标题等价情形除外。归一化后等价但发生变化的字符串在整份日志范围内形成双射：一个本次生成的字符串只映射到一个现有字符串，反向亦然，因此跨记录重复出现的 ID 仍保持关联。出现无法解释的记录不匹配或映射冲突时，该日志会停用规范化字符串复用。
@@ -26,6 +30,6 @@ ACP（Agent Client Protocol）快照比较会归一化生成的 UUID、cwd 别
## 后果
重复刷新不再仅仅因为规范化器将已对齐的 fixture 值归类为易变值，就改写这些值；以后加入规范化器的新易变值类别也会自动继承该写回行为。结构有歧义时仍采取保守策略：记录无法匹配、字符串映射冲突、数组尺寸发生变化，或字符串同时包含语义变化与易变变化时，均使用本次生成的值，避免冒险复用未对齐的数据。
录制和刷新不再仅仅因为另一个事件改变了周边记录布局，就改写未变化且唯一的消息 UUID。重复刷新也会保留规范化器归类为易变值的已对齐 fixture 值；以后加入规范化器的新易变值类别也会自动继承该写回行为。结构有歧义时仍采取保守策略：记录无法匹配、字符串映射冲突、数组尺寸发生变化、字符串同时包含语义变化与易变变化，或消息指纹不唯一时，均使用本次生成的值，避免冒险复用未对齐的数据。
聚焦的单元测试固定了递归处理对象与数组的行为、关联 ID、有歧义布局时的回退、映射冲突、本次运行的 cwd 别名、易变字符串以及本次生成的语义字段。无密钥刷新测试证明，审批 UUID、cwd 别名、spill 路径和事件读取中的易变值不会改变已提交 fixture 的任何字节。
聚焦的单元测试固定了场景范围内的父级/子级消息关联、无关事件插入、录制写回、新增/发生变化/有歧义的消息、递归处理对象与数组的行为、映射冲突、本次运行的 cwd 别名、易变字符串以及本次生成的语义字段。无密钥刷新测试证明，审批 UUID、cwd 别名、spill 路径和事件读取中的易变值不会改变已提交 fixture 的任何字节。