Let an episode survive a restart - #73
Conversation
A host that checkpoints the driver's state could resume the episode but not the conductor: the open conversations, the per-seat watermarks, the nudge counts, the concluded list and who is parked all lived only in memory, so a restart lost them and the room started over. `Conductor::snapshot` answers `Some` only between waves -- every row committed, nothing in flight, no commit outstanding -- because a snapshot mid-wave would either lose the rows the host has not appended yet or duplicate them on resume. `Conductor::resume` rebuilds from one, on a driver and a routing the host supplies again: a live router is not state, and a policy the operator changed between restarts should be the new one. The loop checkpoints once per settled wave through `Journal::checkpoint`, and `resume_episode` carries an episode on from a snapshot. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Tiny Sweeper reviewTiny Sweeper reviewed this change across 6 lane(s) and found 4 active actionable finding(s). Detailed lane evidence and any incomplete work are listed below. State: Ready for maintainer review Review snapshot
Completeness: Complete What changedThe review could not produce a supported behavioral summary; inspect the cited changed surface and lane details below. FeaturesNone identified with supported citations. TestsNo supported feature-to-test mapping was produced. Test execution is not inferred. Findings
Resolved this pass
Before mergeNone. How this fits togetherflowchart LR
n0["Child<br/>changed"]:::changed
n1["starters<br/>changed<br/>6 findings"]:::flagged
n2["every_event_and_refusal_survives_the_wire<br/>changed<br/>3 findings"]:::flagged
n3["Sequence"]:::impacted
n4["iter"]:::impacted
n5["..._between_waves_and_carries_the_episode_on"]:::impacted
n6["drive"]:::impacted
n7["ConductorState"]:::impacted
n8["run_episode"]:::impacted
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classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff
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📝 WalkthroughWalkthroughThe driver adds serializable conductor snapshots that are available between settled waves. The episode API checkpoints snapshots through the journal and adds ChangesEpisode checkpointing
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant drive
participant Conductor
participant Journal
participant resume_episode
drive->>Conductor: snapshot()
Conductor-->>drive: ConductorState snapshot
drive->>Journal: checkpoint(snapshot)
resume_episode->>Conductor: resume(snapshot, driver, routing, policy)
Conductor-->>resume_episode: restored conductor
resume_episode->>drive: continue episode loop
Merge Risk: 🟡 Moderate · up to Episodes can now be checkpointed and resumed after a restart. However, restoring a stale or mismatched checkpoint is only partly validated. Instead of being rejected up front, a bad checkpoint can crash or fail partway through the resumed episode. Validate all restored conversation state before merging, and update the episode documentation to list the new checkpoint hook. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 9 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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$0.0547 · 930,439 in / 28,698 out · 49,487 cached (5%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash · 1,143 embedded
critique: $0.0253 · 463,390 in / 13,518 out · 35,160 cached (8%) · gpt-5.6-luna, deepseek/deepseek-v4-flash
security: $0.0263 · 425,238 in / 9,750 out · 14,327 cached (3%) · gpt-5.6-luna
tests: $0.0020 · 22,425 in / 56 out · 0 cached (0%) · deepseek/deepseek-v4-flash
| policy: ConductPolicy, | ||
| snapshot: ConductorState, | ||
| ) -> Result<Self> { | ||
| let state = driver.resume(snapshot.state)?; |
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Validate every child before restoring the conductor
driver.resume validates only snapshot.state; each Child contains its own DriverState, participant identities, desk identity, and root, but those values are inserted directly into children without validation or consistency checks. A caller can deserialize a snapshot whose child names another desk or unknown seat (or whose map key disagrees with child.root), and resume will still succeed before later turns operate on that invalid conversation. Validate every child state against the supplied driver and reject inconsistent child roots before constructing the conductor.
Additional security observation
Validate every child state before restoring it
[RULE] validate-deserialized-state
driver.resume validates snapshot.state, but each Child contains its own DriverState and snapshot.children is copied directly into the conductor without validation. A deserialized or tampered snapshot can therefore introduce a child episode naming another desk or participant, bypassing the validation promised by resume and allowing invalid state to be used on subsequent waves. Validate every child state with driver.resume before constructing the conductor.
Suggested change for this observation (reference only)
let state = driver.resume(snapshot.state)?;
let children = snapshot
.children
.into_iter()
.map(|(root, mut child)| {
child.state = driver.resume(child.state)?;
Ok((root, child))
})
.collect::<Result<BTreeMap<_, _>>>()?;
Ok(Self {
driver,
routing,
[RULE] validate-restored-state ·
| use tinyhivemind_driver::{BroadcastRouting, CompletionDriver, ConductPolicy, Door}; | ||
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| use super::super::run_episode; | ||
| use super::super::{resume_episode, run_episode}; |
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Use an existing resume API before importing it
resume_episode is not defined anywhere under crates/tinyhivemind-openhuman/src, so this unresolved import prevents the crate's tests from compiling. Implement the function in the parent module or update the test to call the actual resume entry point.
[RULE] compile-failure ·
| desk_name: snapshot.desk_name, | ||
| policy, | ||
| state, | ||
| children: snapshot.children.into_iter().collect(), |
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Validate every child before restoring it
driver.resume validates only snapshot.state; each restored Child contains its own DriverState but is copied directly into the conductor without validation. A crafted or stale serialized snapshot can therefore restore a child episode naming another desk or participant, bypassing the validation promised by resume and allowing invalid state to be used on subsequent waves. Validate each child state with the driver before constructing the conductor, returning an error if any child is invalid.
[RULE] validate-restored-state ·
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Resolved — the review agent found this finding fixed in the new code, as of 808b3a4.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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Actionable comments posted: 2
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Inline comments:
In `@crates/tinyhivemind-driver/src/conduct/mod.rs`:
- Around line 450-458: Update Conductor::resume to validate every child state
through CompletionDriver::resume before constructing the conductor, and collect
the validated children into the existing map. Validate restored shown cursors
against the corresponding concluded conversations before construction, rejecting
out-of-range values. Ensure parked seats are checked against participants in
their corresponding desk or child state, not only desk-state participants.
In `@crates/tinyhivemind-openhuman/src/episode/README.md`:
- Around line 24-27: Update the Journal hook-count description and list to
include checkpoint as the sixth optional hook, describing its role in storing a
settled snapshot. Leave the other hook descriptions unchanged.
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crates/tinyhivemind-driver/src/conduct/README.mdcrates/tinyhivemind-driver/src/conduct/child.rscrates/tinyhivemind-driver/src/conduct/mod.rscrates/tinyhivemind-driver/src/conduct/test/parked.rscrates/tinyhivemind-driver/src/conduct/wave.rscrates/tinyhivemind-driver/src/lib.rscrates/tinyhivemind-openhuman/src/episode/README.mdcrates/tinyhivemind-openhuman/src/episode/mod.rscrates/tinyhivemind-openhuman/src/episode/test/support.rscrates/tinyhivemind-openhuman/src/episode/test/watermark.rscrates/tinyhivemind-openhuman/src/lib.rs
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The checkpoint was written after the wave settled, so every row the wave had already committed was durable while the snapshot describing them was not. A crash in that window left the journal ahead of the state: the resumed conductor had folded none of those commits, re-proposed the seats that wrote them, and the desk ended with two completion rows for one assignment. `ConductorState` now carries the wave in progress -- what has been said and not yet committed, and the steps the host has not taken -- so a snapshot is exact rather than per-wave and a host checkpoints after every committed row. The residual window is that one row, and it is documented where a host will read it. `snapshot` answers `None` only while the host holds a commit whose sequence it has not reported, which is the one thing the conductor genuinely cannot know. A wave that commits nothing -- one that only parked or nudged a seat -- is checkpointed at its end, so the hold survives a restart too. Resuming drains the restored wave before proposing a new one, because `begin_wave` resets the phase. `Child::turned` is carried rather than skipped, now that a wave can come back mid-flight and the nudge owed to a silent askee rides on it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… form `finished` was quiescence plus no open conversation, which let an episode end with a seat still held on the host. A seat that broadcasts and parks in one turn can have its assignment discharged by that broadcast, so the desk goes quiescent while the host is still holding it; the loop broke out, and the approval the host queued had nowhere to return to when the operator answered it. A held seat now keeps the episode open, and releasing the last one is allowed to be what finishes it -- the loop asks whether the episode is over before asking for turns, because an empty wave with nothing parked reads as a stall. `ConductorState` is written down and read back across restarts and across upgrades, so its field names are the wire form, and only a same-process round trip covered them. A rename would have left every test green and every stored snapshot undecodable, losing exactly the episodes this work exists to save. Its keys are pinned now, as every other payload here is. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Requesting changes: 2 lane(s) blocking, worst finding is critical.
Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.
$0.0545 · 899,326 in / 52,321 out · 79,857 cached (9%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash, deepseek-v4-flash · 1,157 embedded
critique: $0.0321 · 496,245 in / 33,059 out · 47,838 cached (10%) · gpt-5.6-luna, deepseek/deepseek-v4-flash
security: $0.0200 · 370,410 in / 13,361 out · 32,019 cached (9%) · gpt-5.6-luna
description: $0.0004 · 17,061 in / 3,440 out · 0 cached (0%) · deepseek-v4-flash
| @@ -1,5 +1,6 @@ | |||
| //! One open conversation: a thread of the desk, run as its own episode. | |||
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| use serde::{Deserialize, Serialize}; | |||
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Use the existing resume API before importing child state
This import enables direct deserialization of Child, whose embedded DriverState must not be trusted as-is. The existing driver resume API is the validation boundary; ensure deserialized children are passed through it before they become conductor state rather than importing them directly.
[RULE] validated-import ·
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| // A conversation on the wire is its root paired with its record, and | ||
| // the record spells out both seats and the nudge it may still owe. | ||
| let child = &wire["children"][0][1]; |
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Read the serialized child map by its key
children is a map in ConductorState, and serde_json serializes maps as JSON objects keyed by the root rather than as an array of [key, value] pairs. Indexing the object with 0 yields a missing value, so the subsequent field assertions inspect null and the test panics. Locate the actual serialized root key (or inspect the object entries) before selecting the child.
[RULE] invalid-test-assumption ·
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Resolved — the review agent found this finding fixed in the new code, as of 808b3a4.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
| desk_name: snapshot.desk_name, | ||
| policy, | ||
| state, | ||
| children: snapshot.children.into_iter().collect(), |
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Validate every child before restoring it
driver.resume(snapshot.state) validates only the top-level episode. Each restored Child contains its own DriverState, but this line inserts those states directly into the conductor without calling driver.resume on them. A crafted or stale snapshot can therefore restore a child naming another desk or participant and that invalid state will be used on later waves. Validate every child state with the driver before constructing the conductor, and reject any inconsistent child/root mapping as part of restoration.
[RULE] validate-restored-state ·
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If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
| roster_version: 1, | ||
| thread_context: &[], | ||
| }; | ||
| let mut resumed = |
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Validate every child before restoring the conductor
This resume path still only exercises a snapshot with a valid top-level state. Conductor::resume validates snapshot.state, but restored child states are copied without being passed through the driver's validation, so a deserialized snapshot can carry a child naming an unknown desk or seat and still resume. Validate every child state before constructing the conductor; this remains an unfixed issue outside the changed test file and is marked late.
[RULE] validate-deserialized-state ·
| roster_version: 1, | ||
| thread_context: &[], | ||
| }; | ||
| let mut resumed = |
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Validate every child before restoring it
The new wire round-trip test only checks ordinary state and therefore does not prevent resume from accepting malformed child episodes. Each restored child contains its own driver state and participant identities, but the resume implementation validates only the parent state. Reject invalid child state before inserting it into the conductor; this remains an unfixed issue outside the changed test file and is marked late.
[RULE] validate-restored-state ·
| assert_eq!(child["askee"], json!("two")); | ||
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| // And it decodes back to the same thing. | ||
| let back: crate::ConductorState = serde_json::from_value(wire).expect("deserializes"); |
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Exercise the resume path instead of only deserializing
This only proves that ConductorState implements a compatible Serde shape; it never passes the restored state through the API that rebuilds a conductor. Consequently, invalid child state or inconsistent child roots would still be accepted by the production restart path without this test failing, despite the test name and comments claiming to cover what a restart reads back. Restore the snapshot with the existing resume API and assert the resulting conductor state, including rejection of malformed child state.
[RULE] test-coverage ·
| /// A conversation that concluded, kept for the context of the seats that had | ||
| /// it: shown whole once to each, on its next desk turn. | ||
| #[derive(Clone, Debug, Eq, PartialEq)] | ||
| #[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)] |
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Validate every child before restoring the conductor
Concluded conversations are also newly deserializable and carry participant identities and a root sequence. Restoring these records without checking that their participants and root agree with the supplied hive can leave the conductor with an invalid conversation context. Validate each restored child record and its consistency with the snapshot key before constructing the conductor.
[RULE] validate-restored-state ·
| ) | ||
| .expect("wave"); | ||
| wave_parking(&mut conductor, &journal, &[], &["two"]).expect("wave"); | ||
| let root = Sequence(2); |
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Derive the conversation root from the recorded commit
The test hard-codes the conversation root instead of using the sequence returned for the ask commit. If the journal starts at another watermark, or if setup emits one additional row before the ask, the resumed turn can be rooted at the wrong sequence and this test either fails spuriously or validates the wrong conversation. Capture the root from the first wave's commits, as the existing conversation tests do.
[RULE] avoid-hard-coded-identifiers ·
| /// seat asked concludes with `complete_episode`, and its message is the | ||
| /// answer; a follow-up is a further ask. | ||
| #[derive(Clone, Debug)] | ||
| #[derive(Clone, Debug, Deserialize, Serialize)] |
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Use an existing resume API before importing child state
Adding Deserialize makes Child.state caller-controlled snapshot data, but conductor restoration validates only the top-level state. A crafted child can therefore name an out-of-hive desk or participant and be used in later waves without the driver's checks. Validate each child state with driver.resume before inserting it into the conductor.
Additional critique observation
Validate every child before restoring it
[RULE] validate-restored-state
Deriving Deserialize makes each child, including its embedded DriverState, restorable from a snapshot. The conductor's resume path validates only the top-level state and copies child states directly, so a crafted or stale snapshot can restore a child naming another desk or an unknown participant. Validate each child with the driver's resume API before inserting it into the conductor.
Additional critique observation
Validate every child state before restoring it
[RULE] validate-deserialized-state
The newly deserializable child contains caller-controlled episode, identity, receipt, and ledger state. Restoring it without passing it through CompletionDriver::resume bypasses the validation contract and allows invalid child state to be used on later waves. Route every child state through the existing resume API and reject the snapshot if any child fails validation.
Additional security observation
Validate every child before restoring the conductor
[RULE] validate-restored-state
This newly deserializable child carries its own DriverState, participant identities, desk identity, and root. Restoring it without driver.resume bypasses the validation performed for the top-level episode, allowing stale or tampered child conversations into subsequent waves. Validate every child before constructing the conductor.
Additional security observation
Validate every child state before restoring it
[RULE] validate-restored-state
Because Child is now deserialized, its embedded DriverState is untrusted input. The existing conductor resume path validates only snapshot.state; an invalid child state can bypass that check and later drive turns for an unknown desk or seat. Run every child state through the driver's resume validation before accepting the snapshot.
Additional security observation
Validate every child before restoring it
[RULE] validate-restored-state
The new deserialization boundary permits a snapshot to supply child identities and state independently of the top-level state. Without validating each child, a caller can restore a child naming another desk or unknown participant, or otherwise inconsistent conversation state, and the conductor will operate on it in a later wave. Reject invalid children before restoration.
[RULE] validate-deserialized-state ·
| desk_name: snapshot.desk_name.clone(), | ||
| thread_root: None, | ||
| }; | ||
| let conductor = Conductor::resume(driver, routing, policy, snapshot)?; |
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Validate every child before restoring it
This new public resume path accepts a snapshot whose child entries are restored through Conductor::resume. Each child must be validated against the supplied driver before it becomes live state; otherwise stale or tampered child episodes bypass the validation applied to the top-level episode. Reject the snapshot if any child is invalid.
Additional critique observation
Validate every child before restoring the conductor
[RULE] validate-restored-state
resume_episode accepts a deserialized ConductorState and passes it directly to Conductor::resume. The existing resume path validates the top-level driver state but, according to the current restoration flow, does not validate each restored child state or verify that each child map key matches its child root. A crafted or stale snapshot can therefore restore a child naming another desk or unknown seat and use it on a later wave. Validate every child state and its root/key consistency before constructing the conductor. This remains the same medium-severity concern raised earlier; the new public resume entry point keeps the path exposed.
Additional security observation
Validate every child state before restoring it
[RULE] validate-deserialized-state
resume_episode exposes deserialized ConductorState to the driver's resume path. The driver's resume implementation validates the top-level state but copies each child state's DriverState without validating it, allowing a crafted snapshot to introduce an invalid desk or participant that is later used by the conductor. Validate every child with the driver before constructing the resumed conductor.
Additional security observation
Validate every child before restoring the conductor
[RULE] validate-restored-state
The resumed conductor can contain child identities, desks, and roots that were not checked against the current driver. In addition to validating each child state, verify that every child map key agrees with its child root before restoring it, so a crafted snapshot cannot operate on an inconsistent conversation.
[RULE] validate-restored-state ·
`resume` put the desk episode through `driver.resume` and then copied everything else in raw. A snapshot is the host's file, not the conductor's memory, so a stale or crafted one could restore a conversation naming another desk or an unknown seat, a cursor pointing past the conversations it indexes -- which panics the first time that seat is briefed -- or a seat held that this desk does not seat, which nothing could ever release. Each failed later, where the cause is unrecoverable, or not at all. Every conversation now goes through the same `driver.resume` the desk episode does, a conversation filed under a root it does not call its own is refused, and so are an out-of-range cursor and a held seat that is not seated. `Error::InconsistentSnapshot` says which. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The previously-blocking findings are resolved. Clearing the changes request.
$0.0283 · 620,255 in / 44,621 out · 65,886 cached (11%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash · 1,174 embedded
critique: $0.0162 · 308,498 in / 21,367 out · 29,291 cached (9%) · gpt-5.6-luna, deepseek/deepseek-v4-flash
security: $0.0054 · 249,190 in / 9,428 out · 16,115 cached (6%) · gpt-5.6-luna
tests: $0.0031 · 26,806 in / 4,061 out · 1,280 cached (5%) · deepseek/deepseek-v4-flash
description: $0.0028 · 17,787 in / 7,071 out · 1,280 cached (7%) · deepseek/deepseek-v4-flash
| // The same validation the desk episode gets: the conversation | ||
| // names this desk, and its two seats are seats of this hive. | ||
| child.state = driver.resume(child.state)?; | ||
| children.insert(root, child); |
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Reject duplicate conversation roots during restore
snapshot.children is deserialized as a Vec, so a malformed or edited snapshot can contain the same root more than once. BTreeMap::insert silently replaces the earlier child, losing an active conversation while resume still returns Ok, contrary to the documented self-consistency validation. Check whether insertion replaced an existing entry and return Error::InconsistentSnapshot instead.
Additional security observation
Reject duplicate child roots during restore
[RULE] duplicate-state-key
Deserialization permits multiple entries with the same root, but BTreeMap::insert silently overwrites the earlier child. This makes the restored conductor depend on serialization order and can discard conversation state without an error. Reject duplicate roots instead of replacing an existing child.
[RULE] duplicate-key-overwrite ·
| Ok(Self { | ||
| driver, | ||
| routing, | ||
| chat: snapshot.chat, |
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Validate the restored desk identity against driver state
driver.resume(snapshot.state) validates the desk represented by the driver state, but the independently serialized chat and desk_name are copied without comparison. A snapshot with a valid state and altered top-level identity therefore resumes successfully while subsequent conductor operations use a different desk id or display name than the validated episode. Reject mismatches before constructing Self.
[RULE] inconsistent-restored-identity ·
| // later with nothing left to say why. | ||
| let mut children = BTreeMap::new(); | ||
| for (root, mut child) in snapshot.children { | ||
| if root != child.root { |
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Derive the conversation root from the recorded state
The check only proves that the serialized map key matches child.root; driver.resume(child.state) validates the desk and participants, but it does not validate the child's conversation root. A snapshot can therefore use the same arbitrary root in the map key and child.root while the embedded child.state records a different thread root (or no thread root), and resume will accept an internally inconsistent child. Compare the key with the conversation root recorded in child.state before inserting the child.
[RULE] inconsistent-state-validation ·
| // A seat held on the host that this desk does not seat would be held | ||
| // for ever: it is never proposed, and nothing can release it into a | ||
| // wave. | ||
| for seat in snapshot.parked.keys() { |
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Validate every parked thread reference
Only the parked seat is validated here. A serialized snapshot can give a seated agent Some(root) for a root that is absent from snapshot.children (or belongs to another conversation), and resume still succeeds. The later release/resume path will then operate on a nonexistent or mismatched conversation; the omitted validation is especially risky because the parked map is newly restored from untrusted serialized state. Validate each Some(root) against the restored child map and its participants before constructing the conductor.
[RULE] unvalidated-reference ·
| assert_eq!(child["askee"], json!("two")); | ||
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| // And it decodes back to the same thing. | ||
| let back: crate::ConductorState = serde_json::from_value(wire).expect("deserializes"); |
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Exercise the resume path instead of only deserializing
The test proves only that Serde can round-trip ConductorState; it never calls Conductor::resume, so validation of the restored driver, children, held seats, and desk cannot regress while this test remains green. Rebuild the conductor through the public resume API and drive it to the next expected state.
[RULE] resume-path-coverage ·
| &[("one", vec![super::support::ask("two", "which port?")])], | ||
| ) | ||
| .expect("wave"); | ||
| let snapshot = conductor.snapshot().expect("recordable"); |
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Capture and verify an in-progress checkpoint
This snapshot is taken only after wave has completely drained, so the test never verifies the documented replay boundary for a snapshot containing an unfinished wave or an uncommitted step. Construct a checkpoint while the wave still has work, restore it, and verify that the remaining steps and seat state are replayed exactly once.
Additional critique observation
Resume from the checkpoint to verify the replay boundary
[RULE] unverified-replay-boundary
The snapshot is taken after support::wave has finished, and the test only round-trips its JSON. It does not verify the documented checkpoint behavior that a restored conductor continues with the same wave/seat state and does not lose or duplicate work. Construct the restarted conductor from the decoded snapshot and drive it through step (and, if applicable, the uncommitted commit path) to assert the replay boundary rather than only checking serialization names.
[RULE] checkpoint-replay-coverage ·
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| // The same validation the desk episode gets: the conversation |
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Validate every child before restoring the conductor
driver.resume(child.state) validates the embedded driver state, but this loop never validates the child record's own root, asker, or askee against the restored episode and hive. A crafted snapshot can therefore restore a child whose metadata names seats or a conversation that does not match the desk state, and later conduct/briefing logic will operate on inconsistent participant identity. Validate each child record completely before inserting it, rejecting any root, asker, or askee that is not consistent with the episode and roster.
[RULE] validate-restored-state ·
1 participant
Summary
An episode could not survive a restart. A host that checkpointed
DriverStatecould resume the driver, but theConductorholds everything the driver does not: which conversations are open and who is in them, what each seat has been shown, which assignment each was last nudged for, which conversations concluded, and who is parked on the operator. All of it lived only in memory, so a restart mid-episode silently started the room over.Conductor::snapshotreturnsSomeonly between waves — every row committed, no step queued, no commit outstanding. That is the one moment a snapshot is true about the journal. Mid-wave the conductor holds rows the host has not appended and a commit whose sequence it has not been told, so a snapshot there would either lose those rows or duplicate them on resume; it answersNoneinstead.Conductor::resumerebuilds from one, on a driver and a routing the host supplies again. Neither is in the snapshot on purpose: a router is a live object, and a policy an operator changed between restarts should be the new one.The loop checkpoints once per settled wave through a new
Journal::checkpoint, andresume_episodeisrun_episodeopened from a snapshot rather than a door.Related issue
None; the last of the four follow-ups from #72, and the one OpenCompany's own hive driver already needs — it checkpoints driver state today and would regress if it moved to
run_episodewithout this.API or behavior changes
tinyhivemind-driver:ConductorState,Conductor::snapshot,Conductor::resume.tinyhivemind-openhuman:resume_episode,Journal::checkpoint(defaulted, so a host that keeps nothing is unaffected).run_episodenow callscheckpointonce per settled wave. The default does nothing.ChildandConcludedgain serde.Child::turnedis#[serde(skip)]: it is within-wave bookkeeping, false wherever a snapshot is taken.Validation
Run from the repository root, all passing:
cargo fmt --all -- --checkcargo clippy --all-targets --all-features -- -D warningscargo test --all-features(36 suites)RUSTDOCFLAGS="-D warnings" cargo doc --no-deps --all-featurescargo llvm-cov --workspace --all-targets --all-features: no file under the 90% gateTests
conduct/test/parked.rs: a snapshot taken with a conversation open and a seat parked, round-tripped through JSON and resumed onto a fresh conductor — the hold survives, the turn count carries, and the conversation concludes after the restart; and a snapshot refused while a commit is in flight.episode/test/watermark.rs: an episode checkpointed every wave, stopped parked, and resumed from its last snapshot in a fresh runner — the held seat is not proposed again.Documentation
conduct/README.mdgains the checkpointing rule;episode/README.mddocumentscheckpointandresume_episode.Checklist
Summary by CodeRabbit
New Features
Documentation