Hand the host-agnostic half of workflows to tinyflows - #266
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senamakel merged 3 commits intoAug 13, 2026
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📝 WalkthroughWalkthroughThe change moves host capabilities, workflow models, storage, diagnosis, and editing APIs to Changestinyflows migration
Estimated code review effort: 5 (Critical) | ~120 minutes Mergeability Score: 🔵 Low · up to The workflow migration leaves one explicit-home TUI path without host-specific validation at load and edit time, so unsupported harness selections may persist and fail only when a run starts; execution-time checks still prevent dispatch. The change is mergeable with explicit owner awareness and follow-up to route that path through the policy-attaching factory, plus a small test-helper fix for repeated waits. Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1⚔️ Resolve merge conflicts 💡
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Inline comments:
In `@src/sdk/src/workflows/store/tests.rs`:
- Around line 90-93: Update the comment in
a_discovered_store_refuses_a_defaults_block_naming_something_that_cannot_be_a_harness
to refer to MedullaPolicy instead of MedullaDefaults; leave the test behavior
unchanged.
In `@src/sdk/tests/feature_workflow_dispatch.rs`:
- Around line 239-249: Update wait_for so it removes and returns the matching
frame from self.seen instead of cloning it through iter().find; preserve the
existing deadline behavior and ensure remaining seen frames are still reported
as unconsumed.
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📒 Files selected for processing (81)
Cargo.tomlscripts/init-submodules.shsrc/sdk/src/daemon/task_loop/workflow/handle.rssrc/sdk/src/flow_engine/README.mdsrc/sdk/src/flow_engine/agent_evidence/tests.rssrc/sdk/src/flow_engine/caps/README.mdsrc/sdk/src/flow_engine/caps/code.rssrc/sdk/src/flow_engine/caps/http.rssrc/sdk/src/flow_engine/caps/mocks.rssrc/sdk/src/flow_engine/caps/mod.rssrc/sdk/src/flow_engine/caps/script.rssrc/sdk/src/flow_engine/caps/script_policy.rssrc/sdk/src/flow_engine/caps/script_policy_tests.rssrc/sdk/src/flow_engine/caps/script_tests.rssrc/sdk/src/flow_engine/caps/state.rssrc/sdk/src/flow_engine/observability.rssrc/sdk/src/flow_engine/tests/dry_run_tests.rssrc/sdk/src/flow_engine/tests/http_tests.rssrc/sdk/src/flow_engine/tests/mod.rssrc/sdk/src/flow_engine/tests/state_tests.rssrc/sdk/src/flow_engine/tests/tools_tests.rssrc/sdk/src/harness_transcript/types.rssrc/sdk/src/mcp/tests/runs.rssrc/sdk/src/ui/workflows/graph.rssrc/sdk/src/ui/workflows/rows_tests.rssrc/sdk/src/ui/workflows/run_view.rssrc/sdk/src/ui/workflows/run_view_tests.rssrc/sdk/src/workflows/README.mdsrc/sdk/src/workflows/authoring.rssrc/sdk/src/workflows/authoring_tests.rssrc/sdk/src/workflows/dispatch_error.rssrc/sdk/src/workflows/evolve/verify.rssrc/sdk/src/workflows/gates/bindings.rssrc/sdk/src/workflows/gates/mod.rssrc/sdk/src/workflows/gates/tests.rssrc/sdk/src/workflows/mod.rssrc/sdk/src/workflows/ops/graph.rssrc/sdk/src/workflows/ops/mod.rssrc/sdk/src/workflows/ops/runs/tests.rssrc/sdk/src/workflows/ops/runs/view.rssrc/sdk/src/workflows/registry.rssrc/sdk/src/workflows/run/diagnose.rssrc/sdk/src/workflows/run/diagnose_tests.rssrc/sdk/src/workflows/run/mod.rssrc/sdk/src/workflows/run/preflight.rssrc/sdk/src/workflows/run/tests/cases/finalize.rssrc/sdk/src/workflows/skills/refresh.rssrc/sdk/src/workflows/skills/refresh_tests.rssrc/sdk/src/workflows/store/concurrency_tests.rssrc/sdk/src/workflows/store/file/dirs.rssrc/sdk/src/workflows/store/file/document.rssrc/sdk/src/workflows/store/file/journal/mod.rssrc/sdk/src/workflows/store/file/journal/persistence.rssrc/sdk/src/workflows/store/file/journal/prune.rssrc/sdk/src/workflows/store/file/journal/tests.rssrc/sdk/src/workflows/store/file/mod.rssrc/sdk/src/workflows/store/file/paths.rssrc/sdk/src/workflows/store/file/proposals/mod.rssrc/sdk/src/workflows/store/file/proposals/tests.rssrc/sdk/src/workflows/store/file/revisions.rssrc/sdk/src/workflows/store/file/revisions_tests.rssrc/sdk/src/workflows/store/mod.rssrc/sdk/src/workflows/store/tests.rssrc/sdk/src/workflows/store/tests/discovery.rssrc/sdk/src/workflows/store/tests/evolution_scope.rssrc/sdk/src/workflows/store/tests/history.rssrc/sdk/src/workflows/store/tests/mod.rssrc/sdk/src/workflows/store/tests/parsing.rssrc/sdk/src/workflows/store/tests/path_guards.rssrc/sdk/src/workflows/store/tests/persistence.rssrc/sdk/src/workflows/store/tests/runs.rssrc/sdk/src/workflows/types/error.rssrc/sdk/src/workflows/types/mod.rssrc/sdk/src/workflows/types/note.rssrc/sdk/src/workflows/types/proposal.rssrc/sdk/src/workflows/types/run.rssrc/sdk/src/workflows/types/tests.rssrc/sdk/src/workflows/types/workflow.rssrc/sdk/tests/feature_workflow_dispatch.rssrc/tui/src/ui/app/render/workflows/node_preview/types.rsvendor/openhuman
💤 Files with no reviewable changes (42)
- src/sdk/src/flow_engine/caps/script_tests.rs
- src/sdk/src/flow_engine/caps/script_policy_tests.rs
- src/sdk/src/flow_engine/tests/state_tests.rs
- src/sdk/src/flow_engine/caps/state.rs
- src/sdk/src/flow_engine/caps/script.rs
- src/sdk/src/workflows/store/concurrency_tests.rs
- src/sdk/src/workflows/store/file/proposals/mod.rs
- src/sdk/src/workflows/types/note.rs
- src/sdk/src/flow_engine/tests/http_tests.rs
- src/sdk/src/flow_engine/caps/mocks.rs
- src/sdk/src/workflows/store/tests/history.rs
- src/sdk/src/workflows/store/file/journal/tests.rs
- src/sdk/src/workflows/store/file/journal/mod.rs
- src/sdk/src/workflows/store/file/paths.rs
- src/sdk/src/flow_engine/caps/http.rs
- src/sdk/src/flow_engine/caps/code.rs
- src/sdk/src/workflows/store/tests/parsing.rs
- src/sdk/src/workflows/store/tests/mod.rs
- src/sdk/src/workflows/store/file/journal/persistence.rs
- src/sdk/src/workflows/store/tests/persistence.rs
- src/sdk/src/workflows/run/diagnose.rs
- src/sdk/src/workflows/run/diagnose_tests.rs
- src/sdk/src/workflows/store/file/revisions_tests.rs
- src/sdk/src/workflows/types/tests.rs
- src/sdk/src/workflows/store/tests/runs.rs
- src/sdk/src/workflows/store/file/journal/prune.rs
- src/sdk/src/workflows/types/error.rs
- src/sdk/src/workflows/store/tests/path_guards.rs
- src/sdk/src/workflows/types/mod.rs
- src/sdk/src/workflows/store/file/document.rs
- src/sdk/src/workflows/store/file/dirs.rs
- src/sdk/src/workflows/store/tests/evolution_scope.rs
- src/sdk/src/workflows/store/file/revisions.rs
- src/sdk/src/workflows/store/tests/discovery.rs
- src/sdk/src/flow_engine/caps/script_policy.rs
- src/sdk/src/workflows/types/proposal.rs
- src/sdk/src/workflows/gates/bindings.rs
- src/sdk/src/workflows/store/file/proposals/tests.rs
- src/sdk/src/workflows/authoring.rs
- src/sdk/src/workflows/store/file/mod.rs
- src/sdk/src/workflows/types/run.rs
- src/sdk/src/workflows/types/workflow.rs
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…flows
Two large bodies of code in this crate were never about Medulla, and the sibling
hosts embedding the same engine needed every part of them:
- flow_engine/caps/{script,script_policy,code,state,http,mocks} — running a
script out of process, bounding which files it may reach, keying state onto
disk, refusing an outbound URL that resolves into a private range.
- workflows/{types,store,authoring} — the durable model around a graph, the JSON
store behind it, and patch-based editing; plus run diagnosis, the
=-expression binding reader, and the authoring gates that are true on any
host.
All of it now lives in tinyflows (`caps::host`, `store`, `gates`, `bindings`)
and is re-exported from where it used to be, so a call site in this crate still
writes `crate::workflows::WorkflowRecord`,
`crate::workflows::authoring::apply_workflow_ops`, and
`crate::flow_engine::caps::script`.
What stays is what genuinely needs this host's vocabulary, injected into the
engine rather than assumed by it: the harness dispatch and the `medulla:` tool
namespace, the `.medulla` home layout, the harness gate, and the hub-error
conversion. `MedullaPolicy` implements both halves of tinyflows' `HostPolicy` —
the harness rule for a `defaults` block, and the engine's gates plus this host's
for a graph — and `workflows::store::discover` installs it, so a document naming
a harness Medulla does not have is refused at load and an edit introducing one
is refused before it lands.
Two things fall out of the move rather than being chosen:
- The engine's `shell` node is wired to a real runner for the first time. It had
a trait and no implementation anywhere; Medulla's script executor is what made
the node implementable, and it is offered on exactly the same condition as
`code` nodes.
- `ui::workflows::run_view` now asks `tinyflows::store::is_truncated` instead of
matching a literal marker key, so a run record written by an older build still
renders as an elision rather than as an object full of our own bookkeeping.
Co-authored-by: Medulla <medulla@tinyhumans.ai>
`wait_for` kept the frames it drained in a vector local to one call, and `drain_inbox` is destructive: a frame pulled off the peer's queue while waiting for a *different* kind was gone. An `Ack` and the `Reply` that follows it routinely arrive inside one drain window, so waiting for the Ack consumed the Reply, and the next wait then timed out on a deadline having seen nothing at all. The buffer now lives in an `Inbox` that spans the whole test. This was never a product bug — the run completed correctly every time, and the harness simply won the race until the engine got fast enough to lose it. It surfaced as `a_frame_naming_a_workflow_runs_the_whole_graph_on_the_worker` hanging for its full ten seconds after an engine bump, which reads exactly like a deadlock in the dispatch path and is not one. Co-authored-by: Medulla <medulla@tinyhumans.ai>
…kstep Moves `vendor/openhuman` to `5698b03`, which carries the tinyflows bump (tinyhumansai/openhuman#5537) and so the engine this crate's workflow code now depends on. The bump needed three things beyond the gitlink, and the first two are the kind that fail loudly at resolution rather than quietly at run time: - `tinycortex-api` added to `[patch.crates-io]`. `tinymemory-core` names it by version requirement while this graph depends on tinycortex by path, so without the entry Cargo goes to crates.io for a crate that is not published there and the workspace does not resolve at all. - `motosan-ai-oauth` added for the same reason the tiny* crates are patched: OpenHuman vendors its own copy, this table is the only one Cargo reads, and an entry missing here silently resolves the published crate instead of the vendored tree. - `scripts/init-submodules.sh` extended to ten crates — the file's own comment requires it to stay in lockstep with the patch table, and it was three short. The script stays deliberately non-recursive, now with a comment saying why: tinyflows and tinymemory vendor crates of their own, and none of those nested copies is ever resolved, because the root patch table redirects each name to the copy beside OpenHuman. Initializing them recursively would clone hundreds of megabytes nothing links and leave two checkouts of one crate on disk. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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PR babysitter status Head:
Unresolved threads: 0. Review-bot changes-requested: cleared (re-requested review after the fixes). Not merging this PR myself. |
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The last of a three-repo chain. tinyflows#42 and openhuman#5537 are both merged; this is Medulla's side of the same move.
What moved, and why
Two large bodies of code in this crate were never about Medulla. A workflow document is the engine's own graph plus bookkeeping, and every host embedding that engine needs the same bookkeeping — so each one that wrote it itself rewrote the same subtle parts: the stdin/stdout deadlock in a script runner, the DNS-rebinding window between vetting a host and connecting to it, the traversal check that has to canonicalize because a symlink inside the workspace can still point out of it.
flow_engine/caps/{script,script_policy,code,state,http,mocks}tinyflows::caps::hostworkflows/{types,store}tinyflows::storeworkflows/authoring.rstinyflows::store::authoringworkflows/run/diagnose.rstinyflows::store::types::diagnosisworkflows/gates/bindings.rstinyflows::bindingstinyflows::gatesEverything is re-exported from where it used to be, so a call site still writes
crate::workflows::WorkflowRecord,crate::workflows::authoring::apply_workflow_ops, andcrate::flow_engine::caps::script. The diff is large but the API surface of this crate is essentially unchanged.What deliberately stayed
The parts that need this host's vocabulary, injected into the engine rather than assumed by it: the harness dispatch and the
medulla:tool namespace, the.medullahome layout, the harness gate, and the hub-error conversion.MedullaPolicyimplements both halves of tinyflows'HostPolicy— the harness rule for adefaultsblock, and the engine's gates plus this host's for a graph — andworkflows::store::discoverinstalls it. So a document naming a harness Medulla does not have is still refused at load, and an edit introducing one is refused before it lands, exactly as before. That guarantee was the main thing at risk in this move and there is a test for each half.Two things that fall out of the move
shellnode has a real runner for the first time. It had a trait and no implementation anywhere. Medulla's script executor is what made the node implementable, and it is offered on exactly the same condition ascodenodes — both run an author's script with the daemon's privileges, so a host that refused one and allowed the other would be drawing a line that does not exist.run_viewasksis_truncatedinstead of matching a literal marker key. The engine owns that bounding now; a run record is written once and never revised, so older records carrying the previous key still render as an elision rather than as an object full of our own bookkeeping.The vendor bump is not just a gitlink
vendor/openhumanmoves to5698b03, and two[patch.crates-io]entries had to come with it — both the kind that fail at resolution, not at run time:tinycortex-api:tinymemory-corenames it by version requirement while this graph depends on tinycortex by path, so without the entry Cargo goes to crates.io for a crate that is not published and the workspace does not resolve at all.motosan-ai-oauth: OpenHuman vendors its own copy, and this table is the only one Cargo reads.scripts/init-submodules.shwas three crates short of the table its own comment says it must match; it now initializes ten. It stays deliberately non-recursive, with a comment explaining why — tinyflows and tinymemory vendor crates of their own, none of those nested copies is ever resolved because the root table redirects each name to the copy beside OpenHuman, and cloning them would pull hundreds of megabytes nothing links.A test-harness bug, found not written
feature_workflow_dispatch'swait_forkept drained frames in a vector local to one call, anddrain_inboxis destructive — so a frame pulled while waiting for a different kind was discarded. AnAckand itsReplyroutinely arrive in one drain window, so waiting for the Ack consumed the Reply and the next wait timed out having seen nothing. Never a product bug; the harness simply won that race until the engine got fast enough to lose it, and it presented as a ten-second hang that reads exactly like a deadlock in the dispatch path.Validation
cargo test --workspace(2545 tests, 70 suites),cargo clippy --all-targets -- -D warnings, andcargo fmt --all --check— all clean against merged openhumanmainand merged tinyflowsmain.Raised from a fork
The repository has an active "No other branches" ruleset, so this comes from
senamakel/medullarather than a branch here.Summary by CodeRabbit