How a gate works
A gate is a bead like any other: created open, it blocks its waiters through a normal dependency edge, and the step becomes ready the moment the gate closes. Gates close in one of two ways:- Manually —
bd gate resolve <gate-id>(human gates always close this way). - Via
bd gate check— evaluates open timer and GitHub gates against the real world and closes the ones whose condition is met.
Gate types
Timeouts use Go duration syntax:
30m, 1h, 24h (there is no d unit —
write 24h, not 1d).
GitHub gates use the current Git repository by default. To evaluate a PR or
workflow run in another repository, set the gate’s string metadata.repo value
to OWNER/REPO or HOST/OWNER/REPO. An ad-hoc gh:run/gh:pr gate created
with bd gate create inherits a valid metadata.repo value from the issue it
blocks; human/timer/bead gates do not, since metadata.repo is
unrelated, ordinary metadata for those types. bd gate check rejects
malformed repository values instead of falling back to the current
repository.
Gates in formulas
A formula step declares a gate with a[steps.gate] block. When the formula
is instantiated, bd creates the gate issue and wires it as a blocker of that
step. The schema has five fields: type, id, await_id, timeout, and
repo.
This is the release gate from beads’ own release formula — the step that
waits for the GitHub release workflow:
gh:run or gh:pr gate that watches another repository, set repo
the same way a metadata.repo value works for an ad-hoc gate — OWNER/REPO
or HOST/OWNER/REPO. Malformed values are rejected when the gate is checked:
repo accepts a {{var}} placeholder (e.g. repo = "{{gate_repo}}"); for a
formula persisted with bd cook --persist, the placeholder is substituted
when the proto is later poured with bd mol pour --var gate_repo=..., the
same as title, description, and await_id.
bd gate discover (auto-discovery of a gh:run gate’s run ID) requires a
workflow name hint (await_id/id, not left blank) for a gate targeting
another repository — without one, the local commit/branch heuristics that
narrow a same-repo match don’t apply across repos, so nothing but the
workflow name can identify the right run. A cross-repo gate discovery also
ignores the local checkout’s branch unless --branch is passed explicitly;
an auto-detected local branch has no relationship to the target repo’s
branches.
A human sign-off gate:
Creating gates outside formulas
bd gate create attaches a gate to existing work:
Fan-in: waiting on other steps
Waiting on other steps is not a gate — it’s a dependency. Useneeds to
fan in on named steps, and waits_for when a step must wait for
dynamically-created children:
Working with gated molecules
bd gate check on a schedule (cron, CI, or an
orchestrator loop) so timer and GitHub gates close without a human in the
loop; keep human gates for the decisions that should never auto-close.