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feat: pause an agent's turn loop without stopping its container

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A paused agent keeps its container, its claude session and its
dashboard/todo servers up, but stops driving turns. Messages queue
unacked and are drained on resume.

The whole protocol is a single marker file, `<harness>/paused`. That
directory is already a bind-mount shared between host and container, so
both sides just stat the same path: the harness reads it to decide
whether to drive a turn, hive-c0re reads it to render the badge and
writes/removes it for `hivectl pause|resume`. No new wire protocol, no
container round-trip, and it is sticky across restarts by construction.

Not calling `recv_next` while paused *is* the queueing semantic, so
there is no fencing to get wrong: reminders buffer in their unbounded
channel, the todo `Notify` permit coalesces, and a `request_next_turn`
that raced the pause survives because the gate sits above
`self_continue.take()`.

Graceful stop is handled host-side rather than in the harness: a paused
agent provably has no turn in flight, so `run_signal` skips the fence
entirely instead of eating the full `GRACEFUL_STOP_TIMEOUT` waiting for
a checkpoint turn that will never run.

`paused` is reported on `ContainerView` / `AgentStatusRow` for the
dashboard, orthogonal to `running` and reported for stopped containers
too.

Closes: hyperhive/hyperhive issue 2271
This commit is contained in:
atlas 2026-07-26 02:31:54 +02:00 • committed by mara
commit 31008c83df
14 changed files with 305 additions and 1 deletions
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18
hive-sh4re/src/lib.rs
View file

@ -366,6 +366,18 @@ pub struct ContainerInfo {
/// projection of the dashboard's per-agent `ContainerView`. Carries the
/// agent's running/health flags plus the technical state an operator
/// wants in a roster overview (`hivectl agents list`).
//
// Four orthogonal, independently-observed facts about one agent, each
// rendered as its own column/token by `hivectl agents list` and read
// individually by `--json` consumers. Any combination is meaningful
// (a stopped agent can be paused and need an update), so folding them
// into a state machine or nested flag structs would only add
// `serde(flatten)` indirection to preserve the same flat JSON. Same
// rationale as `LifecycleScope` in hive-host-sock.
#[allow(
clippy::struct_excessive_bools,
reason = "flat wire projection of independent per-agent flags"
)]
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AgentStatusRow {
/// Logical agent name (no `h-` prefix).
@ -385,6 +397,12 @@ pub struct AgentStatusRow {
/// Count of this agent's pending reminders.
#[serde(default)]
pub pending_reminders: u64,
/// The agent's turn loop is parked (pause marker present in its
/// harness dir): the container may well be up and serving, it just
/// drives no turns. Orthogonal to `running` — an agent can be
/// paused while stopped, and pause survives a restart.
#[serde(default)]
pub paused: bool,
/// Parent in the topology tree. `None` marks a root-level agent.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub parent: Option<String>,