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discover-running-nodes

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更新时间2026年7月23日 23:12

Enumerate the live StreamLib runtimes reachable over their control plane so you can pick a target before running any other control verb. Use when you need to know which running nodes exist — after `cargo run`-ing an example app in a worktree, when a control verb errors that zero or more-than-one node is live, or any time you must resolve a `runtime_id` / `control_url` to drive. Wraps `streamlib nodes` only.

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来源

tatolab

tatolab/streamlib

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discover-running-nodes

The entry point for every control-verb workflow: list the running nodes so a later verb can target one. A StreamLib node appears here only if its graph hosts an @tatolab/api-server/ApiServer processor — that processor is what binds a POST /mcp control endpoint and registers the node under $XDG_RUNTIME_DIR/streamlib/nodes/<runtime_id>.json. A runtime with no control endpoint is intentionally absent, not missing.

Steps

1. List the nodes

streamlib nodes

This scans the registry, liveness-checks every entry (a graph control-plane round-trip plus, on unix, a host-pid check), prunes the entries that are definitively gone (unreachable AND no live pid), and prints an aligned table:

RUNTIME_ID  CONTROL_URL            PID    ALIVE?  HINT
Rabc123     http://127.0.0.1:8080  12345  yes     streamlib (/path/to/app)

RUNTIME_ID — pass to any control verb as --node <runtime_id>.
CONTROL_URL — pass to any control verb as --url <control_url> (its POST /mcp base).
PID — the host process; teardown-running-node signals this to stop the node.
ALIVE? — control-plane reachability (yes means a graph round-trip answered). An entry can show no transiently (pid still alive, control plane briefly slow) without being pruned.
HINT — a human breadcrumb (e.g. the app's cwd).

2. Read the outcome

One yes row — that is your target; control verbs with neither --url nor --node default to this sole live node, so you can often skip pinning entirely.
Several yes rows — pick one and pin it with --node <runtime_id> (or --url) on every subsequent verb; a verb given neither flag with more than one live node errors and lists the candidates.
No running nodes found — start a node first (cargo run an example app whose graph hosts an ApiServer processor), then re-run.

Notes

No flags. streamlib nodes takes none.
When the control plane requires auth, export STREAMLIB_MCP_TOKEN before running — it rides the liveness probe (and every control verb) as an authorization: Bearer header.
To pin the chosen target and health-check it in one move, hand off to drive-running-node.

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name

discover-running-nodes

description

discover-running-nodes

Steps

1. List the nodes

streamlib nodes

RUNTIME_ID  CONTROL_URL            PID    ALIVE?  HINT
Rabc123     http://127.0.0.1:8080  12345  yes     streamlib (/path/to/app)

RUNTIME_ID — pass to any control verb as --node <runtime_id>.
CONTROL_URL — pass to any control verb as --url <control_url> (its POST /mcp base).
PID — the host process; teardown-running-node signals this to stop the node.
ALIVE? — control-plane reachability (yes means a graph round-trip answered). An entry can show no transiently (pid still alive, control plane briefly slow) without being pruned.
HINT — a human breadcrumb (e.g. the app's cwd).

2. Read the outcome

One yes row — that is your target; control verbs with neither --url nor --node default to this sole live node, so you can often skip pinning entirely.
Several yes rows — pick one and pin it with --node <runtime_id> (or --url) on every subsequent verb; a verb given neither flag with more than one live node errors and lists the candidates.
No running nodes found — start a node first (cargo run an example app whose graph hosts an ApiServer processor), then re-run.

Notes

No flags. streamlib nodes takes none.
When the control plane requires auth, export STREAMLIB_MCP_TOKEN before running — it rides the liveness probe (and every control verb) as an authorization: Bearer header.
To pin the chosen target and health-check it in one move, hand off to drive-running-node.