Appendix D — Default limits and how to change them
The runtime enforces resource limits on every invocation (9.5). The defaults
below are operator-configurable; a breach returns limit_exceeded (503) naming
the limit.
Invocation / tenant limits
| Limit |
Default |
On breach |
| Wall clock — service |
30 s |
limit_exceeded wall_clock_ms; invocation terminated |
| Wall clock — pipeline |
120 s |
as above |
| Memory |
128 MB |
limit_exceeded memory_bytes; isolate killed (no process impact) |
| Materialized body |
100 MB |
payload_too_large / limit_exceeded |
| Concurrent invocations / tenant |
64 |
Excess fails fast 503 — no queueing |
| Outbound calls / invocation |
64 |
limit_exceeded |
| Call depth |
16 |
limit_exceeded |
| Pipeline fan-out |
1000 |
limit_exceeded |
Circuit breaker
| Parameter |
Default |
| Breach threshold |
8 within 10 s |
| Cooldown |
5 s (with Retry-After) |
| Trip key |
limit: "tenant_breaker" |
Only genuine wall-clock/memory/materialization breaches feed the breaker;
admission (concurrency) rejections do not (9.5).
Idempotency
| Parameter |
Default |
| Replay window |
24 h |
| Stored body cap |
1 MB |
| Key length cap |
256 chars |
| Parameter |
Default |
Cap |
$take (listings) |
1000 |
10000 |
$take (query results) |
varies by service |
10000 |
$take (log reader) |
100 |
10000 |
Pipeline defaults
| Parameter |
Default |
| Subpipeline/split concurrency |
12 |
| Segment snapshot threshold (streaming opt-out) |
1 MB |
| Retry |
none (until a policy is set) |
Changing them
These are operator-level settings, tuned where the node and its limits are
configured (not in tenant config — a tenant can't widen its own limits, by
design). Adjust them at the deployment/embedding layer; the trait and config
surfaces are stable. As an application author, treat the defaults as the contract
and design within them (8.8): finish inside the wall-clock budget, bound your
memory and fan-out, and respect Retry-After on limit_exceeded.
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