zerolang

Build And Runtime

Target Capabilities

Current host and target-neutral capability boundaries.

Capabilities Are Target Facts

In Zerolang, start with the user request. The agent should inspect target capability facts before patching APIs that depend on hosted runtime support.

make this cli work on linux musl too
I’ll check the target facts and call out anything that blocks the port.

What This Means

Zero does not assume every target can do filesystem, network, process, time, or random operations. Those are explicit target facts. Target JSON includes host identity, aliases, object formats, C target mapping, capabilities, HTTP runtime metadata, and targetToolchains.

Inspect Targets

zero targets
zero targets --json
zero check --json --target linux-musl-x64 examples/memory-package

Hosted Capabilities

The current hosted capability set includes:

  • args
  • env
  • fs
  • memory
  • net
  • proc
  • rand
  • stdio
  • time

Non-host targets expose only the capabilities listed for that target. Network support is intentionally target-gated. HTTP helpers that only parse or write request/response envelopes are target-neutral; hosted fetch and listen require network-capable host support.

Capability Failure Is A Feature

If a graph input uses std.fs on a target that cannot provide filesystem support, zero check --target ... should report a diagnostic instead of silently changing behavior.

zero check --json --target linux-musl-x64 conformance/common/fail/unsupported-target-feature.graph

The diagnostic is TAR002 and the repair id points at choosing a target with the required capability.

What To Remember

Capabilities are part of the graph contract. Standard library pages document effects and target support so an agent can choose the right helper before it patches the program.