Appendix: Host ABI Error Codes

Generated from the error-code variants in wit/host/*.wit. Every fallible host function returns result<_, error-code>. The unknown(string) arm carries a host-formatted detail string and is the catch-all; the named arms let a capsule match a specific failure without parsing text.

approval@1.0.0

invalid-input, timeout, store-unavailable, unknown(string)

elicit@1.0.0

not-in-lifecycle, timeout, cancelled, invalid-input, store-unavailable, unknown(string)

fs@1.0.0

not-found, access, capability-denied, boundary-escape, invalid-path, would-block, is-directory, not-directory, not-empty, too-large, quota, cross-vfs, already-exists, closed, unknown(string)

http@1.0.0

capability-denied, invalid-request, dns-error, airlock-rejected, tls-error, timeout, connection-error, body-too-large, closed, quota, protocol(string), unknown(string)

identity@1.0.0

capability-denied, invalid-input, user-not-found, link-not-found, already-linked, store-unavailable, unknown(string)

io@1.0.0

invalid-input, closed, too-large, cancelled, unknown(string)

ipc@1.0.0

capability-denied, invalid-input, closed, rate-limited, backpressure, quota, timeout, unknown(string)

kv@1.0.0

invalid-key, too-large, quota, cas-mismatch, unknown(string)

net@1.0.0

would-block, closed, capability-denied, airlock-rejected, connection-refused, connection-reset, timeout, address-in-use, address-not-available, name-unresolvable, invalid-handle, not-tcp, quota, unknown(string)

process@1.0.0

capability-denied, invalid-input, boundary-escape, quota, too-large, closed, cancelled, wait-timeout, unknown(string)

sys@1.0.0

capability-denied, config-key-reserved, too-large, registry-unavailable, cancelled, unknown(string)

uplink@1.0.0

capability-denied, invalid-input, invalid-profile, unknown-uplink, no-session, quota, unknown(string)