feat(caps): CLI capability flags — allow-net/read/write/run (ILO-59)#606
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Add Deno-style `--allow-net`, `--allow-read`, `--allow-write`, `--allow-run` CLI flags to gate IO builtins at the process level (ILO-59). ## What ships - `src/caps.rs` — `Caps` / `Policy` structs, `parse_allow`, `check_net/read/write/run` helpers, and 26 unit tests. Denial messages now carry the `ILO-CAP-001` structured error code so agents can route on it. - `src/cli/args.rs` — four `Option<String>` fields on `RunArgs` wired to clap flags (`--allow-net`, `--allow-read`, `--allow-write`, `--allow-run`). - `src/main.rs` — `build_caps()` converts `RunArgs` flags into `Arc<Caps>`; `Caps::Permissive` is the default so no existing invocation changes behaviour. - `src/interpreter/mod.rs` + `src/vm/mod.rs` — `caps.check_*` calls at every IO builtin site. - `tests/capability_flags.rs` — 15 integration tests covering all four dimensions across both backends, plus `Caps::parse_allow` round-trips. - `examples/capability-sandbox.ilo` — runnable demo. - `SANDBOX.md` — operator guide: flag syntax, matching rules, capability matrix, recipes, backwards-compatibility note. - `ai.txt` + `SPEC.md` — capability matrix and flag reference added. ## Backwards compatibility `Caps::Permissive` is `#[default]`. Without any `--allow-*` flag the runtime is fully permissive — identical to pre-0.13 behaviour. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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This was referenced May 22, 2026
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Summary
--allow-net,--allow-read,--allow-write,--allow-runCLI flags that gate IO builtins at the process level--allow-*flag is present;Caps::Permissiveremains the default (zero flags = backwards-compatible, no restrictions)RErr value with codeILO-CAP-001so programs can pattern-match itWhat ships
src/caps.rsCaps/Policystructs,parse_allow,check_net/read/write/run, 26 unit testssrc/cli/args.rsOption<String>clap fields onRunArgs(--allow-net,--allow-read,--allow-write,--allow-run) — already present, no change neededsrc/main.rsbuild_caps()already present, no change neededsrc/interpreter/mod.rscaps.check_*calls at every IO builtin site — already presentsrc/vm/mod.rscaps.check_*calls at every IO builtin site — already presenttests/capability_flags.rsexamples/capability-sandbox.iloSANDBOX.mdai.txtSPEC.mdTest plan
cargo test --test capability_flags— 15 tests, all passcargo test --lib caps— 26 unit tests, all passilo run --allow-net= examples/capability-sandbox.ilo— denied-read blocked as expectedilo run examples/capability-sandbox.ilo— permissive mode, all IO allowedFollow-up suggestions (not in scope for this PR)
Worldcapability parameter — per-function capability declarations (the language-level long-term move)--allow-envflag (env-read capability) —env-allbuiltin currently ungatedrun-spawned childrenilo servinheriting caps from the launch commandCloses ILO-59.
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