CLI reference

The sle binary ships as a single subcommand — simulate. Four flags cover every supported mode: devnet, mainnet, custom RPC, offline, human output, JSON output.

Invocation

sle --help
sle 0.1.0
Solana Transaction Legibility & Simulation Engine

USAGE:
    sle <COMMAND>

COMMANDS:
    simulate    Simulate a base64-encoded versioned transaction
                and print a legibility report.
    help        Print this message or the help of the given subcommand.

OPTIONS:
    -V, --version    Print version info
    -h, --help       Print help

sle simulate

sle simulate --help
Simulate a base64-encoded versioned transaction and print a
legibility report.

USAGE:
    sle simulate [OPTIONS] --tx <BASE64>

OPTIONS:
    --tx <BASE64>
        Base64-encoded serialized VersionedTransaction.
        Required.

    --rpc <ENDPOINT>
        RPC endpoint to use. Accepts one of the named aliases
        "devnet" or "mainnet" / "mainnet-beta", or any
        fully-qualified https:// URL.
        [default: devnet]

    --offline
        Skip RPC simulation entirely. Runs the decoder and
        classifier against the transaction's static structure
        only. No network access required.
        Useful for auditing a tx before it touches any RPC,
        and for programs that may not be deployed on the
        current cluster.

    --json
        Emit raw JSON (LegibilityReport) instead of the
        human-readable terminal format. Stable shape, safe
        to pipe into jq or downstream tooling.

    -h, --help
        Print help

Examples

Simulate against public devnet

devnet · human output
$ sle simulate --tx "$BASE64_TX" --rpc devnet

Simulate against mainnet-beta

mainnet · human output
$ sle simulate --tx "$BASE64_TX" --rpc mainnet

Offline — no network, structure-only

offline · human output
$ sle simulate --tx "$BASE64_TX" --offline

Offline + JSON — pipeline mode

offline · json · jq
$ sle simulate --tx "$BASE64_TX" --offline --json | jq '.overall_risk'
"Critical"

$ sle simulate --tx "$BASE64_TX" --offline --json \
    | jq '.instructions[] | {program: .program_name, risk: .risk}'

Exit codes