Warp Simulate SVM Txs

Verify that a pending Sealevel (SVM) warp-route governance change produces the desired warp route config before it is submitted to mainnet or executed through a Squads multisig. This forks Solana mainnet locally with surfpool, replays the exact transactions that will be signed (base58 wire txs, not a re-derived approximation), then runs warp check against the target registry config.

This is the SVM side of the "fork → replay → check" loop (the Solana analog of /warp-simulate-safe-txs). It catches wrong owners, wrong ISMs, missing router enrollments, or bad gas/fee config that would otherwise only surface after the txs are executed on-chain.

Unlike the EVM Safe flow, SVM warp governance is same-domain: there is no ICA fan-out and no cross-fork relay to worry about. Impersonation is handled by surfpool's --skip-signature-verification, so the txs replay as-is even though you don't hold the authority's key.

When to use

• An engineer has an SVM warp-route config change (owner/ISM/router/gas/fee) and asks "do these txs lead to the desired config in registry PR #XXXX?"
• Before signing or executing any SVM warp-route governance transaction, including ones routed through a Squads vault.

Input Parameters

Parameter	Required	Description
warp_route_id	Yes	The warp route ID being changed, e.g. SOL/solanamainnet-....
svm_txs	Yes	The governance transactions to replay, as a PrintableSvmTransaction[] file — the output of warp apply --submitter file, or a Squads export in that shape.
target_config	Yes	The desired config to check against — usually a hyperlane-registry PR branch. Serve it via the local HTTP registry.

Prerequisites

• surfpool installed: the CLI warp fork SVM path runs a locally-installed surfpool binary (>= 1.5.0) on PATH — there is no Docker fallback. Install the pinned, checksum-verified release the way CI does — see the Install surfpool step in .github/workflows/test-cli-e2e.yml (a pinned v1.5.0 tarball verified against its SHA-256); do not pipe the mutable run.surfpool.run installer to a shell. If it's missing, warp fork aborts before replaying anything with a "surfpool 1.5.0+ is required" error.
• Monorepo root: MONOREPO_ROOT=$(git rev-parse --show-toplevel). Prefix CLI commands with cd $MONOREPO_ROOT &&.
• A local HTTP registry serving the target (PR) config (use /start-http-registry pointed at the PR branch, or pass --registry). warp fork reads the warp route from this registry to decide which chain to fork.
• A scratch dir, e.g. WORK=$(mktemp -d).

Instructions

Step 1 — Produce the transactions to replay (PrintableSvmTransaction[])

If you don't already have the tx file, generate it with warp apply and the file submitter, which writes the governance txs (as base58 wire transactions) to a file instead of submitting them:

# strategy.yaml — route the Sealevel chain's txs to a file
<sealevelChain>:
  submitter:
    type: file
    chain: <sealevelChain>
    filepath: <WORK>/svm-txs.json

cd $MONOREPO_ROOT && pnpm -C typescript/cli exec tsx cli.ts warp apply \
  --warpRouteId $WARP_ROUTE_ID --registry http://localhost:3333 \
  --strategy $WORK/strategy.yaml

The result is $WORK/svm-txs.json — a flat PrintableSvmTransaction[] array (each element carries transaction_base58, and optionally waitForSlotAdvance). A Squads proposal export in the same shape works too.

Step 2 — Build the fork-config

warp fork accepts a per-chain fork-config; the Sealevel slice takes the tx file by path (SvmRawForkConfigSchema's { path } form — the array is read from disk):

# $WORK/fork-config.yaml
<sealevelChain>:
  path: <WORK>/svm-txs.json

(Inline { transactions: [...] } is also accepted, but path avoids embedding base58 blobs.)

Step 3 — Fork, replay, and serve the overlaid registry

Serve the target (PR) registry so fork/check read the intended addresses, then run warp fork in the background (it forks the route's Sealevel chain with surfpool, replays the txs under skip-sigverify/skip-blockhash, and serves an overlaid registry whose Sealevel RPC points at the local fork):

cd $MONOREPO_ROOT && pnpm -C typescript/cli exec tsx cli.ts warp fork \
  --warpRouteId $WARP_ROUTE_ID --registry http://localhost:3333 \
  --fork-config $WORK/fork-config.yaml --port 8545

• Run it with run_in_background: true (the command serves HTTP and holds the fork).
• The overlaid registry is served on port - 10 (e.g. 8535 for --port 8545).
• Note the task/shell ID so you can stop it in Step 5.

Finalization note: surfpool's copy-on-read fetches the datasource at finalized commitment. Mainnet state is long-finalized, so this is a non-issue in practice. (Only matters when forking a freshly-written local validator.)

Step 4 — warp check against the desired config

cd $MONOREPO_ROOT && pnpm -C typescript/cli exec tsx cli.ts warp check \
  --warpRouteId $WARP_ROUTE_ID --registry http://localhost:8535

Point --registry at the served fork registry (port - 10) so warp check reads the fork's post-replay on-chain state. Expect zero violations — that means the replayed txs produce exactly the target config.

Step 5 — Cleanup (mandatory)

Stop the background warp fork process (KillShell with its ID). It terminates the local surfpool process (SIGTERM) — don't leave it running.

Step 6 — Report

• PASS/FAIL with the concrete config deltas (owner/ISM/router/gas/fee) vs the target config.
• Anything not covered.

Gotchas (learned)

• surfpool forks the datasource's current head; there is no fork-at-slot flag (unlike anvil's --fork-block-number). Config validation against current mainnet state is exactly what this loop does.
• Impersonation is global --skip-signature-verification (handled inside the SVM fork path) — you don't need the authority's key, and Squads vault PDAs sign via program CPI seeds so they need nothing special.
• The tx file is the exact warp apply --submitter file output; don't re-serialize or re-sign it.
• warp check works for Sealevel — it reads the fork's on-chain PDA state and diffs against the target config.

Related skills

• /warp-fork — fork a warp route's chains (per-protocol: anvil for EVM, surfpool for SVM).
• /warp-simulate-safe-txs — the EVM/Safe analog of this loop.
• /start-http-registry — serve a local/PR registry for fork+check.
• /warp-route-check — standalone warp check.