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Mental model for the binary format, what survives compilation (and what's lost),\n  and how to read disassembly soundly. Trigger on \"what does this package do?\", \"read this\n  .mv module\", \"interpret this disassembly\", or whenever an analysis needs to interpret\n  bytecode faithfully.\n---\n\n# Move Bytecode Comprehension\n\n> **Self-bootstrap:** before relying on the routing below, load every reference file —\n> default to `sui prompt skill move-bytecode-comprehension --all`, or `--list` + `--file\n> \u003Cref>` when budget is tight. This SKILL.md is the mental-model wrapper; reference files\n> cover the binary format and the practice of reading disassembly.\n\nOn-chain Sui packages are compiled **Move bytecode** (`.mv`, magic `0xA11CEB0B`). For\nanalysis you read it as **disassembly** (stack-machine, via `sui move disassemble`). This\nskill is the mental model for the binary format and for reading disassembly soundly.\n\nThe single most important fact when reading Move bytecode: **abilities, visibility, the\n`entry` flag, signatures (incl. generics\u002Fphantom), and all on-chain identifiers —\nmodule\u002Fstruct\u002Ffield\u002Ffunction names — are preserved.** What is *lost* is human intent\nmetadata: constant\u002Ferror names, `#[error]` messages, local variable names, comments, and\nmacro structure. Tune reasoning accordingly.\n\n## What survives compilation — the survival table\n\n| Source construct | In bytecode? | How it appears in disassembly | Implication |\n|---|---|---|---|\n| Module address + name | ✓ | `module \u003Caddr>.\u003Cname>` | Identity is exact |\n| Struct names | ✓ | `struct Name ...` | Type-name reasoning is reliable |\n| Field names + types | ✓ | listed on the struct | Field-level reasoning holds |\n| **Abilities** (key\u002Fstore\u002Fcopy\u002Fdrop) | ✓ | `has store, key` | **Capability \u002F soulbound \u002F hot-potato reasoning is reliable** |\n| **Visibility** (private\u002Fpublic\u002Ffriend) | ✓ | keyword on fn | **Call-surface reasoning is reliable** |\n| **`entry` flag** | ✓ | `entry` keyword | **Tx-entry reasoning is reliable** |\n| Function signatures | ✓ | full `(Arg0: T, ...): Ret` | Param\u002Freturn reasoning holds |\n| Generics + phantom type params | ✓ | `\u003CT>` \u002F phantom | Type-identity reasoning holds |\n| Constant **values** | ✓ | `LdConst[i](T: ...)` | Values readable, names are not |\n| Constant \u002F error **names** | ✗ | `LdConst[i]` index only | **Use abort *codes*\u002Fpositions, not names** |\n| `#[error]` messages | ✗ | — | Error intent lost; reason from the abort site |\n| Local variable names | ✗ | `loc0`, `Arg1`, … | Don't trust names; trust dataflow |\n| Comments \u002F doc | ✗ | — | No author intent text |\n| Macros (`assert!`, `1u8.do!`) | expanded | inlined opcodes \u002F branches | A macro looks like its expansion |\n| Empty struct (e.g. OTW) | ✓ (as 1 field) | `dummy_field: bool` | **OTW detect via name+`drop`+synthetic field** |\n\n## How to read\n\n| File | Use for |\n|------|---------|\n| `format.md` | The binary format: tables, abilities, visibility, signatures, opcode categories. 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Abilities, visibility, the ",{"type":43,"tag":67,"props":783,"children":785},{"className":784},[],[786],{"type":48,"value":149},{"type":48,"value":788}," flag,\nsignatures, struct\u002Ffield shapes, control flow, and call patterns are all faithful.",{"type":43,"tag":756,"props":790,"children":791},{},[792,797,799,805],{"type":43,"tag":59,"props":793,"children":794},{},[795],{"type":48,"value":796},"Citation.",{"type":48,"value":798}," Findings cite ",{"type":43,"tag":67,"props":800,"children":802},{"className":801},[],[803],{"type":48,"value":804},"\u003Cmodule>.asm:B\u003Cblock>@i\u003Cindex>",{"type":48,"value":806}," — the basic-block label\nplus instruction index within the block.",{"type":43,"tag":756,"props":808,"children":809},{},[810,812,818],{"type":48,"value":811},"Bytecode version is shown as ",{"type":43,"tag":67,"props":813,"children":815},{"className":814},[],[816],{"type":48,"value":817},"\u002F\u002F Move bytecode vN",{"type":48,"value":819},"; note it — opcode availability\nvaries by version.",{"items":821,"total":865},[822,828,839,849],{"slug":4,"name":4,"fn":5,"description":6,"org":823,"tags":824,"stars":22,"repoUrl":23,"updatedAt":24},{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[825,826,827],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":14,"slug":8,"type":15},{"slug":829,"name":829,"fn":830,"description":831,"org":832,"tags":833,"stars":22,"repoUrl":23,"updatedAt":838},"official-sui-skills","access official Sui development resources","Pointer to the official Mysten Labs skills for building on Sui — language fundamentals, object model, PTBs, SDKs, publishing, upgrades, frontend integration, accessing on-chain data. Maintained upstream at github.com\u002FMystenLabs\u002Fskills; pinned to the same ref the audit catalog derives from (see maintenance\u002FUPSTREAMS.md). Trigger on \"build a contract\", \"publish a package\", \"upgrade a module or package\", \"use the TypeScript SDK\", \"write a PTB\", \"set up a Sui client\".\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[834,837],{"name":835,"slug":836,"type":15},"Documentation","documentation",{"name":14,"slug":8,"type":15},"2026-07-16T06:00:59.641382",{"slug":840,"name":840,"fn":841,"description":842,"org":843,"tags":844,"stars":22,"repoUrl":23,"updatedAt":848},"sui-and-move-tools","disassemble Sui Move bytecode","Use to get bytecode for a deployed Sui package and produce a disassembled working view. One GraphQL call fetches every module's raw bytecode bytes; `sui move disassemble` (already on the system, running `sui prompt`) produces `.asm` files for analysis. Trigger on \"fetch this package's bytecode\", \"get me the .mv for package X\", \"disassemble this package\", or \"I need to read a deployed Sui package\".\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[845,846,847],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":14,"slug":8,"type":15},"2026-07-16T06:02:25.3633",{"slug":850,"name":850,"fn":851,"description":852,"org":853,"tags":854,"stars":22,"repoUrl":23,"updatedAt":864},"sui-move-security-review","audit Sui Move smart contracts","Use when auditing, reviewing, or hunting for vulnerabilities in Move code on Sui. Applies equally to source code (.move files) and to disassembly of compiled bytecode (on-chain packages). A checklist of invariants whose VIOLATION causes exploitable bugs: access control & capabilities, struct abilities & type safety, object lifecycle & ownership, shared-object and PTB attack surface, dynamic fields & collections, arithmetic & coins, init\u002FOTW\u002Fpackage upgrades, hot-potato composability, time & on-chain randomness, and test-only code leakage. Trigger on \"audit this Move code\", \"find vulnerabilities in this Sui contract\", \"security review\", \"is this package safe?\", \"I suspect there's a bug in X\", \"something is wrong with this contract\", or when reasoning about whether a Move function can be abused.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[855,858,861,863],{"name":856,"slug":857,"type":15},"Code Review","code-review",{"name":859,"slug":860,"type":15},"Security","security",{"name":862,"slug":31,"type":15},"Smart Contracts",{"name":14,"slug":8,"type":15},"2026-07-16T06:02:55.691149",4,{"items":867,"total":1012},[868,874,879,885,892,910,926,939,960,972,983,999],{"slug":4,"name":4,"fn":5,"description":6,"org":869,"tags":870,"stars":22,"repoUrl":23,"updatedAt":24},{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[871,872,873],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":14,"slug":8,"type":15},{"slug":829,"name":829,"fn":830,"description":831,"org":875,"tags":876,"stars":22,"repoUrl":23,"updatedAt":838},{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[877,878],{"name":835,"slug":836,"type":15},{"name":14,"slug":8,"type":15},{"slug":840,"name":840,"fn":841,"description":842,"org":880,"tags":881,"stars":22,"repoUrl":23,"updatedAt":848},{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[882,883,884],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":14,"slug":8,"type":15},{"slug":850,"name":850,"fn":851,"description":852,"org":886,"tags":887,"stars":22,"repoUrl":23,"updatedAt":864},{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[888,889,890,891],{"name":856,"slug":857,"type":15},{"name":859,"slug":860,"type":15},{"name":862,"slug":31,"type":15},{"name":14,"slug":8,"type":15},{"slug":893,"name":893,"fn":894,"description":895,"org":896,"tags":897,"stars":907,"repoUrl":908,"updatedAt":909},"memwal","integrate Walrus Memory SDK","Walrus Memory SDK — portable agent memory that works across apps, sessions, and workflows.\n\nUse when users say:\n- \"add memory to my app\"\n- \"portable agent memory\"\n- \"integrate Walrus Memory\"\n- \"AI agent memory\"\n- \"memory across agents\"\n- \"Walrus memory storage\"\n- \"setup Walrus Memory\"\n- \"recall memories\"\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[898,901,904],{"name":899,"slug":900,"type":15},"Agents","agents",{"name":902,"slug":903,"type":15},"Memory","memory",{"name":905,"slug":906,"type":15},"SDK","sdk",57,"https:\u002F\u002Fgithub.com\u002FMystenLabs\u002FMemWal","2026-07-16T06:02:39.838395",{"slug":911,"name":911,"fn":912,"description":913,"org":914,"tags":915,"stars":923,"repoUrl":924,"updatedAt":925},"accessing-data","read data from the Sui network","How to read data from the Sui network. Use when choosing or implementing a data access strategy — queries for on-chain state, indexing pipelines, historical lookups, event subscriptions, cross-chain reads, or off-chain blob storage. Covers the two live Sui APIs (gRPC and GraphQL RPC), the Archival Store, the General-Purpose Indexer, the `sui-indexer-alt` custom indexing framework, and Walrus for off-chain blobs.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[916,919,920],{"name":917,"slug":918,"type":15},"Data Analysis","data-analysis",{"name":14,"slug":8,"type":15},{"name":921,"slug":922,"type":15},"Web3","web3",9,"https:\u002F\u002Fgithub.com\u002FMystenLabs\u002Fskills","2026-08-01T05:44:32.775598",{"slug":927,"name":927,"fn":928,"description":929,"org":930,"tags":931,"stars":923,"repoUrl":924,"updatedAt":938},"composable-move-functions","design composable Sui Move functions","Use when writing Move functions on Sui, especially public APIs. Applies to function visibility (public vs entry), parameter ordering, and return patterns. Use whenever designing function signatures or deciding whether functions should transfer objects or return them.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[932,935,936,937],{"name":933,"slug":934,"type":15},"API Development","api-development",{"name":862,"slug":31,"type":15},{"name":14,"slug":8,"type":15},{"name":921,"slug":922,"type":15},"2026-07-16T06:02:49.198495",{"slug":940,"name":940,"fn":941,"description":942,"org":943,"tags":944,"stars":923,"repoUrl":924,"updatedAt":959},"frontend-apps","build Sui dApps with dapp-kit","Sui frontend \u002F dApp development with @mysten\u002Fdapp-kit-react (React) and @mysten\u002Fdapp-kit-core (Vue, vanilla JS, Svelte, Web Components, other frameworks). Use when building browser apps that connect Sui wallets, query on-chain state, or submit transactions. Covers wallet connection, network switching, transaction execution, query patterns with TanStack React Query, and the specific pitfalls of browser + wallet + async-indexer environments. Pair with the `sui-sdks` skill for @mysten\u002Fsui Transaction construction patterns and the `ptbs` skill for PTB semantics.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[945,948,951,952,955,958],{"name":946,"slug":947,"type":15},"Frontend","frontend",{"name":949,"slug":950,"type":15},"React","react",{"name":14,"slug":8,"type":15},{"name":953,"slug":954,"type":15},"Svelte","svelte",{"name":956,"slug":957,"type":15},"Vue","vue",{"name":921,"slug":922,"type":15},"2026-08-01T05:44:28.958473",{"slug":961,"name":961,"fn":962,"description":963,"org":964,"tags":965,"stars":923,"repoUrl":924,"updatedAt":971},"generate-sui-agent-config","generate configuration files for Sui projects","Generate a CLAUDE.md or AGENT.md configuration file for Sui projects. Use when setting up a new Sui project, when user mentions \"CLAUDE.md\", \"AGENT.md\", \"agent config\", or when working on a Sui project that does not already have a CLAUDE.md or AGENT.md in the project root.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[966,969,970],{"name":967,"slug":968,"type":15},"Configuration","configuration",{"name":835,"slug":836,"type":15},{"name":14,"slug":8,"type":15},"2026-07-16T06:00:59.981056",{"slug":973,"name":973,"fn":974,"description":975,"org":976,"tags":977,"stars":923,"repoUrl":924,"updatedAt":982},"modern-move-syntax","write Move 2024 edition code for Sui","Use when writing Move code on Sui to ensure 2024 edition syntax is used. Applies to method calls, string literals, vector operations, option handling, loops, and struct unpacking. Use whenever writing Move code to avoid legacy function-call syntax patterns.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[978,979,980,981],{"name":17,"slug":18,"type":15},{"name":862,"slug":31,"type":15},{"name":14,"slug":8,"type":15},{"name":921,"slug":922,"type":15},"2026-07-16T06:02:43.277596",{"slug":984,"name":984,"fn":985,"description":986,"org":987,"tags":988,"stars":923,"repoUrl":924,"updatedAt":998},"move-unit-testing","write unit tests for Sui Move contracts","Use when writing unit tests for Move smart contracts on Sui. Applies to test function naming, assertions, test attributes, context usage, and cleanup patterns. Use whenever user asks to write tests, add tests, or test a Move module.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[989,992,993,994,997],{"name":990,"slug":991,"type":15},"QA","qa",{"name":862,"slug":31,"type":15},{"name":14,"slug":8,"type":15},{"name":995,"slug":996,"type":15},"Testing","testing",{"name":921,"slug":922,"type":15},"2026-08-01T05:44:30.788585",{"slug":1000,"name":1000,"fn":1001,"description":1002,"org":1003,"tags":1004,"stars":923,"repoUrl":924,"updatedAt":1011},"naming-conventions","apply Sui Move naming conventions","Use when writing or reviewing Move smart contracts on Sui. Applies to naming structs, error constants, regular constants, events, getter functions, capability types, hot potato types, and dynamic field keys. Use whenever creating new types, functions, or constants in Move code.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":11},[1005,1008,1009,1010],{"name":1006,"slug":1007,"type":15},"Best Practices","best-practices",{"name":862,"slug":31,"type":15},{"name":14,"slug":8,"type":15},{"name":921,"slug":922,"type":15},"2026-07-16T06:02:48.830052",37]