SkillsAdd

danmossa/spacetimedb-skills

spacetimedb-serialization

Use when working with SpacetimeDB low-level formats and ABI details: BSATN, SATS JSON, AlgebraicValue, AlgebraicType, WebAssembly module ABI, host calls, buffers, reducer scheduling, table mutation, querying, or `bindings.h`.

First seen May 7, 2026

Installation

$ npx skills add danmossa/spacetimedb-skills --skill spacetimedb-serialization
View on skills.sh ↗ GitHub repository ↗

Summary

  • Use when working with SpacetimeDB low-level formats and ABI details: BSATN, SATS JSON, AlgebraicValue, AlgebraicType, WebAssembly module ABI, host calls, buffers, reducer scheduling, table mutation, querying, or `bindings.h`.
  • Triggers on: BSATN, SATS, AlgebraicValue, AlgebraicType, wasm ABI, module ABI, host calls.

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More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 19
License MIT
Default branch main
Open issues 0
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

LicenseMIT

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 2,384 B
  • docs SUMMARY.md 349 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 45 installs

SKILL.md

Use this skill for low-level encoding, wire formats, and module ABI work.

Core encoding facts

  • Prefer generated SDKs and module APIs unless the task is explicitly custom tooling, protocol inspection, ABI work, or serialization debugging.
  • BSATN encodes product values as field values in order; field names are not encoded.
  • BSATN encodes strings as u32 byte length followed by UTF-8 bytes.
  • BSATN encodes integer and float primitive payloads in little-endian form; floats use their raw IEEE bit representation.
  • SATS JSON product values can be arrays by field order or objects by field name.
  • SATS JSON encodes integer types as JSON numbers, so large 64-bit, 128-bit, and 256-bit values can lose precision in normal JavaScript number handling.
  • Sum values are tagged unions; the tag is the variant index or name depending on the format.

ABI cautions

  • WebAssembly ABI functions use the C ABI on wasm32 and often communicate through pointer/length pairs.
  • Most host functions return u16, with 0 meaning success; outputs are written through out pointers.
  • Some UTF-8 handling is lossy; invalid bytes may be replaced.
  • Buffer functions have explicit ownership rules. Do not reuse consumed host buffers.

Reference map

Need Open
BSATN [references/bsatn.md](references/bsatn.md)
SATS JSON [references/sats-json.md](references/sats-json.md)
WebAssembly module ABI [references/webassembly-abi.md](references/webassembly-abi.md)

Guidance

  • Prefer high-level SDK and module APIs unless the user's task is explicitly about serialization, ABI, or custom tooling.
  • Keep byte-level examples tied to the reference notation.
  • Route normal client/server code back to the relevant SDK, reducer, table, or procedure skill.