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claude/skills/extism/references/github/README.md
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# Repository README
<div align="center">
<a href="https://extism.org">
<picture>
<source media="(prefers-color-scheme: dark)" srcset=".github/assets/logo-horizontal-darkmode.png">
<img alt="Extism - the WebAssembly framework" width="75%" style="max-width: 600px" src=".github/assets/logo-horizontal.png">
</picture>
</a>
[![Discord](https://img.shields.io/discord/1011124058408112148?color=%23404eed&label=Community%20Chat&logo=Discord&logoColor=%23404eed)](https://extism.org/discord)
![GitHub Org's stars](https://img.shields.io/github/stars/extism)
![Downloads](https://img.shields.io/crates/d/extism-manifest)
![GitHub License](https://img.shields.io/github/license/extism/extism)
![GitHub release (with filter)](https://img.shields.io/github/v/release/extism/extism)
</div>
# Overview
Extism is a lightweight framework for building with WebAssembly (Wasm). It
supports running Wasm code on servers, the edge, CLIs, IoT, browsers and
everything in between. Extism is designed to be "universal" in that it supports
a common interface, no matter where it runs.
> **Note:** One of the primary use cases for Extism is **building extensible
> software & plugins**. You want to be able to execute arbitrary, untrusted code
> from your users? Extism makes this safe and practical to do.
Additionally, Extism adds some extra utilities on top of standard Wasm runtimes.
For example, we support persistent memory/module-scope variables, secure &
host-controlled HTTP without WASI, runtime limiters & timers, simpler host
function linking, and more. Extism users build:
- plug-in systems
- FaaS platforms
- code generators
- web applications
- & much more...
# Supported Targets
We currently provide releases for the following targets:
- aarch64-apple-darwin
- aarch64-unknown-linux-gnu
- aarch64-unknown-linux-musl
- x86_64-apple-darwin
- x86_64-pc-windows-gnu
- x86_64-pc-windows-msvc
- x86_64-unknown-linux-gnu
- x86_64-unknown-linux-musl
For Android we suggest taking a look at the [Chicory SDK](https://github.com/extism/chicory-sdk) for a pure Java
Extism runtime.
# Run WebAssembly In Your App
Pick a SDK to import into your program, and refer to the documentation to get
started:
| Type | Language | Source Code | Package |
| ----------- | ---------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- |
| Rust SDK | <img alt="Rust SDK" src="https://extism.org/img/sdk-languages/rust.svg" width="50px"/> | https://github.com/extism/extism/tree/main/runtime | [Crates.io](https://crates.io/crates/extism) |
| JS SDK | <img alt="JS SDK" src="https://extism.org/img/sdk-languages/js.svg" width="50px"/> | https://github.com/extism/js-sdk <br/>(supports Web, Node, Deno & Bun!) | [NPM](https://www.npmjs.com/package/@extism/extism) |
| Elixir SDK | <img alt="Elixir SDK" src="https://extism.org/img/sdk-languages/elixir.svg" width="50px"/> | https://github.com/extism/elixir-sdk | [Hex](https://hex.pm/packages/extism) |
| Go SDK | <img alt="Go SDK" src="https://extism.org/img/sdk-languages/go.svg" width="50px"/> | https://github.com/extism/go-sdk | [Go mod](https://pkg.go.dev/github.com/extism/go-sdk) |
| Haskell SDK | <img alt="Haskell SDK" src="https://extism.org/img/sdk-languages/haskell.svg" width="50px"/> | https://github.com/extism/haskell-sdk | [Hackage](https://hackage.haskell.org/package/extism) |
| Java SDK | <img alt="Java SDK" src="https://extism.org/img/sdk-languages/java-android.svg" width="50px"/> | https://github.com/extism/java-sdk | [Sonatype](https://central.sonatype.com/artifact/org.extism.sdk/extism) |
| .NET SDK | <img alt=".NET SDK" src="https://extism.org/img/sdk-languages/dotnet.svg" width="50px"/> | https://github.com/extism/dotnet-sdk <br/>(supports C# & F#!) | [Nuget](https://www.nuget.org/packages/Extism.Sdk) |
| OCaml SDK | <img alt="OCaml SDK" src="https://extism.org/img/sdk-languages/ocaml.svg" width="50px"/> | https://github.com/extism/ocaml-sdk | [opam](https://opam.ocaml.org/packages/extism/) |
| Perl SDK | <img alt="Perl SDK" src="https://extism.org/img/sdk-languages/perl.svg" width="50px"/> | https://github.com/extism/perl-sdk | [CPAN](https://metacpan.org/pod/Extism) |
| PHP SDK | <img alt="PHP SDK" src="https://extism.org/img/sdk-languages/php.svg" width="50px"/> | https://github.com/extism/php-sdk | [Packagist](https://packagist.org/packages/extism/extism) |
| Python SDK | <img alt="Python SDK" src="https://extism.org/img/sdk-languages/python.svg" width="50px"/> | https://github.com/extism/python-sdk | [PyPi](https://pypi.org/project/extism/) |
| Ruby SDK | <img alt="Ruby SDK" src="https://extism.org/img/sdk-languages/ruby.svg" width="50px"/> | https://github.com/extism/ruby-sdk | [RubyGems](https://rubygems.org/gems/extism) |
| Zig SDK | <img alt="Zig SDK" src="https://extism.org/img/sdk-languages/zig.svg" width="50px"/> | https://github.com/extism/zig-sdk | N/A |
| C SDK | <img alt="C SDK" src="https://extism.org/img/sdk-languages/c.svg" width="50px"/> | https://github.com/extism/extism/tree/main/libextism | N/A |
| C++ SDK | <img alt="C++ SDK" src="https://extism.org/img/sdk-languages/cpp.svg" width="50px"/> | https://github.com/extism/cpp-sdk | N/A |
# Compile WebAssembly to run in Extism Hosts
Extism Hosts (running the SDK) must execute WebAssembly code that has a
[PDK, or Plug-in Development Kit](https://extism.org/docs/concepts/pdk), library
compiled in to the `.wasm` binary. PDKs make it easy for plug-in / extension
code authors to read input from the host and return data back, read provided
configuration, set/get variables, make outbound HTTP calls if allowed, and more.
Pick a PDK to import into your Wasm program, and refer to the documentation to
get started:
| Type | Language | Source Code | Package |
| ------------------ | ---------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------- | --------------------------------------------------------- |
| Rust PDK | <img alt="Rust PDK" src="https://extism.org/img/sdk-languages/rust.svg" width="50px"/> | https://github.com/extism/rust-pdk | [Crates.io](https://crates.io/crates/extism-pdk) |
| JS PDK | <img alt="JS PDK" src="https://extism.org/img/sdk-languages/js.svg" width="50px"/> | https://github.com/extism/js-pdk | N/A |
| Python PDK | <img alt="Python PDK" src="https://extism.org/img/sdk-languages/python.svg" width="50px"/> | https://github.com/extism/python-pdk | N/A |
| Go PDK | <img alt="Go PDK" src="https://extism.org/img/sdk-languages/go.svg" width="50px"/> | https://github.com/extism/go-pdk | [Go mod](https://pkg.go.dev/github.com/extism/go-pdk) |
| Haskell PDK | <img alt="Haskell PDK" src="https://extism.org/img/sdk-languages/haskell.svg" width="50px"/> | https://github.com/extism/haskell-pdk | [Hackage](https://hackage.haskell.org/package/extism-pdk) |
| AssemblyScript PDK | <img alt="AssemblyScript PDK" src="https://extism.org/img/sdk-languages/assemblyscript.svg" width="50px"/> | https://github.com/extism/assemblyscript-pdk | [NPM](https://www.npmjs.com/package/@extism/as-pdk) |
| .NET PDK | <img alt=".NET PDK" src="https://extism.org/img/sdk-languages/dotnet.svg" width="50px"/> | https://github.com/extism/dotnet-pdk <br/>(supports C# & F#!) | [Nuget](https://www.nuget.org/packages/Extism.Pdk) |
| C PDK | <img alt="C PDK" src="https://extism.org/img/sdk-languages/c.svg" width="50px"/> | https://github.com/extism/c-pdk | N/A |
| C++ PDK | <img alt="C++ PDK" src="https://extism.org/img/sdk-languages/cpp.svg" width="50px"/> | https://github.com/extism/cpp-pdk | N/A |
| Zig PDK | <img alt="Zig PDK" src="https://extism.org/img/sdk-languages/zig.svg" width="50px"/> | https://github.com/extism/zig-pdk | N/A |
# Generating Bindings
It's often very useful to define a schema to describe the function signatures
and types you want to use between Extism SDK and PDK languages.
[XTP Bindgen](https://github.com/dylibso/xtp-bindgen) is an open source
framework to generate PDK bindings for Extism plug-ins. It's used by the
[XTP Platform](https://www.getxtp.com/), but can be used outside of the platform
to define any Extism compatible plug-in system.
## 1. Install the `xtp` CLI.
See installation instructions
[here](https://docs.xtp.dylibso.com/docs/cli#installation).
## 2. Create a schema using our OpenAPI-inspired IDL:
```yaml
version: v1-draft
exports:
CountVowels:
input:
type: string
contentType: text/plain; charset=utf-8
output:
$ref: "#/components/schemas/VowelReport"
contentType: application/json
# components.schemas defined in example-schema.yaml...
```
> See an example in [example-schema.yaml](./example-schema.yaml), or a full
> "kitchen sink" example on
> [the docs page](https://docs.xtp.dylibso.com/docs/concepts/xtp-schema/).
## 3. Generate bindings to use from your plugins:
```
xtp plugin init --schema-file ./example-schema.yaml
> 1. TypeScript
2. Go
3. Rust
4. Python
5. C#
6. Zig
7. C++
8. GitHub Template
9. Local Template
```
This will create an entire boilerplate plugin project for you to get started
with. Implement the empty function(s), and run `xtp plugin build` to compile
your plugin.
> For more information about XTP Bindgen, see the
> [dylibso/xtp-bindgen](https://github.com/dylibso/xtp-bindgen) repository and
> the official
> [XTP Schema documentation](https://docs.xtp.dylibso.com/docs/concepts/xtp-schema).
# Support
## Discord
If you experience any problems or have any questions, please join our
[Discord](https://extism.org/discord) and let us know. Our community is very
responsive and happy to help get you started.
## Usage
Head to the [project website](https://extism.org) for more information and docs.
Also, consider reading an [overview](https://extism.org/docs/overview) of Extism
and its goals & approach.
## Contribution
Thank you for considering a contribution to Extism, we are happy to help you
make a PR or find something to work on!
The easiest way to start would be to join the
[Discord](https://extism.org/discord) or open an issue on the
[`extism/proposals`](https://github.com/extism/proposals) issue tracker, which
can eventually become an Extism Improvement Proposal (EIP).
For more information, please read the
[Contributing](https://extism.org/docs/concepts/contributing) guide.
---
## Who's behind this?
Extism is an open-source product from the team at:
<p align="left">
<a href="https://dylibso.com" _target="blanks"><img width="200px" src="https://user-images.githubusercontent.com/7517515/198204119-5afdebb9-a5d8-4322-bd2a-46179c8d7b24.svg"/></a>
</p>
_Reach out and tell us what you're building! We'd love to help:_
<a href="mailto:hello@dylibso.com">hello@dylibso.com</a>
claude/skills/extism/references/github/issues.md
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# GitHub Issues
37 recent issues.
## #666: runtime: wasi preview2 (without Component Model)
**State**: open
**URL**: https://github.com/extism/extism/issues/666
## #879: wasmtime low severity security vulnerability RUSTSEC-2025-0046
**State**: open
**URL**: https://github.com/extism/extism/issues/879
## #470: Add Observe SDK support to the Extism runtime
**State**: open
**URL**: https://github.com/extism/extism/issues/470
## #637: feature: Give users a way to manage timeouts from inside host functions
**State**: open
**URL**: https://github.com/extism/extism/issues/637
## #672: Pass plug-in ID into `set_log_callback` callback function
**State**: open
**Labels**: enhancement
**URL**: https://github.com/extism/extism/issues/672
## #851: cache_config not working on Android aarch64
**State**: open
**URL**: https://github.com/extism/extism/issues/851
## #877: bindings for the Nim language?
**State**: open
**URL**: https://github.com/extism/extism/issues/877
## #725: Improve the libextism story on mac
**State**: open
**URL**: https://github.com/extism/extism/issues/725
## #872: Response headers and body are empty when HTTP response has an error status
**State**: closed
**URL**: https://github.com/extism/extism/issues/872
## #563: Implement Java PDK
**State**: open
**URL**: https://github.com/extism/extism/issues/563
## #868: request: List all functions
**State**: open
**URL**: https://github.com/extism/extism/issues/868
## #864: breaking request: Change the internal data structure for allowed paths
**State**: open
**URL**: https://github.com/extism/extism/issues/864
## #860: Cannot cancel uninterrupted sleep such as Python time.sleep
**State**: open
**URL**: https://github.com/extism/extism/issues/860
## #838: implement `ToBytes`/`FromBytes` for `bool`
**State**: closed
**URL**: https://github.com/extism/extism/issues/838
## #849: Is there anything to be done about slow initial load time?
**State**: closed
**URL**: https://github.com/extism/extism/issues/849
## #846: Wrong argument values being passed to Host functions.
**State**: closed
**URL**: https://github.com/extism/extism/issues/846
## #845: Disable unused dependency features
**State**: open
**URL**: https://github.com/extism/extism/issues/845
## #844: Suggestion when forgetting to derive encoding is not useful
**State**: closed
**URL**: https://github.com/extism/extism/issues/844
## #840: is it possible to use websocket in extism plugin?
**State**: closed
**URL**: https://github.com/extism/extism/issues/840
## #833: java pdk
**State**: closed
**URL**: https://github.com/extism/extism/issues/833
claude/skills/extism/references/github/releases.md
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# Releases
## latest: Development Build
**Published**: 2025-10-09
## Commits
- de81040: Update to wasmtime version with exceptions support (#880) (Brian G. Merrell) [#880](https://github.com/extism/extism/pull/880)
## v1.12.0: v1.12.0
**Published**: 2025-07-14
## What's Changed
* feat: add Pool type for pooling plugin instances by @zshipko in https://github.com/extism/extism/pull/696
* docs: add more information about wasmtime caching by @nu-wa in https://github.com/extism/extism/pull/863
* Remove key param for PluginPool by @Nutomic in https://github.com/extism/extism/pull/859
* chore(deps): Update prost requirement from 0.13.1 to 0.14.1 by @dependabot[bot] in https://github.com/extism/extism/pull/865
* Update README.md by @Binlogo in https://gi
## v1.11.1: v1.11.1
**Published**: 2025-05-29
## What's Changed
* fix: use gh release download instead of downloading from github action artifacts in dotnet workflow by @mhmd-azeez in https://github.com/extism/extism/pull/857
**Full Changelog**: https://github.com/extism/extism/compare/v1.11.0...v1.11.1
## v1.11.0: v1.11.0
**Published**: 2025-05-27
## What's Changed
* chore: include wasmtime 30 in supported bounds by @zshipko in https://github.com/extism/extism/pull/834
* Remove python from dependabot.yml by @zshipko in https://github.com/extism/extism/pull/835
* fix: throw error on reentrant plugin call by @chrisdickinson in https://github.com/extism/extism/pull/836
* doc: explain how to see plug-in logs by @Pascal-So in https://github.com/extism/extism/pull/839
* fix: better suggestion when encoding is not implemented by @Alessandro
## v1.10.0: v1.10.0
**Published**: 2025-02-10
## What's Changed
* Change `function_exists` to `&self` by @milesj in https://github.com/extism/extism/pull/796
* chore: fix clippy by @zshipko in https://github.com/extism/extism/pull/799
* Trigger NuGet package publishing when a new release is published by @mhmd-azeez in https://github.com/extism/extism/pull/805
* fix: improve sdk error messages around imports by @zshipko in https://github.com/extism/extism/pull/806
* feat: added a function to track fuel consumption by @pwnintended in htt
## v1.9.1: v1.9.1
**Published**: 2024-11-26
## What's Changed
* feat: add overview on generating bindings by @nilslice in https://github.com/extism/extism/pull/789
* chore(deps): Bump dawidd6/action-download-artifact from 2 to 6 in /.github/workflows by @dependabot in https://github.com/extism/extism/pull/792
* cleanup: return better errors for wasi command modules by @zshipko in https://github.com/extism/extism/pull/793
* fix: remove unwrap() from extism_compiled_plugin_new by @chrisdickinson in https://github.com/extism/extism/pull/
## v1.9.0: v1.9.0
**Published**: 2024-11-19
## What's Changed
* chore: update to wasmtime 26 by @zshipko in https://github.com/extism/extism/pull/783
* feat: add CompiledPlugin by @zshipko in https://github.com/extism/extism/pull/784
* docs: add comment to fs example by @zshipko in https://github.com/extism/extism/pull/788
**Full Changelog**: https://github.com/extism/extism/compare/v1.8.0...v1.9.0
## v1.8.0: v1.8.0
**Published**: 2024-10-22
## What's Changed
* Fix: no method named `free` found for mutable reference `&mut current_plugin::CurrentPlugin` in the current scope by @billythedummy in https://github.com/extism/extism/pull/773
* fix(plugin_call): set rc to EXIT_SIGNALED_SIGABRT when wasmtime bails out on plugin call by @G4Vi in https://github.com/extism/extism/pull/776
* feat: add ability to access response headers when using `extism:host/env::http_request` by @zshipko in https://github.com/extism/extism/pull/774
* fix:
## v1.7.0: v1.7.0
**Published**: 2024-09-24
## What's Changed
* chore: define pdk term in README by @Utopiah in https://github.com/extism/extism/pull/766
* feat: add `PluginBuilder::with_wasmtime_config` by @zshipko in https://github.com/extism/extism/pull/764
* cleanup(kernel): only try to re-use free blocks before memory.grow by @zshipko in https://github.com/extism/extism/pull/765
* Adds more details about with_wasmtime_config() limitations by @SebastianHambura in https://github.com/extism/extism/pull/770
* cleanup: host takes own
## v1.6.0: v1.6.0
**Published**: 2024-09-04
## What's Changed
* Add readonly dirs to allowed_paths by @mhmd-azeez in https://github.com/extism/extism/pull/733
* feat(runtime): support log_trace in rust-sdk by @hilaryRope in https://github.com/extism/extism/pull/747
* cleanup: allow shadowing host functions by @zshipko in https://github.com/extism/extism/pull/751
* feat: add releasing x86_64-unknown-linux-musl dynamic library by @G4Vi in https://github.com/extism/extism/pull/753
* chore(deps): Update cbindgen requirement from 0.26 to