Zig

AXM reads Zig extension metadata from an agent-extensions.json sidecar at the package root. This is the two-way linking model applied to the Zig ecosystem.

Add an agent-extensions.json file at the package root with an agentExtensions array. Each entry is an extension reference (@owner/<type>/<name>):

// agent-extensions.json
{
  "$schema": "https://axm.sh/schemas/agent-extensions.schema.json",
  "agentExtensions": [{ "ref": "@examples/packs/zig-zon-tinyflags" }],
}

Zig packages are fetched as content-addressed archives, so include the sidecar by listing it in the .paths field of build.zig.zon:

// build.zig.zon
.paths = .{
    "build.zig",
    "build.zig.zon",
    "src",
    "agent-extensions.json",
},

Keep recommendations identity-only — omit versionRange. AXM resolves the reference to the newest matching extension version and pins it in the user's axm.lock. Prefer recommending a single pack so you keep one stable reference while its contents evolve.

Add a semver versionRange only when your package genuinely pairs with a bounded major line of the extension:

{
  "agentExtensions": [
    {
      "ref": "@examples/packs/zig-zon-tinyflags",
      "versionRange": "^1.0.0",
    },
  ],
}

On the extension manifest (skill.json, pack.json, subagent.json, …), add a packages array with a Zig purl. Use the package name from build.zig.zon as the purl name:

// pack.json
{
  "packages": [{ "purl": "pkg:zig/agentxm_example_tinyflags" }],
}

Default to identity-only. Add a VERS versionRange with the zig scheme only when the extension depends on package APIs introduced or removed in a known range:

{
  "packages": [
    {
      "purl": "pkg:zig/agentxm_example_tinyflags",
      "versionRange": "vers:zig/>=0.1.0|<1.0.0",
    },
  ],
}

When the Zig package recommends an extension through the AgentXM Registry and that extension names the package as a companion via its purl, AXM derives official status for the pair — no extra flag. See Official extensions.

The zig-zon-lib and zig-zon-app directories in polyglot-examples are the working fixtures for everything above. The package publishes a TinyFlags companion pack and recommends it from the agent-extensions.json sidecar (listed in .paths); the pack and each skill declare the package's pkg:zig purl as an identity-only companion package.