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Edit Cargo features: ORT-free targets, aggregates, PDF backends and parity.

.ai-rulez/skills/feature-flag-conventions/SKILL.md

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# Feature-flag conventions

Shared concerns use the **same flag name with the same semantics** in every library. A consumer that learns `otel` or `mcp` once should get identical behavior across every library and its bindings. Repo-specific flags stay local — this contract governs only shared concerns.

## Standard flags

| Flag | Meaning | Default | Notes |
|------|---------|---------|-------|
| *(none)* `tracing` | Structured tracing is **always-on**, never a feature. | — | `tracing` is a non-optional dependency. Do not gate span emission. Un-gate any legacy optional `tracing` feature. |
| `otel` | Opt-in OpenTelemetry / OTLP export layer, on top of always-on tracing. | off | Pulls `tracing-opentelemetry` + the `opentelemetry*` stack. This is the only observability feature. Reconcile any always-on OTLP deps behind it. |
| `mcp` | Embedded Model Context Protocol server (stdio transport). | off | |
| `mcp-http` | MCP Streamable HTTP transport; implies `mcp`. | off | `mcp-http = ["mcp", ...]`. |
| `mimalloc` | Select the mimalloc global allocator. | off | Mutually exclusive with `jemalloc`; see the allocator rule below. |
| `jemalloc` | Select the jemalloc global allocator. | off | Mutually exclusive with `mimalloc`. |
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