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Add runtime MCP helpers for name normalization, tool naming, CCR proxy URL unwrapping, config signatures, and stable scope-independent config hashing. This is the fastest clean parity-unblocking MCP slice because it creates real reusable behavior needed by future client/transport work without forcing a transport boundary prematurely. The helpers mirror key upstream semantics around normalized tool names and dedup/config-change detection. Constraint: Must land a real MCP foundation without pulling transport management into the same commit Constraint: Runtime verification must pass with fmt, clippy, and tests Rejected: Start with transport/client scaffolding first | would need more design surface and more unverified edges Rejected: Leave normalization/signature logic implicit in later client code | would duplicate behavior and complicate testing Confidence: high Scope-risk: narrow Reversibility: clean Directive: Reuse these helpers for future MCP tool naming, dedup, and reconnect/change-detection work instead of re-encoding the rules ad hoc Tested: cargo fmt --all; cargo clippy -p runtime --all-targets -- -D warnings; cargo test -p runtime Not-tested: live MCP transport connections; plugin reload integration; full connector dedup flows
Rust port foundation
This directory contains the first compatibility-first Rust foundation for a drop-in Claude Code CLI replacement.
Current milestone
This initial milestone focuses on harness-first scaffolding, not full feature parity:
- a Cargo workspace aligned to major upstream seams
- a placeholder CLI crate (
rusty-claude-cli) - runtime, command, and tool registry skeleton crates
- a
compat-harnesscrate that reads the upstream TypeScript sources in../src/ - tests that prove upstream manifests/bootstrap hints can be extracted from the leaked TypeScript codebase
Workspace layout
rust/
├── Cargo.toml
├── README.md
├── crates/
│ ├── rusty-claude-cli/
│ ├── runtime/
│ ├── commands/
│ ├── tools/
│ └── compat-harness/
└── tests/
How to use
From this directory:
cargo fmt --all
cargo check --workspace
cargo test --workspace
cargo run -p rusty-claude-cli -- --help
cargo run -p rusty-claude-cli -- dump-manifests
cargo run -p rusty-claude-cli -- bootstrap-plan
Design notes
The shape follows the PRD's harness-first recommendation:
- Extract observable upstream command/tool/bootstrap facts first.
- Keep Rust module boundaries recognizable.
- Grow runtime compatibility behind proof artifacts.
- Document explicit gaps instead of implying drop-in parity too early.
Relationship to the root README
The repository root README explains the leaked TypeScript codebase. This document tracks the Rust replacement effort that lives in rust/.