The landed mock Anthropic harness now covers multi-tool turns, bash flows,
permission prompt approve/deny paths, and an external plugin tool path.
A machine-readable scenario manifest plus a diff/checklist runner keep the
new scenarios tied back to PARITY.md so future additions stay honest.
Constraint: Must build on the deterministic mock service and clean-environment CLI harness
Rejected: Add an MCP tool scenario now | current MCP tool surface is still stubbed, so plugin coverage is the real executable path
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep rust/mock_parity_scenarios.json, mock_parity_harness.rs, and PARITY.md refs in lockstep
Tested: cargo fmt --all
Tested: cargo clippy --workspace --all-targets -- -D warnings
Tested: cargo test --workspace
Tested: python3 rust/scripts/run_mock_parity_diff.py
Not-tested: Real MCP lifecycle handshakes; remote plugin marketplace install flows
This adds a deterministic mock Anthropic-compatible /v1/messages service,
a clean-environment CLI harness, and repo docs so the first parity
milestone can be validated without live network dependencies.
Constraint: First milestone must prove Rust claw can connect from a clean environment and cover streaming, tool assembly, and permission/tool flow
Constraint: No new third-party dependencies; reuse the existing Rust workspace stack
Rejected: Record/replay live Anthropic traffic | nondeterministic and unsuitable for repeatable CI coverage
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep scenario markers and expected tool payload shapes synchronized between the mock service and the harness tests
Tested: cargo fmt --all
Tested: cargo clippy --workspace --all-targets -- -D warnings
Tested: cargo test --workspace
Tested: ./scripts/run_mock_parity_harness.sh
Not-tested: Live Anthropic responses beyond the five scripted harness scenarios
PARITY.md and the current Rust CLI UX both pointed at session-management polish as a worthwhile parity lane. The existing /clear flow reset the live REPL without telling the user how to get back, and the resumed /clear path overwrote the saved session file in place with no recovery handle.
This change keeps the existing clear semantics but makes them safer and more legible. Live clears now print the previous session id and a resume hint, while resumed clears write a sibling backup before resetting the requested session file and report both the backup path and the new session id.
Constraint: Keep /clear compatible with follow-on commands in the same --resume invocation
Rejected: Switch resumed /clear to a brand-new primary session path | would break the expected in-place reset semantics for chained resume commands
Confidence: high
Scope-risk: narrow
Directive: Preserve explicit recovery hints in /clear output if session lifecycle behavior changes again
Tested: cargo test --manifest-path rust/Cargo.toml -p rusty-claude-cli --test resume_slash_commands
Tested: cargo test --manifest-path rust/Cargo.toml -p rusty-claude-cli --bin claw clear_command_requires_explicit_confirmation_flag
Not-tested: Manual interactive REPL /clear run
The release harness advertised resumed slash commands like /export <file> and /clear --confirm, but argv parsing split every slash-prefixed token into a new command. That made the claw binary reject legitimate resumed command sequences and quietly miss the caller-provided export target.
This change teaches --resume parsing to keep command arguments attached, including absolute export paths, and locks the behavior with both parser regressions and a binary-level smoke test that exercises the real claw resume path.
Constraint: Keep the scope to a high-confidence release-path fix that fits a ~1 hour hardening pass
Rejected: Broad REPL or network end-to-end coverage expansion | too slow and too wide for the release-confidence target
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: If new resume-supported commands accept slash-prefixed literals, extend the resume parser heuristics and add binary coverage for them
Tested: cargo test --workspace; cargo test -p rusty-claude-cli --test resume_slash_commands; cargo test -p rusty-claude-cli parses_resume_flag_with_absolute_export_path -- --exact
Not-tested: cargo clippy --workspace --all-targets -- -D warnings currently fails on pre-existing runtime/conversation/session lints outside this change
