stdlib-coverage

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Aktualisiert27. Juni 2026 um 08:11

Understand how much of the Swift standard library the runtime implements, by section and by member. Use when the user asks about stdlib coverage, what's implemented/missing/verified, which APIs to build next, or when planning stdlib work.

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siuying

siuying/tswift

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SKILL.md

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name	stdlib-coverage
description	Understand how much of the Swift standard library the runtime implements, by section and by member. Use when the user asks about stdlib coverage, what's implemented/missing/verified, which APIs to build next, or when planning stdlib work.

Stdlib coverage

Measures the runtime's Swift stdlib implementation against the full reference surface (docs/swift-runtime/stdlib-inventory.md). Each member is classified:

missing — not in the tswift-std registry.
implemented — in the registry (declared coverage).
verified — in the registry and exercised by a passing CLI golden fixture.

Workflow — top-down, two steps

Always go overall → section. Don't read the inventory by hand.

Refresh the registry snapshot (cannot drift — reads the live registry):
```
cargo test -p tswift-std dump_registered_keys
```
Check overall coverage first — list every targeted section with impl/verified/total counts and the overall roll-up:
```
python3 tools/stdlib-inventory/coverage.py
```
Use this to spot the lowest-coverage sections. Add --all to include sections with no coverage yet.
Then drill into one section — member-by-member, grouped into verified / implemented / missing:
```
python3 tools/stdlib-inventory/coverage.py Array
python3 tools/stdlib-inventory/coverage.py "free functions"
```
The missing group is the concrete to-do list for that section.

Notes

Section names match inventory headings, case-insensitive; an unknown name prints close matches.
After registering a new stdlib intrinsic, re-run step 1 so the report is current.
Tooling details: tools/stdlib-inventory/README.md. Plan context: docs/plan/stdlib-support.md §2/§4.2.

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name	stdlib-coverage
description	Understand how much of the Swift standard library the runtime implements, by section and by member. Use when the user asks about stdlib coverage, what's implemented/missing/verified, which APIs to build next, or when planning stdlib work.

Stdlib coverage

Measures the runtime's Swift stdlib implementation against the full reference surface (docs/swift-runtime/stdlib-inventory.md). Each member is classified:

missing — not in the tswift-std registry.
implemented — in the registry (declared coverage).
verified — in the registry and exercised by a passing CLI golden fixture.

Workflow — top-down, two steps

Always go overall → section. Don't read the inventory by hand.

Refresh the registry snapshot (cannot drift — reads the live registry):
```
cargo test -p tswift-std dump_registered_keys
```
Check overall coverage first — list every targeted section with impl/verified/total counts and the overall roll-up:
```
python3 tools/stdlib-inventory/coverage.py
```
Use this to spot the lowest-coverage sections. Add --all to include sections with no coverage yet.
Then drill into one section — member-by-member, grouped into verified / implemented / missing:
```
python3 tools/stdlib-inventory/coverage.py Array
python3 tools/stdlib-inventory/coverage.py "free functions"
```
The missing group is the concrete to-do list for that section.

Notes

Section names match inventory headings, case-insensitive; an unknown name prints close matches.
After registering a new stdlib intrinsic, re-run step 1 so the report is current.
Tooling details: tools/stdlib-inventory/README.md. Plan context: docs/plan/stdlib-support.md §2/§4.2.