Reject unsupported YAML tags in check-yaml

[j178]

Closes #2604

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-30T12:03:22.080927Z	f212382	PR opened

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.06%. Comparing base (0c00148) to head (e518373).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2656   +/-   ##
=======================================
  Coverage   94.06%   94.06%           
=======================================
  Files         141      141           
  Lines       29816    29831   +15     
=======================================
+ Hits        28046    28061   +15     
  Misses       1770     1770           

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[prek-ci-bot]

📦 Cargo Bloat Comparison

.text size change: +0.00% (12.6 MiB → 12.6 MiB)

Expand for cargo-bloat output

Head Branch Results

File  .text     Size             Crate Name
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_encrypt_avx512
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_decrypt_avx512
0.0%   0.7%  96.5KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
0.0%   0.4%  52.0KiB              prek prek::run::{closure#0}
0.0%   0.4%  50.1KiB              prek <<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<&mut <serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.4%  48.7KiB annotate_snippets annotate_snippets::renderer::render::render
0.0%   0.3%  43.9KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<&mut <serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.3%  40.2KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  37.6KiB              prek prek::cli::run::run::run::{closure#0}
0.0%   0.2%  31.1KiB              prek <prek::languages::rust::rust::Rust as prek::languages::LanguageBackend>::install::{closure#0}
0.0%   0.2%  28.7KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.6KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  28.2KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble_alt
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.3KiB              toml <toml::de::deserializer::value::ValueDeserializer as serde_core::de::Deserializer>::deserialize_any::<<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor>
0.0%   0.2%  27.1KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  26.9KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
4.2%  86.8%  11.0MiB                   And 20401 smaller methods. Use -n N to show more.
4.9% 100.0%  12.6MiB                   .text section size, the file size is 258.7MiB

Base Branch Results

File  .text     Size             Crate Name
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_encrypt_avx512
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_decrypt_avx512
0.0%   0.7%  96.2KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
0.0%   0.4%  50.6KiB              prek <<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.4%  48.7KiB annotate_snippets annotate_snippets::renderer::render::render
0.0%   0.4%  47.0KiB              prek prek::run::{closure#0}
0.0%   0.3%  44.1KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.3%  40.2KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  38.7KiB              prek prek::cli::run::run::run::{closure#0}
0.0%   0.2%  31.0KiB              prek <prek::languages::rust::rust::Rust as prek::languages::LanguageBackend>::install::{closure#0}
0.0%   0.2%  29.1KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  28.6KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.6KiB              toml <toml::de::deserializer::value::ValueDeserializer as serde_core::de::Deserializer>::deserialize_any::<<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor>
0.0%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble_alt
0.0%   0.2%  27.8KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.1KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
4.2%  86.8%  10.9MiB                   And 20293 smaller methods. Use -n N to show more.
4.9% 100.0%  12.6MiB                   .text section size, the file size is 257.7MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 0 regressions, 0 improvements above the 10% threshold.

Environment

• OS: Linux 6.17.0-1022-azure
• CPU: 4 cores
• prek version: prek 0.5.0+19 (ce77f56 2026-08-30)
• Rust version: rustc 1.98.0 (88d9e12ae 2026-08-18)
• Hyperfine version: hyperfine 1.20.0

CLI Commands

Benchmarking basic commands in the main repo:

prek --version

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base --version	1.8 ± 0.1	1.7	2.0	1.03 ± 0.07
prek-head --version	1.8 ± 0.1	1.6	2.4	1.00

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	7.8 ± 0.2	7.5	8.4	1.00
prek-head list	7.8 ± 0.2	7.4	8.4	1.00 ± 0.04

prek validate-config .pre-commit-config.yaml

⏭️ Skipped: .pre-commit-config.yaml not found

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.0 ± 0.0	1.9	2.2	1.00 ± 0.03
prek-head sample-config	2.0 ± 0.0	1.9	2.1	1.00

Cold vs Warm Runs

Comparing first run (cold) vs subsequent runs (warm cache):

prek run --all-files (cold - no cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	28.2 ± 1.2	26.6	30.6	1.01 ± 0.04
prek-head run --all-files	28.0 ± 0.5	27.1	28.5	1.00

prek run --all-files (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	28.3 ± 1.0	26.8	30.7	1.02 ± 0.05
prek-head run --all-files	27.8 ± 0.8	25.7	28.9	1.00

Full Hook Suite

Running the builtin hook suite on the benchmark workspace:

prek run --all-files (full builtin hook suite)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	28.0 ± 0.7	26.3	29.1	1.00
prek-head run --all-files	28.1 ± 0.7	25.7	29.6	1.00 ± 0.04

Individual Hook Performance

Benchmarking each hook individually on the test repo:

prek run trailing-whitespace --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run trailing-whitespace --all-files	9.7 ± 0.3	9.0	10.5	1.00
prek-head run trailing-whitespace --all-files	9.8 ± 0.3	9.1	10.7	1.01 ± 0.05

prek run end-of-file-fixer --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run end-of-file-fixer --all-files	8.7 ± 0.4	8.2	9.4	1.00
prek-head run end-of-file-fixer --all-files	9.1 ± 0.5	8.3	10.1	1.05 ± 0.07

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	6.4 ± 0.2	5.9	6.7	1.02 ± 0.04
prek-head run check-json --all-files	6.2 ± 0.2	6.0	6.5	1.00

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	6.1 ± 0.1	5.8	6.3	1.02 ± 0.03
prek-head run check-yaml --all-files	6.0 ± 0.1	5.6	6.2	1.00

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	5.9 ± 0.2	5.6	6.4	1.00
prek-head run check-toml --all-files	5.9 ± 0.2	5.4	6.4	1.00 ± 0.06

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	5.9 ± 0.2	5.6	6.3	1.00
prek-head run check-xml --all-files	6.1 ± 0.3	5.5	6.7	1.03 ± 0.06

prek run detect-private-key --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	8.1 ± 0.3	7.5	8.9	1.00
prek-head run detect-private-key --all-files	8.2 ± 0.4	7.2	9.0	1.01 ± 0.06

prek run fix-byte-order-marker --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run fix-byte-order-marker --all-files	10.4 ± 0.6	9.4	11.3	1.01 ± 0.07
prek-head run fix-byte-order-marker --all-files	10.3 ± 0.5	9.5	11.0	1.00

Installation Performance

Benchmarking hook installation (fast path hooks skip Python setup):

prek install-hooks (cold - no cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	3.7 ± 0.1	3.6	3.8	1.04 ± 0.02
prek-head install-hooks	3.6 ± 0.0	3.5	3.6	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	3.6 ± 0.0	3.5	3.6	1.00
prek-head install-hooks	3.7 ± 0.1	3.6	3.8	1.05 ± 0.03

File Filtering/Scoping Performance

Testing different file selection modes:

prek run (staged files only)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run	18.1 ± 0.3	17.7	18.8	1.00 ± 0.02
prek-head run	18.0 ± 0.3	17.7	19.0	1.00

prek run --files '*.json' (specific file type)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	4.2 ± 0.1	4.0	4.3	1.01 ± 0.03
prek-head run --files '*.json'	4.1 ± 0.1	4.0	4.3	1.00

Workspace Discovery & Initialization

Benchmarking hook discovery and initialization overhead:

prek run --dry-run --all-files (measures init overhead)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --dry-run --all-files	5.3 ± 0.1	5.2	5.4	1.00
prek-head run --dry-run --all-files	5.3 ± 0.1	5.1	5.6	1.00 ± 0.03

Meta Hooks Performance

Benchmarking meta hooks separately:

prek run check-hooks-apply --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-hooks-apply --all-files	6.3 ± 0.1	6.1	6.4	1.00
prek-head run check-hooks-apply --all-files	6.4 ± 0.2	6.1	6.7	1.02 ± 0.03

prek run check-useless-excludes --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	6.5 ± 0.3	6.2	7.2	1.01 ± 0.05
prek-head run check-useless-excludes --all-files	6.4 ± 0.1	6.2	6.7	1.00

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	5.5 ± 0.1	5.3	5.8	1.00
prek-head run identity --all-files	5.5 ± 0.1	5.3	5.7	1.00 ± 0.03