A Git-compatible VCS that is both simple and powerful
This report summarizes scanner evidence for jj-vcs/jj, a Rust project with 32,314 GitHub stars. SynthScan examined 331,160 lines of code across 675 source files, recording 908 pattern matches distributed across 11 syntactic categories. The legacy adjusted pattern signal is 2.9 (Low pattern signal); it is not an authorship estimate.
Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.
Use each vector to guide manual verification of the underlying findings.
Payload schema: 1.0.0 · Engine: 2.0.0 · Scoring: heuristic-density-v1 · Scan date: 2026-10-31.
Can maintainers explain intent, assumptions, and trade-offs? 882 finding(s).
Are imports declared and package/API names verified? 23 finding(s).
Are wrappers, guards, and repeated structures necessary? 3 finding(s).
Which changes need focused human review? 908 finding(s).
This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.
Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.
This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.
The scanner identified 908 distinct pattern matches across 11 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | deny.toml | 1 | # This template contains all of the possible sections and their default values | COMMENT |
| LOW | deny.toml | 21 | # `target_family = "unix"` configuration, that only having windows targets in | COMMENT |
| LOW | deny.toml | 41 | #exclude = [] | COMMENT |
| LOW | deny.toml | 61 | COMMENT | |
| LOW | deny.toml | 101 | ] | COMMENT |
| LOW | deny.toml | 121 | # The SPDX expression for the license requirements of the crate | COMMENT |
| LOW | deny.toml | 141 | # not have its license(s) checked | COMMENT |
| LOW | deny.toml | 161 | # the workspace that is being checked. This can be overridden by allowing/denying | COMMENT |
| LOW | deny.toml | 181 | COMMENT | |
| LOW | deny.toml | 201 | # If true, the allowed features must exactly match the enabled feature set. If | COMMENT |
| LOW | deny.toml | 221 | # https://embarkstudios.github.io/cargo-deny/checks/sources/cfg.html | COMMENT |
| LOW | .config/rumdl.toml | 1 | # Rumdl enables these rules by default. We disable the ones that report findings | COMMENT |
| LOW | .config/rumdl.toml | 21 | # 4 findings. Heading levels should only increment by one level at a time. | COMMENT |
| LOW | .config/rumdl.toml | 41 | "commands-show-output", | COMMENT |
| LOW | .config/rumdl.toml | 61 | # https://github.com/rvben/rumdl/blob/main/docs/md031.md | COMMENT |
| LOW | .config/rumdl.toml | 81 | # 44 findings. Code blocks should use a consistent style. | COMMENT |
| LOW | .config/rumdl.toml | 121 | # [heading-increment] | COMMENT |
| LOW | .config/rumdl.toml | 141 | # code-blocks = true | COMMENT |
| LOW | .config/rumdl.toml | 161 | # [blanks-around-headings] | COMMENT |
| LOW | .config/rumdl.toml | 181 | # ol-single = 1 | COMMENT |
| LOW | .config/rumdl.toml | 201 | # [fenced-code-language] | COMMENT |
| LOW | .config/rumdl.toml | 221 | # [link-fragments] | COMMENT |
| LOW | .config/rumdl.toml | 241 | COMMENT | |
| LOW | core/src/file_util.rs | 1 | // Copyright 2021 The Jujutsu Authors | COMMENT |
| LOW | core/src/file_util.rs | 101 | COMMENT | |
| LOW | core/src/commit.rs | 1 | // Copyright 2020 The Jujutsu Authors | COMMENT |
| LOW | core/src/operation.rs | 1 | // Copyright 2020 The Jujutsu Authors | COMMENT |
| LOW | core/src/tree_walk.rs | 1 | // Copyright 2026 The Jujutsu Authors | COMMENT |
| LOW | core/src/tree_walk.rs | 121 | COMMENT | |
| LOW | core/src/merged_tree.rs | 1 | // Copyright 2023 The Jujutsu Authors | COMMENT |
| LOW | core/src/graph.rs | 1 | // Copyright 2021-2023 The Jujutsu Authors | COMMENT |
| LOW | core/src/graph.rs | 141 | /// If no branches are prioritized, the branch containing the first commit in | COMMENT |
| LOW | core/src/tree_merge.rs | 1 | // Copyright 2023-2025 The Jujutsu Authors | COMMENT |
| LOW | core/src/backend.rs | 1 | // Copyright 2020 The Jujutsu Authors | COMMENT |
| LOW | core/src/backend.rs | 181 | #[derive(ContentHash, Debug, PartialEq, Eq, Clone, serde::Serialize)] | COMMENT |
| LOW | core/src/backend.rs | 201 | /// The change ID of this commit. This is a stable identifier that follows | COMMENT |
| LOW | core/src/backend.rs | 221 | pub target_commit: CommitId, | COMMENT |
| LOW | core/src/backend.rs | 241 | } | COMMENT |
| LOW | core/src/backend.rs | 261 | /// A `CopyHistory` along with its `CopyId`. | COMMENT |
| LOW | core/src/backend.rs | 301 | /// UTF-8, such as a symlink target with invalid UTF-8 stored in the Git | COMMENT |
| LOW | core/src/backend.rs | 321 | /// The source error. | COMMENT |
| LOW | core/src/backend.rs | 361 | }, | COMMENT |
| LOW | core/src/backend.rs | 421 | /// (`Merge::is_absent()`). For example, when getting the value at a | COMMENT |
| LOW | core/src/backend.rs | 801 | /// | COMMENT |
| LOW | core/src/backend.rs | 821 | /// called this method, since `Store` shares the read between concurrent | COMMENT |
| LOW | core/src/backend.rs | 841 | /// committer name to an authenticated user's name, or the backend's | COMMENT |
| LOW | core/src/backend.rs | 861 | /// to be reverse-topological. That is, for any two copy records with | COMMENT |
| LOW | core/src/lib.rs | 1 | // Copyright 2026 The Jujutsu Authors | COMMENT |
| LOW | core/src/op_store.rs | 1 | // Copyright 2020 The Jujutsu Authors | COMMENT |
| LOW | core/src/op_store.rs | 281 | COMMENT | |
| LOW | core/src/op_store.rs | 301 | /// Details of this operation. | COMMENT |
| LOW | core/src/op_store.rs | 381 | COMMENT | |
| LOW | core/src/index.rs | 1 | // Copyright 2020 The Jujutsu Authors | COMMENT |
| LOW | core/src/index.rs | 41 | #[error("Cannot collect all heads by index of this type")] | COMMENT |
| LOW | core/src/index.rs | 181 | } | COMMENT |
| LOW | core/src/index.rs | 261 | async fn resolve_prefix( | COMMENT |
| LOW | core/src/conflict_labels.rs | 1 | // Copyright 2025 The Jujutsu Authors | COMMENT |
| LOW | core/src/repo_path.rs | 1 | // Copyright 2020 The Jujutsu Authors | COMMENT |
| LOW | core/src/repo_path.rs | 441 | /// Returns the `(common_prefix, self_remainder)`. | COMMENT |
| LOW | core/src/iter_util.rs | 1 | // Copyright 2025 The Jujutsu Authors | COMMENT |
| 802 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | web/docs/src/content/docs/config.md | 2009 | email = "YOUR_OSS_EMAIL@example.org" | STRING |
| LOW | web/docs/src/content/docs/revsets.md | 549 | 'user()' = 'user("me@example.org")' | CODE |
| LOW | docs/config.md | 2523 | email = "YOUR_OSS_EMAIL@example.org" | STRING |
| LOW | docs/revsets.md | 599 | 'user()' = 'user("me@example.org")' | CODE |
| LOW | cli/tests/test_git_init.rs | 1151 | user.email = 'base@example.org' | CODE |
| LOW | cli/tests/test_git_init.rs | 1156 | user.email = 'new-repo@example.org' | CODE |
| LOW | cli/tests/test_git_clone.rs | 966 | user.email = 'base@example.org' | CODE |
| LOW | cli/tests/test_git_clone.rs | 971 | user.email = 'new-repo@example.org' | CODE |
| LOW | cli/src/text_util.rs | 729 | split_email("user@example.com"), | CODE |
| LOW | cli/src/config.rs | 1312 | assert_eq!(parse("John Doe")?.as_str(), Some("John Doe")); | CODE |
| LOW | cli/src/template_builder.rs | 3901 | literal(new_signature("User", "user@example.com")) | CODE |
| LOW | cli/src/template_builder.rs | 4040 | literal(new_signature("User", "user@example.com")) | CODE |
| LOW | cli/src/template_builder.rs | 5733 | literal(new_signature("User", "user@example.com")) | CODE |
| LOW | cli/src/config/colors.toml | 40 | "placeholder" = "red" | CODE |
| LOW | lib/testutils/src/git.rs | 24 | pub const GIT_EMAIL: &str = "someone@example.org"; | CODE |
| LOW | lib/src/trailer.rs | 49 | /// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod | COMMENT |
| LOW | lib/src/trailer.rs | 49 | /// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod | COMMENT |
| LOW | lib/src/trailer.rs | 153 | Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed | CODE |
| LOW | lib/src/trailer.rs | 153 | Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed | CODE |
| LOW | lib/src/trailer.rs | 186 | Summary: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod | CODE |
| LOW | lib/src/trailer.rs | 186 | Summary: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| CRITICAL | cli/src/commit_ref_list.rs | 498 | .map(|c| c.author.timestamp.timestamp.0.to_string()) | CODE |
| CRITICAL | cli/src/commit_ref_list.rs | 508 | .map(|c| c.committer.timestamp.timestamp.0.to_string()) | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | web/docs/src/content/docs/config.md | 0 | /// set -euo pipefail /// echo "look ma, everything in one file!" /// echo "args: $@" /// | STRING |
| HIGH | docs/config.md | 0 | /// set -euo pipefail /// echo "look ma, everything in one file!" /// echo "args: $@" /// | STRING |
| HIGH | cli/src/commands/util/exec.rs | 0 | /// set -euo pipefail /// echo "look ma, everything in one file!" /// echo "args: $@" /// | STRING |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | web/docs/src/content/docs/FAQ.md | 332 | #### Step 1: Find the commit ID for the "last good version" | COMMENT |
| LOW | web/docs/src/content/docs/FAQ.md | 414 | #### Step 2: Create a new change on top of the original revision | COMMENT |
| LOW | web/docs/src/content/docs/FAQ.md | 455 | #### Step 3: Move any bookmarks to the original revision | COMMENT |
| LOW | web/docs/src/content/docs/FAQ.md | 461 | #### Step 4: Abandon the unwanted revision | COMMENT |
| LOW | docs/FAQ.md | 344 | #### Step 1: Find the commit ID for the "last good version" | COMMENT |
| LOW | docs/FAQ.md | 428 | #### Step 2: Create a new change on top of the original revision | COMMENT |
| LOW | docs/FAQ.md | 472 | #### Step 3: Move any bookmarks to the original revision | COMMENT |
| LOW | docs/FAQ.md | 478 | #### Step 4: Abandon the unwanted revision | COMMENT |
| LOW | lib/src/graph_dominators.rs | 281 | // Step 1: Compute Dominators on Reverse Graph | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | web/docs/package-lock.json | 7064 | "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.3.tgz", | CODE |
| MEDIUM | cli/tests/test_global_opts.rs | 1404 | // The timestamp is constant sized so this is a robust operation. | COMMENT |
| MEDIUM | lib/src/secure_config.rs | 308 | // In the future, we consider something a little more robust, where as | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | cli/tests/test_alias.rs | 342 | # Create a disabled alias. | COMMENT |
| MEDIUM | lib/src/secure_config.rs | 44 | # This file is for old versions of jj. | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | AI_POLICY.md | 11 | If a substantial part of your contribution is generated by AI, please | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | web/docs/src/content/docs/config.toml | 3 | # Don't forget to change these to your own details! | COMMENT |
| LOW | docs/config.toml | 3 | # Don't forget to change these to your own details! | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | lib/src/graph_dominators.rs | 281 | // Step 1: Compute Dominators on Reverse Graph | COMMENT |
| LOW | lib/src/git.rs | 497 | // a tag or not, and we need to check if it's a commit object. | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | lib/tests/test_merge_trees.rs | 116 | // TODO: Add tests for simplification of multi-way conflicts. Both the content | COMMENT |