Grasp · Comprehension Index Scan Report
Who still understands psf/black?
Computed from git metadata only; no source code contents were read.
touch-weighted · 3-year history window · last commit 59d ago · scores are comparable only against same-mode scans
Grasp Score
51
touch-weighted living knowledge across the repo
Active humans
17 / 194
contributors active in last 90 days vs. all-time
AI-attributed minimum
≥ 14.7%
hard evidence only. Just 42% of commits
here carry any attribution signal, so the real share is higher
Inactive share
55.0%
work by authors with no commit in the window; silence, not proof of departure
Composition
33/30/32/5%
source / tests / docs / config share of scored work
Living, source only
47%
the headline recomputed over hand-written source alone
Score stability
volatile
90-day-cliff variant reads 0%–64% across 60/90/180-day activity windows; read the width before the middle value
Squash-merged history: 98% of the commits analysed here collapsed a whole pull
request into one commit by one author. Squashing credits a single person for everyone's work
and can strip the co-author trailers that name the rest (measured across heavy squashers,
roughly a quarter to a third of squash commits still carry them, and those are credited), so for
this repository the concentration figures are an upper bound, the bus factors are a lower bound,
and the AI-attribution minimum is lower than it would be with the same work merged
conventionally. That
information is destroyed at merge time and cannot be recovered from the repository, so it is
reported rather than corrected. Comparisons against a project that does not squash are
comparisons across two different record-keeping systems.
Dark-code ranking
Modules ranked by comprehension risk: the unknown share, amplified by
ongoing change and thin ownership. The green meter is living knowledge.
| Module | Risk | Living knowledge | AI-attr. |
Inactive | Bus | Heat/180d |
|---|
| src | LOW 48 | | 15% | 62% | 2 | 133 |
| (root) | LOW 45 | | 18% | 55% | 2 | 122 |
| tests | LOW 44 | | 8% | 51% | 2 | 66 |
| scripts | LOW 43 | | 22% | 64% | 1 | 9 |
| docs | LOW 42 | | 23% | 49% | 2 | 78 |
| .github | LOW 37 | | 9% | 42% | 2 | 57 |
Public-repo caveat: "departed" includes drive-by contributors, overstating attrition
relative to a company repo with a real roster. Engagement is a proxy for comprehension.
Treat it as a potential indicator rather than a diagnosis.