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Peter Schilling
78f1812493
Agents asked to put a visible screenshot on an issue reach for
`issue attach`, which uploads the file but creates a sidebar link
attachment that never renders inline — while the success output
("Attachment created") convinces them the image is visible. The working
path, `issue comment add --attach`, has existed since v2.0.0 but nothing
pointed at it: the skill had no image guidance and the flag was buried in
a reference table.
Three coordinated changes, validated as experiment 2 of the skill eval:
- Skill: a Common Tasks recipe for visible images via
`issue comment add --attach`, with an explicit warning about
`issue attach`'s sidebar-only behavior.
- CLI: `issue attach` now says it created a sidebar link attachment,
and for images prints a copy-pasteable hint suggesting
`issue comment add --attach` (shell-quoted, --public preserved).
Help descriptions updated on both commands.
- Eval: new frozen image family (trap-phrased development prompt,
comment-phrased holdout) plus a sidebar-control case graded on
positionals, with pre-declared outcome rules, CLI/API control split,
binary-safe fixture checks, and version-matched shim output.
Result (rules frozen before baseline): image-development went 0/3 to 3/3
— every baseline trial fell into the attach trap and wrongly reported
success; every post-change trial routed straight to the recipe. Image
family 3/6 to 6/6 lands in the pre-declared partial-baseline band, so it
is reported as consistent with improvement (exploratory Fisher p = 0.09)
rather than confirmed. Controls held except one known npx-version-check
grader artifact, adjudicated by an Opus gold-label pass (17/18 agreement
with the deterministic grader).