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stack/packages/mosaic/framework/tools/_scripts/mosaic-sync-skills
T
fargo 1556982dbc skills: single install path — canonical skills ship with the framework
Phase D2 of plan 2026-08-19: single package, single install, single command.

The framework installer already treats skills/** as a shipped, manifest-owned
framework subtree, so the folded skills now install into
$MOSAIC_HOME/skills with the rest of the framework — no second repository,
no separate sync step:

- mosaic-sync-skills (bash + powershell): the fetch machinery is gone (clone,
  pull, dirty-state migration, rsync from sources/agent-skills). The script
  now only links installed skills into runtime homes. --link-only is a compat
  no-op; --no-link exits having nothing to do.
- catalog.ts: the sources/agent-skills fallback is dead and removed.
- install.sh, launch.ts, defaults/README.md, README.md, skills/README.md:
  references to the second repo rewritten to describe the shipped path.

Verified: clean install into a fresh MOSAIC_HOME produces 102 skills with no
sources/ directory; the linker then links the selected skills into the four
runtime homes with no git involvement.
2026-08-19 14:39:28 -05:00

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#!/usr/bin/env bash
set -euo pipefail
# Link the INSTALLED canonical skills into runtime skill directories.
#
# The canonical skills ship inside the framework package itself
# (packages/mosaic/framework/skills in the monorepo) and are installed into
# $MOSAIC_HOME/skills by the framework installer — there is no second
# repository to clone. This script only maintains the runtime symlinks.
MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
MOSAIC_SKILLS_DIR="$MOSAIC_HOME/skills"
MOSAIC_LOCAL_SKILLS_DIR="$MOSAIC_HOME/skills-local"
# Colon-separated list of skill names to install. When set, only these skills
# are linked into runtime skill directories. Empty/unset = link all skills
# (the legacy "mosaic sync" full-catalog behavior).
MOSAIC_INSTALL_SKILLS="${MOSAIC_INSTALL_SKILLS:-}"
usage() {
cat <<USAGE
Usage: $(basename "$0") [options]
Link installed skills from ~/.config/mosaic/{skills,skills-local} into runtime
skill directories. Canonical skills arrive with the framework installer; this
script never clones or pulls a second repository.
Options:
--link-only Accepted for compatibility; linking is now the whole job
--no-link Do nothing (kept for compatibility)
-h, --help Show help
Env:
MOSAIC_HOME Default: ~/.config/mosaic
MOSAIC_INSTALL_SKILLS Colon-separated list of skills to link (default: all)
USAGE
}
while [[ $# -gt 0 ]]; do
case "$1" in
--link-only)
# Compat no-op: fetching a skills repo no longer exists.
shift
;;
--no-link)
echo "[mosaic-skills] Nothing to do (--no-link; canonical skills ship with the installer)"
exit 0
;;
-h|--help)
usage
exit 0
;;
*)
echo "Unknown argument: $1" >&2
usage >&2
exit 1
;;
esac
done
mkdir -p "$MOSAIC_HOME" "$MOSAIC_SKILLS_DIR" "$MOSAIC_LOCAL_SKILLS_DIR"
if [[ ! -d "$MOSAIC_SKILLS_DIR" ]]; then
echo "[mosaic-skills] Canonical skills dir missing: $MOSAIC_SKILLS_DIR" >&2
echo "[mosaic-skills] Canonical skills ship with the framework — reinstall or update the framework package" >&2
exit 1
fi
# Skills are linked into the MOSAIC-OWNED harness homes, never a base install.
# Paths mirror the config-dir env vars the launcher injects (HARNESS_HOME_ENV in
# commands/launch.js):
# claude CLAUDE_CONFIG_DIR -> <home>/skills
# pi PI_CODING_AGENT_DIR -> <home>/skills (replaces ~/.pi/agent)
# codex CODEX_HOME -> <home>/skills
# opencode XDG_CONFIG_HOME -> <home>/opencode/skills (XDG adds a level)
link_targets=(
"$MOSAIC_HOME/.claude/skills"
"$MOSAIC_HOME/.codex/skills"
"$MOSAIC_HOME/.opencode/opencode/skills"
"$MOSAIC_HOME/.pi/skills"
)
# Pre-isolation installs planted the same symlink farm directly in the operator's
# base installs. Those are now orphaned: the launcher no longer reads them, but
# they persist and make a "clean" base install look mosaic-managed.
legacy_link_targets=(
"$HOME/.claude/skills"
"$HOME/.codex/skills"
"$HOME/.config/opencode/skills"
"$HOME/.pi/agent/skills"
)
canonical_real="$(readlink -f "$MOSAIC_SKILLS_DIR")"
local_real="$(readlink -f "$MOSAIC_LOCAL_SKILLS_DIR")"
# Build an associative array from the colon-separated whitelist for O(1) lookup.
# When MOSAIC_INSTALL_SKILLS is empty, all skills are allowed.
declare -A _skill_whitelist=()
_whitelist_active=0
if [[ -n "$MOSAIC_INSTALL_SKILLS" ]]; then
_whitelist_active=1
IFS=':' read -ra _wl_items <<< "$MOSAIC_INSTALL_SKILLS"
for _item in "${_wl_items[@]}"; do
[[ -n "$_item" ]] && _skill_whitelist["$_item"]=1
done
fi
is_skill_selected() {
local name="$1"
if [[ $_whitelist_active -eq 0 ]]; then
return 0
fi
[[ -n "${_skill_whitelist[$name]:-}" ]] && return 0
return 1
}
link_skill_into_target() {
local skill_path="$1"
local target_dir="$2"
local name link_path
name="$(basename "$skill_path")"
# Do not distribute hidden/system skill directories globally.
if [[ "$name" == .* ]]; then
return
fi
# Respect the install whitelist (set during first-run wizard).
if ! is_skill_selected "$name"; then
return
fi
link_path="$target_dir/$name"
if [[ -L "$link_path" ]]; then
local raw_target resolved_target
raw_target="$(readlink "$link_path")"
resolved_target="$(node -e 'const p=require("node:path"); process.stdout.write(p.resolve(p.dirname(process.argv[1]), process.argv[2]));' "$link_path" "$raw_target")"
if [[ "$resolved_target" == "$canonical_real/"* || "$resolved_target" == "$local_real/"* ]]; then
ln -sfn "$skill_path" "$link_path"
else
echo "[mosaic-skills] Preserve foreign runtime symlink: $link_path"
fi
return
fi
if [[ -e "$link_path" ]]; then
echo "[mosaic-skills] Preserve existing runtime-specific entry: $link_path"
return
fi
ln -s "$skill_path" "$link_path"
}
is_mosaic_skill_name() {
local name="$1"
# -d follows symlinks; -L catches broken symlinks that still indicate ownership
[[ -d "$MOSAIC_SKILLS_DIR/$name" || -L "$MOSAIC_SKILLS_DIR/$name" ]] && return 0
[[ -d "$MOSAIC_LOCAL_SKILLS_DIR/$name" || -L "$MOSAIC_LOCAL_SKILLS_DIR/$name" ]] && return 0
return 1
}
prune_stale_links_in_target() {
local target_dir="$1"
while IFS= read -r -d '' link_path; do
local name resolved
name="$(basename "$link_path")"
if is_mosaic_skill_name "$name"; then
continue
fi
# -m resolves lexical dangling targets too. If resolution fails, ownership
# is unproven and the link must be preserved.
resolved="$(readlink -m "$link_path" 2>/dev/null || true)"
# $canonical_real must be length-checked BEFORE use as a prefix: if it were
# ever empty, "$resolved" == "$canonical_real/"* collapses to == "/"* and
# matches every absolute path. Combined with the is_mosaic_skill_name skip
# above, that inverts the function precisely — it would delete exactly the
# FOREIGN symlinks and keep the mosaic ones. (#1087, reported by mos-claude.)
if [[ -n "$resolved" && -n "$canonical_real" && "$resolved" == "$canonical_real/"* ]]; then
rm -f "$link_path"
echo "[mosaic-skills] Removed stale retired skill link: $link_path"
fi
done < <(find "$target_dir" -mindepth 1 -maxdepth 1 -type l -print0)
}
# Remove mosaic-owned symlinks left in a base install by a pre-isolation sync.
#
# Ownership is proven by RESOLUTION, not by name: only links resolving inside the
# canonical or local skills dirs are removed. Anything else — a real directory, a
# link elsewhere, an unresolvable link — is left untouched. This mirrors the
# refusal in commands/skill.js ("only symlinks pointing inside the Mosaic skills
# directory are managed") and preserves e.g. codex's own `.system` dir.
#
# The directory itself is kept: mosaic-doctor warns when ~/.pi/agent/skills is
# missing, and an empty dir is the correct end state, not an absent one.
cleanup_legacy_target() {
local target_dir="$1"
local removed=0 kept=0
[[ -d "$target_dir" ]] || return 0
while IFS= read -r -d '' link_path; do
local resolved owned=0
resolved="$(readlink -m "$link_path" 2>/dev/null || true)"
# Guard the empty-prefix trap: an unset *_real would make "$resolved" == "/"*
# match every absolute path and delete foreign links.
if [[ -n "$resolved" ]]; then
if [[ -n "$canonical_real" && "$resolved" == "$canonical_real/"* ]]; then
owned=1
elif [[ -n "$local_real" && "$resolved" == "$local_real/"* ]]; then
owned=1
fi
fi
if [[ $owned -eq 1 ]]; then
rm -f "$link_path"
removed=$((removed + 1))
else
kept=$((kept + 1))
fi
done < <(find "$target_dir" -mindepth 1 -maxdepth 1 -type l -print0)
if [[ $removed -gt 0 ]]; then
echo "[mosaic-skills] Legacy cleanup: removed $removed mosaic symlink(s) from $target_dir (preserved $kept foreign)"
fi
}
for legacy in "${legacy_link_targets[@]}"; do
# Skip anything that is also a current target, so isolation can never
# self-destruct if the two lists ever overlap.
skip=0
for target in "${link_targets[@]}"; do
[[ "$legacy" == "$target" ]] && skip=1
done
[[ $skip -eq 1 ]] && continue
cleanup_legacy_target "$legacy"
done
for target in "${link_targets[@]}"; do
mkdir -p "$target"
# If target already resolves to canonical dir, skip to avoid self-link recursion/corruption.
target_real="$(readlink -f "$target" 2>/dev/null || true)"
if [[ -n "$target_real" && "$target_real" == "$canonical_real" ]]; then
echo "[mosaic-skills] Skip target (already canonical): $target"
continue
fi
prune_stale_links_in_target "$target"
while IFS= read -r -d '' skill; do
link_skill_into_target "$skill" "$target"
done < <(find "$MOSAIC_SKILLS_DIR" -mindepth 1 -maxdepth 1 -type d -print0)
if [[ -d "$MOSAIC_LOCAL_SKILLS_DIR" ]]; then
while IFS= read -r -d '' skill; do
link_skill_into_target "$skill" "$target"
done < <(find "$MOSAIC_LOCAL_SKILLS_DIR" -mindepth 1 -maxdepth 1 \( -type d -o -type l \) -print0)
fi
echo "[mosaic-skills] Linked skills into: $target"
done
echo "[mosaic-skills] Complete"