Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/ericfitz/skills/backfillnpx skills add ericfitz/skills --skill backfillgit clone --depth 1 https://github.com/ericfitz/skillsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00036 | $0.01742 |
| Opus 5 | $0.00018 | $0.00871 |
| Sonnet 5 | $0.00007 | $0.00348 |
| Haiku 4.5 | $0.00004 | $0.00174 |
Grade A, and why
backfill scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Localization Backfill
Translate every missing or untranslated key across all i18n locale files using the master locale as the source.
This command orchestrates a set of skills; the skills do not assume any particular i18n tooling. Project-specific paths and commands come from .claude/i18n.config.json.
Bundled scripts
scripts/find_duplicate_localizations.py— bundled dedupe analyzer used in Step 1 of this skill.- The translation analysis itself runs through [[analyze]], which bundles its own
scripts/check-i18n.py.
When you see ${CLAUDE_PLUGIN_ROOT} below, it refers to this plugin's install root — typically ~/.claude/plugins/cache/efitz-skills/loc/<version>/. If Claude Code does not pre-substitute the variable when you read this file, resolve it yourself: locate the directory containing this SKILL.md, walk up to the plugin root, and use that absolute path. Do NOT fall back to the legacy path ~/Projects/skills/commands/localization-backfill.scripts/.
Configuration
Same config used by the i18n skill family — see [[analyze]] for the full schema. Required fields:
locales_dirmaster_localefile_extension
Optional:
{
"format_command": "<shell command that normalizes formatting, e.g. 'pnpm run format'>",
"dedupe_plan_file": "<path where the dedupe script writes its plan, default 'localization_dedup_plan.txt'>"
}
If format_command is absent, the format step is skipped.
Process
Step 1: Deduplicate
Run the bundled dedupe script (${CLAUDE_PLUGIN_ROOT} is the root directory of this plugin):
uv run "${CLAUDE_PLUGIN_ROOT}/scripts/find_duplicate_localizations.py" \
--skippolicy --reference
The script reads .claude/i18n.config.json to find the master locale, then writes its plan to localization_dedup_plan.txt in the current directory (override with -o).
Then:
- Read the plan file.
- If it contains REFER recommendations:
- Back up locale files:
mkdir -p /tmp/i18n-dedup-backups && cp <locales_dir>/*.<ext> /tmp/i18n-dedup-backups/. - Apply each REFER change to the master locale — replace the literal value with a
{{reference}}template. - Apply the same reference change to every non-master locale (jq filter).
- Run
format_commandfrom config if present. - Re-run the dedupe script to verify zero duplicates remain.
- Back up locale files:
- If no duplicates, continue to step 2.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 222 lines · 36 tokens per session scan A f2c3e9e93ea7
backfill is a skill published in the GitHub repository ericfitz/skills (2 stars, last pushed 9d ago), licensed Apache-2.0. It adds 36 tokens to every session and 1,742 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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