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 skills add Lonsdale201/wp-agent-skills --skill acf-value-storage-frontendgit clone --depth 1 https://github.com/Lonsdale201/wp-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/lonsdale201/wp-agent-skills/acf-value-storage-frontend)<a href="https://agentmods.dev/skills/lonsdale201/wp-agent-skills/acf-value-storage-frontend"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/acf-value-storage-frontend/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/lonsdale201/wp-agent-skills/acf-value-storage-frontend"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/acf-value-storage-frontend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00107 | $0.02092 |
| Opus 5.5 | $0.00043 | $0.00837 |
| Sonnet 5.5 | $0.00021 | $0.00418 |
| Haiku 4.5 | $0.00011 | $0.00209 |
Grade A, and why
acf-value-storage-frontend 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 28d 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 — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ACF value storage and frontend rendering
ACF normally stores a field as a pair:
acme_event_start = 2026-10-20 18:00:00
_acme_event_start = field_acme_event_start
The visible row contains the raw value. The underscore-prefixed row maps the
field name to its stable field key, which lets ACF find the field type and apply
the correct load/format behavior. A raw meta value without a valid reference can
look present in SQL while get_field() returns an unformatted value, no value,
or a value governed by a different field definition.
Storage locations
ACF $post_id |
WordPress storage | Example value/reference keys |
|---|---|---|
123 |
wp_postmeta |
field_name, _field_name |
user_12 |
wp_usermeta |
field_name, _field_name |
term_34 or category_34 |
wp_termmeta |
field_name, _field_name |
comment_56 |
wp_commentmeta |
field_name, _field_name |
option or options |
wp_options |
options_field_name, _options_field_name |
custom option target such as option_brand_a |
wp_options |
option_brand_a_field_name, _option_brand_a_field_name |
Numeric IDs mean posts. Pass the explicit prefixed target for every other object; do not rely on the current global object in imports, cron, REST, or CLI code.
Read with the shape you intend to render
$post_id = get_the_ID();
// Plain text: format through ACF, then escape for this HTML context.
$eyebrow = get_field( 'acme_eyebrow', $post_id );
if ( is_string( $eyebrow ) && '' !== $eyebrow ) {
echo '<p class="eyebrow">' . esc_html( $eyebrow ) . '</p>';
}
// WYSIWYG: ask ACF 6.2.6+ for its field-aware safe HTML value.
$body = get_field( 'acme_body', $post_id, true, true );
if ( is_string( $body ) && '' !== $body ) {
echo $body; // ACF returned the escaped/formatted value.
}
// Image configured to return an attachment ID.
$image_id = (int) get_field( 'acme_image', $post_id );
if ( $image_id ) {
echo wp_get_attachment_image( $image_id, 'large' );
}
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 28d ago First seen · 197 lines · 107 tokens per session scan A d4c30d5a45df
acf-value-storage-frontend is a skill published in the GitHub repository Lonsdale201/wp-agent-skills (24 stars, last pushed 4d ago), licensed MIT. It adds 107 tokens to every session and 2,092 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-27.
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