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platform-norm-profiler

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Use when the user asks to "build the norm card for this platform", "what are the char limits and visible-fold cutoffs here", "is the LinkedIn link-in-first-comment thing documented or folklore", or "which of our platform cards are stale"; maintains the dated, versioned per-platform norm cards in the references/platforms/ pack — char limits, visible-fold cutoffs, hashtag norms, format/aspect specs, link and first-comment placement, disclosure-label mechanics, algorithm emphases (e.g. 小红书 search+saves weighting) — every row labeled platform-documented (official doc, Measured) or Estimated-folklore (named source) with last-verified and review-by dates, and any card past its review date flagged stale rather than trusted. Extends the single pack in place; never forks a second one. Not for picking which channels to run — use channel-portfolio-planner. 平台规范卡/字符限制/折叠线/话题标签/算法侧重/过期标记

social/explore/platform-norm-profiler/SKILL.md

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# Platform Norm Profiler

Maintains the dated, versioned per-platform norm cards the Craft phase drafts against — char limits, visible-fold cutoffs, hashtag norms, format/aspect specs, link and first-comment placement, disclosure-label mechanics, and algorithm emphases — every row labeled platform-documented (Measured, official doc) or Estimated-folklore (named source) with a last-verified date. It feeds four [ECHO](../../../references/echo-benchmark.md) sub-items directly: the three C dated-norm-card items — platform adaptation, never verbatim cross-posting (C3), format specs citing the dated card (C4), and link/first-comment placement per the card (C9) — plus the E rule-digest-current item (E4). [social-quality-auditor](../../host/social-quality-auditor/SKILL.md) judges those items against the cards this skill keeps fresh. The anti-staleness rule is the whole point: **a norm card older than its review-by date is flagged, not trusted.**

**Scope guard**: this skill maintains norm cards only. It does NOT pick which channels to run ([channel-portfolio-planner](../channel-portfolio-planner/SKILL.md)), write brand voice rules (`voice-dossier-builder`), draft posts ([social-creative-builder](../../craft/social-creative-builder/SKILL.md)), or compute the ECHO profile result / run vetoes (the gate's job). It EXTENDS the single platform pack under [references/platforms/](../../../references/platforms/) by adding or refreshing each card's organic-engagement section in place — never a second pack, no per-project card copies, no `memory/` shadow pack. Platform folklore stays Estimated with a named source and never becomes a scored rule. Channel-specific rule-snapshot pointers go to `memory/events/channels.ndjson` via an authorized `operation: propose` request to `registry-events.py` only — [channel-registry](../../../protocol/channel-registry/SKILL.md) is the sole writer of `memory/channels/`.

## Quick Start

```
Build the organic-engagement section of the 小红书 norm card: char limits, fold cutoffs, hashtag norms, format specs, algorithm emphases — label and date every row.
```

```
Staleness sweep: flag every platform card past its review-by date before the next calendar build.
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