Conciseness

Every section carries API-specific knowledge Claude could not infer — 'An inner Card renders as a titled section, because chat cards cannot nest', '$bindState and $bindItem have no effect because posted messages have no inputs', 'Expansion stops at maxElements (default 1000 elements and table rows)' — with zero explanation of known concepts. Matches 'lean and efficient; assumes Claude's competence; every token earns its place'; the 4 anchor's over-explanation instances are absent.

Actionability

The Quick start is complete, copy-paste-ready TypeScript covering the primary streaming use case, and secondary APIs are given concretely — 'toCard(spec, options) converts a complete spec', 'Pass limits … for example { tables: 1, charts: 2 } for Slack', 'cardToSlackBlocks from @chat-adapter/slack/blocks'. Matches 'fully executable; copy-paste ready code or commands; specific examples cover the common cases'; not 4 because no guidance is left at the hint or pseudocode level.

Workflow Clarity

The Quick start sequences the full flow (defineCatalog → streamText with catalog.prompt() → streamCard) and the Validation section gives an explicit feedback loop — 'toCard throws CardSpecError with an issues array … Send the issues back to the model to repair the spec' — matching 'clear sequence with most checkpoints present; minor validation gaps'. Not 5 because the primary streamCard path only says it 'finishes with a validated card' without specifying error recovery if the stream produces an invalid spec; not 3 because a concrete validate-and-repair loop is explicitly written for toCard.

Progressive Disclosure

The body is well-organized into six clearly headed sections (Quick start, Spec structure, State/repeat/visibility, Validation and limits, Runtime) and no bundle files exist, so nothing is mis-placed across files. Matches 'good structure; most content is appropriately placed; minor organization gaps' — the ~30-line JSON spec example is inline and the body runs ~80 lines, beyond the under-50-line case where sections alone would earn a 5; not 3 because nothing that clearly belongs in a separate reference file is inlined.

Specificity

Quotes concrete actions — 'turns JSON specs into native chat cards (Block Kit on Slack, Adaptive Cards on Teams, and the card format of other Chat SDK adapters)' and 'streaming a generated card into a chat thread' — which matches the 'several specific actions; minor gaps' anchor. Not 5 because only two core actions are named (conversion and streaming), less comprehensive than the 5-anchor's multi-action example; not 3 because the actions are specific and multi-platform rather than minimal or generic.

Completeness

Explicitly answers both: what ('Chat SDK renderer for json-render that turns JSON specs into native chat cards…') and when ('Use when working with @json-render/chat, building bots…, streaming a generated card…, or when the user mentions Chat SDK, Slack Block Kit, or Teams Adaptive Cards together with json-render'). This matches the 5 anchor's clear what + when with concrete trigger phrases; the 4 anchor's weaker 'when' does not apply.

Trigger Term Quality

Includes natural terms users would say — 'Chat SDK', 'Slack Block Kit', 'Teams Adaptive Cards', '@json-render/chat', 'building bots that post rich messages with tables, charts, fields, or buttons' — matching 'good keyword coverage; a few natural terms missing'. Not 5 because common variations like bare 'chat cards', 'Slack bots', or 'posting cards to Slack/Teams' are absent and the platform terms are gated by 'together with json-render'; not 3 because coverage goes well beyond a single keyword with platform synonyms included.

Distinctiveness Conflict Risk

Clear niche (json-render chat card rendering) with distinct triggers tied to specific platform names, and the 'together with json-render' qualifier further reduces false triggering — matching 'clear niche with distinct triggers; minimal conflict risk'. Not 4 because overlap risk with generic chat/messaging skills is negligible given the tightly scoped triggers.