skills: parameterized computed fields + the client in the computed field context

[evgenovalov]

Two computed-field capabilities were missing from the skills. Parameterized computed fields shipped in v3.9.0 and are in references/orm/computed-fields.md, but no SKILL.md mentions them. The client in the computed field context shipped in v3.9.1 (release, zenstackhq/zenstack#2789).

Only the hand-written SKILL.md files are touched — references/ and skills/*/references/ are generated, so the reference copy of the client docs will arrive with the next chore: sync docs once zenstackhq/zenstack-docs#634 lands.

zenstack-schema-modeling — declaration side

New ### Parameterized computed fields (v3.9.0+) under Computed fields: declaring typed parameters after the field name, the ZModel→TS type mapping, and the rule that such a field is never returned by default.

zenstack-querying — implementation and call sites

• Rules for every implementation — three constraints an agent otherwise gets wrong:
  • return the expression synchronously;
  • the body is raw Kysely, so bind the dialect's native value (a JS Date fails to bind on SQLite — pass date.toISOString());
  • a Boolean @computed field needs OperandExpression<boolean>, and a bare comparison is Kysely's SqlBool (boolean | 0 | 1), which does not typecheck.
• ### Parameterized computed fields (v3.9.0+) — args as the third callback parameter, the not-returned-by-default rule, args being plain serializable data, a table of the arg shape per site (select/include, where/having, orderBy, aggregate, groupBy.by), and the correlated-GROUP BY caveat.
• ### client in the context (v3.9.1+) — client.$auth, $setAuth() returning a new client (per-request client, no module-level auth state), that $auth needs no policy plugin, and that client must never be awaited.

Three examples, easy → complex, per the house style: isMine from client.$auth; recentPostCount(since); and a combined parameterized and client-aware myCommentCount(since).

Verification

Every example was run against a real client on sqlite and postgresql before being written up — including the combined one, select/where/orderBy/aggregate arg shapes, and a parameterized field being absent from a plain findFirst(). The two binding rules come from failures I hit while doing that: a raw Date aborts the SQLite query, and a bare comparison fails to typecheck against a generated schema carrying a Boolean @computed field. npx skills add ./ --list lists both skills without complaint.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Expanded guidance for computed fields, including synchronous callbacks, parameterized fields, typed arguments, serialization, and default result behavior.
  • Documented database-specific date binding and GROUP BY considerations.
  • Added guidance for caller-aware computed fields using authentication context and immutable clients.
  • Included combined examples for parameterized and client-aware fields.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9339e493-4f35-428f-83ac-0dd354335dbf

📥 Commits

Reviewing files that changed from the base of the PR and between fb0c535 and f191366.

📒 Files selected for processing (2)

• skills/zenstack-querying/SKILL.md
• skills/zenstack-schema-modeling/SKILL.md

📝 Walkthrough

Walkthrough

The changes expand computed-field documentation with typed runtime parameters, caller-aware access through context.client, callback implementation rules, query selection requirements, serialization behavior, and combined examples.

Changes

Computed field guidance

Layer / File(s)	Summary
Parameterized computed-field contract skills/zenstack-schema-modeling/SKILL.md	Documents parameter syntax, callback arguments, scalar-to-TypeScript mapping, and required args in select or include.
Computed-field query behavior skills/zenstack-querying/SKILL.md	Documents synchronous callbacks, dialect-specific date binding, boolean expression typing, parameter handling, caller-aware fields through context.client, and combined usage examples.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to fb0c5

This PR adds guidance and examples for parameterized and client-aware computed fields, but the current documentation still needs follow-up to clarify argument requirements, protect caller identity handling, avoid an unsafe anonymous-user assumption, and define all variables in the combined example. The changes are mergeable with explicit owner awareness of these bounded documentation risks.

Suggested reviewers: ymc9

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the two main documentation changes: parameterized computed fields and the computed-field client context.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@skills/zenstack-schema-modeling/SKILL.md`:
- Around line 302-304: Update the parameterized-field guidance in the schema
modeling documentation: state that every use site, including where, having,
orderBy, aggregate, and groupBy, must provide args, while select/include is
specifically required when returning the field value. Remove the claim that
parameterized fields cannot be used outside select/include.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a18a3bed-b211-46aa-889e-df7f32b5a774

📥 Commits

Reviewing files that changed from the base of the PR and between d7190e5 and fb0c535.

📒 Files selected for processing (2)

• skills/zenstack-querying/SKILL.md
• skills/zenstack-schema-modeling/SKILL.md