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Daily Log: 2026-07-10 ​

A focused architecture design day on the fractal project. The session centered on resolving the typed query-parameter combinator design — specifically, whether query params should follow the path-param discharge model or be leaf-level schema carriers. Design work dominated; no code changes committed, but substantial design ground was covered via multi-agent investigation.

Sessions and Activity ​

fractal ​

One primary session at 14:27:37 — a handoff implementation request followed by multi-stage agent work to verify repository state, audit the roadmap, and design the query combinator API.

Subtasks completed:

  1. Verify repo state — Agent audit of git status, branch state, test suite (248 tests passing), recent commits, and design documentation state. Identified the design backlog from a 2026-07-10 session audit and confirmed master branch is clean except for one untracked artifact.

  2. Read roadmap handoff — Deep analysis of the typed query(...) combinator task, the highest-priority item on the fractal roadmap. Extracted roadmap specification, surrounding context, existing handler model patterns, the discharge model mechanics, and the open design question: should query params ride req.ctx and the discharge model (parallel to path params), or be read-not-discharged at the leaf?

  3. Design query combinator — Agent design work proposed the pragmatic frame: query params as leaf-level schema-carriers (like the existing validated for body), not as ctx-discharge requirements (like param for path). The design resolves the asymmetry (path params gate routing; query params don't) by using the same MethodsMeta.schemas seam that body validation already uses for projection into OpenAPI and generated client signatures.

Design decisions reached:

  • Query params should NOT thread through the discharge model (Omit).
  • Query should be a leaf constructor in @rhi-zone/fractal-http, mirroring validated 1:1 in shape.
  • Schema (Standard Schema V1) types the query-read function's first argument.
  • Composition with path params remains orthogonal.
  • No new meta tag; no change to routing or pattern matching (query does not gate routing).
  • Projection via existing MethodsMeta.schemas seam (same as body validation).

Tangent discussion: A user correction flagged a semantic slip — raw query strings are already typed (as strings); the design concern is transformation/coercion to structured types, not initial typing.

Token Usage ​

ProjectSessionsOutput TokensCache ReadInput Tokens
fractal1variable—~33k + 45k + 69k

(Three agent tasks ran sequentially with large outputs; final token counts not aggregated in standard format. Cache read operations appeared in later agent runs.)

Observations ​

  1. Design-heavy day. No implementation work, but the query-combinator design reached a significant milestone — the open design question was decisively resolved via comparative analysis (discharge model vs. leaf schema-carrier).

  2. Agent-driven investigation. Multi-stage agent work (verify → read → design) provided thorough grounding: repo state, roadmap context, and pragmatic design framing. This is the session pattern for high-stakes design decisions.

  3. Optics-direction framing visible. Toward the end of the session, discussion surfaced the broader optics-algebra direction (from docs/design/optics-direction.md), hinting at longer-term architectural intent: composition law optic ∘ optic = optic, concrete struct encoding over closures, bidirectional bindings. The query design sits within that frame.

  4. Design backlog consolidated. The agent audit identified a design backlog from the same 2026-07-10 audit (10 items, priority-ordered in TODO.md), with override-authoring form marked as settled. This is the decision hygiene the project is tracking.

Projects Touched ​

  • fractal — Architecture design: typed query-parameter combinator, discharge model vs. leaf schema-carrier framing, projection integration strategy.

Next Steps (inferred) ​

  1. Implement query combinator — Code the leaf-schema-carrier design into packages/core, packages/http, packages/openapi, packages/codegen.
  2. Test and verify — Ensure end-to-end projection (OpenAPI + codegen) works; write tests for composition with path params.
  3. Address remaining backlog — Resume work on readOnly vs safe tag naming, openWorld tag semantics, codegen hardening, etc., as documented in TODO.md.