Last Updated: 2026-03-08 Status: Active
Purpose: Fast orientation for where behavior lives in the Graphshell codebase.

See also:

• ARCHITECTURAL_OVERVIEW.md
• GRAPHSHELL_AS_BROWSER.md
• ../implementation_strategy/workbench/workbench_frame_tile_interaction_spec.md

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Graphshell runtime behavior is split across three boundaries:

1. Graph reducer authority (graph_app.rs) Semantic state and intent-driven mutation.
2. Workbench/tile authority (shell/desktop/ui + shell/desktop/workbench) Frame/tile arrangement, focus, and pane open/switch semantics.
3. Runtime rendering authority (render/mod.rs + compositor paths) Graph rendering, viewer rendering paths, and render-mode policy.

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• graph_app.rs GraphIntent handling, lifecycle transitions, persistence hooks, undo/redo foundations.

• render/mod.rs
  Graph view rendering and interaction, camera commands, zoom/fit behavior.

• shell/desktop/ui/gui.rs
  Frame-loop orchestration and workbench-authority intent interception.

• shell/desktop/ui/gui_frame.rs
  Per-frame execution sequencing and panel orchestration.

• shell/desktop/workbench/tile_view_ops.rs
  Tile open/focus/split helpers and tile-tree structural operations.

• shell/desktop/workbench/tile_behavior.rs
  Tile-level user interactions and pending-open/split behavior.

• shell/desktop/workbench/tile_render_pass.rs
  Tile render dispatch for graph/node/tool pane paths.

• shell/desktop/workbench/tile_post_render.rs
  Post-render tile reconciliation and deferred operations.

• shell/desktop/workbench/tile_runtime.rs
  Tile runtime state handling and viewer/runtime wiring helpers.

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• shell/desktop/lifecycle/*
  Webview lifecycle reconciliation and runtime mapping helpers.

• shell/desktop/runtime/protocols/* Protocol routing and in-app protocol handlers.

• persistence/* and shell/desktop/ui/persistence_ops.rs
  Snapshot/log persistence and save/load operations.

• registries/*
  Registry/domain contracts and runtime capability wiring.

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• Node open/split/focus issue → shell/desktop/ui/gui.rs, shell/desktop/ui/gui_frame.rs, tile_view_ops.rs, tile_behavior.rs
• Graph camera/zoom issue → render/mod.rs, registries/domain/layout/canvas.rs
• Viewer composition/z-order issue → tile_render_pass.rs, tile_compositor.rs
• Lifecycle mismatch issue → graph_app.rs, shell/desktop/lifecycle/*
• Persistence restore/routing mismatch → services/persistence/mod.rs, shell/desktop/ui/persistence_ops.rs, graph_app.rs

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• Keep graph-authority mutations in reducer paths.
• Keep tile/frame structure mutations in workbench-authority paths.
• Keep render-order fixes aligned with composited pass contract.
• Prefer updating active strategy docs when behavior contracts change.