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Charley Cunningham cab607befb Centralize context update diffing logic (#11807 )

## Summary
This PR centralizes model-visible state diffing for turn context updates
into one module, while keeping existing behavior and call sites stable.

### What changed
- Added `core/src/context_updates.rs` with the consolidated diffing
logic for:
  - environment context updates
  - permissions/policy updates
  - collaboration mode updates
  - model-instruction switch updates
  - personality updates
- Added `BuildSettingsUpdateItemsParams` so required dependencies are
passed explicitly.
- Updated `Session::build_settings_update_items` in `core/src/codex.rs`
to delegate to the centralized module.
- Reused the same centralized `personality_message_for` helper from
initial-context assembly to avoid duplicated logic.
- Registered the new module in `core/src/lib.rs`.

## Why
This is a minimal, shippable step toward the model-visible-state design:
all state diff decisions for turn-context update items now live in one
place, improving reviewability and reducing drift risk without expanding
scope.

## Behavior
- Intended to be behavior-preserving.
- No protocol/schema changes.
- No call-site behavior changes beyond routing through the new
centralized logic.

## Testing
Ran targeted tests in this worktree:
- `cargo test -p codex-core
build_settings_update_items_emits_environment_item_for_network_changes`
- `cargo test -p codex-core collaboration_instructions --test all`

Both passed.

## Codex author
`codex resume 019c540f-3951-7352-a3fa-6f07b834d4ce`

cab607befb · 2026-02-17 09:21:44 -08:00

History

src

Centralize context update diffing logic (#11807 )

2026-02-17 09:21:44 -08:00

templates

[apps] Fix app mention syntax. (#11894 )

2026-02-16 22:01:49 +00:00

tests

fix(core) exec_policy parsing fixes (#11951 )

2026-02-16 23:11:59 -08:00

BUILD.bazel

Add feature-gated freeform js_repl core runtime (#10674 )

2026-02-11 12:05:02 -08:00

build.rs

fix: System skills marker includes nested folders recursively (#10350 )

2026-02-01 18:17:32 -08:00

Cargo.toml

core: snapshot tests for compaction requests, post-compaction layout, some additional compaction tests (#11487 )

2026-02-14 19:57:10 -08:00

config.schema.json

chore: rename collab feature flag key to multi_agent (#11918 )

2026-02-16 15:28:31 +00:00

gpt_5_1_prompt.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

gpt_5_2_prompt.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

gpt_5_codex_prompt.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

gpt-5.1-codex-max_prompt.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

gpt-5.2-codex_prompt.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

hierarchical_agents_message.md

Add hierarchical agent prompt (#8996 )

2026-01-09 13:47:37 -08:00

models.json

Update models.json (#11376 )

2026-02-10 17:25:35 -08:00

prompt_with_apply_patch_instructions.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

prompt.md

Assemble sandbox/approval/network prompts dynamically (#8961 )

2026-01-12 23:12:59 +00:00

README.md

[feat] add seatbelt permission files (#11639 )

2026-02-12 23:30:22 +00:00

review_prompt.md

docs: Fix markdown list item spacing in codex-rs/core/review_prompt.md (#4144 )

2025-10-30 17:39:21 -07:00

README.md

codex-core

This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.

Dependencies

Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this support matrix is:

macOS

Expects /usr/bin/sandbox-exec to be present.

When using the workspace-write sandbox policy, the Seatbelt profile allows writes under the configured writable roots while keeping .git (directory or pointer file), the resolved gitdir: target, and .codex read-only.

Network access and filesystem read/write roots are controlled by SandboxPolicy. Seatbelt consumes the resolved policy and enforces it.

Seatbelt also supports macOS permission-profile extensions layered on top of SandboxPolicy:

no extension profile provided: keeps legacy default preferences read access (user-preference-read).
extension profile provided with no macos_preferences grant: does not add preferences access clauses.
macos_preferences = "readonly": enables cfprefs read clauses and user-preference-read.
macos_preferences = "readwrite": includes readonly clauses plus user-preference-write and cfprefs shm write clauses.
macos_automation = true: enables broad Apple Events send permissions.
macos_automation = ["com.apple.Notes", ...]: enables Apple Events send only to listed bundle IDs.
macos_accessibility = true: enables com.apple.axserver mach lookup.
macos_calendar = true: enables com.apple.CalendarAgent mach lookup.

Linux

Expects the binary containing codex-core to run the equivalent of codex sandbox linux (legacy alias: codex debug landlock) when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.

All Platforms

Expects the binary containing codex-core to simulate the virtual apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the codex-arg0 crate for details.