diff --git a/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/.openspec.yaml b/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/.openspec.yaml
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index 00000000..9a88f355
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+++ b/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/.openspec.yaml
@@ -0,0 +1,3 @@
+schema: spec-driven
+created: 2026-08-25
+skip_specs: true
diff --git a/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/proposal.md b/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/proposal.md
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+++ b/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/proposal.md
@@ -0,0 +1,41 @@
+## Why
+
+Found during a repository review session on 2026-08-25, after
+`retranslate-legacy-comments-to-english` (archived as
+`2026-08-25-retranslate-legacy-comments-to-english`) had already merged:
+`operations.apply.guidance` in `openspec/config.yaml` requires "A version
+bump in the affected package's package.json ... in sync with every
+externally visible behavior change." That change's own `proposal.md`
+explicitly flagged that `packages/core/src/agents/shared.ts`'s
+`commandInstruction()` changed behavior beyond a pure comment translation:
+the `plan`/`implement`/`review`/`status`/`cancel` branches now return
+English instruction text instead of Russian — this is the literal prompt
+prefix sent to CLI agents (Claude/Copilot/Codex/Gemini), a real runtime
+behavior change to `packages/core`'s output. `packages/core/package.json`
+was not bumped in that change, which is a gap against the repo's own
+versioning rule.
+
+## What Changes
+
+- Bump `packages/core/package.json` from `0.20.2` to `0.20.3` (patch: a
+  behavior change — the text of an existing function's output — without
+  changing `packages/core`'s public TypeScript API or the command/event
+  protocol).
+- No code change; this only reconciles the version number with behavior
+  that already shipped in `2026-08-25-retranslate-legacy-comments-to-english`.
+
+## Capabilities
+
+### New Capabilities
+
+(none)
+
+### Modified Capabilities
+
+(none; this change does not itself modify behavior — it corrects a version
+number that should have moved with a behavior change already shipped in a
+prior archived change)
+
+## Impact
+
+- `packages/core/package.json`
diff --git a/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/tasks.md b/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/tasks.md
new file mode 100644
index 00000000..b8c8d829
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+++ b/openspec/changes/archive/2026-08-25-bump-core-version-for-prompt-text-change/tasks.md
@@ -0,0 +1,10 @@
+## 1. Reconcile the version number
+
+- [x] 1.1 Bump `packages/core/package.json`'s `version` from `0.20.2` to
+  `0.20.3`.
+
+## 2. Verification
+
+- [x] 2.1 `npm run typecheck` passes workspace-wide.
+- [x] 2.2 `npm run test` passes workspace-wide.
+- [x] 2.3 Run `openspec change validate --strict bump-core-version-for-prompt-text-change`.
diff --git a/packages/core/package.json b/packages/core/package.json
index 03f1d382..ad21e502 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openspec-ui/core",
   "private": true,
-  "version": "0.20.2",
+  "version": "0.20.3",
   "type": "module",
   "main": "src/index.ts",
   "exports": {