diff --git a/packages/durable/CHANGELOG.md b/packages/durable/CHANGELOG.md
index 88683db4b..9ef9732d9 100644
--- a/packages/durable/CHANGELOG.md
+++ b/packages/durable/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- `Tx.submission(id)` reads a committed submission record by ID, so a tool can find the entries of its run's inputs (`pi.live.run.inputs`) without scanning the transcript.
+
 ### Changed
 
 - `SqliteStorage.commit()` costs a few SQL statements per call instead of about eight per batch: it reads the check state of all batches up front, checks them in memory, and writes the accepted batches per table in multi-row statements (rows as one JSON array parameter; rows with much text bound column by column), so a group commit over a remote SQLite takes a few round trips, not hundreds. A stored document record that cannot be parsed now rejects the call as a storage failure instead of refusing the batch.
diff --git a/packages/durable/docs/spec.md b/packages/durable/docs/spec.md
index 509dd29a6..fcae714a3 100644
--- a/packages/durable/docs/spec.md
+++ b/packages/durable/docs/spec.md
@@ -1439,6 +1439,7 @@ interface Tx {
   scanConversations(query: ConversationQuery, limit: number, cursor?: Cursor): Promise<Page<ConversationRecord, Cursor>>;
   scanEntries(query: EntryQuery, limit: number, cursor?: Cursor): Promise<Page<EntryRecord, Cursor>>;
   scanTasks(query: TaskQuery, limit: number, cursor?: Cursor): Promise<Page<TaskRecord<JsonValue, JsonValue, JsonValue>, Cursor>>;
+  submission(id: SubmissionId): Promise<SubmissionRecord | undefined>;
   submissionByRequest(conversationId: ConversationId, requestId: string): Promise<SubmissionRecord | undefined>;
 
   createConversation(options: { readonly ownership: ConversationOwnership }): Promise<ConversationRecord>;
diff --git a/packages/durable/src/session/transaction.ts b/packages/durable/src/session/transaction.ts
index e6a18e781..534807a84 100644
--- a/packages/durable/src/session/transaction.ts
+++ b/packages/durable/src/session/transaction.ts
@@ -338,7 +338,7 @@ export class Transaction implements Tx {
 		return this.#read("scanTasks", () => this.#host.storage.scanTasks(query, limit, cursor, this.#context));
 	}
 
-	/** Internal: committed submission record. */
+	/** Committed submission record. */
 	submission(id: SubmissionId): Promise<SubmissionRecord | undefined> {
 		return this.#read("submission", () => this.#host.storage.submission(id, this.#context));
 	}
diff --git a/packages/durable/src/types.ts b/packages/durable/src/types.ts
index c59827ce5..583c02d9f 100644
--- a/packages/durable/src/types.ts
+++ b/packages/durable/src/types.ts
@@ -1007,6 +1007,8 @@ export interface Tx {
 		limit: number,
 		cursor?: Cursor,
 	): Promise<Page<TaskRecord<JsonValue, JsonValue, JsonValue>, Cursor>>;
+	/** Committed submission record, such as one of `pi.live.run.inputs`; a placed input's `entry` is its transcript entry. */
+	submission(id: SubmissionId): Promise<SubmissionRecord | undefined>;
 	/** Committed submission with a conversation-scoped request ID. */
 	submissionByRequest(conversationId: ConversationId, requestId: string): Promise<SubmissionRecord | undefined>;
 
diff --git a/packages/durable/test/harness-submit-in-commit.test.ts b/packages/durable/test/harness-submit-in-commit.test.ts
index 9f4e08d9e..1edb9e422 100644
--- a/packages/durable/test/harness-submit-in-commit.test.ts
+++ b/packages/durable/test/harness-submit-in-commit.test.ts
@@ -282,6 +282,22 @@ describe("submit inside the caller's commit", () => {
 		await harness.close(context);
 	});
 
+	it("reads a submission by ID in a commit, with the entry its input was placed at", async () => {
+		const setup = chatSetup();
+		setup.faux.setResponses([fauxAssistantMessage([fauxText("answer")])]);
+		const { harness, root } = await openChat(new ControlledStorage(), setup);
+		const id = await harness.commit((tx) => root.submit(tx, { type: "input", content: "hi" }), context);
+		await settledStatus(harness, id);
+		const found = await harness.commit(async (tx) => {
+			const submission = await tx.submission(id);
+			const entry = submission?.entry === undefined ? undefined : await tx.entry(submission.entry);
+			return { status: submission?.status, conversationId: entry?.conversationId, kind: entry?.kind };
+		}, context);
+		expect(found).toEqual({ status: "done", conversationId: root.id, kind: "pi.user" });
+		expect(await harness.commit((tx) => tx.submission(999_999 as SubmissionId), context)).toBeUndefined();
+		await harness.close(context);
+	});
+
 	// #11149
 	it("queues a model-visible write while busy and places it at the next boundary", async () => {
 		const setup = chatSetup();