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feat(coding-agent): add durable subagent state storage #120

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Merged
Issacboy123 merged 2 commits into from
Aug 28, 2026
Merged

feat(coding-agent): add durable subagent state storage #120

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ccd438b
feat(coding-agent): add persistent subagent foundations
Issacboy123 Aug 20, 2026
3b34cb7
fix(coding-agent): keep header persistence internal
Issacboy123 Aug 20, 2026
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27 changes: 27 additions & 0 deletions packages/coding-agent/src/core/session-manager.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import {
closeSync,
createReadStream,
existsSync,
fsyncSync,
mkdirSync,
openSync,
readdirSync,
Expand Down Expand Up @@ -227,6 +228,8 @@ function createSessionId(): string {
return uuidv7();
}

const PERSIST_SESSION_HEADER = Symbol("persistSessionHeader");

export function assertValidSessionId(id: string): void {
if (!/^[A-Za-z0-9](?:[A-Za-z0-9._-]*[A-Za-z0-9])?$/.test(id)) {
throw new Error(
Expand Down Expand Up @@ -1034,6 +1037,25 @@ export class SessionManager {
return this.sessionFile;
}

/** Persist a newly created session header before admitting dependent work. */
[PERSIST_SESSION_HEADER](): void {
if (!this.persist || !this.sessionFile) {
throw new Error("Cannot persist an in-memory session header");
}
if (this.fileEntries.length !== 1 || this.fileEntries[0]?.type !== "session") {
throw new Error("Session header must be persisted before appending entries");
}

const fd = openSync(this.sessionFile, "wx");
try {
writeFileSync(fd, `${JSON.stringify(this.fileEntries[0])}\n`);
fsyncSync(fd);
} finally {
closeSync(fd);
}
this.flushed = true;
}

_persist(entry: SessionEntry): void {
if (!this.persist || !this.sessionFile) return;

Expand Down Expand Up @@ -1787,3 +1809,8 @@ export class SessionManager {
}
}
}

/** Internal seam for durably admitting a newly created dependent session. */
export function persistSessionHeader(sessionManager: SessionManager): void {
sessionManager[PERSIST_SESSION_HEADER]();
}
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