mastra-ai/mastra · error · HTTPException

Failed to resolve updated agent

Error message

Failed to resolve updated agent

What it means

HTTP 500 thrown at the end of the update handler when `agentsStore.getByIdResolved(storedAgentId, { status: 'draft' })` returns null after the update and cache-clear completed. The handler returns the resolved (thin record + version config) agent, so a null here means the updated record can't be re-read — an inconsistent or stale storage state, not a client input problem.

Source

Thrown at packages/server/src/server/handlers/stored-agents.ts:984

        const latestVersion = versions[0];
        if (latestVersion) {
          await agentsStore.update({
            id: storedAgentId,
            activeVersionId: latestVersion.id,
          });
        }
      }

      // Clear the cached agent instance so the next request gets the updated config
      const editor = mastra.getEditor();
      if (editor) {
        editor.agent.clearCache(storedAgentId);
      }

      // Return the resolved agent with the latest version
      const resolved = await agentsStore.getByIdResolved(storedAgentId, { status: 'draft' });
      if (!resolved) {
        throw new HTTPException(500, { message: 'Failed to resolve updated agent' });
      }

      return enrichOrStripFavorites(mastra, requestContext, 'agent', resolved);
    } catch (error) {
      return handleError(error, 'Error updating stored agent');
    }
  },
});

/**
 * DELETE /stored/agents/:storedAgentId - Delete a stored agent
 */
export const DELETE_STORED_AGENT_ROUTE = createRoute({
  method: 'DELETE',
  path: '/stored/agents/:storedAgentId',
  responseType: 'json',
  pathParamSchema: storedAgentIdPathParams,
  responseSchema: deleteStoredAgentResponseSchema,

View on GitHub (pinned to 75dd419e61)

Solutions

1. Upgrade the storage adapter / run migrations so getByIdResolved resolves drafts correctly
2. Re-read the agent via the plain get endpoint to check whether the record exists at all; if the agent was deleted concurrently, recreate or surface 404 to the user
3. Retry the update once; if it recurs, inspect the agents and version rows for the missing draft version
4. If using a custom adapter, implement getByIdResolved to fall back from activeVersionId to the latest draft version

Example fix

// before
const resolved = await agentsStore.getByIdResolved(storedAgentId, { status: 'draft' });
if (!resolved) throw new HTTPException(500, { message: 'Failed to resolve updated agent' });

// after (caller-side guard)
const updated = await updateStoredAgent(id, patch).catch(() => null);
const resolved = updated ?? (await getStoredAgent(id)); // fall back to thin record

const updated = await updateStoredAgent(id, patch);
const check = await getStoredAgent(id);
if (!check) console.warn('updated agent cannot be re-read; storage resolution is inconsistent');

function isAgentRecord(a: unknown): a is { id: string; name: string } {
  return !!a && typeof a === 'object' && 'id' in a && 'name' in a;
}

try {
  return await updateStoredAgent(id, patch);
} catch (e) {
  if (isHttpError(e) && e.status === 500 && /Failed to resolve updated agent/.test(e.message)) {
    const thin = await getStoredAgent(id); // fall back to thin record
    if (thin) return thin;
  }
  throw e;
}

When it happens

Trigger: Update request where the write succeeded (or partially succeeded) but draft resolution returns nothing — unmigrated version tables, read-after-write lag in the adapter, a version collapse that left no active draft, or a custom getByIdResolved that can't resolve the agent's versions.

Common situations: Custom/older storage adapters without full resolved-read support; editor cache cleared but underlying version rows missing; concurrent update/delete racing the final read; data manually edited or corrupted in the database.

Related errors

• Failed to resolve created agent
• Failed to resolve created skill
• AcpAgent does not support resuming suspended generate calls
• AcpAgent does not support resuming suspended stream calls
• ACP prompt stopped before completing: ${response.stopReason}

AI-assisted analysis of mastra-ai/mastra@75dd419e61 (2026-08-30). Data as JSON: /api/errors/3cce7c4f86d7a5f1. Report an issue: GitHub.