deepseek-ai/deepseek-harness · error · Error

invalid seed event at index ${index}: ${error instanceof Err

Error message

invalid seed event at index ${index}: ${error instanceof Error ? error.message : 'invalid surface metadata'}

What it means

Error "invalid seed event at index ${index}: ${error instanceof Error ? error.message : 'invalid surface metadata'}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/core/session/src/index.ts:534

      for (const [index, source] of seed.entries()) {
        // The seed is a persistence/replay boundary: validate and detach the
        // complete event in one lossless-JSON pass.
        const snapshot = mode === 'restore' ? source : snapshotJsonValue(source)
        if (snapshot === undefined) {
          throw new Error(`seed event at index ${index} is not losslessly JSON-serializable`)
        }
        assertSessionEventEnvelope(snapshot, index)
        assertSupportedRequestHeader(snapshot.type, snapshot.data, `seed event at index ${index}`)
        if (snapshot.seq !== index) {
          throw new Error(`seed event at index ${index} has seq ${snapshot.seq} (expected ${index}); seed must be contiguous from 0`)
        }
        // A seed is accepted incrementally through the same transition as a
        // live append and a full-log fold. The candidate is planned before it
        // enters `log`, so a failure cannot partially mutate the surface.
        try {
          this.surfaceManager.validateNext(snapshot)
        } catch (error: unknown) {
          throw new Error(`invalid seed event at index ${index}: ${error instanceof Error ? error.message : 'invalid surface metadata'}`)
        }
        this.log.push(mode === 'restore' ? freezeRestoredObject(snapshot) : deepFreeze(snapshot))
      }
    }
    this.firstLiveSeq = this.log.length
    this.header = restoredHeader ?? snapshotSessionHeader(id, header)
    // Appended here so the marker is already in `events` when a backend
    // captures the creation seed: no load-time write. Re-marking is skipped
    // because a cold session is resumed on first touch, so repeatedly opening
    // one must not grow its log per open.
    if (seed !== undefined && this.log.at(-1)?.type !== 'session/end-seed') {
      this.append('session/end-seed', {})
    }
  }

  /** Cached immutable public snapshot of the private append-only log. */
  private eventsSnapshot: readonly SessionEvent[] | undefined

View on GitHub (pinned to b150a551b8)

Solutions

1. Fix the seed event surface metadata per the reported error.

When it happens

Trigger: Thrown at packages/core/session/src/index.ts:534 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/8b14fd4b3c421ab0. Report an issue: GitHub.