deepseek-ai/deepseek-harness · error

attachment-error

attachment-error

Error message

Model "${current.model}" does not support image input.

What it means

Error "Model "${current.model}" does not support image input." thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:2389

          })
        }
        const resolved = await turnAgentFor<{ accepted: true }>(request, sessionId)
        if ('refused' in resolved) return resolved.refused
        const agent = resolved.agent
        // Request identity and optional browser zone ride the exact durable user message.
        const source: MessageSource = {
          kind: 'user',
          rpcId: request.rpcId,
          ...(canonicalTimeZone === undefined ? {} : { clientTimeZone: canonicalTimeZone }),
        }
        const hasImage = content.some(part => part.type === 'image')
        const admit = async (): Promise<RpcResponse<{ accepted: true }>> => {
          try {
            if (hasImage) {
              const current = selectionFor(agent).current
              const modelInfo = await ctx.llm.resolveModelInfo(current.provider, current.model)
              if (modelInfo.inputModalities !== undefined && !modelInfo.inputModalities.includes('image')) {
                return err(request, {
                  code: 'attachment-error',
                  message: `Model "${current.model}" does not support image input.`,
                  details: { reason: 'MODEL_DOES_NOT_SUPPORT_IMAGES' },
                })
              }
            }
            const durable = await durablePromptContent(ctx, content)
            const message: UserMessage = createUserMessage({ content: durable, source })
            if (mode === 'steer') agent.steer(message)
            else agent.followup(message)
          } catch (error: unknown) {
            if (error instanceof AttachmentError) {
              return err(request, {
                code: 'attachment-error',
                message: error.message,
                details: { reason: error.code },
              })
            }

View on GitHub (pinned to b150a551b8)

Solutions

1. Remove image inputs from the prompt, or switch the session to a model that supports image input.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:2389 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/c96f7fd8666e62a0. Report an issue: GitHub.