deepseek-ai/deepseek-harness · error

model "${model}" does not declare image input

Error message

model "${model}" does not declare image input

What it means

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

Source

Thrown at packages/mcp/mcp-client/src/tools.ts:416

 */
async function resolveImageAdmission(ctx: Context, exec: ToolExecution): Promise<AttachmentStore> {
  const attachments = ctx.get('attachments')
  if (attachments === undefined) throw new Error('no attachment store is mounted')
  const routed = exec.agent?.session.requestHeader()?.config
  const provider = routed?.provider ?? exec.agent?.options.provider
  const model = routed?.model ?? exec.agent?.options.model
  const llm = ctx.get('llm')
  if (provider === undefined || model === undefined || llm === undefined) {
    throw new Error('the current model route could not be resolved')
  }
  let info: Awaited<ReturnType<typeof llm.resolveModelInfo>>
  try {
    info = await llm.resolveModelInfo(provider, model, exec.signal)
  } catch {
    throw new Error('the current model route could not be verified')
  }
  if (info.inputModalities === undefined || !info.inputModalities.includes('image')) {
    throw new Error(`model "${model}" does not declare image input`)
  }
  if (exec.signal.aborted) throw new Error('the tool call was canceled before image storage')
  return attachments
}

/** Stable diagnostic text for an image block that was not admitted. */
function imageDiagnostic(block: McpContentBlock, reason: string): string {
  const mediaType = block.mimeType ?? 'unknown media type'
  return `[image unavailable: ${mediaType}; ${reason}; raw image data remains available to programmatic callers]`
}

/**
 * Decode, preflight, and durably save one MCP result's ordered image batch.
 * Any refusal projects every image as text while retaining the canonical raw
 * value for programmatic callers.
 */
async function prepareImageProjection(
  ctx: Context,

View on GitHub (pinned to b150a551b8)

Solutions

1. Remove the image, or switch to a model that declares image input.

When it happens

Trigger: Thrown at packages/mcp/mcp-client/src/tools.ts:416 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/96f626a92f728067. Report an issue: GitHub.