deepseek-ai/deepseek-harness · error · Error

cannot attach session '${sessionId}' to workspace '${this.re

Error message

cannot attach session '${sessionId}' to workspace '${this.record.path}': its stored header carries no cwd to validate against

What it means

Error "cannot attach session '${sessionId}' to workspace '${this.record.path}': its stored header carries no cwd to validate against" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/workspace/workspace/src/entity.ts:117

  }

  get sessionIds(): readonly SessionId[] {
    return this.record.sessionIds.filter(id => this.host.sessionPath(id) === this.record.path)
  }

  async setTitle(title: string): Promise<void> {
    await this.mutate(record => ({ ...record, title }))
  }

  async attachSession(sessionId: SessionId): Promise<void> {
    // Validation is skipped when the settled snapshot already accounts the
    // id: the cwd fact was checked when it first attached and both inputs
    // (stored header cwd, workspace path) are immutable. Membership itself is
    // decided on the write chain inside `mutate`, never on this snapshot.
    if (!this.record.sessionIds.includes(sessionId)) {
      const header = await this.host.readSessionHeader(sessionId)
      if (header.cwd === undefined) {
        throw new Error(
          `cannot attach session '${sessionId}' to workspace '${this.record.path}': `
          + 'its stored header carries no cwd to validate against',
        )
      }
      let cwd: string
      try {
        cwd = await realpathNormalize(header.cwd)
      } catch (error) {
        throw new Error(
          `cannot attach session '${sessionId}' to workspace '${this.record.path}': `
          + `its cwd '${header.cwd}' does not resolve, so it cannot be validated`,
          { cause: error },
        )
      }
      if (!(await stat(cwd)).isDirectory()) {
        throw new Error(
          `cannot attach session '${sessionId}' to workspace '${this.record.path}': `
          + `its cwd '${header.cwd}' is not a directory`,

View on GitHub (pinned to b150a551b8)

Solutions

1. Re-create the session so its stored header records a cwd, or repair the persisted session header before attaching it to a workspace.

When it happens

Trigger: Thrown at packages/workspace/workspace/src/entity.ts:117 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/f879aa1667c31c86. Report an issue: GitHub.