Facing trouble in resuming conversation with kiro-cli chat --resume

[aayush749]

Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

macOS 26.2.0 (25C56)

Expected behaviour

To resume the conversation as usual

Actual behaviour

Getting this error-

Kiro is having trouble responding right now:
   0: Failed to send the request: An unknown error occurred: ValidationException
   1: An unknown error occurred: ValidationException
   2: unhandled error (ValidationException)
   3: service error
   4: unhandled error (ValidationException)
   5: Error { code: "ValidationException", message: "Improperly formed request.", aws_request_id: "e33cce2f-2eba-468d-9304-2f12394b4e79" }

Location:
   crates/chat-cli/src/cli/chat/mod.rs:1440

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

when run with RUST_BACKTRACE=full-

Kiro is having trouble responding right now:
   0: Failed to send the request: An unknown error occurred: ValidationException
   1: An unknown error occurred: ValidationException
   2: unhandled error (ValidationException)
   3: service error
   4: unhandled error (ValidationException)
   5: Error { code: "ValidationException", message: "Improperly formed request.", aws_request_id: "2ede5244-6b11-4ce6-b2f3-0af27c9ab48f" }

Location:
   crates/chat-cli/src/cli/chat/mod.rs:1440

   BACKTRACE
                                 5 frames hidden
   6: chat_cli::cli::chat::ChatSession::next::{{closure}}::h489c988e2c15f2b7
      at <unknown source file>:<unknown line>
   7: chat_cli::cli::chat::ChatSession::spawn::{{closure}}::h0d1b4f64b65c9fc2
      at <unknown source file>:<unknown line>
   8: chat_cli::cli::chat::ChatArgs::execute::{{closure}}::h2d9cf3201d338d67
      at <unknown source file>:<unknown line>
   9: chat_cli::cli::RootSubcommand::execute::{{closure}}::h8f6ba69b80c664ba
      at <unknown source file>:<unknown line>
  10: chat_cli::cli::Cli::execute::{{closure}}::he15d19c32283c8a1
      at <unknown source file>:<unknown line>
  11: tokio::runtime::park::CachedParkThread::block_on::hc140b0a5e9a2de9a
      at <unknown source file>:<unknown line>
  12: tokio::runtime::context::runtime::enter_runtime::ha6355807cc8d5b5b
      at <unknown source file>:<unknown line>
  13: tokio::runtime::runtime::Runtime::block_on::hc2491337fb6f189f
      at <unknown source file>:<unknown line>
  14: chat_cli::main::h2a3fc99d94f5fd9b
      at <unknown source file>:<unknown line>
  15: std::sys::backtrace::__rust_begin_short_backtrace::hfad22d3460983886
      at <unknown source file>:<unknown line>
  16: std::rt::lang_start::{{closure}}::h5abf1e3f62a4dfa7
      at <unknown source file>:<unknown line>
  17: std::rt::lang_start_internal::h1e9a2dfabf97dcbe
      at <unknown source file>:<unknown line>
  18: _main<unknown>
      at <unknown source file>:<unknown line>

Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.

Steps to reproduce

kiro-cli chat --resume in a conversation where I had done lot of work before.

Environment

[q-details]
version = "1.24.0"
hash = "0728b2464fed0b53e63abbb9ce12fa38a0542d69"
date = "2026-01-15T23:42:41.840104Z (12d ago)"
variant = "full"