cassady/docs/troubleshooting.md

Troubleshooting

Use cass check first for configuration problems. It validates files, provider/model references, and API key availability.

Missing active API key

Symptom: cass check reports that an environment variable is not set, or chat startup says the API key is not available.

Likely cause: the active provider's api_key is an env reference such as "$OPENAI_API_KEY", but that variable is not set in the current shell.

Fix on macOS/Linux:

export OPENAI_API_KEY=...
cass check
cass

Fix in PowerShell:

$env:OPENAI_API_KEY = "..."
cass check
cass

Invalid API key reference

Symptom: the key is not resolved the way you expect.

Likely cause: Cassady only treats strings that start with $ as environment references. It does not expand partial strings or ${NAME} syntax.

Fix:

{ "api_key": "$OPENAI_API_KEY" }

Provider URL unreachable

Symptom: setup model discovery fails or a turn reports a provider error.

Likely causes:

• wrong base_url;
• network or proxy problem;
• provider outage;
• provider requires a different OpenAI-compatible path.

Fix: verify the base URL in providers.json, retry setup, or enter the model id manually if only /models discovery is failing.

/models discovery fails

Symptom: setup cannot fetch models.

Likely cause: some providers do not expose GET /models, require extra permissions, or return a non-standard shape.

Fix: choose retry if the failure is temporary; otherwise enter the model id manually. Then run cass check.

Unsupported or invalid model id

Symptom: chat starts but the provider rejects the model.

Likely cause: the model id in models.json or config.json is not valid for the provider.

Fix: update the model id with cass setup, edit models.json, or launch with:

cass --model MODEL_ID

Then verify with a small prompt.

Rate limit or authentication errors

Symptom: the assistant says the provider returned an error.

Likely cause: provider-side authentication, quota, billing, or rate limit.

Fix: confirm the API key, provider account status, selected model, and provider dashboard. Cassady forwards provider failures into the chat but cannot resolve account-level issues.

Invalid JSON or unknown config fields

Symptom: cass check reports a parsing or schema error for config.json, providers.json, or models.json.

Likely cause: invalid JSON, comments, trailing commas, misspelled fields, or a field in the wrong file.

Fix: remove comments/trailing commas, compare against Configuration, and run:

cass check

Workspace access denied

Symptom: tool output says a path escapes allowed roots or workspace-edit root.

Likely cause: the active mode is read-only or workspace-edit, and the path resolves outside the launch cwd or bundled docs.

Fix: start from the intended project directory, pass --cwd PATH, or intentionally use --full-access when broad filesystem access is needed.

Shell unavailable or waiting for approval

Symptom: shell is denied or Cassady asks for approval.

Rules:

• read-only: shell is unavailable.
• workspace-edit: shell requires approval.
• full-access: shell is allowed by policy.

Fix: switch mode with Shift-Tab while idle or launch with the desired access flag.

Shell command failed or timed out

Symptom: shell result includes stderr, non-zero exit code, or timeout.

Likely cause: the command itself failed, the working directory is wrong, dependencies are missing, or the timeout was too short.

Fix: inspect stdout/stderr, verify cwd in /status, and ask Cassady to rerun the smallest relevant command.

Exact-text edit failed

Symptom: edit reports old_text not found, old_text is not unique, or overlapping edits.

Likely cause: the file changed, whitespace differs, line endings differ, or the replacement text is too broad.

Fix: ask Cassady to re-read the file and retry with a smaller unique old_text. For repeated blocks, include nearby unique context.

Binary, large, or unsupported files

Symptom: read/edit output is confusing or fails.

Likely cause: the file is binary, too large for useful display, or not valid UTF-8 for text edits.

Fix: ask Cassady to list metadata or use project-specific tools through approved shell commands. Avoid direct text edits on binary files.

CRLF or line-ending confusion

Symptom: exact-text edits fail even when the text appears to match.

Likely cause: Windows CRLF line endings or invisible whitespace differences.

Fix: re-read the exact target region and preserve the line endings in old_text, or use a smaller unique snippet.

Terminal rendering problems

Symptom: the UI appears garbled or keys do not behave as expected.

Likely cause: unsupported terminal features, redirected stdin/stdout, or platform-specific terminal behavior.

Fix: run Cassady in an interactive terminal. Use cass check for non-interactive validation. Windows runtime polish is planned for a later release.

Setup says it is interactive

Symptom: cass setup fails with setup is interactive; run cass setup in a terminal.

Likely cause: stdin is not a terminal.

Fix: run setup directly in a terminal, not through a non-interactive script or redirected input.