* fix(core): apply OpenAI prompt cache settings to request payloads
Set prompt_cache_key using agent and conversation context on both Responses and Chat Completions request builders, and enable 24h retention only for supported OpenAI models while excluding OpenRouter paths.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(core): prefix prompt cache key with letta tag
Add a `letta:` prefix to generated OpenAI prompt_cache_key values so cache-related entries are easier to identify in provider-side logs and diagnostics.
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Co-Authored-By: Letta <noreply@letta.com>
* add integration test
* skip test
---------
Co-authored-by: Letta <noreply@letta.com>
Co-authored-by: Ari Webb <ari@letta.com>
502s and upstream connection errors (envoy proxy failures) from ChatGPT
were not being retried. This classifies them as LLMConnectionError (retryable)
in both the streaming and non-streaming paths, and adds retry handling in
the non-streaming HTTPStatusError handler so 502s get the same exponential
backoff treatment as transport-level connection drops.
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Avoid failing message-list endpoints when historical send_message tool calls are missing the expected message argument by logging and skipping malformed entries during conversion.
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Co-authored-by: Letta <noreply@letta.com>
The "Experience the new ADE" page was outdated and no longer useful.
Root path now redirects to /docs (FastAPI Swagger UI) instead.
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Co-authored-by: Letta <noreply@letta.com>
LLMError exceptions are already properly formatted errors that should
propagate directly. Without this check, they get unnecessarily wrapped
by handle_llm_error, losing their original error information.
* debug: log statement_timeout + connection pid on every session checkout
Temporary instrumentation to diagnose why some PlanetScale connections
have statement_timeout=5s while others have 0 (disabled).
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* debug: log statement_timeout on every checkout, not just non-zero
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* fix: rollback implicit transaction from debug query
The SELECT implicitly begins a transaction, causing "A transaction is
already begun" errors for code that calls session.begin() explicitly.
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---------
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* new prompts for sliding window and all compaction + defaults to corresponding prompt
* regenerate api spec
---------
Co-authored-by: Amy Guan <amy@letta.com>
fix: update system prompt metadata label from "Memory blocks were last modified" to "System prompt last recompiled"
When git-based memory is enabled, there are no memory blocks, so the label
"Memory blocks were last modified" is inaccurate. Changed to
"System prompt last recompiled" which accurately reflects the timestamp meaning.
Fixes#9476🐾 Generated with [Letta Code](https://letta.com)
Co-authored-by: letta-code <248085862+letta-code@users.noreply.github.com>
Co-authored-by: Letta <noreply@letta.com>
* fix(core): catch bare openai.APIError in handle_llm_error fallthrough
openai.APIError raised during streaming (e.g. OpenRouter credit
exhaustion) is not an APIStatusError, so it skipped the catch-all
at the end and fell through to LLMError("Unhandled"). Now bare
APIErrors that aren't context window overflows are mapped to
LLMBadRequestError.
Datadog: https://us5.datadoghq.com/error-tracking/issue/7a2c356c-0849-11f1-be66-da7ad0900000🐾 Generated with [Letta Code](https://letta.com)
Co-Authored-By: Letta <noreply@letta.com>
* feat(core): add LLMInsufficientCreditsError for BYOK credit exhaustion
Adds dedicated error type for insufficient credits/quota across all
providers (OpenAI, Anthropic, Google). Returns HTTP 402 with
BYOK-aware messaging instead of generic 400.
- New LLMInsufficientCreditsError class and PAYMENT_REQUIRED ErrorCode
- is_insufficient_credits_message() helper detecting credit/quota strings
- All 3 provider clients detect 402 status + credit keywords
- FastAPI handler returns 402 with "your API key" vs generic messaging
- 5 new parametrized tests covering OpenRouter, OpenAI, and negative case
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---------
Co-authored-by: Letta <noreply@letta.com>
* feat: add template rollback endpoint [LET-7423]
Adds POST /v1/templates/:template_name/rollback endpoint to restore templates to previous versions.
Key features:
- Rollback to any numbered version (1, 2, 3, etc.) or "latest"
- Auto-saves unsaved changes before rollback to prevent data loss
- Validates input (rejects "current"/"dev" as target versions)
- Preserves entity IDs and relationships across rollback
- Uses project context from X-Project header (no project_id in path)
Implementation includes:
- API contract in templatesContract.ts
- Handler in templatesRouter.ts with comprehensive error handling
- 9 E2E tests covering functionality and edge cases
- Updated stainless.yml for SDK generation
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* chore test
* fix: add X-Project header to rollback endpoint tests
The rollback endpoint uses project context from X-Project header instead of URL path.
Updated all rollback test calls to include the X-Project header with testProject value.
This follows the no-project-in-path pattern for template endpoints.
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Co-Authored-By: Letta <noreply@letta.com>
* feat: support both URL patterns for rollback endpoint
Added dual URL pattern support for rollback endpoint:
- `/v1/templates/:project_id/:template_name/rollback` (with project in path)
- `/v1/templates/:template_name/rollback` (NoProject, uses X-Project header)
Backend supports both patterns, but Stainless only exposes the cleaner NoProject version for SDKs.
Key changes:
- Fixed "rollback to latest" bug by resolving target version BEFORE auto-saving
- NoProject route is exported first to ensure correct route matching order
- Updated tests to use project_id in path for better compatibility
- All 8 rollback tests passing
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* bump
* bump
* bump
---------
Co-authored-by: Letta <noreply@letta.com>
- Map httpx.ReadError/WriteError/ConnectError to LLMConnectionError in
handle_llm_error so Temporal correctly classifies them as retryable
(previously fell through to generic non-retryable LLMError)
- Add client-level retry with exponential backoff (up to 3 attempts) on
request_async and stream_async for transient transport errors
- Stream retry is guarded by has_yielded flag to avoid corrupting
partial responses already consumed by the caller
get_content() was only setting signature on ReasoningContent items.
When Gemini returns a function call with thought_signature but no
ReasoningContent (e.g. include_thoughts=False), the signature was
stored on self.thinking_signature but never attached to TextContent.
This caused "missing thought_signature in functionCall parts" errors
when the message was echoed back to Gemini on the next turn.
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Co-authored-by: Letta <noreply@letta.com>
* catch contextwindowexceeded error
* fix(core): detect Google token limit errors as ContextWindowExceededError
Google's error message says "input token count exceeds the maximum
number of tokens allowed" which doesn't contain the word "context",
so it was falling through to generic LLMBadRequestError instead of
ContextWindowExceededError. This means compaction won't auto-trigger.
Expands the detection to also match "token count" and "tokens allowed"
in addition to the existing "context" keyword.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(core): add missing message arg to LLMBadRequestError in OpenAI client
The generic 400 path in handle_llm_error was constructing
LLMBadRequestError without the required message positional arg,
causing TypeError in prod during summarization.
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Co-Authored-By: Letta <noreply@letta.com>
* ci: add adapters/ test suite to core unit test matrix
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* fix(tests): update adapter error handling test expectations to match actual behavior
The streaming adapter's error handling double-wraps errors: the
AnthropicStreamingInterface calls handle_llm_error first, then the
adapter catches the result and calls handle_llm_error again, which
falls through to the base class LLMError. Updated test expectations
to match this behavior.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(core): prevent double-wrapping of LLMError in stream adapter
The AnthropicStreamingInterface.process() already transforms raw
provider errors into LLMError subtypes via handle_llm_error. The
adapter was catching the result and calling handle_llm_error again,
which didn't recognize the already-transformed LLMError and wrapped
it in a generic LLMError("Unhandled LLM error"). This downgraded
specific error types (LLMConnectionError, LLMServerError, etc.)
and broke retry logic that matches on specific subtypes.
Now the adapter checks if the error is already an LLMError and
re-raises it as-is. Tests restored to original correct expectations.
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---------
Co-authored-by: Letta <noreply@letta.com>
* test(core): strengthen git-memory system prompt stability integration coverage
Switch git-memory HTTP integration tests to OpenAI model handles and add assertions that system prompt content remains stable after normal turns and direct block value updates until explicit recompilation or reset.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(core): preserve git-memory formatting and enforce lock conflicts
Preserve existing markdown frontmatter formatting on block updates while still ensuring required metadata fields exist, and make post-push git sync propagate memory-repo lock conflicts as 409 responses. Also enable slash-containing core-memory block labels in route params and add regression coverage.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(memfs): fail closed on memory repo lock contention
Make memfs git commits fail closed when the per-agent Redis lock cannot be acquired, return 409 MEMORY_REPO_BUSY from the memfs files write API, and map that 409 back to core MemoryRepoBusyError so API callers receive consistent busy conflicts.
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Co-Authored-By: Letta <noreply@letta.com>
* chore(core): minimize git-memory fix scope to memfs lock and frontmatter paths
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* chore: drop unrelated changes and keep memfs-focused scope
Revert branch-only changes that are not required for the memfs lock contention and frontmatter-preservation fix so the PR contains only issue-relevant files.
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* fix(memfs): lock push sync path and improve nested sync diagnostics
Serialize memfs push-to-GCS sync with the same per-agent Redis lock key used by API commits, and add targeted post-push nested-block diagnostics plus a focused nested-label sync regression test for _sync_after_push.
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---------
Co-authored-by: Letta <noreply@letta.com>
* fix(core): stabilize system prompt refresh and expand git-memory coverage
Only rebuild system prompts on explicit refresh paths so normal turns preserve prefix-cache stability, including git/custom prompt layouts. Add integration coverage for memory filesystem tree structure and recompile/reset system-message updates via message-id retrieval.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(core): recompile system prompt around compaction and stabilize source tests
Force system prompt refresh before/after compaction in LettaAgentV3 so repaired system+memory state is used and persisted across subsequent turns. Update source-system prompt tests to explicitly recompile before raw preview assertions instead of assuming automatic rebuild timing.
👾 Generated with [Letta Code](https://letta.com)
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---------
Co-authored-by: Letta <noreply@letta.com>
GoogleAIClient and GoogleVertexClient were hardcoding Letta's managed
credentials for all requests, ignoring user-provided BYOK API keys.
This meant Letta was paying Google API costs for BYOK users.
Add _get_client_async and update _get_client to check BYOK overrides
(via get_byok_overrides / get_byok_overrides_async) before falling back
to managed credentials, matching the pattern used by OpenAIClient and
AnthropicClient.
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Google genai.errors.ClientError with code 400 was being caught and
wrapped as LLMBadRequestError but returned to clients as 502 because
no dedicated FastAPI exception handler existed for LLMBadRequestError.
- Add LLMBadRequestError exception handler in app.py returning HTTP 400
- Fix ErrorCode on Google 400 bad requests from INTERNAL_SERVER_ERROR
to INVALID_ARGUMENT
- Route Google API errors through handle_llm_error in stream_async path
Datadog: https://us5.datadoghq.com/error-tracking/issue/4eb3ff3c-d937-11f0-8177-da7ad0900000🤖 Generated with [Letta Code](https://letta.com)
Co-authored-by: Letta <noreply@letta.com>
* test: enable SQLAlchemy pooling in CI tests
Changes CI test config to use LETTA_DISABLE_SQLALCHEMY_POOLING=false,
enabling connection pooling to match production settings.
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* test: remove hardcoded LETTA_DISABLE_SQLALCHEMY_POOLING fixture from conftest
Remove the fixture that hardcoded the pooling setting in test code.
The value should instead come from the CI workflow environment via
vars.LETTA_DISABLE_SQLALCHEMY_POOLING (same source as production).
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Co-authored-by: Kian Jones <kianjones9@users.noreply.github.com>
Co-Authored-By: Letta <noreply@letta.com>
---------
Co-authored-by: Letta <noreply@letta.com>
Co-authored-by: letta-code <248085862+letta-code@users.noreply.github.com>
Co-authored-by: Kian Jones <kianjones9@users.noreply.github.com>
Re-apply changes on top of latest main to resolve merge conflicts.
- Add DatabaseLockNotAvailableError custom exception in orm/errors.py
- Catch asyncpg LockNotAvailableError and pgcode 55P03 in _handle_dbapi_error
- Register FastAPI exception handler returning 409 with Retry-After header
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Co-authored-by: Letta <noreply@letta.com>
Handle HTML error responses from ALB/load balancers in OpenAI client and
add explicit InternalServerError handling for Anthropic upstream issues.
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Co-authored-by: Letta <noreply@letta.com>
* fix(core): strip quotes from MCP server header keys and values
Users pasting JSON-formatted env vars into MCP server config end up with
quoted header names like `"CONTEXT7_API_KEY":` which causes
httpx.LocalProtocolError. Sanitize keys (strip surrounding quotes and
trailing colons) and values (strip surrounding quotes) in
resolve_custom_headers, resolve_environment_variables for HTTP configs,
and stdio env dicts.
Datadog: https://us5.datadoghq.com/error-tracking/issue/4a2f4af6-f2d8-11f0-930c-da7ad0900000🤖 Generated with [Letta Code](https://letta.com)
Co-Authored-By: Letta <noreply@letta.com>
* fix: revert stdio env sanitization to pass-through
The stdio path doesn't need header/env sanitization - that's only
relevant for SSE/streamable HTTP servers with auth headers.
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---------
Co-authored-by: Letta <noreply@letta.com>
* fix(core): catch all MCP tool execution errors instead of re-raising
MCP tools are external user-configured servers - any failure during
tool execution is expected and should be returned as (error_msg, False)
to the agent, not raised as an exception that hits Datadog as a 500.
Previously:
- base_client.py only caught McpError/ToolError, re-raised everything else
- fastmcp_client.py (both SSE and StreamableHTTP) always re-raised
Now all three execute_tool() methods catch all exceptions and return
the error message to the agent conversation. The agent handles tool
failures via the error message naturally.
This silences ~15 Datadog issue types including:
- fastmcp.exceptions.ToolError (validation, permissions)
- mcp.shared.exceptions.McpError (connection closed, credentials)
- httpx.HTTPStatusError (503 from Zapier, etc.)
- httpx.ConnectError, ReadTimeout, RemoteProtocolError
- requests.exceptions.ConnectionError
- builtins.ConnectionError
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* fix(core): log unexpected MCP errors at warning level with traceback
Expected MCP errors (ToolError, McpError, httpx.*, ConnectionError, etc.)
log at info level. Anything else (e.g. TypeError, AttributeError from
our own code) logs at warning with exc_info=True so it still surfaces
in Datadog without crashing the request.
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---------
Co-authored-by: Letta <noreply@letta.com>
* google gen ai format error fix
* fix(core): add $ref safety net, warning log, and unit tests for Google schema resolution
- Add `$ref` to unsupported_keys in `_clean_google_ai_schema_properties` so unresolvable refs (e.g. `#/properties/...` style) are stripped as a safety net instead of crashing the Google SDK
- Add warning log when `_resolve_json_schema_refs` encounters a ref it cannot resolve
- Deduplicate the `#/$defs/` and `#/definitions/` resolution branches
- Add 11 unit tests covering: single/multiple $defs, nested refs, refs in anyOf/allOf, array items, definitions key, unresolvable refs, and the full resolve+clean pipeline
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---------
Co-authored-by: Letta <noreply@letta.com>
* fix: handle system messages with mixed TextContent + ImageContent
System messages injected by external tools (e.g. packify.ai MCP) can
contain both TextContent and ImageContent. The assertions in
to_openai_responses_dicts and to_anthropic_dict expected exactly one
TextContent, causing AssertionError in production.
Extract all text parts and join them, matching how to_openai_dict
already handles this case.
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* fix: replace asserts with logger.warning + graceful skip
Asserts are the wrong tool for production input validation — if a
system message has only non-text content, we should warn and skip
rather than crash the request.
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---------
Co-authored-by: Letta <noreply@letta.com>
* fix(core): handle UTF-8 surrogate characters in API responses
LLM responses or user input can contain surrogate characters (U+D800-U+DFFF)
which are valid Python strings but illegal in UTF-8. ORJSONResponse rejects
them with "str is not valid UTF-8: surrogates not allowed". Add
SafeORJSONResponse that catches the TypeError and strips surrogates before
retrying serialization.
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* refactor: reuse sanitize_unicode_surrogates from json_helpers
Replace the inline _sanitize_surrogates function with the existing
sanitize_unicode_surrogates helper from letta.helpers.json_helpers,
which is already used across all LLM clients.
Co-authored-by: Kian Jones <kianjones9@users.noreply.github.com>
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Co-Authored-By: Letta <noreply@letta.com>
---------
Co-authored-by: Letta <noreply@letta.com>
Co-authored-by: letta-code <248085862+letta-code@users.noreply.github.com>
* fix: update ContextWindowCalculator to parse new system message sections
The context window calculator was using outdated position-based parsing
that only handled 3 sections (base_instructions, memory_blocks, memory_metadata).
The actual system message now includes additional sections that were not
being tracked:
- <memory_filesystem> (git-enabled agents)
- <tool_usage_rules> (when tool rules configured)
- <directories> (when sources attached)
Changes:
- Add _extract_tag_content() helper for proper XML tag extraction
- Rewrite extract_system_components() to return a Dict with all 6 sections
- Update calculate_context_window() to count tokens for new sections
- Add new fields to ContextWindowOverview schema with backward-compatible defaults
- Add unit tests for the extraction logic
* update
* generate
* fix: check attached file in directories section instead of core_memory
Files are rendered inside <directories> tags, not <memory_blocks>.
Update validate_context_window_overview assertions accordingly.
* fix: address review feedback for context window parser
- Fix git-enabled agents regression: capture bare file blocks
(e.g. <system/human.md>) rendered after </memory_filesystem> as
core_memory via new _extract_git_core_memory() method
- Make _extract_top_level_tag robust: scan all occurrences to find
tag outside container, handling nested-first + top-level-later case
- Document system_prompt tag inconsistency in docstring
- Add TODO to base_agent.py extract_dynamic_section linking to
ContextWindowCalculator to flag parallel parser tech debt
- Add tests: git-enabled agent parsing, dual-occurrence tag
extraction, pure text system prompt, git-enabled integration test
* add gpu runners and prod memory_repos
* add lmstudio and vllm in model_settings
* fix llm_configs and change variable name in reusable workflow and change perms for memory_repos to admin in tf
* fix: update self-hosted provider tests to use SDK 1.0 and v2 tests
- Update letta-client from ==0.1.324 to >=1.0.0
- Switch ollama/vllm/lmstudio tests to integration_test_send_message_v2.py
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Co-Authored-By: Letta <noreply@letta.com>
* fix: use openai provider_type for self-hosted model settings
ollama/vllm/lmstudio are not valid provider_type values in the SDK
model_settings schema - they use openai-compatible APIs so provider_type
should be openai. The provider routing is determined by the handle prefix.
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* fix: enable redis for ollama/vllm/lmstudio tests
Background streaming tests require Redis. Add use-redis: true to
self-hosted provider test workflows.
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Co-Authored-By: Letta <noreply@letta.com>
* prep for lmstudio and vllm
* used lmstudio_openai client
* change tool call parser from hermes to qwen3_xml
* qwen3_xmlk -> qwen3_coder
* revert to hermes (incompatible with parallel tool calls?) and skipping vllm tests on parallel tool calls
* install uv redis extra
* remove lmstudio
* create lmstudio test
* qwen3-14b on lmstudio
* try with qwen3-4b
* actually update the model config json to use qwen3-4b
* add test_providers::test_lmstudio
* bump timeout from 60 to 120 for slow lmstudio on cpu model
* misc vllm changes
---------
Co-authored-by: Letta <noreply@letta.com>
* fix(core): handle git memory label prefix collisions in filesystem view
Prevent context window preview crashes when a block label is both a leaf and a prefix (e.g. system/human and system/human/context) by rendering a node as both file and directory. Add regression test.
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Co-Authored-By: Letta <noreply@letta.com>
* fix(core): parse git-backed core memory in context window preview
ContextWindowCalculator.extract_system_components now detects git-backed memory rendering (<memory_filesystem> and <system/...> tags) when <memory_blocks> wrapper is absent, so core_memory is populated in the context preview. Add regression tests.
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Co-Authored-By: Letta <noreply@letta.com>
---------
Co-authored-by: Letta <noreply@letta.com>
* add gpu runners and prod memory_repos
* add lmstudio and vllm in model_settings
* fix llm_configs and change variable name in reusable workflow and change perms for memory_repos to admin in tf
* fix: update self-hosted provider tests to use SDK 1.0 and v2 tests
- Update letta-client from ==0.1.324 to >=1.0.0
- Switch ollama/vllm/lmstudio tests to integration_test_send_message_v2.py
🤖 Generated with [Letta Code](https://letta.com)
Co-Authored-By: Letta <noreply@letta.com>
* fix: use openai provider_type for self-hosted model settings
ollama/vllm/lmstudio are not valid provider_type values in the SDK
model_settings schema - they use openai-compatible APIs so provider_type
should be openai. The provider routing is determined by the handle prefix.
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Co-Authored-By: Letta <noreply@letta.com>
* fix: use openai_compat_base_url for ollama/vllm/lmstudio providers
When reconstructing LLMConfig from a model handle lookup, use the
provider's openai_compat_base_url (which includes /v1) instead of
raw base_url. This fixes 404 errors when calling ollama/vllm/lmstudio
since OpenAI client expects /v1/chat/completions endpoint.
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Co-Authored-By: Letta <noreply@letta.com>
* fix: enable redis for ollama/vllm/lmstudio tests
Background streaming tests require Redis. Add use-redis: true to
self-hosted provider test workflows.
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Co-Authored-By: Letta <noreply@letta.com>
* add memfs-py in prod bucket access
* change ollama
* change packer model defaults
* self-hosted provider support
* diasble reasoner to match the number of messages in test case, enable parallel tool calls, and pass embedding configs
* remove reasoning setting not supported for ollama
* add qwen3 to extra assistant message case
* lower temp
* prep for lmstudio and vllm
* used lmstudio_openai client
* skip parallel tool calls on cpu ran provider lmstudio
* revert downgrade since it's so slow already
* add reuired flags for tool call parsing etc.
* change tool call parser from hermes to qwen3_xml
* qwen3_xmlk -> qwen3_coder
* upgrade vllm to latest container
* revert to hermes (incompatible with parallel tool calls?) and skipping vllm tests on parallel tool calls
* install uv redis extra
* remove lmstudio
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Co-authored-by: Letta <noreply@letta.com>
