# NousResearch/hermes-agent · Kimi-compatible custom endpoints and Anthropic thinking suppression

## Open now

- Nothing open on GitHub.

These members all concern Kimi-compatible custom endpoints using the Anthropic messages mode, where an issue reports a problem after a tool call with thinking enabled. Two pull requests propose suppressing or broadening suppression of thinking for such endpoints; their outcomes are not established here.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #17455. Verify it addresses your case.
- **Recommended:** read PR #17455 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-17455`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #17057: Custom Kimi-compatible endpoint with api_mode=anthropic_messages fails after tool call when thinking is enabled

## Prior & competing PRs

- **#17455: fix(anthropic): broaden Kimi thinking-suppression to custom endpoints**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/anthropic_adapter.py`, `tests/agent/test_kimi_coding_anthropic_thinking.py`
  - fix hunks:
  - `agent/anthropic_adapter.py`

    ```diff
    @@ -20,7 +20,7 @@
     
     from hermes_constants import get_hermes_home
     from typing import Any, Dict, List, Optional, Tuple
    -from utils import normalize_proxy_env_vars
    +from utils import base_url_host_matches, normalize_proxy_env_vars
     
     # NOTE: `import anthropic` is deliberately NOT at module top — the SDK pulls
     # ~220 ms of imports (anthropic.types, anthropic.lib.tools._beta_runner, etc.)
    ```

    ```diff
    @@ -365,6 +365,61 @@ def _is_kimi_coding_endpoint(base_url: str | None) -> bool:
         return normalized.rstrip("/").lower().startswith("https://api.kimi.com/coding")
     
     
    +# Model-name prefixes that identify the Kimi / Moonshot family.  Covers
    +# - official slugs: ``kimi-k2.5``, ``kimi_thinking``, ``moonshot-v1-8k``
    +# - common release lines: ``k1.5-...``, ``k2-thinking``, ``k25-...``, ``k2.5-...``
    +# Matched case-insensitively against the post-``normalize_model_name`` form,
    +# so a caller's ``provider/vendor/model`` slug is handled the same as a
    +# bare name.
    +_KIMI_FAMILY_MODEL_PREFIXES = (
    +    "kimi-", "kimi_",
    +    "moonshot-", "moonshot_",
    +    "k1.", "k1-",
    +    "k2.", "k2-",
    +    "k25", "k2.5",
    +)
    +
    +
    +def _model_name_is_kimi_family(model: str | None) -> bool:
    +    if not isinstance(model, str):
    +        return False
    +    m = model.strip().lower()
    +    if not m:
    +        return False
    +    # Strip vendor prefix (e.g. ``moonshotai/kimi-k2.5`` → ``kimi-k2.5``)
    +    if "/" in m:
    +        m = m.rsplit("/", 1)[-1]
    +    return m.startswith(_KIMI_FAMILY_MODEL_PREFIXES)
    +
    +
    +def _is_kimi_family_endpoint(base_url: str | None, model: str | None = None) -> bool:
    +    """Return True for any Kimi / Moonshot Anthropic-Messages-speaking endpoint.
    +
    +    Broader than ``_is_kimi_coding_endpoint`` — matches:
    +
    +    - Kimi's official ``/coding`` URL (legacy check, preserved)
    +    - Any ``api.kimi.com`` / ``moonshot.ai`` / ``moonshot.cn`` host
    +    - Custom or proxied endpoints whose *model* name is in the Kimi / Moonshot
    +      family (``kimi-*``, ``moonshot-*``, ``k1.*``, ``k2.*``, …).  Users with
    +      ``api_mode: anthropic_messages`` on a private gateway fronting Kimi
    +      fall into this branch — the upstream still enforces Kimi's thinking
    +      semantics (reasoning_content required on every replayed tool-call
    +      message) regardless of the gateway's hostname.
    +
    +    Used to decide whether to drop Anthropic's ``thinking`` kwarg and to
    +    preserve unsigned reasoning_content-derived thinking blocks on replay.
    +    See hermes-agent#13848, #17057.
    +    """
    +    if _is_kimi_coding_endpoint(base_url):
    +        return True
    +    for _domain in ("api.kimi.com", "moonshot.ai", "moonshot.cn"):
    +        if base_url_host_matches(base_url or "", _domain):
    +            return True
    +    if _model_name_is_kimi_family(model):
    +        return True
    +    return False
    +
    +
     def _requires_bearer_auth(base_url: str | None) -> bool:
         """Return True for Anthropic-compatible providers that require Bearer auth.
     
    ```

    ```diff
    @@ -1265,6 +1320,7 @@ def _convert_content_to_anthropic(content: Any) -> Any:
     def convert_messages_to_anthropic(
         messages: List[Dict],
         base_url: str | None = None,
    +    model: str | None = None,
     ) -> Tuple[Optional[Any], List[Dict]]:
         """Convert OpenAI-format messages to Anthropic format.
     
    ```

    ```diff
    @@ -1276,6 +1332,12 @@ def convert_messages_to_anthropic(
         endpoint, all thinking block signatures are stripped.  Signatures are
         Anthropic-proprietary — third-party endpoints cannot validate them and will
         reject them with HTTP 400 "Invalid signature in thinking block".
    +
    +    When *model* is provided and matches the Kimi / Moonshot family (or
    +    *base_url* is a Kimi / Moonshot host), unsigned thinking blocks
    +    synthesised from ``reasoning_content`` are preserved on replayed
    +    assistant tool-call messages — Kimi requires the field to exist, even
    +    if empty.
         """
         system = None
         result = []
    ```

    ```diff
    @@ -1504,7 +1566,7 @@ def convert_messages_to_anthropic(
         #    cache markers can interfere with signature validation.
         _THINKING_TYPES = frozenset(("thinking", "redacted_thinking"))
         _is_third_party = _is_third_party_anthropic_endpoint(base_url)
    -    _is_kimi = _is_kimi_coding_endpoint(base_url)
    +    _is_kimi = _is_kimi_family_endpoint(base_url, model)
     
         last_assistant_idx = None
         for i in range(len(result) - 1, -1, -1):
    ```

    ```diff
    @@ -1627,7 +1689,9 @@ def build_anthropic_kwargs(
         Currently only supported on native Anthropic endpoints (not third-party
         compatible ones).
         """
    -    system, anthropic_messages = convert_messages_to_anthropic(messages, base_url=base_url)
    +    system, anthropic_messages = convert_messages_to_anthropic(
    +        messages, base_url=base_url, model=model
    +    )
         anthropic_tools = convert_tools_to_anthropic(tools) if tools else []
     
         model = normalize_model_name(model, preserve_dots=preserve_dots)
    ```

    ```diff
    @@ -1733,7 +1797,7 @@ def build_anthropic_kwargs(
         # silently hides reasoning text that Hermes surfaces in its CLI. We
         # request "summarized" so the reasoning blocks stay populated — matching
         # 4.6 behavior and preserving the activity-feed UX during long tool runs.
    -    _is_kimi_coding = _is_kimi_coding_endpoint(base_url)
    +    _is_kimi_coding = _is_kimi_family_endpoint(base_url, model)
         if reasoning_config and isinstance(reasoning_config, dict) and not _is_kimi_coding:
             if reasoning_config.get("enabled") is not False and "haiku" not in model.lower():
                 effort = str(reasoning_config.get("effort", "medium")).lower()
    ```
  - `tests/agent/test_kimi_coding_anthropic_thinking.py`

    ```diff
    @@ -94,13 +94,16 @@ def test_native_anthropic_still_gets_thinking(self) -> None:
             )
             assert "thinking" in kwargs
     
    -    def test_kimi_root_endpoint_unaffected(self) -> None:
    -        """Only the /coding route is special-cased — plain api.kimi.com is not.
    -
    -        ``api.kimi.com`` without ``/coding`` uses the chat_completions transport
    -        (see runtime_provider._detect_api_mode_for_url); build_anthropic_kwargs
    -        should never see it, but if it somehow does we should not suppress
    -        thinking there — that path has different semantics.
    +    def test_kimi_root_endpoint_via_anthropic_transport_omits_thinking(self) -> None:
    +        """Plain ``api.kimi.com`` hit via the Anthropic transport also omits thinking.
    +
    +        Auto-detection routes ``api.kimi.com/v1`` to ``chat_completions`` by
    +        default, but users can explicitly configure
    +        ``api_mode: anthropic_messages`` against any Kimi host.  The upstream
    +        validation (reasoning_content required on replayed tool-call
    +        messages) is the same regardless of URL path, so the thinking
    +        suppression must apply to every Kimi host, not just ``/coding``.
    +        See #17057.
             """
             from agent.anthropic_adapter import build_anthropic_kwargs
     
    ```

    ```diff
    @@ -112,4 +115,98 @@ def test_kimi_root_endpoint_unaffected(self) -> None:
                 reasoning_config={"enabled": True, "effort": "medium"},
                 base_url="https://api.kimi.com/v1",
             )
    +        assert "thinking" not in kwargs
    +
    +    # ── #17057: custom / proxied Kimi-compatible endpoints ──────────
    +    @pytest.mark.parametrize(
    +        "base_url,model",
    +        [
    +            # Custom host with Kimi-family model — the reporter's case
    +            ("http://my-kimi-proxy.internal", "kimi-2.6"),
    +            ("https://llm.example.com/anthropic", "kimi-k2.5"),
    +            ("https://llm.example.com/anthropic", "moonshot-v1-8k"),
    +            ("https://llm.example.com/anthropic", "kimi_thinking"),
    +            ("https://llm.example.com/anthropic", "moonshotai/kimi-k2.5"),
    +            # Official Moonshot host (previously uncovered)
    +            ("https://api.moonshot.ai/anthropic", "moonshot-v1-32k"),
    +            ("https://api.moonshot.cn/anthropic", "moonshot-v1-32k"),
    +        ],
    +    )
    +    def test_kimi_family_custom_endpoint_omits_thinking(
    +        self, base_url: str, model: str
    +    ) -> None:
    +        """Custom / proxied Kimi endpoints must also strip Anthropic thinking."""
    +        from agent.anthropic_adapter import build_anthropic_kwargs
    +
    +        kwargs = build_anthropic_kwargs(
    +            model=model,
    +            messages=[{"role": "user", "content": "hello"}],
    +            tools=None,
    +            max_tokens=4096,
    +            reasoning_config={"enabled": True, "effort": "medium"},
    +            base_url=base_url,
    +        )
    +        assert "thinking" not in kwargs, (
    +            f"Kimi-family endpoint ({base_url}, {model}) must not receive "
    +            f"Anthropic thinking — upstream validates reasoning_content on "
    +            f"replayed tool-call history we don't preserve."
    +        )
    +        assert "output_config" not in kwargs
    +
    +    def test_custom_endpoint_non_kimi_model_keeps_thinking(self) -> None:
    +        """Custom endpoint with a non-Kimi model must keep thinking intact.
    +
    +        Guards against over-broad model-family matching — only model names
    +        starting with a Kimi/Moonshot prefix should trigger suppression.
    +        """
    +        from agent.anthropic_adapter import build_anthropic_kwargs
    +
    +        kwargs = build_anthropic_kwargs(
    +            model="MiniMax-M2.7",
    +            messages=[{"role": "user", "content": "hello"}],
    +            tools=None,
    +            max_tokens=4096,
    +            reasoning_config={"enabled": True, "effort": "medium"},
    +            base_url="https://my-llm-proxy.example.com/anthropic",
    +        )
             assert "thinking" in kwargs
    +        assert kwargs["thinking"]["type"] == "enabled"
    +
    +    def test_kimi_family_replay_preserves_unsigned_thinking(self) -> None:
    +        """On a custom Kimi endpoint, unsigned reasoning_content thinking
    +        blocks must survive the third-party signature-stripping pass so
    +        the upstream's message-history validation passes.
    +        """
    +        from agent.anthropic_adapter import convert_messages_to_anthropic
    +
    +        messages = [
    +            {"role": "user", "content": "hi"},
    +            {
    +                "role": "assistant",
    +                "reasoning_content": "planning the tool call",
    +                "tool_calls": [
    +                    {
    +                        "id": "call_1",
    +                        "type": "function",
    +                        "function": {"name": "skill_view", "arguments": "{}"},
    +                    }
    +                ],
    +            },
    +            {"role": "tool", "tool_call_id": "call_1", "content": "ok"},
    +        ]
    +        _, converted = convert_messages_to_anthropic(
    +            messages,
    +            base_url="http://my-kimi-proxy.internal",
    +            model="kimi-2.6",
    +        )
    +        # The assistant message still carries the unsigned thinking block
    +        # synthesised from reasoning_content (required by Kimi's history
    +        # validation).  A plain third-party endpoint would have stripped it.
    +        assistant_msg = next(m for m in converted if m["role"] == "assistant")
    +        assistant_blocks = assistant_msg["content"]
    +        thinking_blocks = [
    +            b for b in assistant_blocks
    +            if isinstance(b, dict) and b.get("type") == "thinking"
    +        ]
    +        assert len(thinking_blocks) == 1
    +        assert thinking_blocks[0]["thinking"] == "planning the tool call"
    ```
- **#17065: fix(anthropic): suppress thinking on Kimi-compatible custom endpoints (#17057)**. closed without merge
  - maintainer direction: category `silent_close`; implication `active`

## Fix status

- Merged to main in PR #17455 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-04-29`. This confirmation is old and may be out of date (a revert/reopen would not have invalidated it here); re-verify.