backends/ollama.rs implements the Backend trait against Ollama's
POST /api/chat (messages + tools arrays, message.tool_calls response) --
never mesh/listener/assist.rs::call_ollama's older single-shot prompt
endpoint, which has no tool-calling support at all. Ollama's per-call
tool-call ids (absent on the wire) are synthesized; its already-parsed
function.arguments object is passed through without a second string-parse
(the OpenAI-shape normalization would be wrong here). Every request sets
an explicit generation-length cap and runs non-streaming.
model_supports_tools queries Ollama's /api/show and caches the answer for
the process lifetime, turning AI-SPEC's [ASSUMED] note about
qwen2.5-coder's tool capability into a runtime fact: a non-tool-capable or
unreachable Ollama falls through to Claude with a logged reason, never a
silent tools-free degrade.
select_backend (backends/mod.rs) is now async and reuses the existing
detect_ollama() probe (mesh::assistant, bumped to pub(crate) for this
reuse) rather than re-probing. A new FallbackChain wraps the Ollama leg so
a transport error mid-turn falls through to Claude for that same call
instead of failing the turn outright.
13 new tests under assistant::backends::{ollama,}::tests::, exercised
against a local hyper-based HTTP stub (no mock-HTTP crate exists in this
workspace). Full assistant:: suite: 42/42 (29 baseline + 13 new).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
