Files
OmniRoute/tests/unit
Ryan Brosas 2bee8a2b0b fix(web-tools): anchor tool contract at prompt tail + user-turn reminder
The <tool> contract from prepareToolMessages was prepended as the first
system message. Web executors fold all system messages into one block, so
with agentic clients whose system prompts exceed ~28K chars the contract
sat at the head of a huge block and web models ignored it, refusing tool
calls with "tool X is not in my tool set" (chatgpt-web, 0/3 at 30K chars).

Two changes, both required in testing:

- Dual placement: the full contract now rides as a trailing system
  message (folds to the tail of the system block) and a one-line
  reminder naming the tools is appended to the latest user message.
- Rewording: the contract now frames injected tools as client tools
  invoked via a plain-text protocol, distinct from the model's native
  tool registry (web.run, python.exec, ...), and instructs the model to
  never claim they are unavailable. Without this the model resolved
  tool names against its native registry and refused even when it had
  seen the contract.

Measured on cgpt-web gpt-5.5-thinking/gpt-5.6-thinking/o3: prepend 0/3
tool calls at 30K chars; dual placement 16/17 across 30K-250K system
prompts, 30-tool sets, multi-turn tool history, streaming, and 3-way
concurrency, with no spurious calls on no-tool prompts. Known limit:
~40K-char single user messages still flake (2/3) due to the upstream
model's own injection heuristics.

All prepareToolMessages consumers parse system messages
position-independently and select the current user turn by role scan,
so the trailing system message is shape-safe for every web executor.
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