* feat: show real-time context window usage in chat UI (#3125)
Adds a `context_usage` block to `GET /api/threads/{id}/token-usage`
(token count from the live checkpoint, the thread model's
`context_window`, and a percentage), introduces a new
`ModelConfig.context_window` distinct from the per-call `max_tokens`
output cap, and surfaces the percentage in the chat header — inside
`TokenUsageIndicator` when token-usage tracking is on, or as a
standalone badge when it's off so context capacity stays visible
independent of cost tracking.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* feat: per-category breakdown for context window usage
Replace the single-number context_usage payload with a Claude-Code-style
breakdown — messages, system prompt, skills, system/MCP tools (active +
deferred), custom agents, memory injection, autocompact buffer, and free
space — and surface it in the chat UI with a segmented progress bar and
per-row table.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* docs(config): document context_window across model examples
Add `context_window` to every example model in config.example.yaml so the
new chat-UI "% context used" indicator works out of the box for whichever
example a user adopts. Each value is the published default at the time of
writing; users are pointed at the official model spec to verify. Bumps
config_version to 11 so `make config-upgrade` flags outdated user configs.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* style: ruff format (line-length 240)
No behavior change — collapses two multi-line expressions that fit on
one line under the project's 240-char limit. Picked up by `make format`.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* review: address Copilot bot comments on #3183
- token-usage-indicator: switch `{contextPercentage && (...)}` to an
explicit `!= null` check. (The string `"0"` is actually truthy in JS so
the original code wasn't buggy, but the explicit check is clearer.)
- context-usage-breakdown: drop the `useMemo` around segments/totals — the
computation is O(n) over a handful of rows and the previous memo deps
omitted `t.contextUsage.categories`, so the bar's tooltips/aria-labels
could stay in the old language after a locale switch.
- context_usage._split_tools: snapshot MCP names from
`get_cached_mcp_tools()` directly instead of re-reading
`extensions_config.json` after `get_available_tools()` already loaded
it. Removes redundant file I/O on every `/token-usage` poll.
(`get_available_tools()` still emits its own INFO logs — silencing
those is out of scope here.)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* style(frontend): prettier --write context-usage-breakdown
CI's `pnpm format` (prettier --check) caught two lines previously
formatted by hand. Collapses one comma to fit on one line; no behavior
change.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* fix(gateway): correct context-usage breakdown + add exact token counting
The context-usage indicator shipped two bugs that silently zeroed whole
breakdown rows (both caught by try/except, so the feature looked alive but
produced wrong numbers):
1. _count_system_prompt passed app_config= to get_deferred_tools_prompt_section,
which only accepts deferred_names -> TypeError swallowed -> system_prompt
row always 0, and used_tokens/percentage undercounted by the full prompt.
Also subtracted the deferred section twice (the rendered prompt already
excluded it). Fix: derive deferred names deterministically and pass them to
apply_prompt_template; drop the redundant subtraction.
2. _split_tools imported a non-existent get_deferred_registry -> ImportError
swallowed -> all four tool-category rows always 0. Fix: classify via the
public is_mcp_tool predicate + tool_search.enabled (mirrors
build_deferred_tool_setup); the MCP tag is set by get_available_tools.
Added token_usage.counting (approximate|exact). 'exact' routes text/schema/
message counting through the model tokenizer (tiktoken cl100k_base) via the
existing memory-module machinery (lazy load + cache + cooldown + CJK-aware
fallback), so CJK-heavy threads stop being undercounted by chars//4.
Regression + e2e tests added; 6621 backend tests pass.
* fix(gateway): harden context usage accounting
* fix(gateway): count promoted MCP tools as active in context usage
Promoted tools (deferred MCP tools the thread has fetched via tool_search)
have their full schema bound on every subsequent turn by
DeferredToolFilterMiddleware, so they consume context like any active tool.
The breakdown previously left them in the reserved *_deferred rows, under-
counting the thread's used_tokens.
Classification now treats a tool as deferred only when tool_search is enabled,
it is MCP-sourced, AND it has not been promoted. The promoted set is read from
the checkpoint's channel_values and scoped by catalog hash — matching the
runtime middleware, so a stale promotion from MCP-config drift cannot inflate
the active count.
The static system prompt still lists all deferred tool names (promotions only
affect schema binding, not the prompt), so _count_system_prompt's deferred
rendering is intentionally left unchanged.
8 new tests cover classification, catalog-hash scoping (match / drift /
compute-failure / malformed), and checkpoint extraction.
* fix(context): address review feedback
* fix(context): count structured message payloads
* fix(context): harden usage accounting
* fix(config): bump schema for context usage fields
* refactor: narrow context usage to core indicator
---------
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
