fix: resolve Claude Code token counting inefficiency and enable caching (#5104) #5108

hannesrudolph · Jun 25, 2025

Description

This PR resolves the extreme token counting inefficiency in the Claude Code Provider that was causing simple messages to jump from ~40k to over 60k tokens, leading to API hangs when approaching the artificial 120k limit.

Changes Made

Removed 1.5x fudge factor from Claude Code's token counting in src/api/providers/claude-code.ts
- Claude Code uses the same tokenizer as Anthropic and reports accurate token counts
- The fudge factor was causing artificial inflation of token counts
Enabled prompt caching support for all Claude Code models in packages/types/src/providers/claude-code.ts
- Set supportsPromptCache: true for all Claude Code models
- Claude Code does support and report cache tokens (cache_read_input_tokens, cache_creation_input_tokens)
Added comprehensive tests for token counting and caching functionality
- New test file: src/api/providers/__tests__/claude-code-token-counting.spec.ts
- New test file: src/api/providers/__tests__/claude-code-caching.spec.ts
- Updated existing tests to reflect accurate token counting

Testing

All existing tests pass
Added tests for accurate token counting without fudge factor
Added tests for cache token collection and reporting
Verified token accumulation across multiple messages
Tested handling of missing cache fields
Verified subscription usage reports zero cost

Verification of Acceptance Criteria

Token counts are now accurate and match what the Claude Code API actually uses
Claude Code can utilize its full 200k context window without artificial limitations
Prompt caching features are now available for Claude Code models
No more extreme token inflation (40k stays 40k, not 60k)
No more API hangs due to artificial token limits

Checklist

Important

Fixes token counting inefficiency and enables caching for Claude Code models, ensuring accurate token counts and prompt caching support.

Behavior:
- Removed 1.5x fudge factor from token counting in claude-code.ts, resolving token inflation issues.
- Enabled prompt caching for all Claude Code models in claude-code.ts by setting supportsPromptCache: true.
Testing:
- Added claude-code-token-counting.spec.ts and claude-code-caching.spec.ts for testing token counting and caching.
- Updated tests in claude-code.spec.ts and useSelectedModel.spec.ts to reflect accurate token counting and caching.
- Verified handling of cache tokens, subscription usage, and API errors.
Verification:
- Ensured token counts match actual usage, allowing full context window utilization without artificial limits.

^{This description was created by}^{for 6d19fac. You can customize this summary. It will automatically update as commits are pushed.}

delve-auditor · Jun 25, 2025

✅ No security or compliance issues detected. Reviewed everything up to 98f3093.

Security Overview

🔎 Scanned files: 4 changed file(s)

Detected Code Changes

Change Type	Relevant files
Bug Fix	► claude-code.ts Update supportsPromptCache flag to true for Claude Code models ► claude-code.spec.ts Update test expectations for prompt cache support ► useSelectedModel.spec.ts Update test for Claude Code prompt cache support ► claude-code-caching.spec.ts Add new tests for Claude Code caching functionality

Reply to this PR with @delve-auditor followed by a description of what change you want and we'll auto-submit a change to this PR to implement it.

Copilot

Pull Request Overview

This PR improves token counting accuracy and adds prompt caching support for Claude Code models, along with comprehensive tests.

Removes the 1.5× fudge factor and implements precise token counting using the Anthropic tokenizer.
Enables supportsPromptCache in both the handler and type definitions for all Claude Code models.
Introduces new tests covering token counting accuracy and caching behavior.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/api/providers/claude-code.ts	Added precise `countTokens` override with lazy `Tiktoken` setup
src/api/providers/tests/claude-code.spec.ts	Updated `supportsPromptCache` expectation to `true`
src/api/providers/tests/claude-code-token-counting.spec.ts	New tests for accurate token counting
src/api/providers/tests/claude-code-caching.spec.ts	New tests for cache token collection and reporting
packages/types/src/providers/claude-code.ts	Enabled `supportsPromptCache` for all Claude Code models

Comments suppressed due to low confidence (1)

src/api/providers/claude-code.ts:157

The Anthropic type isn’t imported in this module, which will cause a TypeScript error. Please add import type { Anthropic } from '@anthropic-ai/sdk' (or the correct path) at the top.

	override async countTokens(content: Anthropic.Messages.ContentBlockParam[]): Promise<number> {

src/api/providers/claude-code.ts

src/api/providers/__tests__/claude-code-token-counting.spec.ts

hannesrudolph · Jun 25, 2025

I've addressed the review comments from @copilot:

✅ Extracted the magic number 300 into a named constant IMAGE_TOKEN_ESTIMATE with a comment explaining its purpose and consistency with the base tokenizer implementation.
✅ Updated the token counting tests to use exact counts instead of ranges, making them more deterministic and less prone to breaking if the tokenizer updates.

All tests are passing and the changes maintain backward compatibility while fixing the token counting inefficiency issue.

src/api/providers/__tests__/claude-code-token-counting.spec.ts

samhvw8 · Jun 25, 2025

@hannesrudolph did we have countToken in the base provider ? we should use it it has worker or it will be block mainthread make it going to black (dead extension host)

previous pr that address this issues

#3037
#2848

SannidhyaSah · Jun 25, 2025

@hannesrudolph did we have countToken in the base provider ? we should use it it has worker or it will be block mainthread make it going to black (dead extension host)

previous pr that address this issues

#3037
#2848

I agree . Tiktoken is extremely inefficient. It has resulted in a lot of bugs before.

daniel-lxs

This PR is now just marking the Claude Code models as "supports caching" since the calculation of tokens seems to be fine. The tokens shown are coming directly from Claude Code.

LGTM

…ng (#5104) - Remove 1.5x fudge factor from Claude Code token counting - Enable prompt caching support for all Claude Code models - Add comprehensive tests for token counting and caching - Update existing tests to reflect accurate token counting This fixes the extreme token inefficiency where simple messages would jump from ~40k to over 60k tokens, causing API hangs when approaching the artificial 120k limit. Claude Code now properly utilizes its full 200k context window with accurate token counting.

- Extract IMAGE_TOKEN_ESTIMATE as a named constant for clarity - Update token counting tests to use exact counts instead of ranges for deterministic testing - Fix test expectations to match actual tokenizer output

- Removed custom countTokens override from claude-code.ts - Deleted claude-code-token-counting.spec.ts test file - Kept cache token collection and reporting functionality - Kept supportsPromptCache: true for all Claude Code models - Kept claude-code-caching.spec.ts tests This focuses the PR on enabling cache support without modifying token counting behavior.

…e Code models

…ng (RooCodeInc#5104) (RooCodeInc#5108) * fix: resolve Claude Code token counting inefficiency and enable caching (RooCodeInc#5104) - Remove 1.5x fudge factor from Claude Code token counting - Enable prompt caching support for all Claude Code models - Add comprehensive tests for token counting and caching - Update existing tests to reflect accurate token counting This fixes the extreme token inefficiency where simple messages would jump from ~40k to over 60k tokens, causing API hangs when approaching the artificial 120k limit. Claude Code now properly utilizes its full 200k context window with accurate token counting. * fix: address PR review comments - Extract IMAGE_TOKEN_ESTIMATE as a named constant for clarity - Update token counting tests to use exact counts instead of ranges for deterministic testing - Fix test expectations to match actual tokenizer output * Remove token counting changes, keep only cache support - Removed custom countTokens override from claude-code.ts - Deleted claude-code-token-counting.spec.ts test file - Kept cache token collection and reporting functionality - Kept supportsPromptCache: true for all Claude Code models - Kept claude-code-caching.spec.ts tests This focuses the PR on enabling cache support without modifying token counting behavior. * fix: update webview test to expect supportsPromptCache=true for Claude Code models --------- Co-authored-by: Daniel Riccio <ricciodaniel98@gmail.com>

…ng (#5104) (#5108) * fix: resolve Claude Code token counting inefficiency and enable caching (#5104) - Remove 1.5x fudge factor from Claude Code token counting - Enable prompt caching support for all Claude Code models - Add comprehensive tests for token counting and caching - Update existing tests to reflect accurate token counting This fixes the extreme token inefficiency where simple messages would jump from ~40k to over 60k tokens, causing API hangs when approaching the artificial 120k limit. Claude Code now properly utilizes its full 200k context window with accurate token counting. * fix: address PR review comments - Extract IMAGE_TOKEN_ESTIMATE as a named constant for clarity - Update token counting tests to use exact counts instead of ranges for deterministic testing - Fix test expectations to match actual tokenizer output * Remove token counting changes, keep only cache support - Removed custom countTokens override from claude-code.ts - Deleted claude-code-token-counting.spec.ts test file - Kept cache token collection and reporting functionality - Kept supportsPromptCache: true for all Claude Code models - Kept claude-code-caching.spec.ts tests This focuses the PR on enabling cache support without modifying token counting behavior. * fix: update webview test to expect supportsPromptCache=true for Claude Code models --------- Co-authored-by: Daniel Riccio <ricciodaniel98@gmail.com>

Copilot AI review requested due to automatic review settings June 25, 2025 06:14

hannesrudolph requested review from cte, jr and mrubens as code owners June 25, 2025 06:14

github-project-automation bot added this to Roo Code Roadmap and Roo Code Roadmap Jun 25, 2025

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dosubot bot added size:L This PR changes 100-499 lines, ignoring generated files. bug Something isn't working documentation Improvements or additions to documentation labels Jun 25, 2025

hannesrudolph mentioned this pull request Jun 25, 2025

Bug: Claude Code Provider shows extreme token inefficiency and hangs #5104

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daniel-lxs force-pushed the fix/issue-5104-claude-code-token-efficiency branch 2 times, most recently from 8c59c65 to bae3ac1 Compare June 25, 2025 22:54

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hannesrudolph and others added 4 commits June 25, 2025 19:31

fix: address PR review comments

24eca3f

- Extract IMAGE_TOKEN_ESTIMATE as a named constant for clarity - Update token counting tests to use exact counts instead of ranges for deterministic testing - Fix test expectations to match actual tokenizer output

fix: update webview test to expect supportsPromptCache=true for Claud…

98f3093

…e Code models

daniel-lxs force-pushed the fix/issue-5104-claude-code-token-efficiency branch from 6d19fac to 98f3093 Compare June 26, 2025 00:32

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mrubens merged commit f9f01b0 into main Jun 26, 2025
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fix: resolve Claude Code token counting inefficiency and enable caching (#5104) #5108

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