Issues

• Add OpenTelemetry tracing with GenAI semantic conventions

  charmbracelet/fantasy#418 · Filter by author LarsArtmann opened on Oct 16, 2026

• OpenAI Responses drops replay metadata, error details, and echoed service tier

  provider: openai chatgpt
  charmbracelet/fantasy#411 · Filter by author kevinle128 opened on Oct 5, 2026

• OpenAI replay drops encrypted reasoning and cannot require stream completion

  provider: openai chatgpt
  charmbracelet/fantasy#406 · Filter by author kevinle128 opened on Oct 1, 2026

• Wrong Header Injection

  bug

  charmbracelet/fantasy#384 · Filter by author rocktavious opened on Sep 22, 2026

• jsonrepair: repairing already-valid JSON changes the decoded value (three cases)

  charmbracelet/fantasy#377 · Filter by author feiiiiii5 opened on Sep 20, 2026

• Update project to Go 1.27.0

  feature

  charmbracelet/fantasy#345 · Filter by author ardan-bkennedy opened on Aug 22, 2026

• Agent API: no way to place a cache_control breakpoint inside the system prompt

  charmbracelet/fantasy#305 · Filter by author cameronsjo opened on Jul 2, 2026

• When validating tool parameters an improved error message could encourage LLMs to auto-heal their tool call

  area: tools
  feature

  charmbracelet/fantasy#304 · Filter by author Curtis-Fletcher opened on Jun 30, 2026

• No convenient way to define tools executed on client side

  area: tools
  feature

  charmbracelet/fantasy#259 · Filter by author fwang2002 opened on May 30, 2026

• Include accumulated text in OnTextEnd callback

  charmbracelet/fantasy#239 · Filter by author carsonfarmer opened on May 15, 2026
  2

• Allow callers to disable all tools for a single Agent call

  area: tools
  feature

  charmbracelet/fantasy#235 · Filter by author fwang2002 opened on May 13, 2026

• Add json type for ToolResponse

  area: tools
  feature

  charmbracelet/fantasy#227 · Filter by author fwang2002 opened on May 6, 2026

• Add application-level extension field and PrepareCall hook to AgentCall / AgentStreamCall

  feature

  charmbracelet/fantasy#224 · Filter by author fwang2002 opened on May 3, 2026
  1

• Config mismatch: Fantasy doesn't respect context_window from Catwalk provider configs

  provider: anthropic claude
  bug

  charmbracelet/fantasy#130 · Filter by author ivan-cstv opened on Feb 3, 2026
  1

• Support for embeddings endpoint

  feature

  charmbracelet/fantasy#122 · Filter by author acheong08 opened on Jan 22, 2026

• Native json output support for agents

  feature

  charmbracelet/fantasy#118 · Filter by author rashadism opened on Jan 17, 2026
  2

• ParseAndValidate validates schema against Map instead of actualy StructuredOutput Type

  bug

  charmbracelet/fantasy#101 · Filter by author ozodrukh opened on Dec 15, 2025
  1

• Deduplicate code across providers and core logic

  charmbracelet/fantasy#95 · Filter by author LarsArtmann opened on Dec 10, 2025

• Structured response for streaming mode

  feature

  charmbracelet/fantasy#89 · Filter by author casidiablo opened on Dec 2, 2025

• Support sending traces to MLFlow

  feature

  charmbracelet/fantasy#62 · Filter by author casidiablo opened on Nov 5, 2025

• Support for MCP

  area: mcp
  feature

  charmbracelet/fantasy#55 · Filter by author arunsworld opened on Nov 1, 2025
  5