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

Status: Open.

#305 In charmbracelet/fantasy;

· 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

Status: Open.

feature

#304 In charmbracelet/fantasy;

· Curtis-Fletcher opened on Jun 30, 2026

No convenient way to define tools executed on client side

area: tools

Status: Open.

feature

#259 In charmbracelet/fantasy;

· fwang2002 opened on May 30, 2026

feat: add ClientMetadata to ToolResultPart

area: tools

Status: Open.

#257 In charmbracelet/fantasy;

· carsonfarmer opened on May 29, 2026

Include accumulated text in OnTextEnd callback

Status: Open.

#239 In charmbracelet/fantasy;

· carsonfarmer opened on May 15, 2026

Allow callers to disable all tools for a single Agent call

area: tools

Status: Open.

feature

#235 In charmbracelet/fantasy;

· fwang2002 opened on May 13, 2026

Add json type for ToolResponse

area: tools

Status: Open.

feature

#227 In charmbracelet/fantasy;

· fwang2002 opened on May 6, 2026

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

Status: Open.

feature

#224 In charmbracelet/fantasy;

· fwang2002 opened on May 3, 2026

openaicompat provider silently drops ToolResultOutputContentMedia — image/media tool results are lost

area: tools

provider: openai chatgpt

provider: openrouter

Status: Open.

#208 In charmbracelet/fantasy;

· ezynda3 opened on Apr 22, 2026

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

provider: anthropic claude

Status: Open.

bug

#130 In charmbracelet/fantasy;

· ivan-cstv opened on Feb 3, 2026

Support for embeddings endpoint

Status: Open.

feature

#122 In charmbracelet/fantasy;

· acheong08 opened on Jan 22, 2026

Native json output support for agents

Status: Open.

feature

#118 In charmbracelet/fantasy;

· rashadism opened on Jan 17, 2026