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Codex sub-agent functionality broken for many models

By PulseAugur Editorial · [1 sources] ·

A user encountered significant issues troubleshooting sub-agents with Codex, discovering that many models can no longer effectively utilize this feature. The problem stems from Codex's updated requirement for models to emit a namespace for sub-agent related tool calls. Despite these challenges, the user's Pi Agent remains functional. AI

IMPACT Indicates a potential breakdown in tool integration for LLM agents, requiring model updates or workarounds.

RANK_REASON User-reported issue with a specific product's functionality.

Read on Mastodon — fosstodon.org →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Codex sub-agent functionality broken for many models

How we ranked this

Signal score
0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
User-reported issue with a specific product's functionality.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, infra
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
38 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [1]

  1. Mastodon — fosstodon.org TIER_1 English(EN) · [email protected] ·

    OMG, I wasted entire day and tons of tokens troubleshooting sub-agents on # Codex . It turns out a lot of models can't utilize sub-agents on Codex anymore since

    OMG, I wasted entire day and tons of tokens troubleshooting sub-agents on # Codex . It turns out a lot of models can't utilize sub-agents on Codex anymore since Codex now requires models to emit namespace for subagent related toolcalls. :( Good thing my Pi Agent still works! :) #…

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