Custom Plugins from custom marketplace cause repeated Mantle calls

What version of Codex CLI is running?

v0.136.0-alpha.1 (local build)

What subscription do you have?

Bedrock

Which model were you using?

gpt-5.4

What platform is your computer?

macOS

What terminal emulator and version are you using (if applicable)?

Ghosty

Codex doctor report

{
  "schemaVersion": 1,
  "generatedAt": "1780159361s since unix epoch",
  "overallStatus": "ok",
  "codexVersion": "0.136.0-alpha.1",
  "checks": {
    "app_server.status": {
      "id": "app_server.status",
      "category": "app-server",
      "status": "ok",
      "summary": "background server is not running",
      "details": {
        "control socket": "/Users/juaireaj/.codex/app-server-control/app-server-control.sock",
        "daemon state dir": "/Users/juaireaj/.codex/app-server-daemon",
        "mode": "ephemeral",
        "pid file": "/Users/juaireaj/.codex/app-server-daemon/app-server.pid (missing)",
        "settings": "/Users/juaireaj/.codex/app-server-daemon/settings.json (missing)",
        "status": "not running",
        "update-loop pid file": "/Users/juaireaj/.codex/app-server-daemon/app-server-updater.pid (missing)"
      },
      "remediation": null,
      "durationMs": 0
    },
    "auth.credentials": {
      "id": "auth.credentials",
      "category": "auth",
      "status": "ok",
      "summary": "OpenAI auth is not required for the active model provider",
      "details": {
        "auth file": "/Users/juaireaj/.codex/auth.json",
        "auth storage mode": "File",
        "model provider requires OpenAI auth": "false"
      },
      "remediation": null,
      "durationMs": 0
    },
    "config.load": {
      "id": "config.load",
      "category": "config",
      "status": "ok",
      "summary": "config loaded",
      "details": {
        "CODEX_HOME": "/Users/juaireaj/.codex",
        "config.toml": "/Users/juaireaj/.codex/config.toml",
        "config.toml parse": "ok",
        "cwd": "/Users/juaireaj/Downloads",
        "enabled feature flags": "shell_tool, unified_exec, shell_snapshot, terminal_resize_reflow, sqlite, hooks, enable_request_compression, multi_agent, apps, tool_suggest, plugins, in_app_browser, browser_use, browser_use_external, computer_use, plugin_sharing, image_generation, skill_mcp_dependency_install, steer, guardian_approval, goals, collaboration_modes, tool_call_mcp_elicitation, personality, fast_mode, tui_app_server, workspace_dependencies",
        "feature flag overrides": "none",
        "feature flags enabled": "27",
        "log dir": "/Users/juaireaj/.codex/log",
        "mcp servers": "1",
        "model": "openai.gpt-5.4",
        "model provider": "amazon-bedrock",
        "sqlite home": "/Users/juaireaj/.codex"
      },
      "remediation": null,
      "durationMs": 0
    },
    "git.environment": {
      "id": "git.environment",
      "category": "git",
      "status": "ok",
      "summary": "git version 2.53.0",
      "details": {
        "PATH git #1": "/opt/homebrew/bin/git",
        "PATH git #2": "/usr/bin/git",
        "PATH git entries": "2",
        "git build options": "git version 2.53.0; cpu: arm64; no commit associated with this build; sizeof-long: 8; sizeof-size_t: 8; shell-path: /bin/sh; rust: disabled; feature: fsmonitor--daemon; gettext: enabled; libcurl: 8.7.1; zlib: 1.2.12; SHA-1: SHA1_DC; SHA-256: SHA256_BLK; default-ref-format: files; default-hash: sha1",
        "git exec path": "/opt/homebrew/opt/git/libexec/git-core",
        "git version": "git version 2.53.0",
        "repo detected": "false",
        "selected git": "/opt/homebrew/bin/git"
      },
      "remediation": null,
      "durationMs": 41
    },
    "installation": {
      "id": "installation",
      "category": "install",
      "status": "ok",
      "summary": "installation looks consistent",
      "details": {
        "PATH codex #1": "/Users/juaireaj/.toolbox/bin/codex",
        "PATH codex #2": "/opt/homebrew/bin/codex",
        "PATH codex #3": "/Users/juaireaj/.local/share/mise/shims/codex",
        "PATH codex #4": "/Users/juaireaj/.toolbox/bin/codex",
        "PATH codex entries": "4",
        "current executable": "/Users/juaireaj/.cargo-target/debug/codex",
        "install context": "other",
        "managed by bun": "false",
        "managed by npm": "false",
        "managed package root": "not set"
      },
      "remediation": null,
      "durationMs": 10
    },
    "mcp.config": {
      "id": "mcp.config",
      "category": "mcp",
      "status": "ok",
      "summary": "MCP configuration is locally consistent",
      "details": {
        "configured servers": "1",
        "disabled servers": "0",
        "stdio servers": "1"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.env": {
      "id": "network.env",
      "category": "network",
      "status": "ok",
      "summary": "network-related environment looks readable",
      "details": {
        "proxy env vars": "none"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.provider_reachability": {
      "id": "network.provider_reachability",
      "category": "reachability",
      "status": "ok",
      "summary": "active provider endpoints are reachable over HTTP",
      "details": {
        "amazon-bedrock API base URL": "https://bedrock-mantle.us-east-1.api.aws/openai/<redacted> reachable (HTTP 404)",
        "reachability mode": "provider auth"
      },
      "remediation": null,
      "durationMs": 365
    },
    "network.websocket_reachability": {
      "id": "network.websocket_reachability",
      "category": "websocket",
      "status": "ok",
      "summary": "Responses WebSocket is not enabled for the active provider",
      "details": {
        "model provider": "amazon-bedrock",
        "provider name": "Amazon Bedrock",
        "proxy env vars": "none",
        "supports websockets": "false",
        "wire API": "responses"
      },
      "remediation": null,
      "durationMs": 0
    },
    "runtime.provenance": {
      "id": "runtime.provenance",
      "category": "runtime",
      "status": "ok",
      "summary": "running local build on macos-aarch64",
      "details": {
        "commit": "unknown",
        "current executable": "/Users/juaireaj/.cargo-target/debug/codex",
        "install method": "other",
        "platform": "macos-aarch64",
        "version": "0.136.0-alpha.1"
      },
      "remediation": null,
      "durationMs": 0
    },
    "runtime.search": {
      "id": "runtime.search",
      "category": "search",
      "status": "ok",
      "summary": "search is OK (system)",
      "details": {
        "search command": "rg",
        "search command readiness": "ripgrep 15.1.0",
        "search provider": "system"
      },
      "remediation": null,
      "durationMs": 7
    },
    "sandbox.helpers": {
      "id": "sandbox.helpers",
      "category": "sandbox",
      "status": "ok",
      "summary": "sandbox configuration is readable",
      "details": {
        "approval policy": "OnRequest",
        "codex-linux-sandbox helper": "none",
        "execve wrapper helper": "/Users/juaireaj/.codex/tmp/arg0/codex-arg0Orf8CO/codex-execve-wrapper",
        "filesystem sandbox": "restricted",
        "network sandbox": "restricted"
      },
      "remediation": null,
      "durationMs": 0
    },
    "state.paths": {
      "id": "state.paths",
      "category": "state",
      "status": "ok",
      "summary": "state paths and databases are inspectable",
      "details": {
        "CODEX_HOME": "/Users/juaireaj/.codex (dir)",
        "active rollout files": "90 files, 4892680 total bytes, 54363 average bytes",
        "archived rollout files": "1 files, 60963 total bytes, 60963 average bytes",
        "goals DB": "/Users/juaireaj/.codex/goals_1.sqlite (file)",
        "goals DB integrity": "ok",
        "log DB": "/Users/juaireaj/.codex/logs_2.sqlite (file)",
        "log DB integrity": "ok",
        "log dir": "/Users/juaireaj/.codex/log (missing)",
        "memories DB": "/Users/juaireaj/.codex/memories_1.sqlite (file)",
        "memories DB integrity": "ok",
        "sqlite home": "/Users/juaireaj/.codex (dir)",
        "state DB": "/Users/juaireaj/.codex/state_5.sqlite (file)",
        "state DB integrity": "ok"
      },
      "remediation": null,
      "durationMs": 397
    },
    "state.rollout_db_parity": {
      "id": "state.rollout_db_parity",
      "category": "threads",
      "status": "ok",
      "summary": "rollout files and state DB thread inventory agree",
      "details": {
        "default model provider": "amazon-bedrock",
        "rollout DB active files": "90",
        "rollout DB active rows": "90",
        "rollout DB archive mismatches": "0",
        "rollout DB archived files": "1",
        "rollout DB archived rows": "1",
        "rollout DB duplicate DB paths": "0",
        "rollout DB duplicate rollout thread ids": "0",
        "rollout DB malformed file names": "0",
        "rollout DB missing active rows": "0",
        "rollout DB missing archived rows": "0",
        "rollout DB model providers": "amazon-bedrock=91",
        "rollout DB rows": "91",
        "rollout DB scan cap reached": "false",
        "rollout DB scan errors": "0",
        "rollout DB sources": "cli=85, subagent:other=3, vscode=3",
        "rollout DB stale rows": "0"
      },
      "remediation": null,
      "durationMs": 144
    },
    "system.environment": {
      "id": "system.environment",
      "category": "system",
      "status": "ok",
      "summary": "OS language en-US",
      "details": {
        "LANG": "en_US.UTF-8",
        "os": "Mac OS 15.7.7 [64-bit]",
        "os language": "en-US",
        "os type": "Mac OS",
        "os version": "15.7.7"
      },
      "remediation": null,
      "durationMs": 12
    },
    "terminal.env": {
      "id": "terminal.env",
      "category": "terminal",
      "status": "ok",
      "summary": "terminal metadata was detected",
      "details": {
        "COLORTERM": "truecolor",
        "DISPLAY": "present",
        "TERMINFO": "/Applications/Ghostty.app/Contents/Resources/terminfo (dir)",
        "TERM_PROGRAM": "ghostty",
        "color output": "enabled",
        "effective locale": "en_US.UTF-8",
        "stderr is terminal": "true",
        "stdin is terminal": "true",
        "stdout is terminal": "true",
        "terminal": "Ghostty",
        "terminal size": "131x34",
        "terminal version": "1.3.1"
      },
      "remediation": null,
      "durationMs": 0
    },
    "terminal.title": {
      "id": "terminal.title",
      "category": "title",
      "status": "ok",
      "summary": "terminal title default",
      "details": {
        "terminal title activity": "true",
        "terminal title items": "activity, project-name",
        "terminal title project source": "cwd",
        "terminal title project value": "Downloads",
        "terminal title source": "default"
      },
      "remediation": null,
      "durationMs": 0
    },
    "updates.status": {
      "id": "updates.status",
      "category": "updates",
      "status": "ok",
      "summary": "update configuration is locally consistent",
      "details": {
        "check for update on startup": "false",
        "latest version": "0.135.0",
        "latest version status": "current version is not older",
        "update action": "manual or unknown",
        "version cache": [
          "/Users/juaireaj/.codex/version.json",
          "missing"
        ]
      },
      "remediation": null,
      "durationMs": 175
    }
  }
}

What issue are you seeing?

Seeing Codex respond 5 times to a single message from user.

› hello


• Hello. What do you need help with?

• Hello. What do you need help with?

• Hello. What do you need help with?

• Hello. What do you need help with?

• Hello. What do you need help with?

I believe this has to do with my config:

Full broken config:

model_provider = "amazon-bedrock"
model = "openai.gpt-5.4"
check_for_update_on_startup = false
commit_attribution = ""
forced_login_method = "api"

[model_providers.amazon-bedrock.aws]
region = "us-west-2"
profile = "CodexAmazonInternal"

[mcp_servers.builder-mcp]
args = [
    "--exclude-tools",
    "SkillsTool,WorkspaceSearch,Delegate,ToolReactivationTool",
]
command = "builder-mcp"

[mcp_servers.builder-mcp.env]
TOOL_PERSONALIZATION_ENABLED = "false"
TOOL_PERSONALIZATION_MIN_EXECUTIONS = "0"
TOOL_PERSONALIZATION_ROLLOUT_PERCENTAGE = "100"
TOOL_PERSONALIZATION_TRAINING_DAYS = "0"



[analytics]
enabled = false

[otel]
metrics_exporter = "none"
environment = "stable"


[projects."/Users/juaireaj"]
trust_level = "trusted"

[projects."/Users/juaireaj/vsc-projects/codex"]
trust_level = "trusted"


[projects."/Users/juaireaj/Downloads"]
trust_level = "trusted"

[tui.model_availability_nux]
"openai.gpt-5.5" = 4

[marketplaces.aim]
last_updated = "2026-05-30T16:03:14Z"
source_type = "local"
source = "/Users/juaireaj/.aim/cc-plugins"

[plugins."AmazonBuilderCoreAIAgents-pipeline-assistant@aim"]
enabled = true

[plugins."AmazonBuilderCoreAIAgents-core@aim"]
enabled = false

I believe the problematic section is the follow when either plugin is enabled = true.

[marketplaces.aim]
last_updated = "2026-05-30T16:03:14Z"
source_type = "local"
source = "/Users/juaireaj/.aim/cc-plugins"

[plugins."AmazonBuilderCoreAIAgents-pipeline-assistant@aim"]
enabled = true

[plugins."AmazonBuilderCoreAIAgents-core@aim"]
enabled = false

When flipping either plugin to enabled = false

[marketplaces.aim]
last_updated = "2026-05-30T16:03:14Z"
source_type = "local"
source = "/Users/juaireaj/.aim/cc-plugins"

[plugins."AmazonBuilderCoreAIAgents-pipeline-assistant@aim"]
enabled = false

[plugins."AmazonBuilderCoreAIAgents-core@aim"]
enabled = false

ls -al ~/.aim/cc-plugins
total 0
drwxr-xr-x@  5 juaireaj  staff  160 May 30 09:03 .
drwxr-xr-x@ 15 juaireaj  staff  480 May 12 11:32 ..
drwxr-xr-x@  3 juaireaj  staff   96 May 30 09:03 .claude-plugin
drwxr-xr-x@  4 juaireaj  staff  128 May 30 09:03 AmazonBuilderCoreAIAgents-core
drwxr-xr-x@  7 juaireaj  staff  224 May 30 09:03 AmazonBuilderCoreAIAgents-pipeline-assistant


cat ~/.aim/cc-plugins/.claude-plugin/marketplace.json
{
  "$schema" : "https://anthropic.com/claude-code/marketplace.schema.json",
  "name" : "aim",
  "description" : "AIM-managed Claude Code plugins",
  "owner" : {
    "name" : "AIM",
    "email" : "redacted"
  },
  "plugins" : [ {
    "name" : "AmazonBuilderCoreAIAgents-pipeline-assistant",
    "source" : "./AmazonBuilderCoreAIAgents-pipeline-assistant",
    "version" : "1.0.6463776125"
  }, {
    "name" : "AmazonBuilderCoreAIAgents-core",
    "source" : "./AmazonBuilderCoreAIAgents-core",
    "version" : "1.0.6463776125"
  } ]
}

What steps can reproduce the bug?

Uploaded thread: 019e799d-b322-7dc2-99bf-e8f69dbd275f

What is the expected behavior?

_No response_

Additional information

_No response_

  Here's what we've confirmed:

  Finding: It's a size threshold, not content

  The AGENTS.md file breaks the Codex CLI at ~7004-7005 bytes. The content doesn't matter — pure padding text triggers it too.

  This is almost certainly a bug in the Codex CLI v0.135.0 (or in the Bedrock/Mantle streaming layer) where:

  - The total request payload crosses some internal buffer boundary
  - The SSE stream parser or response handler gets into a re-invoke loop
  - The exact threshold depends on the total context size (base instructions + developer messages + AGENTS.md)

  Workaround

  Keep your ~/.codex/AGENTS.md under ~7000 bytes. Since this is the same content as your project-level AGENTS.md that Codex already loads from the repo, you likely don't need it at the global level at
  all — just remove the symlink.

  For the GitHub Issue

  You should update your issue with this finding: it's not plugins — it's a payload size threshold that causes the turn loop to repeat. Reproducible with any AGENTS.md content exceeding ~7KB when
  combined with the standard Codex base instructions. The model and content are irrelevant; pure padding text triggers it identically.

  Want me to remove the symlink and leave your ~/.codex clean?

  The mantle.rs is just URL/auth configuration — no payload manipulation. The actual request/response happens through the generic SSE/responses layer. Given this is purely size-based and happens at a
  very specific byte threshold, this is almost certainly a bug on the Bedrock Mantle server side, not in the Codex CLI itself.

  Here's my conclusion:

  Root Cause: Bedrock Mantle API returns end_turn: false when input context crosses a size threshold

  The bug is server-side (Bedrock Mantle), not in the Codex CLI. Here's the evidence:

  1. The Codex CLI's turn loop re-invokes correctly — it only re-invokes when end_turn == Some(false) or needs_follow_up is set by tool calls
  2. There are no hooks, no plugins, no token limit issues at ~9K tokens
  3. The trigger is purely byte-size of the AGENTS.md (threshold at ~7003-7005 bytes), regardless of content
  4. The total request payload crosses some boundary that causes the Mantle API to return end_turn: false in the response.completed SSE event

  The fix would need to be on the Bedrock Mantle service. However, you could work around it in the Codex CLI by adding a safeguard in turn.rs at line 2015:

  // Current code:
  if let Some(false) = end_turn {
      needs_follow_up = true;
  }

  // Proposed fix: Don't re-invoke if there were no tool calls and a final message was emitted
  if let Some(false) = end_turn {
      if last_agent_message.is_none() {
          needs_follow_up = true;
      } else {
          // Model said end_turn=false but already emitted a final answer with no
          // tool calls — treat as complete to prevent infinite loops.
          tracing::warn!("end_turn=false with no pending tool calls and existing agent message; treating as turn-complete");
      }
  }