Anthropic Claude Code HERMES.md billing flaw

2026-04-27T21:17:56Z

Sherlock: removed nous link

{{IncidentCargo
|Company=Anthropic
|Product=Claude Code
|Date=2026-04-25
|Description=A flaw in Claude Code triggered by the string "HERMES.md" in git commit messages bypassed subscriptions and charged direct API fees.
}}
'''Anthropic Claude Code HERMES.md billing flaw''' was a technical defect in Anthropic's Claude Code product that bypassed flat-rate subscription plans to charge users direct API fees. In April 2026, a flaw triggered by the exact string "HERMES.md" in a user's Git commit history routed subscribers directly to pay-as-you-go billing, charging one account over $200.<ref name="github_hermes">{{Cite web |url=https://github.com/anthropics/claude-code/issues/53262 |title=HERMES.md in git commit messages causes requests to route to extra usage billing instead of plan quota #53262 |author=sasha-id |website=GitHub |date=2026-04-25 |access-date=2026-04-26}}</ref>

== Background ==
The flaw emerged in the context of a wider crackdown by Anthropic on third-party agent harnesses. On April 4, 2026, Anthropic began blocking Claude Pro and Max subscribers from routing their flat-rate plan usage through third-party agentic tools, requiring those tools to be billed under a separate pay-as-you-go "extra usage" tier instead.<ref name="techcrunch_openclaw">{{Cite web |url=https://techcrunch.com/2026/04/04/anthropic-says-claude-code-subscribers-will-need-to-pay-extra-for-openclaw-support/ |title=Anthropic says Claude Code subscribers will need to pay extra for OpenClaw usage |website=TechCrunch |date=2026-04-04 |access-date=2026-04-26}}</ref> Boris Cherny, Anthropic's Head of Claude Code, stated on X that Claude's "subscriptions weren't built for the usage patterns of these third-party tools" and that the policy "applies to all third-party harnesses and will be rolled out to more shortly."<ref name="techcrunch_openclaw" /><ref name="venturebeat_openclaw">{{Cite web |url=https://venturebeat.com/technology/anthropic-cuts-off-the-ability-to-use-claude-subscriptions-with-openclaw-and |title=Anthropic cuts off the ability to use Claude subscriptions with OpenClaw and third-party AI agents |website=VentureBeat |date=2026-04-04 |access-date=2026-04-26}}</ref>

[https://hermes-agent.nousresearch.com/ Hermes Agent], an open-source self-improving AI agent built by Nous Research, is among the third-party harnesses affected by the rollout. Hermes can route requests to Anthropic models either through pay-per-token API keys or by reading Claude Code's credential store on the same machine, the latter of which became the target of Anthropic's enforcement actions.<ref name="hermes_providers">{{Cite web |url=https://hermes-agent.nousresearch.com/docs/integrations/providers |title=AI Providers — Hermes Agent |publisher=Nous Research |access-date=2026-04-26}}</ref>

== HERMES.md billing switch ==
On April 25, 2026, a user reported that the exact string "HERMES.md" in their local git commit history caused Claude Code to route queries outside of their fixed-rate subscription plan.<ref name="github_hermes" /> The system bypassed the $200 per month Max plan and charged the user direct, pay-as-you-go API rates.<ref name="github_hermes" /> The user lost over $200 in extra charges while 86 percent of their prepaid plan capacity remained available.<ref name="github_hermes" />

The string "HERMES.md" appears to have been treated by Claude Code's billing classifier as a signal of third-party harness usage — likely as part of the broader detection logic deployed to enforce the April 4 policy — even when the string appeared only in incidental git history rather than as evidence of an active Hermes session.

=== Anthropic's response ===
When the affected user contacted Anthropic support, the company refused to issue a refund for the $200 lost to the glitch, categorizing the overcharge as an un-refundable technical error.<ref name="reddit_psa">{{Cite web |url=https://www.reddit.com/r/ClaudeAI/comments/1svdm1w/psa_the_string_hermesmd_in_your_git_commit/ |title=PSA: The string 'HERMES.md' in your git commit history silently... |website=Reddit |date=2026-04-26 |access-date=2026-04-26}}</ref>

== References ==
{{reflist}}
[[Category:Anthropic]]
[[Category:Incident]]

Anthropic Claude Code HERMES.md billing flaw

2026-04-27T21:16:56Z

Sherlock: Adds details about Hermes.md and the upstream history of this isuse.

{{IncidentCargo
|Company=Anthropic
|Product=Claude Code
|Date=2026-04-25
|Description=A flaw in Claude Code triggered by the string "HERMES.md" in git commit messages bypassed subscriptions and charged direct API fees.
}}
'''Anthropic Claude Code HERMES.md billing flaw''' was a technical defect in Anthropic's Claude Code product that bypassed flat-rate subscription plans to charge users direct API fees. In April 2026, a flaw triggered by the exact string "HERMES.md" in a user's Git commit history routed subscribers directly to pay-as-you-go billing, charging one account over $200.<ref name="github_hermes">{{Cite web |url=https://github.com/anthropics/claude-code/issues/53262 |title=HERMES.md in git commit messages causes requests to route to extra usage billing instead of plan quota #53262 |author=sasha-id |website=GitHub |date=2026-04-25 |access-date=2026-04-26}}</ref>

== Background ==
The flaw emerged in the context of a wider crackdown by Anthropic on third-party agent harnesses. On April 4, 2026, Anthropic began blocking Claude Pro and Max subscribers from routing their flat-rate plan usage through third-party agentic tools, requiring those tools to be billed under a separate pay-as-you-go "extra usage" tier instead.<ref name="techcrunch_openclaw">{{Cite web |url=https://techcrunch.com/2026/04/04/anthropic-says-claude-code-subscribers-will-need-to-pay-extra-for-openclaw-support/ |title=Anthropic says Claude Code subscribers will need to pay extra for OpenClaw usage |website=TechCrunch |date=2026-04-04 |access-date=2026-04-26}}</ref> Boris Cherny, Anthropic's Head of Claude Code, stated on X that Claude's "subscriptions weren't built for the usage patterns of these third-party tools" and that the policy "applies to all third-party harnesses and will be rolled out to more shortly."<ref name="techcrunch_openclaw" /><ref name="venturebeat_openclaw">{{Cite web |url=https://venturebeat.com/technology/anthropic-cuts-off-the-ability-to-use-claude-subscriptions-with-openclaw-and |title=Anthropic cuts off the ability to use Claude subscriptions with OpenClaw and third-party AI agents |website=VentureBeat |date=2026-04-04 |access-date=2026-04-26}}</ref>

[https://hermes-agent.nousresearch.com/ Hermes Agent], an open-source self-improving AI agent built by [[Nous Research]], is among the third-party harnesses affected by the rollout. Hermes can route requests to Anthropic models either through pay-per-token API keys or by reading Claude Code's credential store on the same machine, the latter of which became the target of Anthropic's enforcement actions.<ref name="hermes_providers">{{Cite web |url=https://hermes-agent.nousresearch.com/docs/integrations/providers |title=AI Providers — Hermes Agent |publisher=Nous Research |access-date=2026-04-26}}</ref>

== HERMES.md billing switch ==
On April 25, 2026, a user reported that the exact string "HERMES.md" in their local git commit history caused Claude Code to route queries outside of their fixed-rate subscription plan.<ref name="github_hermes" /> The system bypassed the $200 per month Max plan and charged the user direct, pay-as-you-go API rates.<ref name="github_hermes" /> The user lost over $200 in extra charges while 86 percent of their prepaid plan capacity remained available.<ref name="github_hermes" />

The string "HERMES.md" appears to have been treated by Claude Code's billing classifier as a signal of third-party harness usage — likely as part of the broader detection logic deployed to enforce the April 4 policy — even when the string appeared only in incidental git history rather than as evidence of an active Hermes session.

=== Anthropic's response ===
When the affected user contacted Anthropic support, the company refused to issue a refund for the $200 lost to the glitch, categorizing the overcharge as an un-refundable technical error.<ref name="reddit_psa">{{Cite web |url=https://www.reddit.com/r/ClaudeAI/comments/1svdm1w/psa_the_string_hermesmd_in_your_git_commit/ |title=PSA: The string 'HERMES.md' in your git commit history silently... |website=Reddit |date=2026-04-26 |access-date=2026-04-26}}</ref>

== References ==
{{reflist}}
[[Category:Anthropic]]
[[Category:Incident]]

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Anthropic Claude Code HERMES.md billing flaw

Anthropic Claude Code HERMES.md billing flaw